Adjusting device and disc brake

Abstract

The application discloses a kind of adjusting device and disc brake, the flange bushing of the adjusting device is set to include extension section and at least one first protruding structure, first protruding structure is set on extension section;Ball ramp clutch includes shift fork and ramp valve plate, shift fork has first through hole and at least one second protruding structure, second protruding structure is set in the inner wall of first through hole, ramp valve plate has second through hole;Extension section is inserted into the second through hole of ramp valve plate by the first through hole of shift fork;First protruding structure on extension section cooperates with the second protruding structure in first through hole, and the first working rotation angle of shift fork is limited;Second through hole of ramp valve plate does not set the component that rotation of extension section is blocked by.The flange bushing only directly accepts torque from shift fork, and ramp valve plate no longer directly contacts flange bushing to transmit torque, so as to reduce the torque that ramp valve plate acts on flange bushing.

Description

Technical Field

[0001] This invention relates to the field of disc brakes, and particularly to an adjustment device and a disc brake. Background Technology

[0002] Disc brakes are a common automotive braking system that converts the kinetic energy of a moving vehicle into heat through friction, dissipating it into the surrounding air. In this system, brake pads are tightly pressed against a rotating brake disc. When the driver depresses the brake pedal, the brake air chamber pushes a clamping mechanism inside the brake caliper, creating friction between the brake pads and the brake disc, thereby reducing the vehicle's speed or bringing it to a stop. However, as wear occurs between the brake pads and the brake disc during braking, the gap between them increases. Therefore, manufacturers typically add adjustment mechanisms to disc brakes to automatically adjust this gap and to manually reset the clamping mechanism when replacing the brake pads.

[0003] However, during the manual reset of the disc brake's clamping mechanism (hereinafter referred to as the reset process), the ball ramp clutch of the existing adjustment device will be subjected to a large torque and generate a large axial impact force, a large torsional torque, and torsional deformation on the flange bushing. This will further generate corresponding impact and torque on the bearing washers that connect the adjustment device and the disc brake. In severe cases, it will deform the adjustment device and damage the clamping mechanism of the disc brake, making the disc brake unable to be used normally.

[0004] Therefore, there is an urgent need for an adjustment device and a disc brake that can reduce the axial impact or torsional force of the ball bearing ramp clutch on the flange bushing during the adjustment process. Summary of the Invention

[0005] The present invention aims to provide an adjustment device and a disc brake that can solve the above-mentioned technical problems.

[0006] According to one aspect of the present invention, an adjusting device for adjusting the wear of brake friction pads and brake disc of a disc brake is provided, comprising a drive shaft head, a bearing seat ring, a flange bushing, a ball ramp clutch, a cylindrical spring, and a spring sleeve. The flange bushing includes an extension section and at least one first protrusion structure disposed on the extension section. The ball ramp clutch includes a shift fork and a ramp valve plate. The shift fork has a first through hole and at least one second protrusion structure disposed on the inner wall of the first through hole. The ramp valve plate has a second through hole. The extension section of the flange bushing is inserted into the second through hole of the ramp valve plate through the first through hole of the shift fork. The first protrusion structure on the extension section cooperates with the second protrusion structure in the first through hole to define a first working rotation angle of the shift fork. No component that obstructs the rotation of the extension section is provided in the second through hole of the ramp valve plate.

[0007] Preferably, the length of the first protruding structure is shorter than the length of the extension section, and when the extension section is inserted into the ball ramp clutch, the first protruding structure does not enter the second through hole of the ramp valve plate.

[0008] Preferably, the ball ramp clutch further includes a first ball, the ramp valve plate has at least one first ball groove, the first ball is mounted in the first ball groove, the shift fork and the ramp valve plate are separated by the first ball; the rolling of the first ball in the first ball groove defines a second working rotation angle of the ramp valve plate.

[0009] Preferably, the fork has at least one second ball groove on the side facing the ramp valve plate, the second ball groove corresponding to the first ball groove in position, such that the first ball groove and the second ball groove form a space for the first ball to roll, defining the second working rotation angle of the ramp valve plate.

