Pressing plate bearing

Abstract

The invention belongs to the field of bearing installation, and particularly relates to a pressing plate bearing. In order to prevent a tooth opening from being damaged, the invention discloses a pressing plate bearing. The pressing plate bearing comprises a bearing outer ring and a pressing plate, an annular groove is formed in the bearing outer ring, a protrusion used for being embedded into the annular groove is arranged on the pressing plate, the axial direction of the bearing outer ring is defined as the front-back direction, the pressing plate is installed on the front half portion of the bearing outer ring, a tooth opening is formed by the portion from the front groove wall of the annular groove to the front end of the bearing outer ring, and a buffering elastic structure is installed on the protrusion. The buffering elastic structure is installed on the front side face of the protrusion and / or the face, close to the groove bottom wall of the annular groove, of the protrusion and used for making contact with the front groove wall in an abutting mode. The buffering elastic structure is in contact with the protrusion and the front groove wall, and the buffering elastic structure has elasticity, so that after the protrusion and the front groove wall move by a certain relative displacement, the buffering elastic structure can be adaptively deformed, the force borne by the front groove wall is reduced, and the tooth mouth is prevented from being damaged.

Description

Technical Field

[0001] The invention belongs to the field of bearing installation, and in particular relates to a pressure plate bearing. Background Art

[0002] The pressure plate bearing is one of the important components in the automobile gearbox. The pressure plate bearing includes a bearing body and a pressure plate installed on the outer ring of the bearing body, and a threaded hole is provided on the pressure plate. When installing the pressure plate bearing, the bolt passes through the gearbox housing and is threadedly connected with the threaded hole, thereby installing the pressure plate bearing on the housing.

[0003] In the prior art, the installation and connection methods of the pressure plate and the outer ring of the bearing are divided into the following two categories: The first type is to use an additional fixed structure to install the pressure plate on the outer ring of the bearing. Representatives of this type of installation and connection methods are: (1) A Chinese utility model patent with a grant announcement number of CN205136362U and a grant announcement date of April 6, 2016, entitled "Ball bearing with baffle plate". In this patent, the baffle plate (i.e., pressure plate) is mounted on the outer ring of the bearing through a retaining ring; (2) Chinese invention patent application with application publication number CN112901665A, application publication date 2021.06.04, and titled "Rolling bearing device with rotatable bearing pressure plate", in which the bearing pressure plate (i.e., pressure plate) is mounted on the outer ring of the bearing through a clamping ring, and the clamping ring is preferably a rubber ring; (3) A Chinese invention patent with a grant announcement number of CN113464571B and a grant announcement date of October 21, 2022, entitled “Snap-on pressure plate bearing unit”, in which the pressure plate is mounted on the outer ring of the bearing by a snap ring with a snap claw and an annular snap protrusion; (4) Chinese invention patent application with application publication number CN114791017A, application publication date 2022.07.26, and titled “Bearing unit and method for assembling a bearing unit”, in which a pressure plate is mounted on the outer ring of the bearing through a sliding member and a locking member; (5) A Chinese utility model patent with the authorization announcement number CN206072305U, the authorization announcement date 2017.04.05, and the name of which is a connection structure between a bearing and a pressure plate for a vehicle transmission. In this patent, the pressure plate is installed on the outer ring of the bearing through a retaining spring with a buckle; (6) A Chinese utility model patent with a grant announcement number of CN215257375U and a grant announcement date of December 21, 2021, entitled "pressure plate bearing", in which the pressure plate is mounted on the outer ring of the bearing by a retaining spring with a retaining protrusion; (7) Chinese utility model patent with authorization announcement number CN215861374U, authorization announcement date 2022.02.18, and titled "pressure plate bearing unit with three-point raised snap ring connection", in which the pressure plate is mounted on the outer ring of the bearing through a three-point raised snap ring; (8) Chinese utility model patent with authorization announcement number CN220037280U, authorization announcement date 2023.11.17, and name "A rolling bearing device with a rotatable bearing pressure plate". In this patent, the pressure plate is installed on the outer ring of the bearing through a clamping hoop.

