A friction element segmentation device with a spring provided on the tooth portion

Abstract

The present invention aims to provide a friction element segmentation device with a spring disposed on the tooth portion, comprising a shaft, a cylinder, a piston, an end plate, a plate holder, an involute gear ring, and a flange. The cylinder, piston, and end plate are mounted on the exterior of the shaft, the end plate is fixed to the plate holder, a spring is mounted between the plate holder and the piston, a perforated plate and a perforated friction plate are mounted between the end plate and the piston, the perforated plate and the perforated friction plate are spaced apart to form a series of friction pairs, a spiral segmentation spring with a handle is mounted between the perforated plate and the perforated friction plate, and an end plugging plate and a flange are mounted at each end of the involute gear ring. Without increasing the volume and weight of the friction clutch and without changing the overall structure of the existing clutch, the device achieves rapid axial separation and precise positioning of the friction elements after the clutch is disengaged, reduces friction between the friction elements, reduces drag torque and lubricating oil heating, and improves the no-load transmission efficiency of the clutch. The device is particularly suitable for torque reduction modification of an existing clutch.

Description

Technical Field

[0001] The present invention relates to a clutch, in particular to a clutch positioning slicing device. Background Art

[0002] A significant disadvantage of known wet friction clutches, compared to tooth clutches, is the high drag torque generated after clutch disengagement. This drag torque reduces the clutch's no-load transmission efficiency and easily heats the lubricating oil discharged from the clutch, increasing the burden on the clutch's lubrication and cooling system. This disadvantage arises from the following: after a wet friction clutch disengages, one set of friction elements is stationary while the other set rotates. The friction elements are separated and axially positioned by the flow of lubricating oil. The shear flow of lubricating oil between the friction elements generates a significant drag torque. Furthermore, since all friction elements are separated solely by the flow of lubricating oil, reliable axial positioning is not achieved. This results in random, mutually influencing rubbing between the friction elements even when the clutch is disengaged. This manifests as an intermittent increase in drag torque, further increasing power loss after clutch disengagement. Summary of the Invention

[0003] The object of the present invention is to provide a friction element segmentation device with a spring provided on the teeth, which can achieve precise axial positioning of the friction element and reduce the no-load loss of the wet friction clutch without increasing the volume and weight of the wet friction clutch.

[0004] The object of the present invention is achieved like this:

[0005] The present invention provides a friction element segmentation device with a spring arranged on the tooth portion, which is characterized by comprising a shaft, an oil cylinder, a piston, an end plate, a light plate seat, an involute gear ring, and a flange. The oil cylinder, the piston, and the end plate are mounted on the outside of the shaft, the end plate is fixed to the light plate seat, a spring is mounted between the light plate seat and the piston, a perforated light plate and a perforated friction plate are mounted between the end plate and the piston, the perforated light plate and the perforated friction plate are located outside the light plate seat, the perforated light plate and the perforated friction plate are spaced apart from each other to form a series of friction pairs, a volute segmentation spring with a handle is mounted between the perforated light plates, a volute segmentation spring with a handle is mounted between the perforated friction plates, and an end blocking plate and a flange are mounted at both ends of the involute gear ring, respectively.

[0006] The present invention may also include:

[0007] 1. The spiral-wound leaf spring with a handle is formed by rolling an elastic plate into an integral body, and includes a spring handle and a spring body. The spring handle has an opening, and the spring body is a spiral coil.

[0008] 2. The friction plate with holes is provided with external teeth, and the middle part of the external teeth is provided with an external tooth spring mounting hole with a flat bottom blind hole that cooperates with the shank spiral segmented spring; the optical plate with holes is provided with internal teeth, and the middle part of the internal teeth is provided with an internal tooth spring mounting hole with a flat bottom blind hole that cooperates with the shank spiral segmented spring.

