CN214875385U

CN214875385U - Reverse gear device

Info

Publication number: CN214875385U
Application number: CN202121918696.8U
Authority: CN
Inventors: 高翔; 李冯鑫; 胡伟; 黄儒明; 陈乔伟
Original assignee: Chongqing Chuanyu Jinggong Machinery Parts Development Co ltd
Current assignee: Chongqing Chuanyu Jinggong Machinery Parts Development Co ltd
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2021-11-26
Anticipated expiration: 2031-08-16

Abstract

The utility model provides a reverse gear device, which relates to the technical field of vehicles and comprises a shell, a spline shaft, a forward gear bevel gear, a reverse gear bevel gear, an input gear, a combination gear, a shifting fork and a locking pin; the part of the spline shaft, which is positioned in the shell, is also provided with a first bearing and a second bearing which is matched according to the stress, the first bearing is arranged on one side of the reverse bevel gear, which is far away from the combined gear, and the second bearing is arranged on one side of the forward bevel gear, which is far away from the combined gear; and a shaft retaining ring and a hole retaining ring which limit the axial movement of the spline shaft are arranged in the shell and on one side of the output end of the spline shaft. It has solved the axial force that exists among the prior art and has leaded to the damaged and increase bearing of reverse gear shell to lead to the problem of reverse gear overall structure grow easily.

Description

Reverse gear device

Technical Field

The utility model relates to the technical field of vehicles, especially, relate to a reverse gear.

Background

The reverse gear device is a device used for realizing forward or backward movement of vehicles such as motor tricycles and the like, and comprises an input gear, a forward bevel gear, a reverse bevel gear, a combination gear, a spline shaft and a shifting fork. Shifting the shifting fork to enable the motor tricycle to move forwards when the combination gear is meshed with the forward gear bevel gear; when the combination gear is meshed with the reverse bevel gear, the motor tricycle moves backwards. In the prior art, three bearings are arranged, wherein two bearings are arranged in the direction of the output end of the spline shaft, and one side of the reverse bevel gear is provided with one bearing. One bearing in the output end direction of the spline shaft is matched with a bearing at one side of the reverse bevel gear and used for supporting and fixing the transmission of the spline shaft; the remaining one bearing alone performs cantilever support and fixes the drive of the forward bevel gear. During transmission in the prior art, the spline shaft can move left and right due to axial force, and the movement force can directly act on a bearing on one side of the reverse bevel gear. Along with the continuous increase of engine displacement, with the restriction of engine installation space, the bearing specification and the box size of the side close to the reverse bevel gear can not be further increased, thereby causing bearing damage and shell fracture. Similarly, the increase of the engine displacement will increase all the axial and radial forces of the cantilever support bearing, and if the cantilever support bearing is subjected to a larger force, the cantilever support bearing needs to be supported by a larger bearing, but the overall structure of the reverse gear is increased, so that a larger space needs to be reserved for installing the reverse gear.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model provides a reverse gear, its axial force that has solved to exist among the prior art leads to the damaged problem that can lead to reverse gear overall structure grow with the increase bearing of reverse gear shell easily.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a reverse gear device comprises a shell, a spline shaft, a forward bevel gear, a reverse bevel gear, an input gear, a combination gear, a shifting fork and a locking pin;

one end of the spline shaft is positioned in the shell, the other end of the spline shaft extends out of the shell, the forward bevel gear and the reverse bevel gear are sleeved on the part of the spline shaft positioned in the shell in a free mode and are meshed with the input gear, the combination gear is connected to the spline shaft in a spline mode and is positioned between the forward bevel gear and the reverse bevel gear, one end of the shifting fork is connected to the shell in a rotating mode, the other end of the shifting fork is provided with a shifting part matched with the combination gear so as to drive the combination gear to be alternatively matched with the forward bevel gear or the reverse bevel gear, one side of the shifting fork is provided with a positioning groove, the locking pin is arranged on the shell, a pressure spring is arranged in the locking pin, and the locking pin is pressed on the positioning groove through the pressure spring;

the part of the spline shaft, which is positioned in the shell, is also provided with a first bearing and a second bearing which is matched according to the stress, the first bearing is arranged on one side of the reverse bevel gear, which is far away from the combined gear, and the second bearing is arranged on one side of the forward bevel gear, which is far away from the combined gear;

and a shaft retaining ring and a hole retaining ring which limit the axial movement of the spline shaft are arranged in the shell and on one side of the output end of the spline shaft.

