Method for pushing clutch to be clutched in gearbox

Abstract

The propulsion mechanism comprises an axial propulsion device, a worm and gear device and a driving motor, the axial propulsion device is arranged on an input shaft and comprises an annular push disc arranged on the side, adjacent to the clutch, of the input shaft in a sleeving mode, and the annular push disc rotates around the input shaft and drives the clutch to be engaged and disengaged at the same time. The worm and gear device can conduct axial propelling on the input shaft, the worm and gear device comprises an annular worm gear and a worm, the annular worm gear is fixed around the periphery of the annular pushing disc, one end of the worm is meshed with the annular worm gear, and the other end of the worm is connected with the driving motor. The annular push plate is pushed towards the clutch to close the clutch, or the annular push plate is retreated to disengage the clutch. The axial propulsion device has the advantages that the control precision is high, the performance is stable, the axial propulsion device is arranged depending on the input shaft and does not occupy extra external space, and the overall structure is much simpler than that of a hydraulic pneumatic cylinder and a pumping system thereof.

Description

Technical Field

[0001] The invention relates to a method for pushing a clutch to engage or disengage in a gearbox, and belongs to the technical field of gearbox clutch equipment. Background Art

[0002] In the AMT reducer of automobiles, an electronically controlled mechanical automatic transmission is used. The gear shifting generally adopts a ball screw to push the shift fork to slide on the shift fork shaft, or the shift fork and shift fork shaft assembly slides in the mounting hole of the shift fork shaft on the housing, and then the shift block installed on the shift fork drives the synchronizer ring to switch. In this shifting method, there is sliding friction between the shift block and the synchronizer ring, and the shift block is subject to wear. As the product is used for a longer time, the shift block wear increases. When its wear reaches a certain upper limit, the gap between the shift block and the synchronizer ring is larger. When the shift block moves a stroke required for shifting, due to the influence of the shift block wear, the actual axial distance moved by the synchronizer ring is less than the shift stroke, which affects the shift sensitivity and may even cause gear disengagement or gear playing, resulting in product damage.

[0003] In the AT reducer, a clutch-controlled automatic transmission is used, which controls the engagement and disengagement of the clutch through oil pressure to achieve gear switching. The required oil pressure system involves an oil pump for oil supply, a piston or valve to control oil pressure, and an oil circuit system. The oil pressure control system structure is relatively complex and the cost is relatively high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to achieve reliable clutch operation with a relatively simple propulsion mechanism.

[0005] In view of the above problems, the technical solution proposed by the present invention is: A propulsion mechanism for pushing a clutch to engage or disengage in a gearbox comprises an axial propulsion device, a worm gear device and a drive motor. The axial propulsion device is arranged on an input shaft and comprises an annular push plate sleeved on the input shaft on the side adjacent to the clutch. The annular push plate can be axially propelled on the input shaft while rotating around the input shaft. The worm gear device comprises an annular turbine fixed around the outer circumference of the annular push plate, and a worm gear having one end engaged with the annular turbine and the other end connected to the drive motor. When in use, the drive motor drives the annular push plate to rotate through the worm gear device, so that the annular push plate is pushed toward the clutch to close the clutch, or the annular push plate is retracted to disengage the clutch.

[0006] The worm is fixed in position, and when the annular turbine is pushed to rotate around the input shaft, the annular turbine slides relative to the worm along its own axial direction.

