CN106985963B - Single-wheel drive three-speed transmission - Google Patents

Abstract

The invention discloses a single-wheel drive three-gear speed change device, which comprises: center pin, wheel hub, gearshift and two sets of planetary transmission who sets up side by side, planetary transmission includes: a first planetary transmission and a second planetary transmission, the first planetary transmission comprising: first sun gear, first planet carrier, first planet wheel and first ring gear, second planetary transmission includes: second centre wheel, second planet carrier, second planet wheel and second ring gear, first centre wheel, second centre wheel all overlap locate on the center pin and fixed mutually with the frame, first ring gear and second planet carrier integrated into one piece or fixed connection, center pin and one of them fixed connection in first planet carrier, first ring gear, second planet carrier, the fourth of second ring gear, gearshift includes: ratchet, pawl frame and pawl, form sliding connection between pawl frame and the wheel hub to shift gears stability has been improved greatly.

Description

Single-wheel drive three-speed transmission

【Technical field】

The invention relates to the technical field of bicycles, in particular to a single-wheel drive three-speed speed change device.

【Background technique】

Bicycle derailleurs are divided into two types: inner derailleur and outer derailleur. The outer derailleur adopts an open chain mechanism as the transmission system. By dialing the shifter installed in the front of the bicycle, the chain is changed to different flywheels to achieve different chain transmission ratios. Since the outer transmission is exposed, it is easy to rust and easily interfered by external forces, so regular maintenance is often required. The inner transmission mainly uses a planetary gear mechanism as the main transmission body, which is sealed inside the hub and passes through multiple layers of special sealing materials. Therefore, rainwater, dust, grease, etc. cannot enter, so regular maintenance is not required, and the advantage of maintenance-free is realized.

[Content of the Invention]

In order to solve the above problems, the purpose of the present invention is to provide a single-wheel drive three-speed transmission device with compact structure and good shifting stability.

In order to achieve the above purpose, the technical solution adopted by the present invention is: a single-wheel drive three-speed speed change device, comprising: a central shaft, a wheel hub, a shifting mechanism arranged between the central shaft and the wheel hub, and two sets of planetary transmissions arranged side by side , the planetary transmission includes: a first planetary transmission and a second planetary transmission, the first planetary transmission includes: a first sun wheel, a first planet carrier, a first planetary gear and a first ring gear, the second planetary gear The transmission includes: a second center wheel, a second planet carrier, a second planet wheel and a second ring gear, the first center wheel and the second center wheel are both sleeved on the center shaft and fixed with the frame, the The first ring gear and the second planet carrier are integrally formed or fixedly connected, the central shaft is a power input member, the hub is a power output member, and the central shaft is formed with the first planet carrier, the first ring gear, and the second planet. One of the frame and the second ring gear is fixedly connected, and the shifting mechanism includes: a ratchet, a ratchet member frame, and at least one ratchet member mounted on the ratchet member frame, and the ratchet member frame is on the An elastic member is provided for controlling the initial position of the pawl member, a sliding connection is formed between the pawl member frame and the hub, and the ratchet wheel includes a first ratchet wheel arranged on the first planet carrier, a first ratchet wheel arranged on the first ring gear or The second ratchet on the second planet carrier and the third ratchet on the second ring gear.

Preferably, a single-wheel drive third-speed transmission device in the present invention is further configured as follows: one end of the central shaft is provided with a first end cover and a parallel tightening nut, and the first end cover and the parallel tightening nut pass through Bearing or ball connection, the first end cover and the hub are connected by bearings or balls, the other end of the central shaft is provided with a second end cover and a boss, and the second end cover and the boss are connected by Bearings or balls are connected, and the second end cover is connected with the wheel hub through bearings or balls.

Preferably, a single-wheel drive third-speed transmission device in the present invention is further configured as follows: the first center wheel and the second center wheel are integrally formed to form a center wheel assembly, the center wheel assembly and the first end The cover is fixedly connected, and the first end cover is fixedly connected with the frame.

Preferably, a single-wheel drive third-speed speed change device in the present invention is further configured as follows: a guide sleeve is installed on the center wheel assembly, and the guide sleeve can move axially relative to the center wheel assembly.