[0004] The second type is a special connection structure set on the pressure plate itself, and the pressure plate is directly installed on the outer ring of the bearing. Representatives of this type of installation and connection methods are: (1) A Chinese invention patent application with application publication number CN113107967A, application publication date 2021.07.13, and titled "Bearing assembly", in which a protrusion is provided on the pressure plate, and an annular mounting groove and a recess are provided on the outer ring of the bearing, and the protrusion can be snapped into the annular mounting groove along the recess to mount the pressure plate on the outer ring of the bearing; (2) A Chinese invention patent application with application publication number CN117515048A, application publication date 2024.02.06, and name bearing assembly, in which a first protrusion is provided on the pressure plate, and an annular mounting groove and a recess are provided on the outer ring of the bearing. The first protrusion can be engaged into the annular mounting groove along the recess to mount the pressure plate on the outer ring of the bearing. A second protrusion is also provided on the outer ring of the bearing. The second protrusion is used to limit the relative rotation angle between the outer ring of the bearing and the pressure plate to prevent the first protrusion from aligning with the recess and exiting the annular mounting groove; (3) A Chinese utility model patent with the authorization announcement number CN203570993U and the authorization announcement date April 30, 2014, entitled "Bearing and pressure plate connection device". In this patent, a guide cone and an annular groove are provided on the outer ring of the bearing, and an annular boss for embedding in the annular groove is provided on the pressure plate. When the pressure plate is installed, the annular boss enters the annular groove through the guide cone, and the annular boss and the annular groove have a clearance fit. On the one hand, the pressure plate can rotate relative to the outer ring of the bearing; on the other hand, the annular boss is embedded in the annular groove, which can prevent the annular boss from easily withdrawing from the annular groove, thereby preventing the pressure plate from easily separating from the outer ring of the bearing; In the above-mentioned first type of installation and connection method between the pressure plate and the outer ring of the bearing, an additional fixing structure is required, which is complex in structure and troublesome to install.

[0005] For the installation and connection method of the second type of pressure plate and the bearing outer ring: In the Chinese invention patent application with application publication number CN113107967A, the protrusion (equivalent to the first protrusion in the Chinese invention patent application with application publication number CN117515048A) is easy to withdraw from the annular mounting groove from the recess, causing the pressure plate to easily detach from the outer ring of the bearing; In the Chinese invention patent application with application publication number CN117515048A, although the second protrusion can prevent the pressure plate from being separated from the outer ring of the bearing, the bearing assembly includes two protrusions at the same time, resulting in a more complicated structure. During installation, the two protrusions, the installation groove and the recess need to cooperate with each other, which makes the installation more troublesome. In the Chinese utility model patent with authorization announcement number CN203570993U, the pressure plate bearing has a simple structure and is easy to install. However, when the pressure plate is installed together with the gearbox housing by bolts, the pressure of the bolts on the pressure plate is uneven, and the pressure plate will be deformed under the action of the bolts, resulting in the groove side wall of the annular groove being in top pressure contact with the annular boss, and there is a large initial force between the groove side wall and the annular boss.

[0006] The axial direction of the outer ring of the bearing is defined as the front-to-back direction, the pressure plate is installed on the front half of the outer ring of the bearing, and the front groove wall of the annular groove to the front end of the outer ring of the bearing constitutes the tooth joint. When the gearbox is working, there will be relative movement between the outer ring of the bearing and the pressure plate. Since the wall thickness of the tooth joint is thin, and there is a large initial force between the tooth joint and the annular boss, the tooth joint is easily damaged by the annular boss when the gearbox is working. After the tooth joint is damaged, the debris generated during the damage process will enter the gearbox, affecting the normal operation of the gearbox, and in severe cases, causing the gearbox to fail.

[0007] To solve the above problems, a Chinese invention patent with authorization announcement number CN106460938B and authorization announcement date 2019.06.18 discloses a bearing device and a fixing plate for a bearing device. In the bearing device, a through hole is provided on the pressure plate for reducing the stiffness of the pressure plate, and a thinner arm is formed near the through hole. When the pressure plate bearing is installed by bolts, the arm is actively deformed, thereby reducing the displacement of the relative movement between the crushing part (equivalent to the boss) and the engaging groove (equivalent to the annular groove), and reducing the initial force between the teeth of the engaging groove and the crushing part.

[0008] However, in the above-mentioned Chinese invention patent, the shape, size and position of the through hole need to be carefully designed, and the threaded holes, through holes and mounting holes for matching with the outer ring of the bearing need to be processed on the pressure plate at the same time, resulting in high difficulty in processing the pressure plate. Summary of the invention

[0009] The object of the present invention is to provide a pressure plate bearing to simultaneously solve the technical problems of easy damage to the teeth of the ring groove and high difficulty in processing the pressure plate.

