Disc brakes

Abstract

A disc brake is provided, comprising: a brake disc (13) disposed between a fixed disc (4) and an armature (5) of an electromagnet; a fastening bolt (14) for securing the electromagnet passes through a yoke (6) of the electromagnet, the armature, and the fixed disc in that order; a positioning sleeve (7) fitted onto the fastening bolt, one end of the positioning sleeve abutting the yoke and the other end abutting the fixed disc; the armature slidably fitted into the positioning sleeve; a ring-shaped upper convex edge formed on the disc surface of the fixed disc along the axial hole; a core hole of a floating disc (2) fitted onto the upper convex edge; an engagement opening for engagement with the positioning sleeve opened in the floating disc, the engagement opening and the positioning sleeve fitted together with a clearance maintained therebetween; one end of a tensile pressure sensor (3) axially attached to the fixed disc and the other end to the floating disc; the range of the clearance between the engagement opening and the positioning sleeve being within the maximum allowable deformation limit of the tensile pressure sensor. This design simplifies the structure of the disc brake, effectively reducing manufacturing costs and improving the market competitiveness of the product.

Description

TECHNICAL FIELD

[0001] The present invention relates to an electromagnetic brake, and specifically relates to a disc brake capable of detecting braking torque in real time. BACKGROUND ART

[0002] Motor brakes used in mechanical equipment such as wind power generators may experience a gradual decrease or failure of the braking moment of the brake due to wear during use. Wind power generators are generally installed in remote mountainous areas, deserts, mountainous regions or at sea, and their core power generation equipment is generally installed at the top of the generator tower, making the maintenance and inspection of the equipment extremely difficult and costly. For wind power generators, how to carry out maintenance and inspection effectively has become a major issue.

[0003] CN113374816A discloses a braking friction force detection device for a disc brake, which includes a disc clutch type circumferential fine movement mechanism and a tension-pressure sensor. The disc clutch type circumferential fine movement mechanism includes a fixed disc provided on the motor, a torque transmission disc adjacent to the braking disc of the motor, and a ball bearing disposed between the fixed disc and the torque transmission disc. The fixed disc and the torque transmission disc realize circumferential fine movement of the torque transmission disc during braking through clearance fit of protrusions and grooves provided on the respective disc surfaces. The tension-pressure sensor includes an elastic body and a resistance strain gauge affixed to the elastic body. One end of the elastic body is connected to the fixed disc via a pin shaft, and the other end is connected to the torque transmission disc via a pin shaft. This braking friction force detection device realizes circumferential fine movement of the torque transmission disc through the fitting of protrusions and grooves provided on the mutually attached disc surfaces of the fixed disc and the torque transmission disc, so as to realize transmission of braking torque and prevent damage to the tension-pressure sensor caused by excessive rotation. Its structure is relatively complex, the processing of the protrusions and grooves arranged on the disc surface takes a long time and consumes a large amount of materials, which increases the manufacturing cost of the detection device and reduces its market competitiveness. [Overview of the project] [Problems that the invention aims to solve]

[0004] The objective of the present invention is to provide a disc brake capable of detecting braking torque in real time, in order to solve the problem of the complex structure and high manufacturing cost of the braking friction force detection device used in conventional disc brakes. [Means for solving the problem]

[0005] The objective of the present invention is achieved as follows. A disc brake is provided between a fixed disc and the armature of an electromagnet, and a tightening bolt for fixing the electromagnet passes through the yoke of the electromagnet, the armature, and the fixed disc in that order, wherein a positioning sleeve is fitted to the tightening bolt, one end of the positioning sleeve abuts against the yoke and the other end abuts against the fixed disc, the armature is slidably fitted with the positioning sleeve, the disc surface of the fixed disc is provided with a ring-shaped upper convex edge along the axial hole, the core hole of the floating disc is fitted to the upper convex edge, the floating disc has an engagement opening that engages with the positioning sleeve, the engagement opening and the positioning sleeve are fitted with a clearance between them, one end of a tensile pressure sensor is axially attached to the fixed disc and the other end is axially attached to the floating disc, and the range of the clearance between the engagement opening and the positioning sleeve is within the maximum allowable deformation limit of the tensile pressure sensor.

[0006] Furthermore, a thrust needle roller bearing is provided between the floating disc and the fixed disc.

[0007] Furthermore, the floating disk is pressed against the disk surface of the fixed disk by a compression spring or spring retainer plate.