Preferably, a single-wheel drive three-speed speed change device in the present invention is further configured as follows: the guide sleeve is provided with a groove, and the pawl frame is provided with a convex portion accommodated in the groove.

Preferably, a single-wheel drive third-speed speed change device in the present invention is further configured as follows: a return spring is provided between the guide sleeve and the first end cover.

Preferably, a single-wheel drive third-speed transmission device in the present invention is further configured as follows: the pawl member frame is arranged in an annular shape, the ratchet member frame is provided with several openings, and the ratchet member accommodates in the opening and mounted on the pawl frame by a pin.

Preferably, a single-wheel drive three-speed transmission device in the present invention is further configured as follows: the elastic member is a spring, a torsion spring or an elastic sheet.

Preferably, a single-wheel drive third-speed transmission device in the present invention is further configured as follows: the pawl member is provided with a pawl portion matched with the ratchet wheel, and the pawl portion is provided with an engaging guide surface.

Compared with the prior art, the present invention has the following beneficial effects: the single-wheel drive three-speed gear shifting device of the present invention adopts the pawl-type shifting mechanism, which is not only compact in structure, convenient in shifting manipulation, but also greatly improved in shifting stability, In addition, the pawl-type shifting mechanism in the present invention can also be used as an overrunning clutch without using an overrunning clutch in the planetary transmission, thus greatly simplifying the structure.

[Description of drawings]

FIG. 1 is a schematic front view of the structure of the single-wheel drive three-speed transmission device of the present invention.

FIG. 2 is a schematic cross-sectional structural diagram of the single-wheel drive three-speed transmission device of the present invention.

FIG. 3 is a schematic diagram of the exploded structure of the single-wheel drive three-speed transmission according to the present invention.

In the figure: 1. Center shaft, 10, First end cover, 11, Tightening nut, 12, Second end cover, 13, Boss, 2, Wheel hub, 3, Gear shift mechanism, 30, Pawl frame, 300, spring, 301, convex portion, 31, pawl member, 310, pawl portion, 32, first ratchet, 33, second ratchet, 34, third ratchet, 4, first planetary transmission, 40, first sun gear, 41, first planet carrier, 42, first planet gear, 43, first ring gear, 5, second planetary transmission, 50, second sun gear, 51, second planet carrier, 52, second planet wheel, 53, second ring gear, 6, guide sleeve, 60, groove.

【Detailed ways】

A single-wheel drive three-speed transmission device according to the present invention will be further described in detail below through specific embodiments.

Referring to Figures 1 to 3, a single-wheel drive three-speed transmission device includes: a central shaft 1, a hub 2, a shifting mechanism 3 arranged between the central shaft 1 and the hub 2, and two sets of planets arranged side by side For the transmission (the first planetary transmission 4 and the second planetary transmission 5), one end of the central shaft 1 is provided with a first end cover 10 and a parallel nut 11, and the first end cover 10 and the parallel nut 11 pass through Bearing or ball connection, the first end cover 10 and the hub 2 are connected by a bearing or a ball, the other end of the central shaft 1 is provided with a second end cover 12 and a boss 13, the second end cover 12 The second end cover 12 is connected with the hub 2 through bearings or balls.

The first planetary transmission 4 includes: a first sun wheel 40 , a first planet carrier 41 , a first planetary wheel 42 and a first ring gear 43 , and the second planetary transmission 5 includes a second sun wheel 50 , a second The planet carrier 51 , the second planetary gear 52 and the second ring gear 53 are integrally formed with the first ring gear 43 and the second planet carrier 51 . In this embodiment, the first center wheel 40 and the second center wheel 50 are integrally formed to form a center wheel assembly, the center wheel assembly is sleeved on the center shaft 1 and is fixedly connected with the first end cover 10 , The first end cover 10 is fixed to the vehicle frame. Of course, in other embodiments, the center wheel assembly can also be directly fixedly connected to the vehicle frame. In this embodiment, the central shaft 1 is fixedly connected to the first planet carrier 41 . Of course, in other embodiments, the central shaft 1 may also be connected to the first ring gear 43 or the second planet carrier 51 or the second planetary carrier 41 . The ring gear 53 is fixedly connected.