[0010] To achieve the above purpose, the technical solution of the pressure plate bearing provided by the present invention is: A pressure plate bearing comprises a bearing outer ring and a pressure plate installed on the bearing outer ring, the bearing outer ring is provided with an annular groove, the pressure plate is provided with a protrusion for embedding in the annular groove, the axial direction of the bearing outer ring is defined as the front-to-back direction, the pressure plate is installed on the front half of the bearing outer ring, and the part from the front groove wall of the annular groove to the front end of the bearing outer ring constitutes a tooth mouth, a buffer elastic structure is installed on the protrusion, the buffer elastic structure is installed on the front side surface of the protrusion and / or on the side of the protrusion close to the bottom wall of the annular groove, and the buffer elastic structure is used to contact with the front groove wall to reduce the force between the protrusion and the tooth mouth.

[0011] Furthermore, a groove bottom straightening elastic structure is installed on the side of the groove bottom wall of the protrusion close to the annular groove, and the thickness of the groove bottom straightening elastic structure satisfies: before the pressure plate is deformed, the groove bottom straightening elastic structure and the groove bottom wall clearance match; when the pressure plate is deformed under the action of the bolt, the groove bottom straightening elastic structure is used to contact with the groove bottom wall with top pressure.

[0012] Furthermore, the inner diameter of the front end of the groove bottom straightening elastic structure is small; before the pressure plate is deformed, the angle between the extended surface of the groove bottom straightening elastic structure close to the groove bottom wall and the groove bottom wall is r satisfy: , or, before the pressure plate is deformed, the angle between the extended surface of the groove bottom straightening elastic structure close to the groove bottom wall and the extended surface of the groove bottom wall r satisfy: .

[0013] Furthermore, a rear straightening elastic structure is installed on the rear side surface of the protrusion, and the rear straightening elastic structure is used for pressing contact with the rear groove wall of the annular groove.

[0014] Furthermore, the pressure plate includes a straightening portion located behind the protrusion. Before the pressure plate is deformed, the straightening portion is in clearance fit with the outer circumference of the bearing outer ring. After the pressure plate is deformed, the straightening portion is in pressure contact with the outer circumference of the bearing outer ring.

[0015] Furthermore, the buffer elastic structure, the groove bottom straightening elastic structure and the rear straightening elastic structure are integrally formed to form a complete elastic part, and the elastic part is divided into a front part, a rear part and a connecting part connecting the front part and the rear part, the front part constitutes the buffer elastic structure, the connecting part constitutes the groove bottom straightening elastic structure, and the rear part constitutes the rear straightening elastic structure; or, the buffer elastic structure, the groove bottom straightening elastic structure and the rear straightening elastic structure are respectively composed of different elastic parts.

[0016] Furthermore, the thicknesses of the buffer elastic structure, the groove bottom righting elastic structure and the rear righting elastic structure decrease in sequence.

[0017] Furthermore, the minimum inner diameter of the protrusion is smaller than the maximum outer diameter of the thread opening.

[0018] Furthermore, the protrusion is an annular protrusion.

[0019] The beneficial effects of the pressure plate bearing provided by the present invention are as follows: the present invention is an improved invention. Compared with the prior art, the pressure plate bearing in the present invention includes a buffer elastic structure arranged on the protrusion. In the prior art, the front groove wall is in rigid contact with the protrusion, while in the present invention, the buffer elastic structure is in contact with the protrusion and the front groove wall respectively. Since the buffer elastic structure is elastic, after the protrusion and the front groove wall move a certain relative displacement, the buffer elastic structure can be deformed adaptively, thereby reducing the force on the front groove wall and avoiding the damage of the teeth. At the same time, since it is not necessary to process a through hole on the pressure plate, the processing difficulty of the pressure plate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a first specific implementation mode of the pressure plate bearing of the present invention; Figure 2 for Figure 1 A magnified view of the structure at center A; Figure 3 for Figure 2 Dimensional diagram of the middle part structure; Figure 4 It is a structural schematic diagram of the first specific implementation mode of the pressure plate bearing of the present invention after being installed on the box body; Figure 5 It is a structural schematic diagram of the annular groove in the second specific implementation manner of the pressure plate bearing of the present invention; Figure 6 It is a structural schematic diagram of the ring groove in the third specific implementation mode of the pressure plate bearing of the present invention; Figure 7 It is a structural schematic diagram of the ring groove in the fourth specific implementation mode of the pressure plate bearing of the present invention; Figure 8 It is a structural schematic diagram of the ring groove in the fifth specific implementation manner of the pressure plate bearing of the present invention; Fig. 9 It is a structural schematic diagram of the ring groove in the sixth specific implementation manner of the pressure plate bearing of the present invention; Fig.10 It is a structural schematic diagram of a seventh specific implementation manner of a pressure plate bearing of the present invention; Fig.11 for Fig.10 A magnified view of the structure at point B.