[0007] The axial propulsion device also includes an annular fixed plate sleeved on the input shaft adjacent to the annular push plate, the annular fixed plate is located on the side away from the clutch and is always subjected to pressure from the clutch, and at least three arc-shaped rolling grooves 1 are provided at equal intervals on the side of the annular fixed plate facing the annular push plate, one end of the rolling groove 1 is deep end 1, and the other end is shallow end 1, and the depth of the rolling groove 1 gradually changes from shallow end 1 to deep end 1; on the side of the annular push plate facing the annular fixed plate, rolling grooves 2 are provided at equal intervals, the same number as the rolling groove 1, one end of the rolling groove 2 is deep end 2, and the other end is shallow end 2, and the depth of the rolling groove 2 gradually changes from shallow end 2 to deep end 2, and the rolling groove 2 gradually changes from shallow end 2 to deep end 2. The direction from the shallow end to the deep end is opposite to the direction from the shallow end to the deep end of the rolling groove 1; each rolling groove 1 corresponds to a rolling groove 2, and a rolling ball is provided between the corresponding rolling groove 1 and rolling groove 2. When the clutch is in a disengaged state, the deep end 1 of the rolling groove 1 corresponds axially to the deep end 2 of the rolling groove 2, and the rolling ball is simultaneously located in the deep end 1 and the deep end 2 and simultaneously contacts the groove bottoms of the deep end 1 and the deep end 2; the rotation direction of the annular push plate is from the deep end 1 of the rolling groove 1 to the shallow end 1, or from the shallow end 1 of the rolling groove 1 to the deep end 1, and the rolling ball simultaneously reaches the shallow end 1 and the shallow end 2 from the deep end 1 and the deep end 2, or from the shallow end 1 and the shallow end 2 to the deep end 1 and the deep end 2 in a rolling manner.

[0008] One side of the annular fixed disk is provided with a protruding positioning foot. During assembly, the outer end of the positioning foot is inserted into a positioning groove provided on the inner wall of the housing of the gearbox.

[0009] A grinding disc that can slide on the input shaft is provided between the clutch and the annular push plate. The edge of the grinding disc is inclined toward the friction plate of the annular clutch. The annular push plate pushes the grinding disc so that the friction plate clamps the steel plate of the clutch.

[0010] A return spring is provided between the grinding disc and the clutch. When the annular push disc retreats away from the clutch, the return spring pushes the grinding disc so that the grinding disc slides against the annular push disc.

[0011] A pressure bearing is provided between the annular push plate and the grinding plate.

[0012] A lubricating branch oil channel is radially arranged on the input shaft to connect the main lubricating oil channel of the axis and the pressure bearing.

[0013] The axial propulsion device includes a shaft outer sleeve fixedly sleeved on the outside of the input shaft, the shaft outer sleeve is provided with an external thread, the annular push plate is provided with a corresponding internal thread, and the annular push plate is sleeved on the shaft outer sleeve through threaded cooperation.

[0014] The annular turbine is semi-annular. Beneficial effects

[0015] The control accuracy is high and the performance is stable. The axial propulsion device is set on the input shaft and does not occupy any external space. The overall structure is much simpler than the hydraulic cylinder and its pump pressure system, thus simply and reliably solving the clutch and clutch execution problem of the transmission shift mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional schematic diagram of a gearbox having a propulsion mechanism for driving a clutch; Figure 2 is a cross-sectional schematic diagram of a gearbox; Figure 3 This is a partial schematic cross-sectional view of a gearbox, showing the structure of the propulsion mechanism; Figure 4 It is a schematic diagram of the structural relationship between the axial propulsion device, the worm gear device and the drive motor; Figure 5 This is a disassembled schematic diagram of the axial propulsion device; Figure 6 Schematic diagram of a rolling ball in rolling groove 1 and rolling groove 2, showing that the rolling ball is located in deep end 1 and deep end 2 at the same time; Figure 7 This is a schematic diagram of the rolling ball in rolling groove 1 and rolling groove 2, which shows that the rolling ball is located in shallow end 1 and shallow end 2 at the same time.

[0017] In the figure: 1. Axial propulsion device; 11. Annular fixed plate; 110. Rolling groove one; 1101. Deep end one; 1102. Shallow end one; 111. Positioning foot; 12. Annular push plate; 120. Rolling groove two; 1201. Deep end two; 1202. Shallow end two; 13. Rolling ball; 2. Turbine-worm gear device; 21. Annular turbine; 22. Worm; 3. Driving motor; 4. Grinding disc; 5. Return spring; 6. Pressure bearing; 7. Clutch; 71. Wipe plate; 72. Steel plate; 8. Input shaft; 81. Main lubricating oil channel of the axis; 82. Lubricating branch oil channel; 100. Housing; 101. Positioning groove. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1

