Modulable actuator
By introducing a housing design with a stepped inner bore and an adjustment bolt structure into the brake, the problem of reduced braking torque after friction pad wear is solved, achieving automatic adjustment of braking torque and reduction of noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINING WEIDE HYDRAULIC MASCH CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-03
AI Technical Summary
Existing friction pad brakes suffer from reduced braking torque after the friction pads wear down, making accurate adjustment impossible, resulting in insufficient braking force and a cumbersome adjustment process.
The housing features a stepped inner bore design. By adjusting the bolts and disc spring retaining ring structure, the piston is controlled by hydraulic or high-pressure air to push the friction plate into contact. Combined with the disc spring adjustment plate, the preload of the disc spring can be finely adjusted to ensure stable braking torque.
It enables automatic adjustment of braking torque after friction pad wear, reduces noise, and improves the accuracy and convenience of brake use.
Smart Images
Figure CN224453468U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a brake, and more particularly to a brake with modulated dynamic torque. Background Technology
[0002] In a current type of friction pad brake, braking force is achieved through the friction between static and dynamic friction pads. The pressure applied between the friction pads is provided by a disc spring. When the brake friction pads wear down, the thickness of the friction pad assembly decreases, the height of the disc spring increases, and the preload of the disc spring decreases, thus reducing the braking torque and failing to meet the normal braking torque requirements. To ensure adequate braking force, the brake rear cover needs to be removed, and an adjusting shim needs to be added to the rear of the disc spring. The disadvantages are: firstly, the selected shim thickness may not be optimal; secondly, adjusting shims need to be added again after the friction pads wear down again, making brake torque adjustment cumbersome and inaccurate. Summary of the Invention
[0003] The purpose of this invention is to provide an adjustable brake to solve the defect of existing brakes that cannot adjust the braking torque.
[0004] The purpose of this utility model is achieved in the following manner: An adjustable actuator has a housing with a stepped inner hole, a rear cover fixed at the rear end of the housing, an output shaft supported by bearings in the holes of the housing and the rear cover with its front end extending outside the housing, several static friction plates fixed circumferentially to the housing are installed in the front part of the inner cavity of the housing, and dynamic friction plates fixed circumferentially to the output shaft are inserted between the static friction plates, the output shaft passes through the central holes of the static friction plates and the dynamic friction plates, the foremost static friction plate abuts against the front end face of the inner cavity of the housing, a piston is provided in the inner cavity of the housing behind the last static friction plate, a disc spring is supported behind the piston, a disc spring retaining ring is provided behind the disc spring, the piston, disc spring, and disc spring retaining ring are sleeved on the outside of the circumference of the output shaft through the inner hole, and several adjusting bolts are evenly distributed on the circumference of the rear cover and the center line of the output shaft, the front end of the adjusting bolt abuts against the back of the disc spring retaining ring, and a locking nut is screwed on the adjusting bolt.
[0005] The piston is a stepped annular structure with a small diameter at the front and a large diameter at the rear. Sealing rings are located on the outer circumference of the piston's small and large diameters, fitting into the stepped holes of the housing. A control port on the outer circumference of the housing communicates with the gap between the end faces of the stepped holes in the housing and the stepped end faces of the piston. Pressure media, such as hydraulic oil or high-pressure air, are applied to the piston through the control port. The piston moves backward, compressing the disc spring. A gap forms between the stationary and moving friction plates, and the friction between them is minimal, putting the brake in an unlocked braking state. The output shaft can rotate under power. When the pressure media is released, the piston moves forward under the force of the disc spring, pressing the stationary and moving friction plates together and subjecting them to axial pressure. Friction is generated between the stationary and moving friction plates, creating a rotational resisting torque on the output shaft, thus braking it.
[0006] A front cover is fixed to the front end of the housing by front cover screws. The inner side of the center hole of the front cover presses on the outer ring of the front bearing that supports the output shaft. A skeleton oil seal is provided at the center hole of the front cover. The skeleton oil seal seals the outer circumference of the output shaft. The skeleton oil seal prevents dust from entering the front bearing and lubricating oil from leaking out. The front cover serves to fix the front bearing and the skeleton oil seal.