Compared with the prior art, the utility model discloses following beneficial effect has:

the two bearings arranged at one end of the front gear bevel gear are replaced by one large second bearing, so that the spline shaft can be supported, and the structure is compact; the bearing can be installed in the original installation space condition to bear larger axial force, and the second bearing can be replaced within the range of the original installation space according to the input power of the engine; the spline shaft is limited by the shaft retainer ring and the hole retainer ring, so that the spline shaft can bear larger axial force, and the spline shaft is prevented from being axially moved by the axial force to cause the damage to the shell of the reverse gear device and the internal structure of the reverse gear device; the internal structure of the reverse gear device is improved, so that the reverse gear device can bear larger axial force, the possibility of safety accidents is reduced, the performance is improved while the size of the reverse gear device is not changed, the reverse gear device can be matched with engines with more specifications, and diversified requirements are met.

Preferably, a step is fixedly arranged on the spline shaft, the step is positioned between the second bearing and the forward bevel gear, the shaft retainer ring is arranged on the spline shaft and positioned on one side of the second bearing, which is far away from the forward bevel gear, two sides of the shaft retainer ring are respectively abutted against the second bearing and the shell, the hole retainer ring is arranged on the shell and positioned between the second bearing and the forward bevel gear, and two sides of the hole retainer ring are respectively abutted against the second bearing and the shell.

Preferably, be equipped with the pivot of shifting on the casing, the axis of the pivot of shifting and the projection of integral key shaft on same horizontal plane are perpendicular mutually, the shift fork includes the shift fork body and shifting block, shift fork body splined connection is in the pivot of shifting, shift fork body one end is equipped with the cylinder section, and cylinder section and the coaxial setting of shift fork body, round hole clearance fit that the shifting block was equipped with through it on the cylinder section, shift fork body lower part are equipped with the fork oral area, and the shifting block lower part is equipped with fork oral area complex boss portion, the constant head tank is including setting up two locking grooves in the radial side of shift fork body and setting up two fender position grooves in the radial side of shifting block, and locking groove and fender position groove correspond the setting, locking round pin front end be equipped with respectively with locking groove, fender position groove complex locking tooth and fender position tooth.

Preferably, the locking groove is a V-shaped groove, and the stop groove is a rectangular groove.

Preferably, the locking pin is connected to the casing in a sliding manner along the horizontal direction, a rectangular sliding groove extending along the axial direction of the locking pin is formed in the outer circle of the locking pin, and an anti-rotation cylindrical pin is arranged on the casing and can slide in the rectangular sliding groove.

Preferably, one end of the gear shifting rotating shaft extends outwards and is provided with a gear shifting pedal.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the embodiment of the present invention.

Fig. 2 is the utility model discloses shift fork and the pivot connection schematic diagram of shifting.

Fig. 3 is a schematic view of a structure of a fork body according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a shifting block according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a locking pin according to an embodiment of the present invention.

Fig. 6 is a schematic view of the fork and the locking pin according to an embodiment of the present invention.

In the above drawings: 1. a housing; 2. a spline shaft; 3. a forward gear bevel gear; 4. a reverse bevel gear; 5. a coupling gear; 6. a shifting fork; 61. a fork body; 611. a cylindrical section; 612. a fork opening part; 613. a locking groove; 62. shifting blocks; 621. a circular hole; 622. a boss portion; 623. a stop groove; 7. a locking pin; 71. a locking tooth; 72. gear teeth; 73. a rectangular chute; 8. a pressure spring; 9. a first bearing; 10. a second bearing; 11. a retainer ring for a shaft; 12. a retainer ring for a bore; 13. a shift shaft; 14. an anti-rotation cylindrical pin; 15. a gear shifting foot pedal.

