CN218992317U

CN218992317U - Gearbox device

Info

Publication number: CN218992317U
Application number: CN202320199079.XU
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhuoke Cycling Technology Chongqing Co ltd
Current assignee: Zhuoke Cycling Technology Chongqing Co ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-05-09
Anticipated expiration: 2033-02-13

Abstract

The utility model relates to the technical field of transmission systems, in particular to a gearbox device, which comprises a box type speed changing mechanism and a gear shifting control mechanism, wherein the box type speed changing mechanism comprises a box body, a main shaft, a countershaft, a main shaft gear, a countershaft gear and a ratchet wheel; the gear shifting control mechanism comprises an elastic shifting fork mechanism and a gear shifting guide groove drum rod used for driving the elastic shifting fork mechanism to move, and the gear shifting guide groove drum rod is rotatably arranged on the box body. The utility model adopts the rotatable connection of the pulling fork arm and the pulling fork seat, has small friction, more flexible gear entering and releasing and long service life of the elastic piece; and can effectually avoid ratchet and gear to beat tooth, jamming, hard drawing etc. to cause the phenomenon that the ratchet is impaired, effectual elastic component, gear shift operating mechanism and gearbox device's life of having prolonged.

Description

Gearbox device

Technical Field

The utility model relates to the technical field of transmission systems, in particular to a gearbox device.

Background

In a transmission system of a gearbox, a gear shifting control mechanism is needed for shifting in order to realize a mechanism for transmitting change between different gear pairs of the gearbox. The gear shifting fork of most of the existing gear shifting control mechanisms adopts a rigid mechanism, and when the shifting fork drives the ratchet wheel to be meshed with the gear to enter the gear, the hard top of the ratchet wheel and the ratchet teeth on the end face of the gear is easy to generate tooth punching or clamping stagnation; when the ratchet wheel and the gear are out of gear, the ratchet wheel is easy to be damaged due to hard pulling of the ratchet wheel.

The Chinese patent application publication No. CN115195932A discloses a bicycle bottom bracket bearing gearbox with load speed change, wherein a gear shifting control mechanism is disclosed, an elastic notch and an elastic sheet are arranged on a shifting fork, and the elastic performance of the shifting fork is realized by utilizing the repeated rebound deformation force of the elastic sheet. In the use process of the shifting fork structure, the elastic sheet not only needs to have a reciprocating deformation function, but also needs to have a certain connecting and supporting function, so that the elastic sheet is extremely easy to fatigue and lose efficacy in advance, the phenomenon of tooth punching or clamping stagnation of a ratchet wheel and a gear still can be caused, and the service life of a gearbox or the gearbox is short.

Based on the above-mentioned shortcomings of the conventional shift operating mechanism using a rigid shifting fork and an elastic shifting fork, a solution is needed to overcome the above-mentioned technical problems.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a gearbox device, wherein a gear shifting fork is rotatably connected with a shifting fork arm and a shifting fork seat, the friction is small, the gear entering and the gear releasing are more flexible, and the service life of an elastic piece is long; and can effectively avoid the phenomenon that the ratchet is damaged due to tooth punching, clamping stagnation, hard pulling and the like of the ratchet and the gear.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a gearbox device, which comprises a box type speed changing mechanism and a gear shifting control mechanism, wherein the box type speed changing mechanism comprises a box body, a main shaft and a secondary shaft which are arranged in the box body in parallel, at least one main shaft gear is arranged on the main shaft, the secondary shaft is provided with a secondary shaft gear meshed with the main shaft gear, a ratchet wheel meshed with the main shaft gear or/and a ratchet wheel meshed with the secondary shaft gear is arranged on the main shaft in a sliding manner, and the ratchet wheel is in driving connection with the gear shifting control mechanism;

the gear shifting control mechanism comprises an elastic shifting fork mechanism and a gear shifting guide groove drum rod used for driving the elastic shifting fork mechanism to move, and the gear shifting guide groove drum rod is rotatably arranged on the box body;

the elastic shifting fork mechanism comprises a shifting fork seat, a shifting fork arm rotatably connected with the shifting fork seat and an elastic piece used for driving the shifting fork arm to reset, and when the shifting fork arm swings relative to the shifting fork seat, the elastic piece drives the shifting fork arm to reset;

the circumference of the shift guide groove drum stick is provided with a shift guide groove, the upper end of the shifting fork seat is provided with a shifting fork convex column, and the shifting fork convex column is movably arranged in the shift guide groove; the lower end of the shifting fork arm is movably connected with the ratchet wheel.

The box-type speed change mechanism further comprises a tooth disc arranged on the main shaft and cranks arranged at two ends of the main shaft.