[0007] A disc spring adjustment plate is provided between the disc spring and the disc spring retaining ring, which allows for fine adjustment of the overall height of the disc spring.
[0008] The number of adjusting bolts is 3-4.
[0009] When the brake friction pads wear down, the overall thickness of the friction pad assembly decreases, the disc spring lengthens, and the spring force decreases, resulting in a reduction in the brake torque. At this time, the adjusting bolt can be turned inward to compress the disc spring and restore its design preload, thereby achieving the goal of restoring the brake torque to its normal state. When the system pressure of the pressure medium is insufficient to fully push open the brake friction pads, the pressure on the disc spring can be reduced by turning the adjusting bolt outward, making it easier for the piston to push open the disc spring, unlock the brake friction pads, and reduce brake noise.
[0010] During adjustment, loosen the lock nuts one by one, turn the adjusting bolts inward to push the disc spring retaining ring forward, thereby increasing the pressure on the disc spring. After the adjustment meets the usage requirements, tighten the adjusting bolts with the lock nuts to prevent loosening. When adjusting the lock bolts, ensure that they are evenly stressed. If uneven adjustment is found, loosen the lock nuts and rotate the lock bolts to readjust.
[0011] The beneficial effects of this utility model are: when the brake friction pads are worn, the spring force of the disc spring can be adjusted to the normal range by adjusting the adjusting bolt, thereby ensuring that the braking torque is in the normal state; when the pressure of the matching control medium is insufficient to fully push the brake friction pads open, rotating the adjusting bolt reduces the pressure of the disc spring, allowing the friction pads to release the brake normally and reducing the noise of the brake. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of this utility model;
[0013] Figure 2 This is the outline drawing of this utility model.
[0014] In the diagram: 1-House; 2-Rear cover; 3-Front cover; 4-Rear bearing; 5-Front bearing; 6-Output shaft; 7-Sealing ring; 8-Piston; 9-Disc spring; 10-Dynamic friction plate; 11-Static friction plate; 12-Skeleton oil seal; 13-Disc spring adjusting plate; 14-Disc spring retaining ring; 15-Adjusting bolt; 16-Output shaft nut; 17-Cocker pin; 18-Rear cover screw; 19-Front cover screw; 20-Locking nut; 21-Control port. Detailed Implementation
[0015] Reference Figure 1 , Figure 2The device comprises a housing 1 with a stepped inner hole, and a rear cover 2 fixed to the rear end of the housing 1 by a rear cover screw 18; and an output shaft 6, which is supported in the holes of the housing 1 and the rear cover 2 by a front bearing 5 and a rear bearing 4. The hole in the housing 1 is a through hole, and the hole in the rear cover 2 is a blind hole. The front end of the output shaft 6 extends outside the housing 1. The portion of the output shaft 6 outside the housing 1 is a tapered shank with a keyway. The tapered shank is used to mount a brake disc or a wheel-like object connected to a braking shaft. An output screw is screwed onto the threaded portion at the front end of the output shaft 6. The shaft nut 16 is used to axially fix the brake disc, etc. The output shaft nut 16 is a grooved anti-reverse nut. A cotter pin 17 is installed in the radial hole at the front end of the output shaft 6. The cotter pin 17 is locked in the groove of the output shaft nut 16 to prevent it from rotating and unscrewing. The front cover 3 is fixed to the front end of the housing 1 by the front cover screw 19. The inner side of the center hole of the front cover 3 presses against the outer ring of the front bearing 5. A skeleton oil seal 12 is provided at the center hole of the front cover 3. The skeleton oil seal 12 seals the outer circumference of the output shaft 6. Several circumferentially fixed parts are installed at the front of the inner cavity of the housing 1. A static friction plate 11 is provided, and a dynamic friction plate 10, circumferentially fixed to the output shaft 6, is inserted between the static friction plates 11. The output shaft 6 passes through the central hole of the static friction plates 11 and the dynamic friction plates 10. The foremost static friction plate 