Detailed Description

In order to make the technical means, creation features, achievement purposes and actions of the present invention clearer and easier to understand, the following technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1, an embodiment of the present invention provides a reverse gear device, including a housing 1, a spline shaft 2, a forward bevel gear 3, a reverse bevel gear 4, an input gear, a coupling gear 5, a shift fork 6, and a lock pin 7; one end of the spline shaft 2 is positioned in the shell 1, the other end of the spline shaft extends out of the shell 1, the forward bevel gear 3 and the reverse bevel gear 4 are both sleeved on the part of the spline shaft 2 positioned in the shell 1 in a free mode and are meshed with the input gear, the combination gear 5 is connected to the spline shaft 2 in a spline mode and is positioned between the forward bevel gear 3 and the reverse bevel gear 4, one end of the shifting fork 6 is rotatably connected to the shell 1, the other end of the shifting fork is provided with a shifting part matched with the combination gear 5 so as to drive the combination gear 5 to be alternatively matched with the forward bevel gear 3 or the reverse bevel gear 4, one side of the shifting fork 6 is provided with a positioning groove, the locking pin 7 is arranged on the shell 1, a pressure spring 8 is arranged in the locking pin 7, and the locking pin 7 is pressed on the positioning groove through the pressure spring 8; the part of the spline shaft 2 in the shell 1 is also provided with a first bearing 9 and a second bearing 10 adapted according to the stress, the first bearing 9 is arranged on one side of the reverse bevel gear 4 far away from the combined gear 5, and the second bearing 10 is arranged on one side of the forward bevel gear 3 far away from the combined gear 5; and a shaft retainer ring 11 and a hole retainer ring 12 for limiting the axial movement of the spline shaft 2 are arranged in the shell 1 and on one side of the output end of the spline shaft 2.

The input gear provides power input for the forward bevel gear 3 and the reverse bevel gear 4, two ends of the combination gear 5 are respectively provided with teeth which can be combined with the forward bevel gear 3 and the reverse bevel gear 4, when the reverse gear device works, the shifting fork 6 is shifted, so that when the combination gear 5 is combined with one of the forward bevel gear 3 and the reverse bevel gear 4, for example, when the combination gear is combined with the forward bevel gear 3, the forward bevel gear 3 outputs power, the reverse bevel gear 4 idles, and in the state, the locking pin 7 is matched with the shifting fork 6 to lock under the action of the pressure spring 8. Compared with a common reverse gear device, the device has the advantages that the first bearing 9 and the second bearing 10 are arranged in the shell 1 and used for supporting the spline shaft 2, so that the stability of the spline shaft 2 is improved, and the device is compact in structure because one second bearing 10 is used for replacing two bearings arranged at one end, provided with the forward gear bevel gear 3, of the prior art; meanwhile, a larger bearing can be installed under the condition of the original installation space so as to bear larger axial force, the second bearing 10 can be replaced within the range of the original installation space according to the input power of the engine so as to take cost into consideration and reduce waste, for example, when the input power of the engine is increased, the 6305 bearing is used for replacing the 6205 bearing which is originally used; the spline shaft 2 is limited by the shaft retainer ring 11 and the hole retainer ring 12, so that the spline shaft 2 is prevented from being damaged by the reverse gear shell and the internal structure thereof due to axial movement caused by axial force, and the shaft retainer ring 11 and the hole retainer ring 12 can be thickened so as to better bear larger axial force; the internal structure of the reverse gear device is improved, so that the reverse gear device can bear larger axial force, the possibility of safety accidents is reduced, the performance is improved while the size of the reverse gear device is not changed, the reverse gear device can be matched with engines with more specifications, and diversified requirements are met.

As shown in fig. 1, a shaft retaining ring 11 and a hole retaining ring 12 are specifically provided, the shaft retaining ring 11 is provided on the spline shaft 2 and located on one side of the second bearing 10 away from the forward bevel gear 3, both sides of the shaft retaining ring 11 are respectively abutted against the second bearing 10 and the housing 1, the hole retaining ring 12 is provided on the housing 1 and located between the second bearing 10 and the forward bevel gear 3, and both sides of the hole retaining ring 12 are respectively abutted against the second bearing 10 and the housing 1. The spline shaft 2 is fixedly provided with a step which is positioned between the second bearing 10 and the forward gear bevel gear 3. When the spline shaft 2 is subjected to axial force and the spline shaft 2 moves towards one end of the second bearing 10, the force acts on the second bearing 10 through the step, and the second bearing 10 acts on the shell 1; when the spline shaft 2 moves towards the direction of one end of the first bearing 9, force acts on the second bearing 10 through the shaft check ring 11, the second bearing 10 acts on the hole check ring 12, the shaft check ring 11 and the hole check ring 12 limit the spline shaft 2 to move towards the direction of one end of the first bearing 9, the spline shaft 2 is enabled to be always kept at a relative position with the shell 1, axial movement of the spline shaft 2 is avoided, the shell 1 and the inner structure of the shell are prevented from being punctured by the spline shaft 2, and safety accidents are caused due to failure of the reverse gear.