The upper part of the shifting fork seat is provided with two sliding guide holes in parallel, the shifting fork seat is sleeved with two guide rods by adopting the sliding guide holes, and the two guide rods are arranged on the box body.

Preferably, the lower part of the shifting fork seat is provided with a mounting groove, the shifting fork arm is provided with a fork arm connecting part, and the fork arm connecting part is mounted in the mounting groove by adopting a fork arm rotating shaft;

the elastic piece is a torsion spring, the spring body of the torsion spring is arranged on the fork arm rotating shaft, and the output end head of the torsion spring clamps the fork arm connecting part and the fork pulling seat.

The fork arm connecting part is provided with a containing groove, the fork arm rotating shaft penetrates through the containing groove, the spring body of the torsion spring is arranged in the containing groove, and the output end stretches out of the containing groove and then clamps the fork pulling seat.

The shifting fork arm is provided with a lower fork part, pile shifting is arranged on the inner sides of two ends of the lower fork part, and the pile shifting is movably arranged in a shifting fork groove on the peripheral surface of the ratchet wheel.

The utility model has the beneficial effects that:

(1) According to the utility model, the shifting fork arm and the shifting fork seat are rotatably connected, and when the shifting fork arm swings relative to the shifting fork seat, the elastic piece always drives the shifting fork arm to reset, so that the shifting fork structure has elasticity. When the elastic shifting fork mechanism drives the ratchet wheel to enter and keep off to be meshed with the main shaft gear or the auxiliary shaft gear, the elastic shifting fork mechanism has a force unloading effect, so that the phenomenon that teeth are punched or blocked due to hard top of the ratchet wheel and the end face ratchet of the main shaft gear or the auxiliary shaft gear can be avoided; when the ratchet wheel is out of gear with the main shaft gear or the auxiliary shaft gear, the ratchet wheel is prevented from being damaged due to hard pulling of the ratchet wheel.

(2) According to the utility model, the pulling fork arm and the pulling fork seat are rotatably connected, and the friction is small when the pulling fork arm swings, so that the ratchet wheel and the main shaft gear or the auxiliary shaft gear can enter and leave gears more flexibly; when the shifting fork arm swings for a small angle relative to the shifting fork seat, larger displacement of the ratchet wheel can be obtained, compared with the shifting fork integral displacement adopted by the existing rigid shifting fork and part of elastic shifting fork, the wear is small, the service life is long, the elastic deformation of the elastic piece is small, the elastic piece is prevented from being invalid in advance, and the service lives of the elastic piece, the elastic shifting fork mechanism and a gearbox device are effectively prolonged.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic perspective view of another view of the present utility model.

Fig. 3 is a schematic perspective view of the hidden case of the present utility model.

Fig. 4 is a schematic perspective view of another view angle of the hidden case according to the present utility model.

Fig. 5 is a schematic structural view of the present utility model from another view after the case is hidden.

Fig. 6 is a schematic perspective view of a gear shift control mechanism according to the present utility model.

Fig. 7 is a schematic perspective view of another view of the gear shift control mechanism according to the present utility model.

Fig. 8 is a schematic perspective view of an elastic fork mechanism according to the present utility model.

Fig. 9 is an exploded view of the elastic fork mechanism according to the present utility model.

Fig. 10 is a schematic perspective view of the elastic fork mechanism of the present utility model after a ratchet is installed.

Fig. 11 is a schematic perspective view of a gear shift control mechanism according to the present utility model.

Detailed Description

The utility model will be further described with reference to examples and drawings, to which reference is made, but which are not intended to limit the scope of the utility model. The present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 11, a transmission device comprises a box-type transmission mechanism and a gear shift control mechanism, wherein the box-type transmission mechanism comprises a box 400, a main shaft 05 and a secondary shaft 06 which are arranged in parallel on the box 400, at least one main shaft gear 07 is arranged on the main shaft 05, a secondary shaft gear 08 meshed with the main shaft gear 07 is arranged on the secondary shaft 06, a ratchet wheel 01 meshed with the main shaft gear 07 is arranged on the main shaft 05 in a sliding manner or/and a ratchet wheel 01 meshed with the secondary shaft gear 08 is arranged on the secondary shaft 06, and the ratchet wheel 01 is in driving connection with the gear shift control mechanism; the gear shifting control mechanism comprises an elastic shifting fork mechanism 5 and a gear shifting guide groove drum stick 6 for driving the elastic shifting fork mechanism 5 to move, and the gear shifting guide groove drum stick 6 is rotatably arranged on the box 400;

the elastic shifting fork mechanism 5 comprises a shifting fork seat 1, a shifting fork arm 3 rotatably connected with the shifting fork seat 1 and an elastic piece 2 used for driving the shifting fork arm 3 to reset, and when the shifting fork arm 3 swings relative to the shifting fork seat 1, the elastic piece 2 drives the shifting fork arm 3 to reset; a gear shifting guide groove 61 is formed in the circumferential surface of the gear shifting guide groove drum stick 6, a shifting fork convex column 13 is arranged at the upper end of the shifting fork seat 1, and the shifting fork convex column 13 is movably arranged in the gear shifting guide groove 61; the lower end of the shifting fork arm 3 is movably connected with the ratchet wheel 01.

