Pressure compensation mechanism of spiral spring clutch

Abstract

The utility model discloses a spiral spring clutch pressure compensation mechanism which comprises a clutch cover and a spiral spring and further comprises a pressing device arranged coaxially with the clutch cover, a rack is installed on one side of the upper end of the pressing device and meshed with a transmission gear, and the transmission gear is driven by a motor installed on the clutch cover. A displacement sensor is installed in the middle of the pressing device, a spring groove connected with the spiral spring in a matched mode is formed in the bottom of the pressing device, and the displacement sensor and the motor are connected with a trip computer. Displacement information of the pressure plate in the spiral spring clutch is accurately measured through the displacement sensor, whether pressure compensation is needed or not is judged through the trip computer, when pressure compensation is needed, the trip computer calculates the angle where the motor needs to rotate, the trip computer controls the motor to rotate, and the transmission gear is driven to rotate. And the pressing device is driven to integrally press downwards, so that the deformation quantity of the spiral spring is increased, the compensation of the pressing force of the spiral spring is realized, and the service life of the clutch is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of helical spring clutch pressure compensation mechanism, belong to clutch parts field. BACKGROUND

[0002] At present, the helical spring clutch widely used at home and abroad is mainly composed of a clutch cover, a helical spring and a clutch pressure plate. Its working principle is to use the pressure of the helical spring on the pressure plate to tightly press the driven plate on the flywheel to realize the transmission of power. When the new clutch is installed in place, the helical spring between the clutch cover and the pressure plate is compressed to the designed working length L, and the compression force F meeting the design requirements is applied. During the long-term use of the clutch, the frequent engagement and disengagement cause the gradual wear of the friction plate on the driven plate, the gradual increase of the distance between the clutch cover and the pressure plate, and the gradual elongation of the length of the helical spring and the decrease of the compression amount X. According to the mechanical principle, the compression force F acting on the driven plate is related to the product of the spring stiffness K and the compression amount X, i.e. F = K·X. With the decrease of the compression amount X, the compression force F also decreases linearly. The decrease of the compression force directly affects the transmission torque capacity of the clutch. When the compression force decreases to a certain value, the clutch starts to show the phenomenon of insufficient transmission, which is manifested as slipping, overheating of the friction plate and even burning, etc., eventually leading to the scrap of the clutch.

[0003] At present, there are many patents for pressure compensation modification of the clutch. For example, a patent for a helical spring clutch cover assembly with manual pressure compensation (publication number CN202484124U) provides an adjusting seat outside the clutch cover which can be rotated by a tool. Through the cooperation of the convex ribs on the adjusting seat and the deep and shallow grooves on the clutch cover, the axial movement of the adjusting seat is realized to achieve the purpose of pressure compensation. However, this assembly needs to be manually controlled, which is not convenient, and the movement distance of the adjusting seat is fixed, so it cannot accurately achieve pressure compensation. Another patent for a helical spring clutch with automatic pressure compensation (publication number CN2687410Y) provides a support with an outer diameter smaller than the inner diameter of the helical spring and a central axis at an angle θ with the central axis of the clutch. The helical spring is placed obliquely. With the wear of the friction plate, the axial pressure of the helical spring increases to achieve pressure compensation. However, this device is limited by the fixed mechanical angle and cannot quantify the pressure change, so the precision is not high.

[0004] Therefore, in view of the phenomenon that the compression force decreases due to the wear of the friction plate during the use of the helical spring clutch, which affects the performance and service life of the clutch, it is of great practical significance and application value to research and develop a clutch structure or mechanism that can automatically compensate the compression force. SUMMARY

[0005] The spiral spring clutch pressure compensation mechanism provided by the utility model can avoid the slipping, overheating and even burning of the friction plate caused by the wear of the friction plate, guarantee the performance and service life of the clutch, and has simple structure and convenient use.

[0006] In order to achieve the above object, the utility model discloses a spiral spring clutch pressure compensation mechanism, including clutch cover and spiral spring, still include with the coaxial arrangement of clutch cover Pressure device, the upper end one side of pressure device is installed with rack, the rack is engaged with transmission gear, transmission gear is by the motor drive of installation on clutch cover, the middle part of pressure device is equipped with displacement sensor, and the bottom is equipped with the spring groove that cooperates with spiral spring and is connected, and displacement sensor and motor are connected with car computer respectively.

[0007] As improved, the pressure device includes a first pressure part, a second pressure part and a connecting part, the first pressure part, the second pressure part and the connecting part are all hollow cylindrical and coaxially connected as a whole, the first pressure part is installed at the upper end of the connecting part, and the second pressure part is sleeved on the connecting part.