[0008] Furthermore, the engagement opening is a notch made in the edge of the floating disk or a circular hole made in the disk surface of the floating disk.

[0009] Furthermore, axial splines are provided on the inner wall of the axial hole of the braking disc, and a spline sleeve for connection to the motor output shaft is slidably fitted with the splines in the axial hole of the braking disc. [Effects of the Invention]

[0010] In this invention, by attaching a positioning sleeve to the fastening bolt, the electromagnet and the fixed disc can be positioned with a gap between them on the motor casing, and the amount of axial rotation of the floating disc can be controlled within the deformation limit of the elastic body of the tensile pressure sensor, acting as a rotation restricting member for the floating disc. This not only ensures that the tensile pressure sensor provides accurate and reliable detection data within its normal deformation limit, but also prevents the floating disc from rotating without restriction if the tensile pressure sensor breaks and loses its function, thereby avoiding brake fade and ensuring the safe use of the disc brake.

[0011] Both the fixed disc and floating disc used in this invention have a conventional structure, and since the disc surface does not have protrusions or grooves that need to be fitted together, long processing times and excessive material consumption are avoided. As a result, the structure of the disc brake is simplified, manufacturing costs are effectively reduced, and the market competitiveness of the product is improved. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram of the structure of the disc brake of the present invention. [Figure 2] This is a cross-sectional view in direction AA of Figure 1. [Figure 3] This is a cross-sectional view in the BB direction of Figure 1. [Figure 4] Figure 3 is a partial cross-sectional view in the CC direction. [Figure 5]This is a schematic diagram illustrating the structure in which a floating disc is pressed down by a spring retaining plate. [Modes for carrying out the invention]

[0013] As shown in Figures 1, 2, and 3, the yoke 6, armature 5, and coils 10 and brake springs 11 provided in the existing grooves of the yoke, respectively, together constitute a brake release electromagnet for the disc brake. A tightening bolt 14 passes through the yoke 6, armature 5, positioning sleeve 7, and fixed disc 4 in sequence, fixing the electromagnet and fixed disc 4 to the motor casing (not shown). One end of the positioning sleeve 7 abuts against the yoke 6 and the other end abuts against the fixed disc 4, thereby limiting the distance between the yoke 6 and the fixed disc 4 and ensuring sufficient clearance for movement of the brake disc 13. The armature 5 has a through hole for slidably fitting onto the outer circumference of the positioning sleeve 7. The brake disc 13 is provided between the fixed disc 4 and the armature 5, and axial splines are provided on the inner wall of the axial hole of the brake disc 13. A spline sleeve 12 connected to the motor output shaft slidably fits with the splines in the axial hole of the brake disc. An adjustment pad 8 is provided at one end of the positioning sleeve 7 to adjust the movement gap of the braking disc 13. Friction plates are provided on both sides of the braking disc 13, and friction braking is performed by these friction plates.

[0014] The disc surface of the fixed disc 13 facing the braking disc is provided with a ring-shaped upper convex edge along the axial hole, and the core hole of the floating disc 2 is fitted onto the upper convex edge of the fixed disc 4. By providing a thrust needle roller bearing 9 between the floating disc 2 and the fixed disc 13, the rotational resistance and rotational friction force of the floating disc 2 are reduced to the greatest extent possible, thereby improving the detection accuracy of braking friction force and braking torque. The floating disc 2 can be pressed against the disc surface of the fixed disc 4 by a compression spring or a spring retainer plate. Specifically, elastic pressing against the floating disc can be achieved by one of the following methods.

[0015] Fixed disk 4 The disc surface facing the braking disc has a ring-shaped upper convex edge along the axial hole, and the core hole of the floating disc 2 is fitted onto the upper convex edge of the fixed disc 4. 4 The presence of a thrust needle roller bearing 9 between the floating disc 2 and the fixed disc 4 minimizes rotational resistance and friction, thereby improving the detection accuracy of braking friction and braking torque. The floating disc 2 can be pressed against the disc surface of the fixed disc 4 by a compression spring or spring retainer plate. Specifically, elastic pressing against the floating disc can be achieved by one of the following methods.

[0016] In the second method, as shown in Figure 4, a non-threaded hole is provided in the floating disc 2. The bolt 15 passes through the threaded hole in the fixed disc 4 and the non-threaded hole in the floating disc 2 from the side of the fixed disc 4, and then is exposed from the side of the floating disc. The exposed end of the bolt is pressed against the disc surface of the floating disc 2 by the cooperation of a nut 17 and a washer.