Specifically, one or more gear shift guide grooves 61 on the elastic fork mechanism 5 and the gear shift guide groove drum stick 6 may be provided as needed. The number of the main shaft gear 07 and the auxiliary shaft gear 08 can be set according to the requirement, and the main shaft gear 07 and the auxiliary shaft gear 08 can be set in different sizes and series sizes according to the requirement.

In practical application, the shift guide groove drum rod 6 rotates, so that the shift guide groove 61 drives the shifting fork convex column 13 to drive the elastic shifting fork mechanism 5 to move. In the moving process of the elastic shifting fork mechanism 5, when the ratchet teeth of the ratchet wheel 01 collide with the ratchet teeth of the main shaft gear 07 or the auxiliary shaft gear 08, the shifting fork arm 3 swings relative to the shifting fork seat 1, the elastic piece 2 drives the shifting fork arm 3 to drive the ratchet wheel 01 to reset all the time, and the deformation of the elastic piece 2 enables the elastic shifting fork mechanism 5 to have a abdicating effect, so that tooth striking and clamping stagnation during gear entering are avoided; so that the ratchet wheel 01 meshes with the main shaft gear 07 or the counter shaft gear 08 to achieve a gear change.

According to the utility model, the fork pulling arm 3 is rotatably connected with the fork pulling seat 1, and when the fork pulling arm 3 swings relative to the fork pulling seat 1, the elastic piece 2 always drives the fork pulling arm 3 to reset, so that the fork pulling structure has elasticity. When the elastic shifting fork mechanism 5 drives the ratchet wheel 01 to enter and be meshed with the main shaft gear 07 or the auxiliary shaft gear 08, the force is removed, so that the phenomenon that teeth are knocked or stuck due to hard top of the ratchet wheel 01 and the end face ratchet of the main shaft gear 07 or the auxiliary shaft gear 08 can be avoided; when the ratchet wheel 01 is out of gear with the main shaft gear 07 or the auxiliary shaft gear 08, the ratchet wheel is prevented from being damaged by hard pulling of the ratchet wheel 01.

According to the utility model, the fork pulling arm 3 is rotatably connected with the fork pulling seat 1, and the friction is small when the fork pulling arm 3 swings, so that the gear entering and the gear releasing of the ratchet wheel 01 and the main shaft gear 07 or the auxiliary shaft gear 08 are more flexible; when the shifting fork arm 3 swings for a small angle relative to the shifting fork seat 1, larger displacement of the ratchet wheel 01 can be obtained, compared with the shifting fork integral displacement adopted by the existing rigid shifting fork and part of elastic shifting fork, the abrasion is small, the service life is long, the elastic deformation of the elastic piece 2 is small, the elastic piece 2 is prevented from being invalid in advance, and the service lives of the elastic piece 2, the elastic shifting fork mechanism 5 and a gearbox device are effectively prolonged.

In this embodiment, two sliding guide holes 11 are arranged in parallel on the upper portion of the fork base 1, the fork base 1 is sleeved on two guide rods 03 by adopting the sliding guide holes 11, and the two guide rods 03 are mounted on the box 400. When the device works, the fork pulling seat 1 drives the whole elastic shifting fork mechanism and the ratchet wheel 01 to move on the guide rod 03 so as to realize the gear entering and releasing of the ratchet wheel 01 and the main shaft gear 07 or the auxiliary shaft gear 08. Specifically, the sliding guide holes 11 are arranged in parallel, two sliding guide holes 11 are arranged, the shifting fork seat 1 is arranged on the two guide rods 03, and the shifting fork seat 1 and the whole elastic shifting fork mechanism are effectively prevented from shaking and overturning by adopting the double-guide-rod design, so that the gearbox device is stable in structure and reliable in transmission.

In this embodiment, an installation groove 12 is provided at the lower part of the pulling fork seat 1, the pulling fork arm 3 is provided with a fork arm connecting part 31, and the fork arm connecting part 31 is installed in the installation groove 12 by adopting the fork arm rotating shaft 4; the elastic piece 2 is a torsion spring, a spring body 21 of the torsion spring is arranged on the fork arm rotating shaft 4, and an output end 22 of the torsion spring clamps the fork arm connecting part 31 and the fork pulling seat 1. Specifically, the yoke connecting portion 31 is mounted on the yoke rotating shaft 4, two ends of the yoke rotating shaft 4 are mounted on the groove walls on two sides of the mounting groove 12, the yoke connecting portion 31 is accommodated in the mounting groove 12, the structure is compact, and stability is good when the yoke 3 rotates.

