Short stroke gear selection mechanism for a multi-gear transmission and a transmission

Abstract

This invention relates to a short-stroke gear selection mechanism and transmission device for a multi-speed transmission. The short-stroke gear selection mechanism includes a top cover and a shift assembly and a shifting assembly disposed within the top cover. The shift assembly includes a control shaft, a shift block, a first spring, and a shift rocker arm. The control shaft is disposed within the top cover, with one end rotatably connected to the top cover and the other end extending through the top cover and fixedly connected to the shift rocker arm. Within the top cover, the control shaft is rotatable along its own axial direction. A shifting area is provided in the middle of the control shaft, and the shift block is sleeved outside the shifting area. The shift block is movable and positioned along the axial direction of the control shaft and moves synchronously with the rotation of the control shaft. First springs are respectively provided at the front and rear ends of the shift block. This invention improves the shift assembly, enabling it to automatically position itself in neutral. By utilizing the spring's action on the shift block, the stability of the shift block position in neutral is ensured, thereby improving the working stability and safety of the gear selection mechanism.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and more specifically, to a short-stroke gear selection mechanism and transmission device for a multi-gear transmission. Background Technology

[0002] The gear selector mechanism is a core component of the transmission operating system. It is responsible for lateral movement during gear shifting to select the target gear shift lever groove, preparing for subsequent gear engagement. The gear selection process is driven by the left-right movement of the gear lever, which is converted into the up-and-down movement of the shift fork shaft via the shift cable. This movement precisely aligns the shift fingers with the target gear shift groove, ensuring readiness for gear shifting. Existing gear selector mechanisms generally rely on sensor feedback to determine gear accuracy; however, misjudgments are possible. For example, when shifting to neutral, if the shift is incomplete, the incomplete neutral engagement can lead to abnormal gear meshing, producing a metallic clanging sound, accelerating wear on the synchronizer and gears, and ultimately shortening the transmission's lifespan. Continuous collisions between the shift fork and the gear side can cause the shift fork shaft to bend or the shift groove to deform, leading to shift jamming. Therefore, it is necessary to propose a new short-stroke gear selector mechanism. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a short-stroke gear selection mechanism and transmission device for a multi-gear transmission. It improves the shifting assembly, enabling it to automatically position itself in neutral. By utilizing the spring's action on the shift block, it ensures the stability of the shift block position in neutral, thereby enhancing the operational stability and safety of the gear selection mechanism.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0005] A short-stroke gear selection mechanism for a multi-speed transmission includes a top cover and a shifting assembly and a shifting assembly disposed within the top cover;

[0006] The shift assembly includes a control shaft, a shift block, a first spring, and a shift rocker arm. The control shaft is located inside the top cover housing. One end of the control shaft is rotatably connected to the top cover housing, and the other end of the control shaft extends out of the top cover housing and is fixedly connected to the shift rocker arm. Inside the top cover housing, the control shaft can rotate along its own axis. A shift area is provided in the middle of the control shaft. The shift block is sleeved outside the shift area in the middle of the control shaft. The shift block can move and be positioned along the axis of the control shaft. The shift block moves synchronously with the rotation of the control shaft. A first spring is provided at the front and rear ends of the shift block, and the two first springs are sleeved on the control shaft.

[0007] The shift assembly is located inside the top cover and is connected to the shift block, driving the shift block to move axially along the control shaft. The top cover has a connection hole on the bottom surface of the shift block's moving area, and the shift block's connecting foot protrudes from the connection hole and connects to the transmission.

[0008] In one embodiment, the control shaft is formed by connecting a first connecting shaft and a second connecting shaft. The first connecting shaft and the second connecting shaft are coaxially arranged, and the outer diameter of the first connecting shaft is smaller than the outer diameter of the second connecting shaft. A limiting step is formed at the connection between the first connecting shaft and the second connecting shaft. A shaft elastic retaining ring and a flat washer are provided on the first connecting shaft. The shaft elastic retaining ring is fixedly connected to the first connecting shaft. The flat washer is sleeved on the first connecting shaft and located on the side of the shaft elastic retaining ring facing the second connecting shaft. A shift block is provided on the first connecting shaft and located between the flat washer and the limiting step. A first spring is provided between the shift block and the flat washer, and another first spring is provided between the shift block and the limiting step.