[0009] 3. A blocking spring mounting hole that cooperates with the handle spiral segmented spring is opened on the end blocking plate, and a shank flanging hole is opened on the end blocking plate on the other side of the blocking spring mounting hole. The shank flanging hole is connected with the blocking spring mounting hole, is concentric with it and forms a stepped hole. A flanging chamfer is set at the step position where the shank flanging hole and the end blocking spring mounting hole intersect. The inner diameter of the flanging chamfer is the same as the diameter of the end blocking spring mounting hole, and the outer diameter of the flanging chamfer is the same as the diameter of the shank flanging hole.

[0010] 4. Closing ring grooves are provided on both sides of the shank flanging hole, and a closing ring is provided between the shank flanging hole and the closing ring groove.

[0011] 5. Install the spiral-wound segmented spring with handle in the mounting hole of the end plug spring. After the spring handle is inserted into the mounting hole of the end plug spring, expand and flange at the chamfer to form a handle flange. The closing ring closes inward so that the diameter of the handle flange hole is the same as the diameter of the handle flange.

[0012] 6. The flange is matched with the rightmost shank spiral-wound segmented spring through a stopper. The stopper includes a stud, a positioning column, and a stopper body connected in sequence. The outer diameter of the stud is made with a connecting thread and is interference-mounted in the flange. A positioning countersunk hole is provided in the flange. The positioning column cooperates with the positioning countersunk hole for positioning. The rightmost shank spiral-wound segmented spring is pressed on the end face of the stopper body.

[0013] 7. The maximum outer diameter of the shank spiral leaf spring is located inside the tooth profile of the external or internal teeth, and there is a gap with the corresponding tooth profile.

[0014] 8. When the cylinder and piston are engaged, the length of the volute spring with handle is the working height. When the cylinder and piston are disengaged, the length of the volute spring with handle is the preload height. There is a volute gap between the volute coils of the spring body.

[0015] 9. Each outer tooth is provided with an outer tooth spring mounting hole, each inner tooth is provided with an inner tooth spring mounting hole, or some outer teeth are provided with outer tooth spring mounting holes, and some inner teeth are provided with inner tooth spring mounting holes.

[0016] The advantages of the present invention are that, without increasing the volume and weight of the friction clutch and without changing the overall structure of the existing clutch, the friction elements can be quickly separated and accurately positioned axially after the clutch is disengaged, thereby reducing friction between the friction elements, reducing the drag torque and heating of the lubricating oil, and improving the no-load transmission efficiency of the clutch. The present invention is particularly suitable for torque reduction modification of an already running clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a longitudinal cross-sectional view of a prior art wet friction clutch;

[0018] Figure 2 is a transverse cross-sectional view of a prior art wet friction clutch;

[0019] Figure 3 is a longitudinal sectional view of the present invention (clutch engaged state);

[0020] Figure 4 It is a longitudinal sectional view of the present invention (clutch disengaged state);

[0021] Figure 5 Schematic diagram of the distribution position of the spring on the friction plate with holes of the present invention;

[0022] Figure 6 Schematic diagram of the distribution position of springs on the optical sheet with holes of the present invention;

[0023] Figure 7 It is the height comparison of the three elastic states of the tang spiral spring;

[0024] Figure 8 This is the front view of the tang spiral spring;

[0025] Figure 9 yes Figure 8 Projected view to the left;

[0026] Figure 10 yes Figure 8 3D view of

[0027] Figure 11 yes Figure 8 3D view from another perspective;

[0028] Figure 12 yes Figure 3 Enlarged view of point A in the middle;

[0029] Figure 13 yes Figure 3 Enlarged view of point B in the middle;

[0030] Figure 14 yes Figure 4 Enlarged view of point C in the middle;

[0031] Figure 15 yes Figure 4 Enlarged view of point D in the middle;

[0032] Figure 16 is a cross-sectional view of the end plugging plate;

[0033] Figure 17 It is the step 1 of connecting the end plug and the tangled spiral spring (inserting into the mounting hole);

[0034] Figure 18 It is step 2 of connecting the end plugging plate and the spiral spring with handle (the handle is expanded);

[0035] Figure 19 It is step 3 (closing of the mounting hole) to connect the end plugging plate and the tangential spiral spring.