[0021] Description of reference numerals: 1. Pressing plate; 11. Threaded hole; 12. Protrusion; 13. Straightening portion; 21. Buffering elastic structure; 22. Groove bottom straightening elastic structure; 23. Rear straightening elastic structure; 3. Bearing outer ring; 31. Ring groove; 32. Thread mouth; 33. Groove bottom wall; 34. Rear groove wall; 4. Bolt; 5. Box body. DETAILED DESCRIPTION

[0022] It should be noted that in the present invention, in order to facilitate the description of the positional relationship between the various components, the axial direction of the outer ring of the bearing is defined as the front-to-back direction, but this does not mean that the axial direction of the outer ring of the bearing is perpendicular to the vertical direction in the actual product. In the actual product, the axial direction of the outer ring of the bearing may be perpendicular to the vertical direction, or parallel to the vertical direction, or form an angle not equal to 90° with the vertical direction.

[0023] In order to solve the problems in the background technology, the core inventive concept of the present invention is: when the relative displacement between the tooth mouth and the protrusion remains unchanged, a buffer elastic structure is used to reduce the force between the protrusion and the tooth mouth, thereby avoiding damage to the tooth mouth.

[0024] The present invention is further described in detail below in conjunction with embodiments.

[0025] The specific embodiment of the pressure plate bearing provided by the present invention is as follows: like Figures 1 to 11 As shown, as the first type of basic specific implementation method, the pressure plate bearing includes a bearing outer ring 3 and a pressure plate 1 installed on the bearing outer ring 3, the bearing outer ring 3 is provided with an annular groove 31, and the pressure plate 1 is provided with a protrusion 12 for embedding into the annular groove 31. The axial direction of the bearing outer ring 3 is defined as the front-to-back direction, the pressure plate 1 is installed on the front half of the bearing outer ring 3, and the front groove wall of the annular groove 31 to the front end of the bearing outer ring 3 constitutes a tooth mouth 32, and a buffer elastic structure 21 is installed on the protrusion 12, which is used to press and contact with the front groove wall to reduce the force between the protrusion 12 and the tooth mouth 32.

[0026] In the specific implementation of Class 1-1, if Figure 7 As shown, the buffer elastic structure 21 is a separate elastic member, preferably an elastic pad, an elastic block, or a plurality of elastic rods arranged at intervals.

[0027] In the specific implementation of Class 1-1-1, if Figure 7 As shown, the buffer elastic structure 21 is installed on the front side of the protrusion 12.

[0028] In the specific implementation of Class 1-1-2, if Figure 8 As shown, the annular groove 31 has a groove bottom wall 33 , and the buffer elastic structure 21 is installed on a surface of the protrusion 12 close to the groove bottom wall 33 .

[0029] In the specific implementation of Class 1-1-3, if Fig. 9 As shown, the buffer elastic structure 21 is installed on the front side of the protrusion 12 and the side of the protrusion 12 close to the groove bottom wall 33 at the same time.

[0030] In the specific implementation of Class 1-2, if Figures 1 to 6 and Figures 10-11 As shown, the buffer elastic structure 21 is a part of the elastic member, and the elastic member is preferably an elastic pad or an elastic block. The material of the elastic member can be selected from commonly used materials such as rubber.

[0031] Among them, the elastic member can be installed on the protrusion 12 by bonding or clamping. Similarly, the groove bottom straightening elastic structure 22 and the rear straightening elastic structure 23 in the following text can also be structures such as elastic pads or elastic blocks, and the groove bottom straightening elastic structure 22 and the rear straightening elastic structure 23 can also be installed on the protrusion 12 by clamping or bonding. The means of installing the elastic member on the object (i.e., the protrusion 12) is a prior art and will not be repeated here.

[0032] Compared with the prior art, the pressure plate bearing in the present invention includes a buffer elastic structure 21 arranged on the front side of the protrusion 12. In the prior art, the front groove wall is in rigid contact with the protrusion 12, while in the present invention, the buffer elastic structure 21 is in contact with the protrusion 12 and the front groove wall respectively. Since the buffer elastic structure 21 is elastic, after the protrusion 12 and the front groove wall move a certain relative displacement, the buffer elastic structure 21 can be deformed adaptively, thereby reducing the force on the front groove wall and avoiding the damage of the tooth 32. At the same time, since it is not necessary to process a through hole on the pressure plate 1, the processing difficulty of the pressure plate 1 is low.