[0009] In one embodiment, the first connecting shaft is a spline shaft structure, and the connection between the first connecting shaft and the shift block is a spline connection. Multiple positions are provided at the connection between the first connecting shaft and the shift block. A positioning steel ball is provided inside the shift block, and a second spring is provided between the positioning steel ball and the shift block. The second spring applies pressure to the positioning steel ball, causing the positioning steel ball to enter the corresponding position, thereby realizing the positioning of the shift block and the first connecting shaft.

[0010] In one embodiment, an external gear ring is provided at the end of the second connecting shaft away from the first connecting shaft, and an internal gear ring adapted to the external gear ring is provided on the shift rocker arm, and the shift rocker arm is meshed with the end of the second connecting shaft.

[0011] In one embodiment, a dust cover is provided between the shift rocker arm and the top cover.

[0012] In one embodiment, the shift assembly includes a shift plate, a shift lever, a shift finger, and a square key. The shift plate is disposed on the top cover, the shift lever passes through the shift plate and is inserted into the top cover, and the shift lever is rotatably connected to the shift plate. The shift finger is disposed in the top cover, and one end of the shift lever inserted into the top cover passes through one end of the shift finger. A square key is provided at the connection between the shift lever and the shift finger, so that the shift finger rotates with the shift lever. The other end of the shift finger is connected to the shift block.

[0013] In one embodiment, a neutral sensor and a reverse sensor are also provided on the top cover. The neutral sensor is located outside the position where the shift block is in neutral, and the reverse sensor is located outside the position where the shift block is in reverse.

[0014] A transmission device includes a gearbox and the aforementioned short-stroke gear selector, wherein the shift block of the short-stroke gear selector is connected to the gearbox.

[0015] In summary, the present invention has the following beneficial effects:

[0016] This invention provides first springs at the front and rear ends of the shift block to ensure the accuracy of the shift block returning to the neutral position and to maintain the shift block in the neutral position at all times. This invention improves the shift assembly, enabling it to automatically position itself in neutral. By utilizing the springs on the shift block, the stability of the shift block position in neutral is ensured, thereby improving the working stability and safety of the shift mechanism. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of the present invention;

[0018] Figure 2 This is an exploded view of the present invention;

[0019] Figure 3 This is an internal schematic diagram of the present invention;

[0020] Figure 4 This is a schematic diagram of the bottom surface of the present invention.

[0021] In the diagram: 1. Top cover, 11. Gear shift mounting part, 12. Gear shift mounting part, 13. Neutral sensor, 14. Reverse sensor, 15. Connecting hole;

[0022] 2. Shift lever assembly; 21. Shift lever plate; 22. Shift lever; 23. Shift lever finger; 24. Square key;

[0023] 3. Gear shifting assembly; 31. Control shaft; 311. First connecting shaft; 312. Second connecting shaft; 313. Gear position; 32. Gear shifting block; 321. Positioning steel ball; 322. Second spring; 33. Gear shifting rocker arm; 34. First spring; 35. Shaft elastic retaining ring; 36. Flat washer; 37. Dust cover. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It is worth noting that the directional terms such as "up" and "down" used in this article are all relative to the perspective of the attached figures and are only for the purpose of description. They should not be interpreted as limitations on the technical solutions.

[0026] like Figure 1-4 As shown, this invention provides a short-stroke gear selection mechanism for a multi-gear transmission, including a top cover 1 and a shifting assembly 3 and a shifting assembly 2 disposed within the top cover 1. The shifting assembly 3 is connected to the shifting assembly 2, and shifting occurs after shifting is completed. The specific structure is as follows:

[0027] The shift assembly 3 includes a control shaft 31, a shift block 32, a first spring 34, and a shift rocker arm 33. The control shaft 31 is disposed inside the top cover 1. One end of the control shaft 31 is rotatably connected to the top cover 1, and the other end of the control shaft 31 extends out of the top cover 1 and is fixedly connected to the shift rocker arm 33. Inside the top cover 1, the control shaft 31 is rotatable along its own axis. A shift area is provided in the middle of the control shaft 31. The shift block 32 is sleeved in the middle of the control shaft 31. The shift block 32 is movable and positioned along the axis of the control shaft 31. The shift block 32 moves synchronously with the rotation of the control shaft 31. The front and rear ends of the shift block 32 are respectively provided with first springs 34, and the two first springs 34 are sleeved on the control shaft 31.