The shifting mechanism 3 includes a ratchet member frame 30, three ratchet members 31 mounted on the ratchet member frame 30, a first ratchet wheel 32 arranged on the outer circumferential surface of the first planet carrier 41, The second ratchet wheel 33 on the outer circumferential surface of the ring gear 43 or the second planet carrier 51 and the third ratchet wheel 34 on the outer circumferential surface of the second ring gear 53 are provided. The ratchet member frame 30 is provided with three openings, and the ratchet member 31 is accommodated in the openings and mounted on the ratchet member frame 30 through pins. The pawl member 31 is provided with a pawl portion 310, and the pawl portion 310 is provided with a meshing guide surface (not shown), the meshing guide surface plays a guiding role when the pawl portion is engaged with the ratchet wheel, This makes shifting more stable. The ratchet member frame 30 is provided with an elastic member for controlling the initial position of the ratchet member 31. In this embodiment, the elastic member is a spring 300. Of course, in other embodiments, the elastic member may also be It is other elastic parts such as torsion springs or elastic sheets. The ratchet member frame 30 can slide back and forth relative to the hub 2 . In this embodiment, the hub 2 is provided with internal splines, and the ratchet member frame 30 is provided with internal splines in the hub 2 . The matching external splines, of course, other sliding connection methods can also be used in other embodiments, and the present invention can also be realized. A guide sleeve 6 is provided on it, a return spring (not shown) is arranged between the guide sleeve 6 and the first end cover 10, an inner tooth is arranged in the guide sleeve 6, and an inner tooth is arranged on the center wheel assembly. The matching external teeth, so that the guide sleeve 6 can move axially relative to the center wheel assembly. A groove 60 is provided on the outer circumferential surface of the guide sleeve 6, and the pawl frame 30 is accommodated in the groove 60. The inner convex part 301, so that the pawl frame 30 can use the force of the central shaft 1 through the guide sleeve 6 during the axial movement.

The working principle of the single-wheel drive three-speed speed change device in the present invention is as follows: in the present invention, the central shaft 1 is the power input member, and the hub 2 is the power output member. When the gear is low, the pawl member 31 is controlled by the spring to connect with the first ratchet wheel. 32 are engaged, and the power is input by the central shaft 1. Since the central shaft 1 is fixedly connected with the first planet carrier 41, the first planet carrier 41 rotates synchronously. Since the first ratchet 32 is arranged on the first planet carrier 41, the first ratchet 32 engages with the ratchet member 31, and the ratchet member 31 is arranged on the ratchet member frame 30, so the ratchet member frame 30 rotates synchronously. The power is finally transmitted to the hub 2 and the hub 2 performs power output. In the middle speed gear, manually move the pawl member frame 30, so that the pawl member 31 on the pawl member frame 30 is disengaged from the first ratchet wheel 32 and engaged with the second ratchet wheel 33, and the power is input from the central shaft 1. The central shaft 1 is fixedly connected with the first planetary carrier 41, the first planetary carrier 41 rotates synchronously, and the first planetary carrier 41 transmits the power to the first ring gear 43 through the transmission of the first planetary gear 42. On the first ring gear 43, the second ratchet 33 meshes with the pawl member 31, and the pawl member 31 is arranged on the pawl member frame 30, so the ratchet member frame 30 rotates synchronously. The hubs 2 are connected by splines, so the power is finally transmitted to the hub 2 and the hub 2 performs power output. When the gear is high, manually move the pawl frame 30 to disengage the ratchet member 31 on the pawl frame 30 from the second ratchet 33 and engage with the third ratchet 34. The power is input from the central shaft 1. The shaft 1 is fixedly connected with the first planetary carrier 41, so the first planetary carrier 41 rotates synchronously, and the first planetary carrier 41 transmits the power to the first ring gear 43 through the transmission of the first planetary gear 42. The second planetary carrier 51 is integrally formed, so the second planetary carrier 51 rotates synchronously, and the second planetary carrier 51 transmits the power to the second ring gear 53 through the transmission of the second planetary gear 52. Since the third ratchet 34 is arranged on the second gear On the ring 53, the third ratchet wheel 34 is engaged with the pawl member 31, and the pawl member 31 is arranged on the pawl member frame 30, so the ratchet member frame 30 rotates synchronously. They are connected by splines, so the power is finally transmitted to the hub 2 and the hub 2 performs power output.