[0033] like Figures 1 to 4 As shown, the pressure plate 1 is provided with a threaded hole 11. When the pressure plate bearing is installed on the housing 5 of the gearbox, the bolt 4 needs to be threadedly connected with the threaded hole 11. After the bolt 4 is threadedly connected with the threaded hole 11, as shown in FIG. Figure 4 As shown, the housing 6 (generally made of aluminum alloy, but other materials can be selected according to actual needs) and the pressure plate 1 (generally made of steel, but other materials can be selected according to actual needs) will deform under the action of the bolt 4, resulting in a closer distance between the front groove wall and the protrusion 12, that is, the compression amount of the buffer elastic structure 21 is large, resulting in a large pressure on the thread 32. In order to further reduce the pressure on the thread 32, on the basis of the first type of basic specific implementation, the present invention designs a straightening structure for straightening the pressure plate 1: like Figures 1 to 4As shown, in the second specific embodiment, a groove bottom straightening elastic structure 22 is installed on the side of the groove bottom wall 33 of the annular groove 31 near the protrusion 12, and the thickness of the groove bottom straightening elastic structure 22 satisfies: before the pressure plate 1 is deformed, the groove bottom straightening elastic structure 22 and the groove bottom wall 33 are clearance-matched; when the pressure plate 1 is deformed under the action of the bolt 4, the groove bottom straightening elastic structure 22 is used to press and contact with the groove bottom wall 33. The groove bottom straightening elastic structure 22 constitutes the straightening structure.

[0034] On the one hand, before the bolt 4 is threadedly connected to the threaded hole 11 (i.e., before the pressure plate 1 is deformed), the groove bottom straightening elastic structure 22 and the groove bottom wall 33 are in clearance fit, so that it is convenient for the staff to rotate the pressure plate 1 and align the threaded hole 11 with the bolt 4; on the other hand, after the bolt 4 is threadedly connected to the threaded hole 11 (i.e., after the pressure plate 1 is deformed under the action of the bolt 4), the groove bottom straightening elastic structure 22 and the groove bottom wall 33 are in top pressure contact, and the groove bottom straightening elastic structure 22 provides elastic force to the pressure plate 1, which is used to overcome a part of the force of the bolt 4 on the pressure plate 1, thereby reducing the deformation of the pressure plate 1 and further reducing the pressure on the tooth 32. At the same time, after the pressure plate 1 is fixed by a circle of bolts 4, the deformation of the groove bottom straightening elastic structure 22 at different positions is different.

[0035] Compared with the technical solution in which the groove bottom straightening elastic structure 22 is not installed on the protrusion 12, when the groove bottom straightening elastic structure 22 is installed on the protrusion 12, the inner diameter of the protrusion 12 is larger, and when the pressure plate 1 is installed on the bearing outer ring 3, the groove bottom straightening elastic structure 22 can be deformed, thereby reducing the difficulty of installation. After the pressure plate 1 is installed on the bearing outer ring 3, the groove bottom straightening elastic structure 22 can automatically reset, thereby making it more difficult for the groove bottom straightening elastic structure 22 and the protrusion 12 to exit the annular groove 31.

[0036] In addition, before the pressing plate 1 is deformed, there is a gap between the groove bottom straightening elastic structure 22 and the groove bottom wall 33. When the groove bottom straightening elastic structure 22 is heated and expanded, the gap can provide space for the expansion of the groove bottom straightening elastic structure 22. Compared with the technical solution without reserving a gap, after the pressing plate 1 is deformed, since the gap is reserved, the expansion space of the groove bottom straightening elastic structure 22 is still large.

[0037] like Figure 6 As shown, in the third embodiment, a rear straightening elastic structure 23 is installed on the rear side of the protrusion 12, and the rear straightening elastic structure 23 is used to press and contact with the rear groove wall 34 of the annular groove 31, and the rear straightening elastic structure 23 constitutes the straightening structure. At this time, the rear straightening elastic structure 23 provides elastic force to the pressing plate 1, and the elastic force is used to overcome the force of a part of the bolts 4 on the pressing plate 1, thereby reducing the deformation of the pressing plate 1 and further reducing the pressure on the thread 32.