[0028] The shift assembly 2 is located inside the top cover 1 and is connected to the shift block 32, driving the shift block 32 to move axially along the control shaft 31. The top cover 1 has a connection hole 15 on the bottom surface of the shift block 32's moving area, and the connecting foot of the shift block 32 protrudes from the connection hole 15 to connect with the transmission.

[0029] The shift block 32 is connected to an external transmission. In the shift assembly 3, based on the connection between the shift block 32 and the control shaft 31, the shift block 32 can move along the axial direction of the control shaft 31. The rotation of the shift block 32 on the control shaft 31 is restricted by the control shaft 31, and the shift block 32 and the control shaft 31 rotate synchronously. When the shift block 32 moves axially along the control shaft 31, it is in the gear selection state. In this state, the shift block 32 is controlled by the shift assembly 2, and once it reaches its axial position, it locks with the control shaft 31. When the shift block 32 rotates with the control shaft 31, it is in the gear shifting state. In this state, the shift block 32 is controlled by the shift rocker arm 33, thus achieving gear shifting. When the shift block 32 returns to the neutral position, in addition to being controlled by the shift assembly 2, the compressed first spring 34 applies pressure to the shift block 32, causing it to return to the neutral position. Then, the two first springs 34 either do not apply pressure to the shift block 32 or apply equal and opposite pressures to ensure the shift block 32 is in the neutral position. It is easy to understand that when the shift block 32 is in any of the gears 313 except neutral, one of the first springs 34 will be compressed, while the other will be relaxed.

[0030] The present invention provides first springs 34 at the front and rear ends of the shift block 32 to ensure the accuracy of the shift block 32 when returning to the neutral position and to maintain the shift block 32 in the neutral position at all times, thereby effectively improving safety.

[0031] Furthermore, the control shaft 31 is formed by connecting a first connecting shaft 311 and a second connecting shaft 312. The first connecting shaft 311 and the second connecting shaft 312 are coaxially arranged, and the outer diameter of the first connecting shaft 311 is smaller than the outer diameter of the second connecting shaft 312. A limiting step is formed at the connection between the first connecting shaft 311 and the second connecting shaft 312. A shaft elastic retaining ring 35 and a flat washer 36 are provided on the first connecting shaft 311. An annular groove that mates with the shaft elastic retaining ring 35 is opened on the first connecting shaft 311. The shaft elastic retaining ring 35 is fixedly connected to the first connecting shaft 311. The flat washer 36 is sleeved on the first connecting shaft 311 and is located on the side of the shaft elastic retaining ring 35 facing the second connecting shaft 312. The shift block 32 is arranged on the first connecting shaft 311 and is located between the flat washer 36 and the limiting step. One first spring 34 is arranged between the shift block 32 and the flat washer 36, and another first spring 34 is arranged between the shift block 32 and the limiting step. It is easy to understand that when the shift block 32 is in the neutral position, the lengths of the two first springs 34 are the same or close. That is, when the shift block 32 is in the neutral position, the distance between the end of the shift block 32 and the flat washer 36 on the same side and the distance between the end of the shift block 32 and the limiting step on the same side are the same.

[0032] Preferably, when the shift block 32 is in the neutral position, the distance between one end of the shift block 32 and the flat washer 36 on the same side is 50 mm, and the distance between the other end of the shift block 32 and the limiting step on the same side is 50 mm.