[0010] Preferably, the first ball groove includes a first end and a second end, and the second ball groove includes a third end and a fourth end; the first end and the second end of the first ball groove have different groove depths, and the depth gradually decreases from the first end to the second end; the third end and the fourth end of the second ball groove have different groove depths, and the depth gradually decreases from the third end to the fourth end; wherein, the second ball groove and the first ball groove are arranged in opposite directions.

[0011] Preferably, the ramp valve plate has a first rolling surface arranged below for the second ball; the adjusting device further includes a conical clutch having a conical bushing with a second rolling surface arranged on the upper side for the second ball; the ramp valve plate and the conical bushing are separated by the second ball.

[0012] Preferably, the tapered bushing is disposed inside the spring sleeve.

[0013] Preferably, the tapered bushing has a third rolling surface arranged on its lower end face for the third ball; the adjusting device further includes a ball groove clutch having a ball bushing having a fourth rolling surface arranged on its upper end face for the third ball; the ball bushing and the tapered bushing are separated by the third ball.

[0014] Preferably, the ball bushing is disposed inside the spring sleeve and forms an anti-torsional connection with the inner wall of the spring sleeve.

[0015] According to another aspect of the invention, a disc brake is provided, which includes the adjustment device described above.

[0016] In this application, the flange bushing has an extension section and at least one first protruding structure, and the length of the first protruding structure is specifically set so that during the automatic adjustment process of the adjustment device, the flange bushing only directly receives the torque from the shift fork, and the ramp valve plate no longer directly contacts the flange bushing to transmit torque, thereby reducing the torque exerted by the ramp valve plate on the flange bushing and improving the stability of the adjustment device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a disc brake.

[0018] Figure 2 This is an overall structural diagram of the regulating device involved in this application;

[0019] Figure 3 This is a schematic diagram of the flange bushing structure involved in this application;

[0020] Figure 4 This is a schematic diagram of the ball-bearing ramp clutch structure involved in this application;

[0021] Figure 5A This is a schematic diagram of the rolling surface structure of the shift fork involved in this application;

[0022] Figure 5B This is a schematic diagram of the ball groove structure of the ramp valve plate involved in this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this application’s specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be intermediate elements. Furthermore, the term “connected” as used herein can include wireless connections. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0025] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0026] The adjusting device involved in this application can be adapted to disc brakes, etc. The structure and function of disc brakes can be referenced from, for example, the content disclosed in specification DE19729024C1, and can be incorporated into this application. Meanwhile, the general structure and function of the adjusting device involved in this application can be referenced from the content disclosed in specification DE102004037771A1, and can be incorporated into this application. The following parts of this application mainly explain the improvements to the structure and function of the adjusting device by the present invention through illustrative embodiments described with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of a disc brake. The structure and function of a disc brake can be found in the corresponding instruction manual (DE19729024C1). Figure 1As shown, the disc brake 20 includes: an adjusting device 1, a brake disc 21, a brake caliper 22, brake friction pads 23, a crossbeam 24, an adjusting shaft 25 (26), a pressure bearing 27, a sprocket 28, a chain 29, an eccentric wheel 30, and a torsion bar 31. The torsion bar 31 has a driving member 32. The driving member 32 and the shift fork 6 of the adjusting device 1 (see reference) Figure 2 They work together. The aforementioned adjusting device 1 is arranged in the adjusting shaft 25.