[0036] Figure 20 This is the connection diagram between the stopper and the flange. DETAILED DESCRIPTION

[0037] The present invention will be described in more detail below with reference to the accompanying drawings:

[0038] Combine Figure 1-20 ,exist Figure 1 、 Figure 2 In a conventional wet friction clutch, the internally toothed linings 40 and externally toothed friction linings 30 are arranged alternately to form multiple friction pairs. Each externally toothed friction lining 30 forms a sliding sleeve connection with the involute ring gear 20. The externally toothed friction lining 30 can move axially on the involute ring gear 20 while transmitting torque. The ring gear teeth 22 and the friction lining teeth 32 form a sliding fit with side clearance positioning.

[0039] Each inner-toothed optical disc 40 forms a sliding sleeve tooth connection with the optical disc seat 80. The inner-toothed optical disc 40 can move axially on the optical disc seat 80 while transmitting torque. The optical disc teeth 42 and the optical disc seat teeth 82 also form a sliding fit with tooth side clearance positioning.

[0040] The oil cylinder 60 is rigidly connected to the shaft 70, and the piston 50 can slide axially on the oil cylinder 60 and the shaft 70. The end plate 90 is rigidly connected to the optical disc holder 80 via fasteners. The pressure plate 100 presses the end plate 90 and optical disc holder 80 combination onto the shaft 70 via fasteners. The optical disc holder 80 and the shaft 70 are connected by an involute spline, and the end plate 90 and the shaft 70 are connected by a positioning spigot.

[0041] Multiple springs 110 are positioned between the optical disc holder 80 and the piston 50. Pressurized working oil enters the oil cylinder 60 through the shaft working oil hole 72, pushing the piston 50 to move and compress the friction pair, engaging the clutch and enabling bidirectional power transmission between the flange 10 and the shaft 70. When the working oil pressure is released, the springs 110 push the piston 50 back, relaxing the friction pair and disengaging the clutch. The power transmission between the flange 10 and the shaft 70 is disconnected, and the shaft system containing the flange 10 and the shaft 70 can rotate freely or remain stationary. Lubricating oil enters the optical disc holder 80 through the shaft lubricating oil hole 74 and supplies oil to each friction pair through the oil injection holes of the optical disc holder 80. The lubricating oil flowing through the friction pair flows out of the clutch through the ring gear oil outlet hole 24.

[0042] After the clutch is disengaged, the lubricating oil flowing through the friction pair forms an oil film of a certain thickness, which separates the inner gear light plate 40 and the outer gear friction plate 30 from each other. Since the inner gear light plate 40 and the outer gear friction plate 30 are in a relatively loose state after the clutch is disengaged, their movement state is easily disturbed by external conditions. The oil film thickness between each friction pair is not the same, and friction is very likely to occur, resulting in an increase in the clutch drag torque, heating of the lubricating oil, and lower transmission efficiency.

[0043] exist Figure 3-Figure 4 The present invention discloses a friction element segmented device with a spring disposed on a toothed portion. The device comprises an end plugging plate 600, a stopper 200, a perforated friction plate 300, a perforated optical plate 400, and a handle-mounted spiral segmented spring 500. The disc-shaped perforated friction plates 300 and perforated optical plates 400 are spaced apart to form multiple friction pairs. A handle-mounted spiral segmented spring 500 is disposed between the end plugging plate 600 and the first perforated friction plate 300, between each of the nine perforated friction plates 300 (see figure), and between the last perforated friction plate 300 and the block 200. All perforated optical plates 400 are also disposed between each other.

[0044] When the clutch is in the engaged state, the piston 50 pushes the perforated friction plate 300 and the perforated light plate 400 to be pressed against the end plate 90. Except for the volute spring 500 with a handle installed on the end plug plate 600 which is in a free height state, all other volute springs with a handle 500 are in a working compressed state.

[0045] When the clutch is in the disengaged state, the piston 50 retreats to the initial position under the action of the elastic force of the spring 110, and the handle-mounted spiral-wound segmented spring 500 recovers from the compressed height to the preloaded height. The preloaded force of the handle-mounted spiral-wound segmented spring 500 separates all the perforated friction plates 300 and perforated optical plates 400 from each other, and finally precisely positions all the perforated friction plates 300 and perforated optical plates 400 axially.