[0033] Preferably, the first connecting shaft 311 is a spline shaft structure, and the connection between the first connecting shaft 311 and the shift block 32 is a spline connection. Multiple positions 313 are provided at the connection between the first connecting shaft 311 and the shift block 32. A positioning steel ball 321 is provided inside the shift block 32. A second spring 322 is provided between the positioning steel ball 321 and the shift block 32. The second spring 322 applies pressure to the positioning steel ball 321, causing the positioning steel ball 321 to enter the corresponding position 313, thereby realizing the positioning of the shift block 32 and the first connecting shaft 311. It is easy to understand that the shift block 32 has a space for installing the positioning steel ball 321 and the second spring 322. This space leads to the side of the first connecting shaft 311. When the shift block 32 moves on the first connecting shaft 311 to achieve shifting, the positioning steel ball 321 can roll along the keyway on the side of the first connecting shaft 311 to reduce the friction of the shift block 32 moving on the first connecting shaft 311 until the positioning steel ball 321 enters the corresponding gear position 313. At this time, the positioning steel ball 321 is embedded in the gear position 313, restricting the axial movement of the shift block 32. Since the shift block 32 and the first connecting shaft 311 are splined, the shift block 32 will rotate synchronously with the first connecting shaft 311.

[0034] Furthermore, an external gear ring is provided at the end of the second connecting shaft 312 away from the first connecting shaft 311, and an internal gear ring adapted to the external gear ring is provided on the shift rocker arm 33. The end of the shift rocker arm 33 is meshed with the end of the second connecting shaft 312, so that the entire control shaft 31 can be rotated by rotating the shift rocker arm 33.

[0035] Preferably, a dust cover 37 is provided between the shift rocker arm 33 and the top cover 1.

[0036] In this invention, the shift assembly 2 includes a shift plate 21, a shift lever 22, a shift finger 23, and a square key 24. The shift plate 21 is disposed on the top cover 1. The shift lever 22 passes through the shift plate 21 and is inserted into the top cover 1, and the shift lever 22 is rotatably connected to the shift plate 21. The shift finger 23 is disposed inside the top cover 1, and one end of the shift lever 22 inserted into the top cover 1 passes through one end of the shift finger 23. A square key 24 is provided at the connection between the shift lever 22 and the shift finger 23, so that the shift finger 23 rotates with the shift lever 22. The other end of the shift finger 23 is connected to the shift block 32. Figure 2-4 As shown, when the shift lever 22 rotates, it drives the shift finger 23 to rotate, which in turn drives the shift block 32 to move on the control shaft 31, thereby achieving gear selection. It is easy to understand that the connection between the shift assembly 2 and the shift block 32 in this invention is a conventional structure, and will not be described in detail here.

[0037] In this invention, the top cover 1 is further provided with a neutral sensor 13 and a reverse sensor 14. The neutral sensor 13 is located outside the position of the shift block 32 when it is in neutral, and is used to detect whether the shift block 32 has moved to neutral when it is in neutral. The reverse sensor 14 is located outside the position of the shift block 32 when it is in reverse, and is used to detect whether the shift block 32 has moved to reverse when it is in reverse. The sensors of this invention are conventional sensors, and will not be described in detail here.

[0038] like Figure 1-2 As shown, the top cover 1 of the present invention can be divided into a shift mounting part 11 and a shift mounting part 12. The shift mounting part 12 is disposed in the middle of the shift mounting part 11. The shift mounting part 11 and the shift mounting part 12 are spatially connected. The shift assembly 2 is disposed in the shift mounting part 12. The shift mounting part 11 is disposed in the shift mounting part 11. Along the length direction of the shift mounting part 11, one end of the shift mounting part 11 is a sealed end and the other end of the shift mounting part 11 is an open end. A connecting hole 15 is provided at the intersection of the shift mounting part 12 and the shift mounting part 11 to facilitate the connection between the shift assembly 3 and the transmission.

[0039] The present invention improves the design of the shift assembly 3, enabling the shift assembly 3 to have the function of automatic neutral positioning. By utilizing the action of the spring on the shift block 32, the position of the shift block 32 is ensured to be stable in neutral, thereby improving the working stability of the shift selection mechanism.