[0028] Figure 2 This is a schematic diagram of the overall structure of the adjusting device involved in this application. The adjusting device 1 involved in this application is mainly used to compensate for the clearance generated by the disc brake due to braking friction. Figure 2 As shown, the aforementioned adjusting device 1 includes: a drive shaft head 2, a bearing housing 3, a flange bushing 4, a ball ramp clutch 7, a conical clutch 9, a ball groove clutch 16, a cylindrical spring 10, a spring sleeve 11, and a two-tooth locking washer 15, etc. The upper end of the drive shaft head 2 is located on the arcuate concave surface 301 of the bearing washer 3 (see reference). Figure 3 In the above-mentioned drive shaft head 2, the main shaft 21 extends through the entire adjusting device 1; the bearing race 3 is used to fix the adjusting device 1 in the brake caliper 22; the flange bushing 4 is anti-torsional connected to the bearing race 3; the ball ramp clutch 7 has a ramp valve plate 8, which has a rolling surface for the ball 14 arranged on the lower end face; the conical clutch 9 has a conical bushing 12, which has a rolling surface for the ball 14 arranged on the upper side face; the ramp valve plate 8 and the conical bushing 12 are separated by the ball 14. The tapered bushing 12 has a rolling surface on its lower end face suitable for the ball 41; the ball groove clutch 16 has a ball bushing 13 with a rolling surface on its upper end face suitable for engaging with the ball 41, and the ball bushing 13 is torsionally connected to the spring sleeve 11; a cylindrical spring 10 is arranged in the spring sleeve 11 and supported on a two-tooth locking washer 15; an adjusting element (e.g., a nut or rivet joint) is arranged on the lower end of the main shaft 21 and is used to tension the cylindrical spring 10 and to axially concentrate the components of the adjusting device 1 together.

[0029] In the above embodiment, the ball bushing 13 is disposed inside the spring sleeve 11, so that the ball bushing 13 and the inner wall of the spring sleeve 11 fit more tightly. The anti-torsional connection formed between the ball bushing 13 and the inner wall of the spring sleeve 11 increases the torque between the ball bushing 13 and the spring sleeve 11, and makes the torque consumption between the ball bushing 13 and the spring sleeve 11 last longer.

[0030] In the above embodiment, the tapered bushing 12 is disposed inside the spring sleeve 11, so that the spring sleeve 11 provides protection for the tapered bushing 12 from damage caused by external impact.

[0031] Figure 3 This is a schematic diagram of the flange bushing structure involved in this application. Figure 3 As shown, the bearing race 3 also has an arcuate surface 49 and a connecting piece 303. The flange bushing 4 has an arcuate concave surface 48 on its upper side and a rolling surface suitable for the balls 5 on its lower side. The extension section 42 of the flange bushing 4 passes through the shift fork 6 and enters the ramp valve plate 8. The flange bushing 4 has a protruding structure 43, which is disposed on the extension section 42. The length of the protruding structure 43 is shorter than that of the extension section 42. When the extension section 42 is inserted into the ball ramp clutch 7, the protruding structure 43 does not enter the through hole 46 of the ramp valve plate 8. The protruding structure 43 can be a strip structure, and one or more strip structures can be provided on the extension section 42. The side of the flange bushing 4 also has a bayonet 402 for engaging with the connecting piece 303.

[0032] In the above embodiment, the arc surface 49 and the arc concave surface 48 mate, with the arc concave surface 48 abutting against the arc surface 49 of the bearing washer 3. The connecting piece 303 and the bayonet 402 mate, with the connecting piece 303 snapping into the bayonet 402, thereby preventing the bearing seat 3 and the flange bushing 4 from being twisted.

[0033] Figure 4 This is a schematic diagram of the ball-bearing ramp clutch structure involved in this application. Figure 4 As shown, the aforementioned ball-bearing ramp clutch 7 includes a shift fork 6, balls 40, and a ramp valve plate 8. The shift fork 6 includes balls 5, a shift fork 61, ball grooves 62, a ring 63, a protruding structure 44, and a through hole 45. The shift fork 61 and the drive member 32 of the torsion bar 31 (see reference...) Figure 1The flange bushing 4 has a through hole 46 and at least one ball groove 64. A ball 5 is installed in the ball groove 62, and the rolling surface of the flange bushing 4 is located on one side of the fork 6, separated from it by the ball 5. A protruding structure 44 is provided on the inner wall of the through hole 45 and cooperates with the protruding structure 43 of the flange bushing 4. The number of protruding structures 44 corresponds to the number of protruding structures 43. The ramp valve plate 8 has a through hole 46 and at least one ball groove 64. A ball 40 is installed in the ball groove 64, and the fork 6 has a rolling surface suitable for the ball 40 on the side facing the ramp valve plate 8. The ramp valve plate 8 and the fork 6 are separated by the ball 40. No component that obstructs the rotation of the extended section is provided in the through hole 46 of the ramp valve plate 8.