[0019] like Figure 1 、 2As shown, a propulsion mechanism for driving a clutch in a transmission includes an axial propulsion device 1, a worm gear device 2, and a drive motor 3. The axial propulsion device 1 is provided on the input shaft 8 and includes an annular push plate 12 mounted on the input shaft 8 on the side adjacent to the clutch 7. The annular push plate 12 can axially propel the input shaft 8 while rotating about the input shaft. The worm gear device 2 includes an annular turbine 21 fixed around the outer circumference of the annular push plate 12, and a worm 22 having one end meshing with the annular turbine 21 and the other end connected to the drive motor 3. During operation, the drive motor 3 drives the annular push plate 12 to rotate through the worm gear device 2, causing the annular push plate 12 to propel toward the clutch 7 to close the clutch 7, or to retract the annular push plate 12 to disengage the clutch 7. This avoids the use of shift blocks and synchronizer rings that are prone to slippage and wear, and eliminates the need for a complex hydraulic and pneumatic system. Since the drive motor and worm gear device are technologically mature, have low market prices, high control accuracy and stable performance, the drive motor can be placed inside the housing or installed outside the housing when used; the axial propulsion device 1 is set based on the input shaft 8, does not occupy any additional external space, and can have a variety of settings. The structure will be much simpler than the hydraulic cylinder and its pump pressure system, thereby simply and reliably solving the clutch and engagement execution problem of the gear shift clutch mechanism of the transmission.

[0020] The worm 22 is fixed in position. When pushing the annular turbine 21 to rotate around the input shaft 8, the annular turbine 21 slides along its own axial direction relative to the worm 22. In this way, the position of the drive motor 3 is fixed, making it easier to install the drive motor 3 and the worm 22 in a fixed position.

[0021] like Figure 3As shown in FIG. 7 , the axial propulsion device 1 further includes an annular fixed plate 11 which is adjacent to the annular push plate 12 and is sleeved on the input shaft 8. The annular fixed plate 11 is located on the side away from the clutch 7 and is always subjected to the pressure from the clutch. On the side of the annular fixed plate 11 facing the annular push plate 12, at least three arc-shaped rolling grooves 110 are provided at equal intervals. One end of the rolling groove 110 is a deep end 1101 and the other end is a shallow end 1102. The depth of the rolling groove 110 is from shallow to deep. The depth of the second rolling groove 120 gradually changes from shallow to deep end 1101; on the side of the annular push plate 12 facing the annular fixed plate 11, there are equal intervals of rolling grooves 120 equal to the number of rolling grooves 110, one end of the second rolling groove 120 is the deep end 1201, and the other end is the shallow end 1202. The depth of the second rolling groove 120 gradually changes from shallow to deep end 1201, and the direction of the second rolling groove 120 from the shallow end to the deep end is the same as that of the first rolling groove 110 from the shallow end to the deep end. The direction from the shallow end to the deep end is opposite; each rolling groove 110 corresponds to a rolling groove 2 120, and a rolling ball 13 is provided between the corresponding rolling groove 110 and the rolling groove 2 120. When the clutch 7 is in the disengaged state, the deep end 1101 of the rolling groove 110 corresponds to the deep end 2 1201 of the rolling groove 2 120 axially, and the rolling ball 13 is simultaneously located in the deep end 1101 and the deep end 2 1201 and is simultaneously in contact with the deep end 1101 and the deep end 2 120 1; the annular push plate 12 rotates from the deep end 1101 of the rolling groove 110 to the shallow end 1102, or from the shallow end 1102 of the rolling groove 110 to the deep end 1101, and the rolling ball 13 rolls from the deep end 1101 and the deep end 2 1201 to the shallow end 1102 and the shallow end 2 1202, or from the shallow end 1102 and the shallow end 2 1202 to the deep end 1101 and the deep end 2 1201 at the same time. As the balls 13 simultaneously roll from the deep end 1101 of groove 110 and the deep end 1201 of groove 2 120 to the shallow end 1102 of groove 110 and the shallow end 2 1202 of groove 2 120, the gap between the annular fixed plate 11 and the annular push plate 12 gradually widens. With the annular fixed plate 11 remaining axially positioned on the input shaft 8, the annular push plate 12 is forced to move toward the clutch. Furthermore, as the balls 13 simultaneously roll from the shallow end 1102 of groove 110 and the shallow end 2 1202 of groove 2 120 to the deep end 1101 of groove 110 and the deep end 2 1201 of groove 2 120, the gap between the annular fixed plate 11 and the annular push plate 12 gradually narrows under pressure from the clutch 7. With the annular fixed plate 11 remaining axially positioned on the input shaft 8, the annular push plate 12 moves toward the clutch.The above-mentioned rolling ball 13 rolls simultaneously from the deep end 1101 of rolling groove 110 and the deep end 1201 of rolling groove 2 120 to the shallow end 1102 of rolling groove 110 and the shallow end 1202 of rolling groove 2 120, and the rolling ball 13 rolls simultaneously from the shallow end 1102 of rolling groove 110 and the shallow end 1202 of rolling groove 2 120 to the deep end 1101 of rolling groove 110 and the deep end 1201 of rolling groove 2 120, all of which are achieved by the worm 22 rotating forward or reversely to push the annular turbine 21 to rotate forward or reversely.