[0040] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A short stroke selector mechanism for a multi-gear transmission, characterized in that Includes a top cover (1) and a shift assembly (3) and a shifting assembly (2) disposed within the top cover (1); The shift assembly (3) includes a control shaft (31), a shift block (32), a first spring (34), and a shift rocker arm (33). The control shaft (31) is located inside the top cover (1). One end of the control shaft (31) is rotatably connected to the top cover (1), and the other end of the control shaft (31) extends out from the top cover (1) and is fixedly connected to the shift rocker arm (33). Inside the top cover (1), the control shaft (31) can rotate along its own axis. A shift area is provided in the middle of the control shaft (31). The shift block (32) is sleeved outside the shift area in the middle of the control shaft (31). The shift block (32) can move and be positioned along the axis of the control shaft (31). The shift block (32) moves synchronously with the rotation of the control shaft (31). The front and rear ends of the shift block (32) are respectively provided with first springs (34), and the two first springs (34) are sleeved on the control shaft (31). The shift assembly (2) is located inside the top cover (1) and is connected to the shift block (32). The shift block (32) is driven to move axially along the control shaft (31). The top cover (1) has a connection hole (15) on the bottom surface of the shift block (32) movement area. The connecting foot of the shift block (32) protrudes from the connection hole (15) and connects to the transmission. The control shaft (31) is formed by connecting a first connecting shaft (311) and a second connecting shaft (312). The first connecting shaft (311) and the second connecting shaft (312) are coaxially arranged, and the outer diameter of the first connecting shaft (311) is smaller than the outer diameter of the second connecting shaft (312). A limiting step is formed at the connection between the first connecting shaft (311) and the second connecting shaft (312). A shaft elastic retaining ring (35) and a flat washer (36) are provided on the first connecting shaft (311). Fixedly connected to the first connecting shaft (311), the flat washer (36) is sleeved on the first connecting shaft (311) and located on the side of the shaft elastic retaining ring (35) facing the second connecting shaft (312), the shift block (32) is disposed on the first connecting shaft (311) and located between the flat washer (36) and the limiting step, one first spring (34) is disposed between the shift block (32) and the flat washer (36), and another first spring (34) is disposed between the shift block (32) and the limiting step; The first connecting shaft (311) is a spline shaft structure. The connection between the first connecting shaft (311) and the shift block (32) is a spline connection. Multiple positions (313) are set at the connection between the first connecting shaft (311) and the shift block (32). A positioning steel ball (321) is set inside the shift block (32). A second spring (322) is set between the positioning steel ball (321) and the shift block (32). The second spring (322) applies pressure to the positioning steel ball (321) so that the positioning steel ball (321) enters the corresponding position (313) to realize the positioning of the shift block (32) and the first connecting shaft (311). The second connecting shaft (312) has an external gear ring at one end away from the first connecting shaft (311), and the shift rocker arm (33) has an internal gear ring that matches the external gear ring. The shift rocker arm (33) is meshed with the end of the second connecting shaft (312).

2. A short stroke selector mechanism for a multi-gear transmission according to claim 1, characterized in that A dust cover (37) is provided between the shift rocker arm (33) and the top cover (1).

3. Short stroke selector mechanism for a multi-gear transmission according to any of claims 1-2, characterized in that The shift assembly (2) includes a shift plate (21), a shift lever (22), a shift finger (23), and a square key (24). The shift plate (21) is mounted on the top cover (1). The shift lever (22) passes through the shift plate (21) and is inserted into the top cover (1). The shift lever (22) is rotatably connected to the shift plate (21). The shift finger (23) is mounted inside the top cover (1), and one end of the shift lever (22) inserted into the top cover (1) passes through one end of the shift finger (23). A square key (24) is provided at the connection between the shift lever (22) and the shift finger (23) so that the shift finger (23) rotates with the shift lever (22). The other end of the shift finger (23) is connected to the shift block (32).

4. Short stroke selector mechanism for a multi-gear transmission according to any of claims 1 to 2, characterized in that The top cover (1) is also provided with a neutral sensor (13) and a reverse sensor (14). The neutral sensor (13) is located outside the position of the shift block (32) when it is in neutral, and the reverse sensor (14) is located outside the position of the shift block (32) when it is in reverse.

5. A transmission device, comprising a gearbox and a short-stroke gear selection mechanism of a multi-speed gearbox as claimed in any one of claims 1-4, wherein the shift block (32) of the short-stroke gear selection mechanism is connected to the gearbox.

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