To sum up, the single-wheel drive three-speed transmission device of the present invention not only has a compact structure, but also facilitates the shifting control and greatly improves the shifting stability. In addition, the pawl-type shifting mechanism in the present invention can also be used as an overrunning clutch. It can be used without using an overrunning clutch in the planetary transmission, thus greatly simplifying the structure.

The above-mentioned embodiments are only illustrative of the principles and effects of the present invention, as well as some applied embodiments, but are not intended to limit the present invention; it should be pointed out that for those of ordinary skill in the art, without departing from the present invention Under the premise of creating ideas, several modifications and improvements can also be made, which all belong to the protection scope of the present invention.

Claims (9)

1. A single-wheel drive three-speed speed change device is characterized in that, comprising: a central shaft, a wheel hub and a shifting mechanism arranged between the central shaft and the wheel hub and two sets of planetary transmissions arranged side by side, the planetary transmission comprises: A first planetary transmission and a second planetary transmission, the first planetary transmission includes: a first sun gear, a first planet carrier, a first planetary gear and a first ring gear, the second planetary transmission includes: a second sun gear , the second planet carrier, the second planet wheel and the second ring gear, the first center wheel and the second center wheel are all sleeved on the central shaft and fixed with the frame, the first ring gear and the second The planet carrier is integrally formed or fixedly connected, the central shaft is a power input member, the hub is a power output member, and the central shaft is connected to the first planet carrier, the first ring gear, the second planet carrier, and the second ring gear. One of the two is fixedly connected, and the shifting mechanism includes: a ratchet, a pawl frame and at least one ratchet member mounted on the ratchet frame, and the ratchet frame is provided with a ratchet member for controlling the ratchet member. The elastic member in the initial position forms a sliding connection between the ratchet member frame and the hub, and the ratchet wheel includes a first ratchet wheel arranged on the first planet carrier, a first ratchet wheel arranged on the first ring gear or the second planet carrier. Two ratchet wheels and a third ratchet wheel arranged on the second ring gear. 2 . The single-wheel drive three-speed transmission device according to claim 1 , wherein one end of the central shaft is provided with a first end cover and a parallel tightening nut, and the first end cover and the parallel tightening nut are provided. 3 . They are connected by bearings or balls, the first end cover and the hub are connected by bearings or balls, the other end of the central shaft is provided with a second end cover and a boss, the second end cover and the boss are connected The second end cover and the wheel hub are connected by bearings or balls. 3 . The single-wheel drive three-speed speed change device according to claim 2 , wherein the first center wheel and the second center wheel are integrally formed to form a center wheel assembly, and the center wheel assembly is connected with 3 . The first end cover is fixedly connected, and the first end cover is fixedly connected with the frame. 4 . The single-wheel drive three-speed speed change device according to claim 3 , wherein a guide sleeve is installed on the center wheel assembly, and the guide sleeve can move axially relative to the center wheel assembly. 5 . . 5 . The single-wheel drive three-speed speed change device according to claim 4 , wherein the guide sleeve is provided with a groove, and the pawl frame is provided with a convex portion accommodated in the groove. 6 . . 6 . The single-wheel drive three-speed transmission device according to claim 4 , wherein a return spring is provided between the guide sleeve and the first end cover. 7 . 7 . The single-wheel drive three-speed speed change device according to claim 1 , wherein the ratchet member frame is arranged in an annular shape, the ratchet member frame is provided with a plurality of openings, and the ratchet member frame is provided with a plurality of openings. 8 . The pawl is accommodated in the opening and is mounted on the pawl frame through a pin. 8 . The single-wheel drive three-speed speed change device according to claim 1 , wherein the elastic member is a spring, a torsion spring or a shrapnel. 9 . 9 . The single-wheel drive three-speed speed change device according to claim 1 , wherein the pawl part is provided with a pawl part matched with the ratchet wheel, and the pawl part is provided with a meshing guide. 10 . noodle.

Images