Short-stroke gear selecting mechanism and speed changing device of multi-gear speed changer

Abstract

The invention relates to a short-stroke gear selecting mechanism of a multi-gear transmission and a speed change device. The short-stroke gear selecting mechanism comprises a top cover shell, a gear shifting assembly and a gear shifting assembly, wherein the gear shifting assembly and the gear shifting assembly are arranged in the top cover shell; the gear shifting assembly comprises a control shaft, a gear shifting block, a first spring and a gear shifting rocker arm, the control shaft is arranged in the top cover shell, one end of the control shaft is rotatably connected with the top cover shell, the other end of the control shaft penetrates out of the top cover shell and is fixedly connected with the gear shifting rocker arm, the control shaft can rotate in the top cover shell in the axial direction of the control shaft, and a gear shifting area is arranged in the middle of the control shaft. The gear shifting area is sleeved with the gear shifting block, the gear shifting block can move and be positioned in the axial direction of the control shaft, the gear shifting block rotates along with the control shaft to synchronously move, and the front end and the rear end of the gear shifting block are each provided with a first spring; according to the gear selecting mechanism, the gear shifting assembly is improved, the gear shifting assembly has the neutral gear automatic positioning function, the effect of the spring on the gear shifting block is utilized, it is ensured that the position of the gear shifting block is stable in the neutral gear, and the working stability and safety of the gear selecting mechanism are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and more particularly to a short-stroke gear selection mechanism and a speed shifting device of a multi-speed transmission. Background Art

[0002] The gear selector mechanism is a core component of the transmission operating system, responsible for lateral movement during the shifting process to select the target gear shifter pocket and prepare for subsequent gear engagement. The gear selection process is driven by the left and right movement of the shift lever, which is converted by the gear selector cable into the up and down movement of the shift fork shaft, driving the shift finger to precisely align with the target gear shifter pocket, ensuring that the gear shift is ready. Existing gear selectors generally determine whether the gear position is correct based on sensor feedback. However, there is a possibility of misjudgment. For example, when shifting to neutral, if the gear is not fully shifted, the incomplete neutral state can cause abnormal gear engagement, producing a metallic clashing sound, accelerating synchronizer and gear wear, and shortening the transmission life in the long term. Continuous collisions between the shift fork and the side of the gear can cause the shift fork shaft to bend or the shifter pocket to deform, resulting in shifting sticking. Therefore, it is necessary to propose a new short-stroke gear selector mechanism. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention aims to provide a short-stroke gear selection mechanism and a speed change device for a multi-speed transmission, improve the gear shift assembly, make the gear shift assembly have the function of automatic neutral positioning, use the spring to act on the gear shift block, ensure the stable position of the gear shift block in neutral, and improve the working stability and safety of the gear selection mechanism. The above technical objectives of the present invention are achieved through the following technical solutions: A short-stroke gear selection mechanism for a multi-speed transmission comprises a top cover shell and a gear shift assembly and a gear shift assembly arranged in the top cover shell; The shift assembly includes an operating shaft, a shift block, a first spring, and a shift rocker arm. The operating shaft is disposed in the top cover shell. One end of the operating shaft is rotatably connected to the top cover shell. The other end of the operating shaft extends out of the top cover shell and is fixedly connected to the shift rocker arm. The operating shaft is rotatable along its own axis within the top cover shell. A shift area is provided in the middle of the operating shaft. The shift block is sleeved outside the shift area in the middle of the operating shaft. The shift block is movable and positionable along the axial direction of the operating shaft. The shift block moves synchronously with the rotation of the operating shaft. First springs are provided at the front and rear ends of the shift block, respectively. The two first springs are sleeved on the operating shaft. The shift assembly is arranged in the top cover shell, and the shift assembly is connected to the shift block, driving the shift block to move axially along the operating shaft. The top cover shell has a connecting hole on the bottom surface of the shift block moving area, and the connecting foot of the shift block protrudes from the connecting hole to connect with the transmission.

[0004] In one embodiment, the operating 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, and a limiting step is formed at the connection between the first connecting shaft and the second connecting shaft, and 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 is located on the side of the shaft elastic retaining ring facing the second connecting shaft, the shift block is provided on the first connecting shaft and is 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.