[0046] exist Figure 5 、 Figure 6 In the example, the perforated friction plate 300 comprises a metal core plate in the middle and sintered or bonded friction layers on both sides. These friction layers are provided with friction plate oil grooves 34, typically in a cross-shaped grid. When the clutch is engaged, lubricating oil flows out through the friction plate oil grooves 34. When the clutch is disengaged, the lubricating oil flows through the friction pair through the friction plate oil grooves 34 and the disengagement gap between the friction pairs, increasing the oil film thickness. The friction pair oil film is subject to radial centrifugal force and tangential viscous force. After the clutch is disengaged, one end remains stationary while the other continues to rotate at high speed, subjecting the friction pair's oil film to intense shear. Consequently, the viscous force within the oil film, caused by the speed difference, generates a certain drag torque.

[0047] An external tooth spring mounting hole 310 with a flat bottom blind hole is provided in the middle of the external tooth 320 of the perforated friction plate 300 , into which the spring shank 510 of the shank spiral segmented spring 500 can be inserted.

[0048] The middle part of the inner teeth 420 of the light sheet with holes 400 is provided with an inner teeth spring mounting hole 410 of a flat bottom blind hole, and the spring handle 510 of the spiral spring with handle 500 can be inserted into the inner teeth spring mounting hole 410.

[0049] The outer tooth spring mounting holes 310 and the inner tooth spring mounting holes 410 are located in the middle of their respective teeth. Their number can be selected according to the number of shank spiral springs 500 required to separate the friction elements. They can be arranged at intervals of several teeth or continuously on each tooth.

[0050] The spring mounting hole 410 on the perforated optical plate 400 is a flat-bottomed blind hole located in the center of the internal teeth 420. This has no effect on the extrusion strength of the optical plate's internal teeth 420 and minimal impact on the root bending and torsional strength. The external teeth 320 of the perforated friction plate 300, located at the larger diameter of the clutch, experience minimal stress and possess excess strength. Even with the perforations, they still possess sufficient extrusion strength and root bending strength.

[0051] The maximum outer diameter of the shank spiral-wound segmented spring 500 is located inside the tooth profile of the outer teeth 320 and the inner teeth 420, and a certain gap is left with the tooth profile. The gap is used to compensate for the larger diameter space occupied by the shank spiral-wound segmented spring 500 after being deformed by force, the centering processing error of the relative tooth profiles of the outer tooth spring mounting hole 310 and the inner tooth spring mounting hole 410, and the shape error of the shank spiral-wound segmented spring 500 itself. This gap makes the implementation of the patent of the present invention convenient in process, and is particularly suitable for torque reduction modification of the friction elements of an already running clutch.

[0052] exist Figure 7-11 In the embodiment, the spiral-wound spring 500 with a stem consists of a spring shank 510 and a spring body 520. The spring shank 510 and the spring body 520 are formed by rolling a specific elastic sheet material into a single piece. The spring shank 510 can transmit elastic force and support the weight and load of the entire spiral-wound spring 500. The spring shank 510 is not fully enclosed and has an opening, similar to an elastic cotter pin. The shank opening provides the spring shank 510 with radial elasticity. The spring mounting holes on the perforated friction plate 300 and the perforated optical plate 400 are flat-bottomed blind holes. The spring shank 510 of the spiral-wound spring 500 is inserted into the spring mounting hole. The radial elasticity of the shank opening generates a certain friction force with the side wall of the mounting hole, facilitating the attachment and positioning of the spiral-wound spring 500 on the perforated friction plate 300 and the perforated optical plate 400 during assembly.

[0053] There is a scroll gap 530 between each scroll coil of the spring body 520. The scroll gap 530 becomes larger after the handle scroll segmented spring 500 is compressed, and the entire handle scroll segmented spring 500 will occupy a larger diameter space.

[0054] Figure 7 The axial deformation of the shank spiral segmented spring 500 at the free height H0, preload height H1, and working height H2 is compared.