[0034] In the above embodiment, the extension section 42 of the flange bushing 4 is inserted into the through hole 46 of the ramp valve plate 8 through the through hole 45 of the fork 6. Specifically, the protruding structure 43 on the extension section 42 of the flange bushing 4 only extends into the through hole 45 of the fork 6, and does not extend into the through hole 46 of the ramp valve plate 8 (see reference). Figure 2 Therefore, the protruding structure 43 on the extension section 42 of the flange bushing 4 only cooperates with the protruding structure 44 of the shift fork 6, defining a working rotation angle α (refer to...). Figure 5A ).

[0035] In the prior art, the protruding structure 43 on the extension section 42 of the flange bushing 4 passes through the entire ball ramp clutch 7 and works with the clutch ring of the conical clutch 9 to define a working rotation angle α. This arrangement causes the adjusting device 1 to generate a large impact and additional large torsional torque and torsional deformation on the flange bushing 4 during adjustment and reset, which in turn adversely affects the mounting point of the bearing washer 3 on the brake caliper 22. In the above embodiment, the protruding structure 43 on the extension section 42 of the flange bushing 4 is shortened, so that the ramp valve plate 8 does not need to directly contact the flange bushing 4, but instead relies on the ball 40 between the shift fork 6 and the ramp valve plate 8 for contact and action. This shortens the effective torque from the torque application point of the ramp valve plate 8 to the edge of the flange bushing 4, which can effectively reduce the torsional deformation and torsional torque of the flange bushing 4 and protect the mounting point of the bearing washer 3.

[0036] In the above embodiments, one or more of the protruding structures 43 on the extension section 42 of the flange bushing 4 can be provided, and one or more of the protruding structures 44 of the shift fork 6 can also be provided corresponding to the number of the protruding structures 43.

[0037] Figure 5A This is a schematic diagram of the rolling surface structure of the shift fork involved in this application. Figure 5B This is a schematic diagram of the ball groove structure of the ramp valve plate involved in this application. Figure 5A As shown, the rolling surface of the aforementioned shift fork 6 has at least one ball groove 65, the groove depths of one end 651 and the other end 652 of the ball groove 65 being different, with the depth gradually decreasing from one end 651 to the other end 652. Figure 5B As shown, the ball grooves 64 of the ramp valve plate 8 have different depths at one end 641 and the other end 642, with the depth gradually decreasing from one end 641 to the other end 642. The positions of the ball grooves 64 and 65 correspond to the positions of the ball grooves 65, but their orientations are opposite; that is, the orientation of one end 651 corresponds to the orientation of the other end 642, and the orientation of the other end 652 corresponds to the orientation of one end 641. For example, when the adjustment device 1 is being adjusted, when the shift fork 6 moves in one direction (e.g.) Figure 5B When rotating in the X direction (as shown), if the starting position of the ball 40 is within the space formed by one end 651 and one end 641, the ball 40 rolls from one end 641 to one end 642 in the ball groove 64 of the ramp valve plate 8, and simultaneously rolls from one end 651 to the other end 652 in the ball groove 65 of the shift fork 6. When the ball 40 rolls from the other end 641 to one end 642 in the ball groove 64 of the ramp valve plate 8, the rotation of the shift fork 6 in that direction stops. When rotating in the opposite direction (e.g., ... Figure 5B When rotating in the opposite direction of the X direction (as shown), the ball 40 rolls from the other end 642 to the first end 641 in the ball groove 64 of the ramp valve plate 8, and simultaneously rolls from the first end 652 to the other end 651 in the ball groove 65 of the shift fork 6. When the ball 40 rolls from the other end 642 to the first end 641 in the ball groove 64 of the ramp valve plate 8, the rotation of the shift fork 6 in the opposite direction stops. Therefore, the ball groove 65 of the shift fork 6 and the ball groove 64 of the ramp valve plate 8 cooperate to make the ball 40 roll within a certain range, thereby defining a working rotation angle θ.