[0008] As improved, the second pressure part and the connecting part are located inside the clutch cover, and the upper end of the first pressure part extends above the clutch cover.

[0009] As improved, the outer side wall of the first pressure part is provided with the rack arranged along the axial direction.

[0010] As improved, the bottom of the second pressure part is provided with a plurality of spring grooves uniformly arranged along the circumferential direction.

[0011] As improved, the spring groove is a circular groove.

[0012] As improved, the upper surface of the connecting part is flush with the upper surface of the second pressure part, and the height of the connecting part is less than the height of the second pressure part.

[0013] As improved, the bottom of the connecting part is provided with a plurality of sensor mounting grooves uniformly arranged along the circumferential direction.

[0014] Compared with the prior art, the spiral spring clutch pressure compensation mechanism of the utility model accurately determines the displacement information of the pressure plate in the spiral spring clutch through the displacement sensor, and then judges whether pressure compensation is needed through the car computer, when pressure compensation is needed, the angle of motor rotation is calculated through the car computer, the motor is controlled to rotate through the car computer, the transmission gear is driven to rotate, the whole pressure device is pressed down, the deformation amount of the spiral spring is increased, the compensation of the spiral spring pressing force is realized, the pressing force is kept constant, the service life of the clutch is prolonged, and the utility model has the characteristics of simple structure, high automation level and the like. Attached Figure Description

[0015] Figure 1 This is a sectional view of the installation structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the pressing device of this utility model;

[0017] Figure 3 This is a flowchart of the pressure compensation process of this utility model;

[0018] In the figure: 1. Clamping device, 11. First clamping part, 111. Rack, 12. Second clamping part, 121. Spring groove, 13. Connecting part, 131. Sensor mounting groove, 2. Transmission gear, 3. Motor, 4. Displacement sensor, 5. Pressure plate, 6. Friction plate, 7. Helical spring, 8. Clutch cover. Detailed Implementation

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] like Figure 1 , Figure 2 As shown, a helical spring clutch pressure compensation mechanism includes a clutch cover 8, a helical spring 7 and a pressure plate 5. The helical spring 7 is installed between the clutch cover 8 and the pressure plate 5. It also includes a vehicle computer and a clamping device 1 arranged coaxially with the clutch cover 8.

[0021] A rack 111 is installed on one side of the upper end of the clamping device 1. The rack 111 meshes with the transmission gear 2. The transmission gear 2 is driven by the motor 3 installed on the clutch cover 8. A displacement sensor 4 is installed in the middle of the clamping device 1. A spring groove 121 is provided at the bottom to cooperate with the helical spring 7. The displacement sensor 4 and the motor 3 are both connected to the vehicle computer.

[0022] The displacement sensor 4 is used to detect the displacement information of the pressure plate 5 in the helical spring clutch and send the displacement information to the vehicle computer. The vehicle computer is used to determine whether pressure compensation is required. When pressure compensation is required, the vehicle computer controls the motor 3 to drive the transmission gear 2 to rotate. Relying on the meshing transmission of the transmission gear 2 and the rack 111, the clamping device 1 is driven to press down as a whole. When the clamping device 1 is pressed down until the displacement sensor 4 detects that the position of the pressure plate 5 has reached the standard value, the vehicle computer controls the motor 3 to stop rotating.

[0023] As an improvement of the embodiment, as shown in Figure 2 The pressing device 1 comprises a first pressing part 11, a second pressing part 12 and a connecting part 13, all of which are hollow cylindrical, and the first pressing part 11, the second pressing part 12 and the connecting part 13 are coaxially arranged and connected into one body.

[0024] The first pressing part 11 is installed at the upper end of the connecting part 13, the second pressing part 12 is sleeved on the outer periphery of the connecting part 13, the inner hole diameters of the first pressing part 11 and the connecting part 13 are the same, and the inner hole diameter of the second pressing part 12 is larger than that of the connecting part 13. Further, the second pressing part 12 and the connecting part 13 are located inside the clutch cover 8, and the upper end of the first pressing part 11 extends above the clutch cover 8, and the overall structure design is simple.

[0025] As an improvement of the embodiment, as shown in Figure 2 The outer side wall of the first pressing part 11 is provided with a rack 111 arranged in the axial direction, and when the motor 3 drives the transmission gear 2 to rotate, the transmission gear 2 drives the first pressing part 11 to press downward through meshing with the rack 111, and then the second pressing part 12 and the connecting part 13 are synchronously pressed downward.