[0017] In the third method, as shown in Figure 5, a non-threaded hole is provided in the floating disc 2. The bolt 15 passes through the threaded hole in the fixed disc 4 and the non-threaded hole in the floating disc 2 from the side of the fixed disc 4, and then is exposed from the side of the floating disc. A nut 17 and a washer work together to press a spring retaining plate 16 against the disc surface of the floating disc 2 at the exposed end.

[0018] In Figure 1, the floating disk 2 has an engagement port that engages with the positioning sleeve 7, and the engagement port and the positioning sleeve 7 are fitted together with a clearance between them. The engagement port of the floating disk 2 may be a notch opened in the edge of the floating disk, or it may be a circular hole opened in the disk surface of the floating disk. The range of the clearance between the engagement port and the positioning sleeve 7 should be within the maximum allowable deformation range of the tensile pressure sensor. In addition, the fitting gap between the threadless hole of the floating disk 2 and the screw / bolt should also be greater than the range of the clearance between the engagement port and the positioning sleeve.

[0019] The tensile pressure sensor 3 can employ a conventional sensor structure and includes an elastic body that senses strain and a strain gauge attached to the elastic body that detects and transmits strain detection signals. As shown in Figure 1, one end of the tensile pressure sensor 3 is connected to a fixed disk 4 via a pin shaft, and the other end of the tensile pressure sensor 3 is connected to a floating disk 2 via a pin shaft. When the power to the electromagnet coil 10 is lost, the armature 5 is pressed against the braking disc 13, which rotates with the motor output shaft, by the action of the braking spring 11. At this time, the braking disc 13 is pressed against the armature 5 and the floating disc by friction plates on both sides of its disc surface. 2 Braking friction is generated between each of the components, and this friction causes the floating disc 2 to rotate slightly in the wheel direction. This rotational force in the wheel direction pulls on the tensile pressure sensor 3, causing a minute strain. The strain gauge of the tensile pressure sensor 3 converts this minute strain into an electrical signal that reflects the magnitude of the braking friction and outputs it externally. This enables real-time detection of the braking friction force of the disc brake. After detecting the braking friction force data, the structural dimensions of the brake disc can be added to calculate the magnitude of the braking moment generated during the braking based on the moment calculation formula, thereby enabling real-time detection of the braking moment of the disc brake. [Explanation of Symbols]

[0020] 1 Compression spring 2 Floating disc 3 Tension and pressure sensor 4 Fixed disc 5 Armature 6 Yoke 7 Positioning sleeve 8 Adjustment pad 9 Thrust needle roller bearing 10 Coil 11 Brake spring 12 Spline sleeve 13 Brake disc 14 Tightening bolt 15 Bolt 16 Spring retainer plate 17 Nut

Claims

1. A disc brake is provided between a fixed disc and the armature of an electromagnet, and a tightening bolt for fixing the electromagnet passes through the yoke of the electromagnet, the armature, and the fixed disc in that order. A positioning sleeve is fitted onto the fastening bolt, one end of the positioning sleeve abuts against the yoke and the other end abuts against the fixing disc, and the armature is slidably fitted with the positioning sleeve. The disk surface of the fixed disk is provided with a ring-shaped upper convex edge along the shaft hole, and the core hole of the floating disk is fitted onto the upper convex edge. The floating disk has an engagement port that engages with the positioning sleeve, and the engagement port and the positioning sleeve are engaged with a clearance between them. One end of the tensile pressure sensor is axially attached to a fixed disk, and the other end is axially attached to a floating disk. The clearance between the engagement port and the positioning sleeve is within the maximum allowable deformation limit of the tensile pressure sensor. The braking disc generates a braking friction force between the armature and the floating disc, respectively, and generates a rotational force on the floating disc. A disc brake characterized by the following features.

2. A thrust needle roller bearing is provided between the floating disk and the fixed disk. The disc brake according to feature 1.

3. The floating disk is pressed against the disk surface of the fixed disk by a compression spring or spring retainer plate. The disc brake according to feature 1.

4. The engagement opening is a notch made in the edge of the floating disk or a circular hole made in the disk surface of the floating disk. The disc brake according to feature 1.

5. The inner wall of the axial hole of the braking disc has axial splines, and the spline sleeve for connection to the motor output shaft is slidably fitted with the splines in the axial hole of the braking disc. The disc brake according to feature 1.

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