[0038] In the above implementation scheme, the following is adopted: Figure 5A and Figure 5BThe structure of the ball groove 65 of the shift fork 6 and the ball groove 64 of the ramp valve plate 8 shown herein can gradually reduce the torsional moment between the shift fork 6 and the ramp valve plate 8, thereby further reducing the axial impact force on the flange bushing 4. This effectively reduces the torsional deformation and torsional moment of the flange bushing 4, protecting the mounting point of the bearing washer 3. In particular, for example, in the event of brake overload during emergency braking, a large axial impact force is generated on the flange bushing 4. Using the structure described in this embodiment, the movement of the balls effectively buffers the axial impact force, providing overload protection.

[0039] In the above implementation scheme, the working rotation angle θ may be the same as or different from the working rotation angle α.

[0040] According to another aspect of the present invention, a disc brake is provided, including the adjustment device of any of the above embodiments, and the advantages of the disc brake can be found in the embodiments of the adjustment device described above.

[0041] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations.

[0042] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0043] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An adjusting device for adjusting the wear of brake friction linings and brake disc in a disc brake, comprising a drive shaft head, a bearing housing, a flange bushing, a ball-loaded ramp clutch, a cylindrical spring, and a spring sleeve, characterized in that: The flange bushing includes an extension section and at least one first protrusion structure disposed on the extension section; The ball-bearing ramp clutch includes a shift fork and a ramp valve plate. The shift fork has a first through hole and at least one second protruding structure. The second protruding structure is disposed on the inner wall of the first through hole. The ramp valve plate has a second through hole. The extension of the flange bushing is inserted into the second through hole of the ramp valve plate through the first through hole of the fork. Wherein, the first protruding structure on the extension section cooperates with the second protruding structure in the first through hole to limit the first working rotation angle of the shift fork; The second through hole of the ramp valve plate does not contain any component that blocks the rotation of the extension section.

2. The adjusting device according to claim 1, characterized in that: The length of the first protruding structure is shorter than the length of the extension section, and when the extension section is inserted into the ball ramp clutch, the first protruding structure does not enter the second through hole of the ramp valve plate.

3. The adjusting device according to claim 1, characterized in that: The ball ramp clutch further includes a first ball, the ramp valve plate has at least one first ball groove, the first ball is installed in the first ball groove, and the shift fork and the ramp valve plate are separated by the first ball. The rolling of the first ball in the first ball groove defines the second working rotation angle of the ramp valve plate.

4. The adjusting device according to claim 3, characterized in that: The fork has at least one second ball groove on the side facing the ramp valve plate. The second ball groove corresponds in position to the first ball groove, such that the first ball groove and the second ball groove form a space for the first ball to roll, defining the second working rotation angle of the ramp valve plate.

5. The adjusting device according to claim 4, characterized in that: The first ball groove includes a first end and a second end, and the second ball groove includes a third end and a fourth end; The first end and the second end of the first ball groove have different groove depths, and the depth gradually decreases from the first end to the second end. The groove depths at the third and fourth ends of the second ball groove are different, with the depth gradually decreasing from the third end to the fourth end. The second ball groove is arranged in the opposite direction to the first ball groove.

6. The adjusting device according to any one of claims 1-5, characterized in that: The ramp valve plate has a first rolling surface arranged below for the second ball; The adjusting device further includes a conical clutch having a conical bushing with a second rolling surface arranged on the upper side for the second ball. The ramp valve plate and the conical bushing are separated by the second ball bearing.

7. The adjusting device according to claim 6, characterized in that: The tapered bushing is disposed inside the spring sleeve.

8. The adjusting device according to claim 6, characterized in that: The tapered bushing has a third rolling surface arranged on the lower end face, suitable for the third ball; The adjusting device further includes a ball groove clutch having a ball bushing with a fourth rolling surface arranged on the upper end face for the third ball. The ball bushing and the tapered bushing are separated by the third ball.

9. The adjusting device according to claim 8, characterized in that: The ball bushing is disposed inside the spring sleeve and forms an anti-torsional connection with the inner wall of the spring sleeve.

10. A disc brake, characterized in that: Includes the adjusting device as described in any one of claims 1-9.

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