[0026] As an improvement of the embodiment, as shown in Figure 2 The bottom of the second pressing part 12 is provided with a plurality of circular spring grooves 121 uniformly arranged in the circumferential direction, the diameter of the spring groove 121 matches the outer diameter of the spiral spring 7, the upper end of the spiral spring 7 is stably installed in the spring groove 121, and when the whole pressing device 1 is pressed downward, the second pressing part 12 can press the whole spiral spring 7 downward through the spring groove 121, so that the deformation amount of the spiral spring 7 is increased.

[0027] As an improvement of the embodiment, as shown in Figure 2 The upper surface of the connecting part 13 is flush with the upper surface of the second pressing part 12, which is more convenient to process, and the height of the connecting part 13 is smaller than that of the second pressing part 12, which ensures that the installation position of the displacement sensor 4 meets the use requirement, and ensures that the displacement sensor 4 can accurately measure the displacement information of the pressure plate 5.

[0028] As a further improvement of the embodiment, the bottom of the connecting part 13 is provided with a plurality of sensor installation grooves 131 uniformly arranged in the circumferential direction, which ensures that the displacement sensor 4 installed in the sensor installation groove 131 is parallel to the pressure plate 5, and the displacement information of the pressure plate 5 is more accurate.

[0029] As shown in Figure 3 The working principle of the spiral spring clutch pressure compensation mechanism of the utility model is that:

[0030] The displacement sensor 4 fixed on the bottom surface of the connecting part 13 transmits the displacement information of the pressure plate 5 to the driving computer in real time, and when the displacement sensor 4 detects that the displacement of the pressure plate 5 exceeds the standard value stored in the driving computer, it indicates that the friction plate 6 is worn and pressure compensation is needed; at this time, the driving computer calculates the angle that the motor 3 needs to rotate, and then controls the motor 3 to rotate the corresponding angle, the motor 3 drives the transmission gear 2 to rotate, the transmission gear 2 is engaged with the rack 111 on the first pressing part 11 to drive, thereby realizing the overall pressing of the pressing device 1, and the deformation amount of the spiral spring 7 is increased through the plurality of spring grooves 121 on the second pressing part 12, so as to realize the pressure compensation of the clutch; when the displacement sensor 4 detects that the position of the pressure plate 5 reaches the standard value, the driving computer controls the motor 3 to stop rotating.

[0031] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified to the technical solutions recorded in the foregoing embodiments, or to the equivalent replacement of some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A helical spring clutch pressure compensation mechanism comprising a clutch cover (8) and a helical spring (7), characterized in that, Also include the clutch cover (8) coaxial arrangement of compression device (1), the upper end of the compression device (1) side of the installation of the rack (111), the rack (111) and transmission gear (2) meshing, the transmission gear (2) is driven by the motor (3) installed on the clutch cover (8); the compression device (1) is installed in the middle of the displacement sensor (4), the bottom is provided with spring groove (121) with helical spring (7) cooperation connection, the displacement sensor (4) and motor (3) are connected with the car computer respectively.

2. A helical spring clutch pressure compensation mechanism according to claim 1, wherein The compression device (1) comprises a first compression part (11), a second compression part (12) and a connecting part (13), the first compression part (11), the second compression part (12) and the connecting part (13) are all hollow cylindrical and coaxially connected as a whole, the first compression part (11) is installed at the upper end of the connecting part (13), and the second compression part (12) is sleeved on the connecting part (13).

3. A helical spring clutch pressure compensation mechanism according to claim 2, wherein The second compression part (12) and the connecting part (13) are located inside the clutch cover (8), and the upper end of the first compression part (11) extends above the clutch cover (8).

4. A helical spring clutch pressure compensation mechanism according to claim 2, wherein The outer side wall of the first compression part (11) is provided with the rack (111) arranged in the axial direction.

5. A helical spring clutch pressure compensation mechanism according to claim 2, wherein The bottom of the second compression part (12) is provided with a plurality of spring grooves (121) arranged uniformly in the circumferential direction.

6. A helical spring clutch pressure compensation mechanism according to claim 5, wherein The spring groove (121) is a circular groove.

7. A helical spring clutch pressure compensation mechanism according to claim 2 wherein, The upper surface of the connecting part (13) is flush with the upper surface of the second compression part (12), and the height of the connecting part (13) is less than the height of the second compression part (12).

8. A helical spring clutch pressure compensation mechanism according to claim 7, wherein The bottom of the connecting part (13) is provided with a plurality of sensor mounting grooves (131) arranged uniformly in the circumferential direction.

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