[0055] exist Figure 12-15 In the embodiment, when the clutch is engaged, the length of the volute-wound spring 500 with a handle is the working height H2, and when the clutch is disengaged, the length of the volute-wound spring 500 with a handle is the preload height H1. The volute-wound spring 500 with a handle is in a deformed and compressed state and has sufficient space for further deformation, which can provide a certain elastic restoring force and compensate for the additional compression caused by the reduction in the distance between adjacent friction elements due to wear of the friction elements.

[0056] exist Figure 14 In the embodiment of the present invention, after the clutch is engaged, the piston 50 moves to the right to compress the friction plate group. The distance between the end plug 600 and the first perforated friction plate 30 is greater than the free height H0 of the shank spiral spring 500. Therefore, the shank spiral spring 500 on the end plug 600 must be fixedly connected to prevent it from falling off.

[0057] exist Figure 16 In the middle position of the tooth portion corresponding to the outer teeth 320 of the friction plate with holes 300, a number of end blocking plate spring mounting holes 610 are opened on the end blocking plate 600, and the spring shank 510 of the shank spiral segmented spring 500 can be inserted into the end blocking plate spring mounting hole 610. The shank flange hole 630 is concentric with the end blocking plate spring mounting hole 610 and is half-opened on the other side of the end blocking plate 600. The shank flange hole 630 and the end blocking plate spring mounting hole 610 are combined into a stepped hole.

[0058] A chamfer 620 is formed at the step where the shank flange hole 630 intersects the end plate spring mounting hole 610. The inner diameter of the chamfer 620 is equal to the diameter of the end plate spring mounting hole 610, and the outer diameter of the chamfer 620 is equal to the diameter of the shank flange hole 630. The depth of the shank flange hole 630 is such that, after the spring shank 510 is inserted into the end plate spring mounting hole 610, a sufficient flange height of the spring shank 510 is exposed in the shank flange hole 630. An annular closing groove 640 is located on the same side of the end plate 600 as the shank flange hole 630, concentrically arranged and having the same depth. The material between the closing groove 640 and the shank flange hole 630 forms an annular closing ring 650.

[0059] exist Figure 17-Figure 19 In the process of connecting the end plug 600 and the shank spiral spring 500, the steps are as follows:

[0060] 1. Insert into the mounting hole: Insert the spring handle 510 into the end plug spring mounting hole 610.

[0061] 2. Flaring and flanging: The spring handle 510 is flared and flanging at the flanging chamfer 620 to form a handle flanging 514 .

[0062] The handle flange 514 fits on the flange chamfer 620, and its diameter is larger than the diameter of the spring handle 510, limiting the rightward movement of the handle spiral segmented spring 500.

[0063] 3. Closing: The closing ring 650 closes inward, making the diameter of the handle flange hole 630 smaller than the diameter of the handle flange 514, restricting the leftward movement of the handle spiral spring 500. At this point, the handle spiral spring 500 and the end plug 600 form a fixed connection, preventing the handle spiral spring from falling off.

[0064] exist Figure 20 In the figure, cylindrical stopper 200 is composed of a stud 210, a positioning post 220, and a stopper body 230, all manufactured integrally through machining. The outer diameter of stud 210 is threaded with an interference fit to prevent loosening. The cylindrical positioning post 220 engages with the positioning counterbore in flange 10 to position stopper 200. A hexagonal wrench opening is provided in the center of cylindrical stopper body 230 for rotating stopper 200 for installation and removal.

[0065] The block 200 is rigidly connected to the threaded positioning mounting hole on the flange 10 by means of the stud 210 and the positioning column 220. The end face of the spring body 520 of the shank spiral spring 500 on the last perforated friction plate 300 is pressed against the end face of the block body 230. The length of the block 200 supplements the gap distance between the shank spiral spring 500 on the last perforated friction plate 300 and the original flange 10 of the clutch.