[0022] A positioning foot 111 is extended from one side of the annular fixed plate 11 . Correspondingly, a positioning groove 101 is provided on the inner wall of the housing 100 of the gearbox. During assembly, the outer end of the positioning foot 111 is inserted into the positioning groove 101 .

[0023] A grinding disc 4 capable of sliding on the input shaft 8 is provided between the clutch 7 and the annular push plate 12. The edge of the grinding disc 4 is inclined toward the friction plate 71 of the annular clutch. The annular push plate 12 pushes the grinding disc 4 so that the friction plate 71 clamps the steel plate 72 of the clutch.

[0024] A return spring 5 is provided between the grinding disc 4 and the clutch 7. When the annular push plate 12 moves back away from the clutch 7, the return spring 5 pushes the grinding disc 4 so that the grinding disc 4 slides against the annular push plate 12.

[0025] A pressure bearing 6 is provided between the annular push plate 12 and the grinding disc 4 to reduce the rotational resistance of the annular push plate 12 while transmitting pressure.

[0026] A lubricating branch oil channel 82 is radially arranged on the input shaft 8 to connect the axial main lubricating oil channel 81 with the pressure bearing 6 to provide lubricating oil to the pressure bearing 6.

[0027] The annular turbine 21 is semi-annular, and its curvature is slightly larger than that of the first rolling groove 110 or the second rolling groove 120 . Example 2

[0028] The difference from Example 1 is that the axial propulsion device 1 includes a shaft outer sleeve fixedly sleeved on the outside of the input shaft 8, which is not shown in the figure. The shaft outer sleeve is provided with an external thread, and a corresponding internal thread is provided in the annular push plate 12. The annular push plate 12 is sleeved on the shaft outer sleeve through threaded cooperation.

[0029] The above embodiments are only used to more clearly describe the present invention and cannot be regarded as limiting the scope of protection covered by the present invention. Any modifications in equivalent forms should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. A propulsion mechanism for pushing a clutch in a gearbox, characterized by: The invention comprises an axial propulsion device (1), a worm gear device (2) and a drive motor (3), wherein the axial propulsion device (1) is arranged on an input shaft (8), and comprises an annular push plate (12) sleeved on the input shaft (8) on a side adjacent to the clutch (7), wherein the annular push plate (12) can perform axial propulsion on the input shaft (8) while rotating around the input shaft. The worm gear device (2) comprises an annular turbine (21) fixed around the outer periphery of the annular push plate (12), and a worm gear (22) meshing with the annular turbine (21) at one end and connected to the drive motor (3) at the other end. When in use, the drive motor (3) drives the annular push plate (12) to rotate through the worm gear device (2), so that the annular push plate (12) is pushed toward the clutch (7) to close the clutch (7), or the annular push plate (12) is retracted to disengage the clutch (7).

2. The propulsion mechanism for pushing the clutch in the gearbox according to claim 1, characterized in that: The worm (22) is fixed in position, and when the annular turbine (21) is pushed to rotate around the input shaft (8), the annular turbine (21) slides relative to the worm (22) along its own axial direction.