[0005] In one embodiment, the first connecting shaft is a spline shaft structure, the connection between the first connecting shaft and the shift block is a spline connection, multiple gears are set at the connection between the first connecting shaft and the shift block, a positioning steel ball is set in the shift block, and a second spring is set between the positioning steel ball and the shift block. The second spring applies pressure to the positioning steel ball so that the positioning steel ball enters the corresponding gear position, thereby realizing the positioning of the shift block and the first connecting shaft.

[0006] In one embodiment, an outer ring gear is provided at one end of the second connecting shaft away from the first connecting shaft, an inner ring gear adapted to the outer ring gear is provided at the shift rocker arm, and the shift rocker arm is meshedly connected to the end of the second connecting shaft.

[0007] In one embodiment, a dust cover is provided between the shift rocker arm and the top cover shell.

[0008] In one embodiment, the shift assembly includes a shift plate, a shift lever, a shift finger and a square key. The shift plate is arranged on the top cover shell, the shift lever passes through the shift plate and is inserted into the top cover shell, the shift lever and the shift plate are rotatably connected, the shift finger is arranged in the top cover shell, and the end of the shift lever inserted into the top cover shell 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, and the other end of the shift finger is connected to the shift block.

[0009] In one embodiment, a neutral gear sensor and a reverse gear sensor are further provided on the top cover shell. The neutral gear sensor is provided outside the position of the shift block when it is in neutral gear, and the reverse gear sensor is provided outside the position of the shift block when it is in reverse gear.

[0010] A speed change device comprises a gearbox and the above-mentioned short-stroke gear selection mechanism, wherein the shift block of the short-stroke gear selection mechanism is connected to the gearbox.

[0011] In summary, the present invention has the following beneficial effects: The present invention provides first springs at the front and rear ends of the shift block respectively to ensure the accuracy of the shift block when returning to the neutral position and maintain the state that the shift block is always in the neutral position. The present invention designs and improves the shift assembly so that the shift assembly has the function of automatic neutral positioning, and utilizes the effect of the spring on the shift block to ensure that the position of the shift block is stable when in neutral, thereby improving the working stability and safety of the gear selection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 is an exploded view of the present invention; Figure 3 It is an internal schematic diagram of the present invention; Figure 4 It is a bottom schematic diagram of the present invention.

[0013] In the figure: 1, top cover shell, 11, gear shift mounting portion, 12, shift paddle mounting portion, 13, neutral gear sensor, 14, reverse gear sensor, 15, connecting hole; 2. Shift assembly, 21. Shift plate, 22. Shift lever, 23. Shift finger, 24. Square key; 3. Shift assembly, 31. Operating shaft, 311. First connecting shaft, 312. Second connecting shaft, 313. Gear position, 32. Shift block, 321. Positioning steel ball, 322. Second spring, 33. Shift rocker arm, 34. First spring, 35. Elastic circlip for shaft, 36. Flat washer, 37. Dust cover. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0015] It is worth noting that the directional words such as "upper" and "lower" involved in this article are all relative to the perspective of the drawings. They are only for the convenience of description and cannot be understood as limitations on the technical solution.

[0016] like Figure 1-4 As shown, the present invention provides a short-stroke gear selection mechanism for a multi-speed transmission, comprising a top cover 1 and a gear shift assembly 3 and a shift assembly 2 disposed within the top cover 1. The gear shift assembly 3 is connected to the shift assembly 2, and gear shifting is performed after the gear shift is completed. The specific structure is as follows: The shift assembly 3 includes an operating shaft 31, a shift block 32, a first spring 34, and a shift rocker arm 33. The operating shaft 31 is disposed within the top cover shell 1. One end of the operating shaft 31 is rotatably connected to the top cover shell 1, and the other end of the operating shaft 31 extends through the top cover shell 1 and is fixedly connected to the shift rocker arm 33. Within the top cover shell 1, the operating shaft 31 is rotatable along its own axis. A shift area is provided in the middle of the operating shaft 31. The shift block 32 is sleeved on the middle of the operating shaft 31. The shift block 32 is movable and positionable along the axial direction of the operating shaft 31. The shift block 32 moves synchronously with the rotation of the operating shaft 31. First springs 34 are provided at the front and rear ends of the shift block 32, and the two first springs 34 are sleeved on the operating shaft 31. The shift assembly 2 is arranged in the top cover shell 1, and the shift assembly 2 is connected to the shift block 32, driving the shift block 32 to move axially along the operating shaft 31. The top cover shell 1 has a connecting hole 15 on the bottom surface of the moving area of ​​the shift block 32, and the connecting foot of the shift block 32 protrudes from the connecting hole 15 to connect with the transmission.