[0066] The present invention relies on the elastic force of a tangent spiral spring 500 connected to an end plate 600 and a friction element to position and separate the friction element. The connection between the friction element and the tangent spiral spring 500 is located in the middle of the friction element's teeth, which does not occupy additional space in the clutch. The added weight is very limited, making it more suitable for optimizing and modifying existing clutches with large drag torques. Compared to other cylindrical helical springs, known tangent springs have a more compact structure, more material involved in deformation during operation, and can provide greater elastic force while occupying the same cylindrical space. The tangent spring 510, which is integrally formed with the spring body 520, makes the tangent spiral spring 500 easier to install and secure than other springs that require guide supports, such as cylindrical helical springs and disc springs.

Claims

1. A friction element segmenting device with a spring provided on the teeth, characterized in that: It includes a shaft, a cylinder, a piston, an end plate, a light plate seat, an involute gear ring, and a flange. The cylinder, the piston, and the end plate are installed on the outside of the shaft. The end plate is fixed to the light plate seat. A spring is installed between the light plate seat and the piston. A perforated light plate and a perforated friction plate are installed between the end plate and the piston. The perforated light plate and the perforated friction plate are located outside the light plate seat. The perforated light plates and the perforated friction plates are arranged at intervals to form a series of friction pairs. A volute split spring with a handle is installed between the perforated light plates. A volute split spring with a handle is installed between the perforated friction plates. An end plugging plate and a flange are installed at both ends of the involute gear ring respectively. The spiral-wound leaf spring with a handle is formed by integrally rolling an elastic plate, and comprises a spring handle and a spring body. The spring handle has an opening, and the spring body is a spiral coil. A blocking plate spring mounting hole is formed on the end blocking plate, the end of which cooperates with the shank spiral segmented spring. A shank flanging hole is formed on the end blocking plate on the other side of the blocking plate spring mounting hole. The shank flanging hole is connected to the blocking plate spring mounting hole, is concentric with the shank flanging hole and forms a stepped hole. A flanging chamfer is provided at the step where the shank flanging hole and the end blocking plate spring mounting hole intersect. The inner diameter of the flanging chamfer is the same as the diameter of the end blocking plate spring mounting hole, and the outer diameter of the flanging chamfer is the same as the diameter of the shank flanging hole. A spiral-wound segmented spring with a handle is installed in the mounting hole of the end plug spring. After the spring handle is inserted into the mounting hole of the end plug spring, the flange is expanded and flanging is formed at the chamfered corner to form a handle flange. The closing ring is closed inward so that the diameter of the handle flange hole is the same as the diameter of the handle flange.

2. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: The friction plate with holes is provided with external teeth, and the middle part of the external teeth is provided with an external tooth spring mounting hole with a flat bottom blind hole that cooperates with the stalk volute segmented spring; the light plate with holes is provided with internal teeth, and the middle part of the internal teeth is provided with an internal tooth spring mounting hole with a flat bottom blind hole that cooperates with the stalk volute segmented spring.

3. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: Closing ring grooves are arranged on both sides of the handle flanging hole, and a closing ring is arranged between the handle flanging hole and the closing ring groove.

4. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: The flange is matched with the rightmost shank spiral-wound segmented spring through a stopper. The stopper includes a stud, a positioning column, and a stopper body connected in sequence. The outer diameter of the stud is provided with a connecting thread and is interference-mounted in the flange. A positioning countersunk hole is provided in the flange. The positioning column cooperates with the positioning countersunk hole for positioning. The rightmost shank spiral-wound segmented spring is pressed on the end face of the stopper body.

5. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: The maximum outer diameter of the shank spiral leaf spring is located inside the tooth profile of the external teeth or the internal teeth, and there is a gap with the corresponding tooth profile.

6. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: When the oil cylinder and the piston are engaged, the length of the volute spring with a handle is the working height. When the oil cylinder and the piston are disengaged, the length of the volute spring with a handle is the preload height. There is a volute gap between the volute coils of the spring body.

7. The friction element segmenting device with a spring provided on the teeth according to claim 1, characterized in that: Each outer tooth is provided with an outer tooth spring mounting hole, each inner tooth is provided with an inner tooth spring mounting hole, or some outer teeth are provided with outer tooth spring mounting holes, and some inner teeth are provided with inner tooth spring mounting holes.

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