[0038] like Fig.10As shown, in the fourth specific implementation manner, the pressure plate 1 includes a straightening portion 13 located behind the protrusion 12. Before the pressure plate 1 is deformed, the straightening portion 13 is clearance-matched with the outer peripheral surface of the bearing outer ring 3. After the pressure plate 1 is deformed, the straightening portion 13 is pressed into contact with the outer peripheral surface of the bearing outer ring 3, and the straightening portion 13 constitutes the straightening structure.

[0039] like Fig.11 As shown, the difference between the inner diameter of the front end of the pressing plate 1 and the inner diameter of the straightening portion 13 is d. In different specific embodiments, d It can be 0 or other values. In this embodiment, the gap between the straightening portion 13 and the outer peripheral surface of the bearing outer ring 3 is preferably 0.2-0.5 mm, for example, 0.2 mm, 0.3 mm or 0.5 mm. Those skilled in the art can also set the gap between the straightening portion 13 and the outer peripheral surface of the bearing outer ring 3 to 0.1 mm, 0.6 mm or other values ​​according to actual conditions.

[0040] On the one hand, before the bolt 4 is threadedly connected to the threaded hole 11 (i.e., before the pressure plate 1 is deformed), the straightening portion 13 is in clearance fit with the outer peripheral surface of the bearing outer ring 3, thereby facilitating the staff to rotate the pressure plate 1 and align the threaded hole 11 with the bolt 4; on the other hand, after the bolt 4 is threadedly connected to the threaded hole 11 (i.e., after the pressure plate 1 is deformed under the action of the bolt 4), the straightening portion 13 is in pressure contact with the outer peripheral surface of the bearing outer ring 3, thereby limiting the further deformation of the pressure plate 1, making the pressure plate 1 and the outer peripheral surface of the bearing outer ring 3 have better verticality, reducing the deformation of the pressure plate 1, and further reducing the pressure on the thread mouth 32.

[0041] In a preferred specific embodiment of type 4-1, the pressure plate bearing includes a groove bottom straightening elastic structure 22, a rear straightening elastic structure 23 and a straightening portion 13 at the same time.

[0042] In the 4-2 type of specific implementation, the pressure plate bearing may also only include the straightening portion 13.

[0043] Correspondingly, in the specific implementation manner of category 2-1, the pressure plate bearing may also only include the groove bottom straightening elastic structure 22.

[0044] In the 2-2 type of specific implementation, the pressure plate bearing may also include a groove bottom straightening elastic structure 22 and a straightening portion 13 at the same time.

[0045] In the 3-1 type of specific implementation, the pressure plate bearing may also only include the rear stabilizing elastic structure 23.

[0046] In the 3-2 type of specific implementation, the pressure plate bearing may also include a groove bottom straightening elastic structure 22 and a rear straightening elastic structure 23 at the same time.

[0047] Of course, in the specific implementation modes of categories 1 to 3, the pressure plate bearing may not include a straightening structure for straightening the pressure plate 1.

[0048] In order to reduce the influence of the deformation of the pressing plate 1 on the trough bottom straightening elastic structure 22 and prevent the trough bottom straightening elastic structure 22 from being over-extruded, on the basis of the second specific implementation manner, the present invention further improves the shape of the trough bottom straightening elastic structure 22 as follows: In the preferred fifth embodiment, the inner diameter of the front end of the groove bottom straightening elastic structure 22 is smaller; before the pressure plate 1 is deformed, the angle between the extended surface of the groove bottom straightening elastic structure 22 close to the groove bottom wall 33 and the groove bottom wall 33 is r satisfy: , or, before the pressure plate 1 is deformed, the angle between the extended surface of the groove bottom straightening elastic structure 22 close to the groove bottom wall 33 and the extended surface of the groove bottom wall 33 is r satisfy: .

[0049] like Figure 4 As shown, after the bolt 4 is threadedly matched with the threaded hole 11, the angle between the deformed pressing plate 1 and the initial position of the pressing plate 1 is R , R The size of is determined by the material of the pressure plate 1, the preload force of the bolt 4 and other parameters. Figures 4 and 5 As shown, by setting the angle r When the pressing plate 1 is deformed, the deformation of the groove bottom straightening elastic structure 22 can be reduced, thereby preventing the groove bottom straightening elastic structure 22 from being over-compressed.