11 abuts against the front end face of the inner cavity of the housing 1. A piston 8 is provided behind the last static friction plate 11 in the inner cavity of the housing 1. The piston 8 is a stepped annular shape with a small diameter at the front and a large diameter at the rear. A sealing ring 7 is provided on the outer circumference of the small and large diameters of the piston. The sealing ring 7 is adapted to the stepped hole of the housing 1. A control port 21 is provided on the circumference, which communicates with the gap between the stepped end face of the housing and the stepped end face of the piston. A disc spring 9 is supported behind the piston 8. A disc spring adjustment plate 13 and a disc spring retaining ring 14 are provided behind the disc spring 9. The piston 8, disc spring 9, disc spring adjustment plate 13, and disc spring retaining ring 14 are fitted around the outside of the circumference of the output shaft 6 through the inner hole. Four adjusting bolts 15 are evenly distributed on the circumference of the rear cover 2 and the center line of the output shaft 6. The front end of the adjusting bolt 15 rests on the back of the disc spring retaining ring 14. A locking nut 20 is screwed on the adjusting bolt 15.
[0016] The brake is connected to an external hydraulic oil or high-pressure air drive source through the control port 21. When pressurized, the brake is in the unlocked state, and when depressurized, the output shaft 6 is in the braking state. When the brake friction pads are worn, the adjusting bolt 15 is rotated inward to compress the disc spring 9, so as to restore the preset elasticity of the disc spring 9 and ensure braking performance.
Claims
1. A modulatable brake having a housing with a stepped bore, a rear cover fixed to the rear end of the housing, an output shaft supported by bearings in the bore of the housing and the rear cover and having a forward end projecting outside the housing, characterized in that: Several static friction plates (11) fixed circumferentially to the housing (1) are installed at the front of the inner cavity of the housing (1). Dynamic friction plates (10) fixed circumferentially to the output shaft (6) are inserted between the static friction plates (11). The output shaft (6) passes through the central hole of the static friction plates (11) and the dynamic friction plates (10). The foremost static friction plate (11) abuts against the front end face of the inner cavity of the housing (1). A piston (8) is provided in the inner cavity of the housing (1) behind the last static friction plate (11). The piston (8) is supported by a disc spring (9), and a disc spring retainer (14) is provided behind the disc spring (9). The piston (8), disc spring (9), and disc spring retainer (14) are fitted around the outside of the output shaft (6) through the inner hole. Several adjusting bolts (15) are evenly distributed on the circumference of the rear cover (2) and the center line of the output shaft (6). The front end of the adjusting bolt (15) is pressed against the back of the disc spring retainer (14), and a locking nut (20) is screwed on the adjusting bolt (15).
2. The adjustable brake of claim 1, wherein: The piston (8) is a stepped ring with a small diameter at the front and a large diameter at the rear. A sealing ring (7) is provided on the outer circumference of the small and large diameters of the piston (8). The sealing ring (7) is adapted to the stepped hole of the housing (1). A control port (21) is provided on the outer circumference of the housing (1) and communicates with the gap between the end face of the stepped hole of the housing (1) and the stepped end face of the piston (8).
3. The adjustable brake of claim 1, wherein: A front cover (3) is fixed to the front end of the housing (1) by a front cover screw (19). The inner side of the center hole of the front cover (3) presses on the outer ring of the front bearing (5) supporting the output shaft (6). A skeleton oil seal (12) is provided at the center hole of the front cover (3). The skeleton oil seal (12) seals the outer circumference of the output shaft (6).
4. The adjustable brake of claim 1, wherein: A disc spring adjusting plate (13) is provided between the disc spring (9) and the disc spring retaining ring (14).
5. The adjustable brake of claim 1, wherein: The number of adjusting bolts (15) is 3-4.