As shown in fig. 1 to 6, a shift spindle 13 is provided on the housing 1, the projections of the axis of the shift spindle 13 and the axis of the spline shaft 2 on the same horizontal plane are perpendicular to each other, the shifting fork 6 comprises a shifting fork body 61 and a shifting block 62, the shifting fork body 61 is connected on the shifting rotating shaft 13 through a spline, one end of the shifting fork body 61 is provided with a cylindrical section 611, the cylindrical section 611 and the shifting fork body 61 are coaxially arranged, the shifting block 62 is in clearance fit with the cylindrical section 611 through a round hole 621 arranged on the shifting fork body, the lower part of the shifting fork body 61 is provided with a fork opening part 612, the lower part of the shifting block 62 is provided with a boss part 622 matched with the fork opening part 612, the positioning groove comprises two locking grooves 613 arranged at the radial side of the shifting fork body 61 and two stop grooves 623 arranged at the radial side of the shifting block 62, the locking grooves 613 and the stop grooves 623 are correspondingly arranged, the front end of the locking pin 7 is provided with a locking tooth 71 and a gear tooth 72 which are respectively matched with the locking groove 613 and the gear groove 623. One end of the gear shifting rotating shaft 13 extends outwards and is provided with a gear shifting foot pedal 15. During gear shifting, the gear shifting rotating shaft 13 is rotated, the shifting fork body 61 rotates along with the gear shifting rotating shaft, the fork opening part 612 is matched with the boss part 622, the shifting block 62 rotates along with the shifting fork body 61, the locking pin 7 retreats backwards by overcoming the pressure of the pressure spring 8, the locking teeth 71 and the gear teeth 72 are not meshed with the locking grooves 613 and the gear grooves 623 on the shifting fork body 61 and the shifting block 62, so that the shifting combination gear 5 moves along the length direction of the spline shaft 2 to be matched with the forward bevel gear 3 or the reverse bevel gear 4, after shifting is finished, the locking pin 7 moves under the action of the pressure spring 8, the locking teeth 71 and the gear teeth 72 are respectively meshed with the other locking grooves 613 and the gear grooves 623, and the state of the shifting fork 6 at the moment is locked. During gear shifting, the locking teeth 71 on the lock pin 7 mainly function as gear positioning, and the gear teeth 72 on the lock pin 7 are inserted into the gear groove 623 again to lock the gear.

As shown in fig. 2 to 4, the locking groove 613 is a "V" shaped groove, and the catching groove 623 is a rectangular groove. The inclined surface of the V-shaped locking groove 613 can guide the insertion of the locking tooth 71, so that the locking tooth 71 can be smoothly inserted into the locking groove 613 without collision, the gear tooth 72 is engaged with the gear groove 623, the straight wall of the rectangular gear groove 623 can prevent the gear tooth 72 from slipping out, and the locking of the gear tooth 72 is more stable and reliable.

As shown in fig. 1 and 5, the locking pin 7 is slidably connected to the housing 1 in the horizontal direction, a rectangular sliding groove 73 extending in the axial direction of the locking pin 7 is formed in the outer circle of the locking pin 7, and the anti-rotation cylindrical pin 14 is arranged on the housing 1, and the anti-rotation cylindrical pin 14 can slide in the rectangular sliding groove 73. The anti-rotation cylindrical pin 14 in the rectangular sliding groove 73 in the locking pin 7 enables the locking pin 7 to only horizontally slide, the locking pin 7 cannot rotate along with the rotation of the shifting fork 6, the locking pin 7 and the shifting fork 6 are prevented from being locked, potential safety hazards caused by locking are eliminated, and the use safety of a user is guaranteed.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A reverse gear device is characterized in that: the bevel gear transmission mechanism comprises a shell (1), a spline shaft (2), a forward gear bevel gear (3), a reverse gear bevel gear (4), an input gear, a combination gear (5), a shifting fork (6) and a locking pin (7);