[0050] In the sixth embodiment, the groove bottom straightening elastic structure 22 may also be a circular elastic structure. In this case, the inner diameter of the groove bottom straightening elastic structure 22 is the same everywhere, and the inner diameter is equal to the maximum inner diameter of the groove bottom straightening elastic structure 22 in the fifth embodiment.

[0051] In the specific embodiment in which the pressure plate bearing includes a buffering elastic structure 21, a groove bottom straightening elastic structure 22 and a rear straightening elastic structure 23, in order to simplify the structure, in the preferred 7th type of specific embodiment, the buffering elastic structure 21, the groove bottom straightening elastic structure 22 and the rear straightening elastic structure 23 are integrally formed to form a complete elastic part, and the elastic part is divided into a front part, a rear part and a connecting part connecting the front part and the rear part, the front part constitutes the buffering elastic structure 21, the connecting part constitutes the groove bottom straightening elastic structure 22, and the rear part constitutes the rear straightening elastic structure 23, and the structure is simple.

[0052] However, in the eighth embodiment, the buffer elastic structure 21, the groove bottom straightening elastic structure 22 and the rear straightening elastic structure 23 may also be respectively composed of different elastic parts. In this case, the three elastic parts need to be installed on the protrusion 12 in three times.

[0053] In the specific implementation manner in which the pressure plate bearing includes a buffering elastic structure 21, a groove bottom straightening elastic structure 22 and a rear straightening elastic structure 23, in order to better prevent the tooth gap 32 from being damaged, in the preferred 9th category of specific implementation manner, the thicknesses of the buffering elastic structure 21, the groove bottom straightening elastic structure 22 and the rear straightening elastic structure 23 are successively reduced. Since the groove width of the annular groove 31 is constant, when the thickness of the rear straightening elastic structure 23 is the smallest, the thickness of the buffering elastic structure 21 is the largest, thereby better preventing the tooth gap 32 from being damaged.

[0054] In the tenth type of specific implementation manner, the buffer elastic structure 21 , the groove bottom centralizing elastic structure 22 and the rear centralizing elastic structure 23 have the same thickness.

[0055] In the worst 11th type of specific implementation, the thicknesses of the buffer elastic structure 21, the groove bottom centralizing elastic structure 22 and the rear centralizing elastic structure 23 increase in sequence.

[0056] In this embodiment, the size of the protrusion 12 is defined as follows: In the preferred twelfth embodiment, the minimum inner diameter of the protrusion 12 is smaller than the maximum outer diameter of the thread opening 32 .

[0057] In the specific implementation of Class 12-1, if Figure 3 As shown, the inner diameter of the protrusion 12 is d 1. The inner diameter of the bottom straightening elastic structure 22 is d 2. The maximum outer diameter of the thread 32 is D 1, the outer diameter corresponding to the groove bottom wall 33 is D 2. Preferably, , The depth of the annular groove 31 is not less than 0.5 mm, and the thickness of the groove bottom straightening elastic structure 22 is not less than 0.15 mm, so as to facilitate the installation of the pressure plate 1 on the bearing outer ring 3, prevent the pressure plate 1 from falling off the bearing outer ring 3 and ensure that the pressure plate 1 can rotate relative to the bearing outer ring 3 before deformation.

[0058] Of course, in other specific implementations, the protrusion 12, the groove bottom straightening elastic structure 22, the tooth gap 32 and the annular groove 31 can also be arranged according to actual needs.

[0059] In the twelfth specific implementation manner, a guiding slope may be further provided on the thread opening 32 to facilitate installation of the pressure plate 1 on the bearing outer ring 3 .

[0060] When the pressure plate bearing includes the groove bottom straightening elastic structure 22, in the 13th specific implementation, the minimum inner diameter of the protrusion 12 is greater than the maximum outer diameter of the thread opening 32, and the minimum inner diameter of the groove bottom straightening elastic structure 22 is smaller than the maximum outer diameter of the thread opening 32. In this case, the thread opening 32 may not be provided with a guiding inclined surface.

[0061] Compared with the 13th embodiment, the protrusion 12 in the 12th embodiment is less likely to fall out of the annular groove 31 .

[0062] In this embodiment, the protrusion 12 is defined as follows: In the preferred 14th embodiment, the protrusion 12 is an annular protrusion, so as to balance the force between the annular protrusion and the tooth opening 32 and better prevent the tooth opening 32 from being damaged.

[0063] In a fifteenth embodiment, the protrusions 12 are arc-shaped protrusions, and a plurality of arc-shaped protrusions (3, 4 or more) are evenly spaced along the same circumference.