[0017] 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 operating shaft 31, the shift block 32 can move axially along the operating shaft 31. The rotation of the shift block 32 on the operating shaft 31 is restricted by the operating shaft 31, and the shift block 32 rotates synchronously with the operating shaft 31. When the shift block 32 moves axially along the operating shaft 31, it is in the gear selection state. At this time, the shift block 32 is controlled by the shift assembly 2 and locked with the operating shaft 31 after the shift block 32 moves axially into position. When the shift block 32 rotates along the operating shaft 31, it is in the gear shifting state. At this time, the shift block 32 is controlled by the shift rocker 33 to rotate, thereby 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 of the two first springs 34 applies pressure to the shift block 32, causing the shift block 32 to return to the neutral position. Then, the two first springs 34 do not apply pressure to the shift block 32, or the two first springs 34 apply equal and opposite pressures to the shift block 32, ensuring that the shift block 32 is in the neutral position. It is easy to understand that when the shift block 32 is in a gear position 313 other than the neutral position, one of the first springs 34 is compressed, while the other first spring 34 is in a relaxed state.

[0018] 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 always in the neutral position, thereby effectively improving safety.

[0019] Furthermore, the operating shaft 31 is formed by connecting the first connecting shaft 311 and the 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 circlip 35 and a flat washer 36 are provided on the first connecting shaft 311. An annular groove that cooperates with the shaft elastic circlip 35 is provided on the first connecting shaft 311. The shaft elastic circlip 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 circlip 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. A 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.

[0020] 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.

[0021] 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 gears 313 are set at the connection between the first connecting shaft 311 and the shift block 32. A positioning steel ball 321 is set in the shift block 32, and 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 gear 313, thereby realizing the positioning of the shift block 32 and the first connecting shaft 311. It is easy to understand that a space is provided in the shift block 32 for installing a positioning steel ball 321 and a second spring 322, and the 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 gear shifting, the positioning steel ball 321 can roll along the key groove 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, limiting 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.

[0022] Furthermore, an outer ring gear is provided at one end of the second connecting shaft 312 away from the first connecting shaft 311, and an inner ring gear adapted to the outer ring gear is provided at the shift rocker arm 33. The shift rocker arm 33 is meshedly connected to the end of the second connecting shaft 312, so that the operating shaft 31 can be driven to rotate as a whole by rotating the shift rocker arm 33.

[0023] Preferably, a dust cover 37 is provided between the shift rocker arm 33 and the top cover shell 1 .

[0024] In the present 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 set on the top cover shell 1, and the shift lever 22 passes through the shift plate 21 and is inserted into the top cover shell 1. The shift lever 22 is rotatably connected to the shift plate 21. The shift finger 23 is set in the top cover shell 1, and the end of the shift lever 22 inserted into the top cover shell 1 passes through one end of the shift finger 23. A square key 24 is set 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, the shift finger 23 rotates, and the shift finger 23 drives the shift block 32 to move on the operating shaft 31, thereby achieving gear selection. It is easy to understand that the connection method between the shift assembly 2 and the shift block 32 of the present invention is an existing structure and will not be repeated in this invention.

[0025] In the present invention, a neutral sensor 13 and a reverse sensor 14 are further provided on the top cover 1. The neutral sensor 13 is provided 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 into position when it is shifted into neutral. The reverse sensor 14 is provided 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 into position when it is shifted into reverse. The sensors of the present invention are conventional existing sensors and will not be described in detail herein.