3. The propulsion mechanism for pushing the clutch in the gearbox according to claim 1, characterized in that: The axial propulsion device (1) further comprises an annular fixed plate (11) mounted on the input shaft (8) adjacent to the annular push plate (12), the annular fixed plate (11) being located on a side away from the clutch (7) and always receiving pressure from the clutch, and at least three arc-shaped rolling grooves (110) are provided at equal intervals on the side of the annular fixed plate (11) facing the annular push plate (12), one end of the rolling groove (110) being a deep end (1101) and the other end being a shallow end (1102), and the depth of the rolling groove (110) being from the shallow end (1101) to the shallow end (1102). 02) to the deep end one (1101) and gradually becomes deeper from shallow; on the side of the annular push plate (12) facing the annular fixed plate (11), there are equally spaced rolling grooves 2 (120) with the same number as the rolling grooves 1 (110), one end of the rolling grooves 2 (120) is the deep end two (1201), and the other end is the shallow end two (1202), the depth of the rolling grooves 2 (120) gradually becomes deeper from shallow end two (1202) to the deep end two (1201), and the direction of the rolling grooves 2 (120) from the shallow end to the deep end is the same as the direction of the rolling grooves 1 (110) from the shallow end to the deep end The directions are opposite; each rolling groove 1 (110) corresponds to a rolling groove 2 (120), and a rolling ball (13) is provided between the corresponding rolling groove 1 (110) and the rolling groove 2 (120). When the clutch (7) is in the disengaged state, the deep end 1 (1101) of the rolling groove 1 (110) corresponds to the deep end 2 (1201) of the rolling groove 2 (120) in the axial direction, and the rolling ball (13) is simultaneously located in the deep end 1 (1101) and the deep end 2 (1201) and is in contact with the groove bottoms of the deep end 1 (1101) and the deep end 2 (1201). The rotation direction of the annular push plate (12) is from the deep end one (1101) of the rolling groove one (110) to the shallow end one (1102), or from the shallow end one (1102) of the rolling groove one (110) to the deep end one (1101), and the rolling ball (13) simultaneously rolls from the deep end one (1101) and the deep end two (1201) to the shallow end one (1102) and the shallow end two (1202), or from the shallow end one (1102) and the shallow end two (1202) to the deep end one (1101) and the deep end two (1201).

4. The propulsion mechanism for pushing the clutch in the gearbox according to claim 3, characterized in that: A positioning foot (111) is provided on one side of the annular fixed plate (11). During assembly, the outer end of the positioning foot (111) is inserted into a positioning groove (101) provided on the inner wall of the housing (100) of the gearbox.

5. The propulsion mechanism for pushing the clutch in the transmission according to claim 3, characterized in that: A grinding disc (4) capable of sliding on the input shaft (8) is provided between the clutch (7) and the annular push disc (12). The edge of the grinding disc (4) is inclined toward the friction plate (71) of the clutch arranged in an annular manner. The grinding disc (4) is pushed by the annular push disc (12) so that the friction plate (71) clamps the steel plate (72) of the clutch.

6. The propulsion mechanism for pushing the clutch in the transmission according to claim 5, characterized in that: A return spring (5) is provided between the grinding disc (4) and the clutch (7). When the annular push disc (12) moves away from the clutch (7), the return spring (5) pushes the grinding disc (4) so that the grinding disc (4) slides against the annular push disc (12).

7. The propulsion mechanism for pushing the clutch in the transmission according to claim 5, characterized in that: A pressure bearing (6) is provided between the annular push plate (12) and the grinding plate (4).

8. The propulsion mechanism for pushing the clutch in the transmission according to claim 7, characterized in that: A lubricating branch oil passage (82) is radially arranged on the input shaft (8) and connects the central main lubricating oil passage (81) with the pressure bearing (6).

9. The propulsion mechanism for pushing the clutch in the transmission according to claim 1, characterized in that: The axial propulsion device (1) comprises a shaft outer sleeve fixedly sleeved on the outside of the input shaft (8), the shaft outer sleeve is provided with an external thread, the annular push plate (12) is provided with a corresponding internal thread, and the annular push plate (12) is sleeved on the shaft outer sleeve through threaded engagement.

10. The propulsion mechanism for pushing the clutch in the transmission according to claim 1, characterized in that: The annular turbine (21) is semi-annular.

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