[0064] Although the 15th specific implementation is not as good as the 14th specific implementation, compared with the prior art without the buffer elastic structure 21, the pressure plate bearing in the 15th specific implementation can also avoid the tooth mouth 32 from being damaged, thus meeting the use requirements.

[0065] It should be noted that the present invention only classifies the specific embodiments according to specific features, which does not mean that other categories do not contain this specific feature. For example, the structure of the first category of specific embodiments may be the same as that of the second or third category of specific embodiments.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions recorded in the aforementioned embodiments without creative work, or to replace some of the technical features therein with equivalents, or to organically combine different types of specific implementations, thereby combining the attached Figures 1 to 11 The seven specific implementation methods are given in the specification. Of course, those skilled in the art can also combine the specific implementation methods not given in the other drawings of the specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure plate bearing, comprising a bearing outer ring and a pressure plate mounted on the bearing outer ring, the bearing outer ring is provided with an annular groove, the pressure plate is provided with a protrusion for embedding into the annular groove, the axial direction of the bearing outer ring is defined as the front-back direction, the pressure plate is mounted on the front half of the bearing outer ring, and the front groove wall of the annular groove to the front end of the bearing outer ring constitutes a thread opening, characterized in that: A buffer elastic structure is installed on the protrusion, and the buffer elastic structure is installed on the front side surface of the protrusion and / or the side of the protrusion close to the bottom wall of the annular groove. The buffer elastic structure is used to press against the front groove wall to reduce the force between the protrusion and the tooth mouth.

2. The pressure plate bearing according to claim 1, characterized in that: A groove bottom straightening elastic structure is installed on the side of the groove bottom wall of the protrusion close to the annular groove, and the thickness of the groove bottom straightening elastic structure meets the following requirements: before the pressure plate is deformed, the groove bottom straightening elastic structure and the groove bottom wall clearance match; when the pressure plate is deformed under the action of the bolt, the groove bottom straightening elastic structure is used to contact with the groove bottom wall with top pressure.

3. The pressure plate bearing according to claim 2, characterized in that: The inner diameter of the front end of the groove bottom straightening elastic structure is small; before the pressure plate is deformed, the angle between the extended surface of the groove bottom straightening elastic structure close to the groove bottom wall and the groove bottom wall is r satisfy: , or, before the pressure plate is deformed, the angle between the extended surface of the groove bottom straightening elastic structure close to the groove bottom wall and the extended surface of the groove bottom wall r satisfy: .

4. The pressure plate bearing according to claim 2 or 3, characterized in that: A rear straightening elastic structure is installed on the rear side surface of the protrusion, and the rear straightening elastic structure is used for pressing contact with the rear groove wall of the annular groove.

5. The pressure plate bearing according to claim 4, characterized in that: The pressure plate includes a straightening portion located behind the protrusion. Before the pressure plate is deformed, the straightening portion is in clearance fit with the outer peripheral surface of the bearing outer ring. After the pressure plate is deformed, the straightening portion is in pressure contact with the outer peripheral surface of the bearing outer ring.

6. The pressure plate bearing according to claim 4, characterized in that: The buffer elastic structure, the groove bottom straightening elastic structure and the rear straightening elastic structure are integrally formed to form a complete elastic part, and the elastic part is divided into a front part, a rear part and a connecting part connecting the front part and the rear part, the front part constitutes the buffer elastic structure, the connecting part constitutes the groove bottom straightening elastic structure, and the rear part constitutes the rear straightening elastic structure; or, the buffer elastic structure, the groove bottom straightening elastic structure and the rear straightening elastic structure are respectively composed of different elastic parts.

7. The pressure plate bearing according to claim 4, characterized in that: The thicknesses of the buffer elastic structure, the groove bottom righting elastic structure and the rear righting elastic structure decrease in sequence.

8. The pressure plate bearing according to any one of claims 1 to 3, characterized in that: The pressure plate includes a straightening portion located behind the protrusion. Before the pressure plate is deformed, the straightening portion is in clearance fit with the outer peripheral surface of the bearing outer ring. After the pressure plate is deformed, the straightening portion is in pressure contact with the outer peripheral surface of the bearing outer ring.

9. The pressure plate bearing according to any one of claims 1 to 3, characterized in that: The minimum inner diameter of the protrusion is smaller than the maximum outer diameter of the thread opening.

10. The pressure plate bearing according to any one of claims 1 to 3, characterized in that: The protrusion is an annular protrusion.

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