[0026] like Figure 1-2 As shown, the top cover shell 1 of the present invention can be divided into a shift mounting portion 11 and a paddle shift mounting portion 12, the paddle shift mounting portion 12 is arranged in the middle of the shift mounting portion 11, wherein the space of the shift mounting portion 11 and the paddle shift mounting portion 12 is connected, wherein the paddle shift assembly 2 is arranged in the paddle shift mounting portion 12, and the shift mounting portion 11 is arranged in the shift mounting portion 11, along the length direction of the shift mounting portion 11, one end of the shift mounting portion 11 is a sealed end, and the other end of the shift mounting portion 11 is an open end, and a connecting hole 15 is provided at the intersection of the paddle shift mounting portion 12 and the shift mounting portion 11 to facilitate the connection of the shift assembly 3 with the transmission.

[0027] The present invention improves the design of the shift assembly 3 so that the shift assembly 3 has the function of automatic neutral positioning, and uses the action of the spring on the shift block 32 to ensure that the position of the shift block 32 is stable when in neutral, thereby improving the working stability of the gear selection mechanism.

[0028] 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 embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart 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 gear selection mechanism for a multi-speed transmission, characterized in that: It comprises a top cover shell (1) and a shift assembly (3) and a shift assembly (2) arranged in the top cover shell (1); The shift assembly (3) includes an operating shaft (31), a shift block (32), a first spring (34) and a shift rocker arm (33). The operating shaft (31) is arranged in the top cover shell (1). One end of the operating shaft (31) is rotatably connected to the top cover shell (1). The other end of the operating shaft (31) passes through the top cover shell (1) and is fixedly connected to the shift rocker arm (33). In the top cover shell (1), the operating shaft (31) is rotatable along its own axis. A shift area is provided in the middle of the operating shaft (31). The shift block (32) is sleeved outside the shift area in the middle of the operating shaft (31). The shift block (32) is movable and positionable along the axis of the operating shaft (31). The shift block (32) moves synchronously with the rotation of the operating shaft (31). First springs (34) are provided at the front and rear ends of the shift block (32). The two first springs (34) are sleeved on the operating shaft (31). The shift assembly (2) is arranged in the top cover shell (1), and the shift assembly (2) is connected to the shift block (32), driving the shift block (32) to move axially along the operating shaft (31). The top cover shell (1) has a connecting hole (15) on the bottom surface of the shift block (32) moving area, and the connecting pin of the shift block (32) protrudes from the connecting hole (15) to be connected to the transmission.

2. The short-stroke shift selection mechanism of a multi-speed transmission according to claim 1, characterized in that: The operating 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 circlip (35) and a flat washer (36) are provided on the first connecting shaft (311). The shaft elastic circlip (35) The first connecting shaft (311) 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, a 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.

3. The short-stroke shift selection mechanism of a multi-speed transmission according to claim 2, characterized in that: 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. A plurality of gear 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 in the shift block (32), and 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), so that the positioning steel ball (321) enters the corresponding gear position (313), thereby realizing the positioning of the shift block (32) and the first connecting shaft (311).

4. The short-stroke shift selection mechanism of a multi-speed transmission according to claim 2, wherein: An outer gear ring is provided at one end of the second connecting shaft (312) away from the first connecting shaft (311), and an inner gear ring adapted to the outer gear ring is provided on the shift rocker arm (33). The shift rocker arm (33) is meshedly connected with the end of the second connecting shaft (312).

5. The short-stroke gear selection mechanism of a multi-speed transmission according to claim 4, characterized in that: A dust cover (37) is provided between the shift rocker arm (33) and the top cover shell (1).

6. The short-stroke gear selection mechanism of a multi-speed transmission according to any one of claims 1 to 5, 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 arranged on the top cover shell (1). The shift lever (22) passes through the shift plate (21) and is inserted into the top cover shell (1). The shift lever (22) is rotatably connected to the shift plate (21). The shift finger (23) is arranged in the top cover shell (1), and one end of the shift lever (22) inserted into the top cover shell (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).

7. The short-stroke gear selection mechanism of a multi-speed transmission according to any one of claims 1 to 5, characterized in that: A neutral gear sensor (13) and a reverse gear sensor (14) are also provided on the top cover shell (1). The neutral gear sensor (13) is provided outside the position of the shift block (32) when it is in neutral gear, and the reverse gear sensor (14) is provided outside the position of the shift block (32) when it is in reverse gear.

8. A speed change device, comprising a gearbox and the above-mentioned short-stroke gear selection mechanism, wherein the shift block (32) of the short-stroke gear selection mechanism is connected to the gearbox.

Images