In this embodiment, the yoke connecting portion 31 is provided with a receiving slot 311, the yoke shaft 4 penetrates through the receiving slot 311, the spring body 21 of the torsion spring is mounted in the receiving slot 311, and the output end 22 extends out of the receiving slot 311 to clamp the pulling fork seat 1. The spring body 21 of the torsion spring is arranged in the accommodating groove 311, so that the torsion spring is installed and positioned, the structure is stable, the installation is reliable, and the elastic shifting fork mechanism 5 is further compact.

In this embodiment, the fork arm 3 is provided with a lower fork portion 32, and the inner sides of two ends of the lower fork portion 32 are provided with a pile 321, and the pile 321 is movably disposed in a fork slot 011 formed on the peripheral surface of the ratchet wheel 01.

The present utility model is not limited to the preferred embodiments, but is intended to be limited to the following description, and any modifications, equivalent changes and variations in light of the above-described embodiments will be apparent to those skilled in the art without departing from the scope of the present utility model.

Claims

1. The gearbox device comprises a box type speed changing mechanism and a gear shifting control mechanism, wherein the box type speed changing mechanism comprises a box body (400), a main shaft (05) and a countershaft (06) which are arranged in parallel on the box body (400), at least one main shaft gear (07) is arranged on the main shaft (05), a countershaft gear (08) meshed with the main shaft gear (07) is arranged on the countershaft (06), a ratchet wheel (01) meshed with the main shaft gear (07) or/and a ratchet wheel (01) meshed with the countershaft gear (08) is arranged on the main shaft (05) in a sliding mode, and the ratchet wheel (01) is in driving connection with the gear shifting control mechanism; the method is characterized in that:

the gear shifting control mechanism comprises an elastic shifting fork mechanism (5) and a gear shifting guide groove drum stick (6) for driving the elastic shifting fork mechanism (5) to move; the gear shifting guide groove drum stick (6) is rotatably arranged on the box body (400);

the elastic shifting fork mechanism (5) comprises a shifting fork seat (1), a shifting fork arm (3) rotatably connected with the shifting fork seat (1) and an elastic piece (2) for driving the shifting fork arm (3) to reset, and when the shifting fork arm (3) swings relative to the shifting fork seat (1), the elastic piece (2) drives the shifting fork arm (3) to reset;

a gear shifting guide groove (61) is formed in the circumferential surface of the gear shifting guide groove drum stick (6), a shifting fork convex column (13) is arranged at the upper end of the shifting fork seat (1), and the shifting fork convex column (13) is movably arranged in the gear shifting guide groove (61); the lower end of the shifting fork arm (3) is movably connected with the ratchet wheel (01).

2. A transmission arrangement as claimed in claim 1, wherein: the box-type speed change mechanism further comprises a toothed disc (09) arranged on the main shaft (05) and cranks (600) arranged at two ends of the main shaft (05).

3. A transmission arrangement as claimed in claim 1, wherein: the upper portion of shifting fork seat (1) is provided with two slip guiding holes (11) side by side, shifting fork seat (1) adopts slip guiding hole (11) cover is located two guide bars (03), two guide bars (03) are installed in box (400).

4. A transmission arrangement as claimed in claim 1, wherein: the lower part of the shifting fork seat (1) is provided with an installation groove (12), the shifting fork arm (3) is provided with a fork arm connecting part (31), and the fork arm connecting part (31) is installed in the installation groove (12) by adopting a fork arm rotating shaft (4);

the elastic piece (2) is a torsion spring, a spring body (21) of the torsion spring is arranged on the fork arm rotating shaft (4), and an output end (22) of the torsion spring clamps the fork arm connecting part (31) and the fork pulling seat (1).

5. A transmission device as claimed in claim 4, wherein: the fork arm connecting part (31) is provided with a containing groove (311), the fork arm rotating shaft (4) penetrates through the containing groove (311), the spring body (21) of the torsion spring is arranged in the containing groove (311), and the output end (22) stretches out of the containing groove (311) to clamp and pull out the fork seat (1).

6. A transmission device as claimed in claim 4, wherein: the shifting fork arm (3) is provided with a lower fork part (32), shifting piles (321) are arranged on the inner sides of two ends of the lower fork part (32), and the shifting piles (321) are movably arranged in shifting fork grooves (011) formed in the peripheral surface of the ratchet wheel (01).