one end of the spline shaft (2) is positioned in the shell (1), the other end extends out of the shell (1), the forward bevel gear (3) and the reverse bevel gear (4) are sleeved on the part of the spline shaft (2) in the shell (1) in a non-clearance mode and are meshed with the input gear, the combination gear (5) is connected to the spline shaft (2) in a spline mode and is located between the forward bevel gear (3) and the reverse bevel gear (4), one end of the shifting fork (6) is rotatably connected to the shell (1), the other end of the shifting fork is provided with a shifting part matched with the combination gear (5), the combination gear (5) is driven to be alternatively matched with the forward gear bevel gear (3) or the reverse gear bevel gear (4), a positioning groove is formed in one side of a shifting fork (6), a locking pin (7) is arranged on the shell (1), a pressure spring (8) is arranged in the locking pin (7), and the locking pin (7) is pressed on the positioning groove through the pressure spring (8);

the part of the spline shaft (2) in the shell (1) is also provided with a first bearing (9) and a second bearing (10) which is adaptive according to the stress, the first bearing (9) is arranged on one side of the reverse bevel gear (4) far away from the combined gear (5), and the second bearing (10) is arranged on one side of the forward bevel gear (3) far away from the combined gear (5);

and a shaft retainer ring (11) and a hole retainer ring (12) which limit the axial movement of the spline shaft (2) are arranged in the shell (1) and on one side of the output end of the spline shaft (2).

2. A reverse gear as claimed in claim 1, wherein: the spline shaft (2) is fixedly provided with a step, the step is located between the second bearing (10) and the forward bevel gear (3), the shaft retainer ring (11) is arranged on the spline shaft (2) and located on one side, far away from the forward bevel gear (3), of the second bearing (10), two sides of the shaft retainer ring (11) are respectively abutted against the second bearing (10) and the shell (1), the hole retainer ring (12) is arranged on the shell (1) and located between the second bearing (10) and the forward bevel gear (3), and two sides of the hole retainer ring (12) are respectively abutted against the second bearing (10) and the shell (1).

3. A reverse gear as claimed in claim 1, wherein: the gear shifting mechanism is characterized in that a gear shifting rotating shaft (13) is arranged on the shell (1), the axis of the gear shifting rotating shaft (13) and the projection of the axis of the spline shaft (2) on the same horizontal plane are perpendicular to each other, the shifting fork (6) comprises a shifting fork body (61) and a shifting block (62), the shifting fork body (61) is in splined connection with the gear shifting rotating shaft (13), one end of the shifting fork body (61) is provided with a cylindrical section (611), the cylindrical section (611) and the shifting fork body (61) are coaxially arranged, the shifting block (62) is in clearance fit with the cylindrical section (611) through a round hole (621) formed in the shifting block, a fork opening part (612) is formed in the lower part of the shifting fork body (61), a boss part (622) matched with the fork opening part (612) is formed in the lower part of the shifting block (62), and the positioning groove comprises two locking grooves (613) formed in the radial side of the shifting fork body (61) and two retaining grooves (623) formed in the radial side of the shifting block (62), locking groove (613) and gear groove (623) correspond the setting, locking round pin (7) front end is equipped with respectively with locking groove (613), gear groove (623) complex locking tooth (71) and fender position tooth (72).

4. A reverse gear unit as claimed in claim 3, wherein: the locking groove (613) is a V-shaped groove, and the retaining groove (623) is a rectangular groove.

5. A reverse gear according to claim 4, wherein: locking round pin (7) are along horizontal direction sliding connection on casing (1), are equipped with on the excircle of locking round pin (7) along locking round pin (7) axial extension's rectangle spout (73), be provided with on casing (1) and prevent changeing cylindric lock (14), prevent changeing cylindric lock (14) and can slide in rectangle spout (73).

6. A reverse gear unit as claimed in claim 3, wherein: one end of the gear shifting rotating shaft (13) extends outwards and is provided with a gear shifting foot pedal (15).