An assembly detection device for a parking brake and an assembly method thereof

Abstract

The application discloses a kind of assembled detection devices for parking brake and its assembly method, belong to brake assembly field.The assembled detection device includes support body, press-pack assembly and force-limiting guide assembly.The force-limiting guide assembly includes limit expansion sleeve installed on the pressing rod with predetermined interference force, elastic member arranged in the support body and abutting against the limit expansion sleeve, and first sensor suitable for detecting the position and / or motion state of the elastic member and / or limit expansion sleeve and connected with the power source signal.The application seals the force-limiting guide assembly, and achieves the purpose of press-pack force value being less than maximum installation friction force value by the combination of pressing rod, disc spring and limit expansion sleeve, reduces the scrap rate of sealing assembly, and solves the problem of abnormal scrap caused by abnormal overturning of sealing assembly during assembly process.

Description

Technical Field

[0001] This invention belongs to the field of brake assembly, and in particular to an assembly and testing device and assembly method for parking brakes. Background Technology

[0002] The parking brake product uses a spring to apply axial positive pressure, pushing a piston to act on the moving and stationary friction pad assembly, thereby providing braking torque when the vehicle is parked. The spring force must simultaneously meet the following two conditions: 1. The spring pushes the piston to press the moving and stationary friction pad assembly tightly. Under the action of the spring force, the moving and stationary pads and the spline shaft assembly brake the wheel. At this time, the braking torque must be just enough to stop the vehicle from moving; the spring force value is F1. 2. Under the action of hydraulic pressure, the piston compresses the spring in the opposite direction, releasing the moving and stationary friction pad assembly from the spring force and allowing the wheel to roll freely; the spring force value at this time is F2. That is, under spring compression height 1, F1 must be greater than the limit value Fa, while under spring compression height 2, F2 must be less than the hydraulic pressure Fb. This ensures that the product's braking torque is met while preventing abnormal wheel overheating due to dragging and wear during use. In this technical context, accurate measurement of the actual installation height of the spring using a spring assembly limit intelligent detection mechanism is particularly important.

[0003] The radial piston seal of the parking brake product adopts the form of a Glyd ring. Due to problems such as short piston axial distance, housing chamfer not meeting theoretical design requirements, and substandard coaxiality accuracy of piston and housing, the outer ring of the Glyd ring is prone to flaring during assembly. When the seal flares, the frictional resistance is much greater than the theoretical frictional resistance value. Therefore, it is particularly important to use a sealing assembly force limiting guide device for piston assembly to reduce the scrap rate of sealing components. Summary of the Invention

[0004] To overcome the above-mentioned technical defects, the present invention provides an assembly and testing device for parking brakes to solve the problems involved in the background art.

[0005] The present invention provides an assembly and testing device for a parking brake, comprising: the parking brake including: a housing assembly, and a piston assembly installed within the housing assembly; the piston assembly including a piston body and a Glyd ring installed in a groove of the piston body;

[0006] The assembly testing device includes:

[0007] A support body, wherein the housing assembly is detachably mounted below the support body, and the piston assembly is placed inside the housing assembly;

[0008] The press-fit assembly includes a power source mounted above the support body, a pressure rod connected to the output end of the power source and extending through the support body into the housing assembly, and a pressure ring fixedly mounted at the bottom of the pressure rod and abutting against the piston assembly;

[0009] The force-limiting guide assembly includes a limiting expansion sleeve mounted on the pressure rod with a predetermined interference force, an elastic element disposed in the support body and abutting against the limiting expansion sleeve, and a first sensor adapted to detect the position and / or movement state of the elastic element and / or the limiting expansion sleeve and signal-connected to the power source.

[0010] Preferably or optionally, the elastic element is a disc spring assembly.

[0011] Preferably or optionally, the interference force of the pressure rod and the limiting expansion sleeve is less than the dynamic friction force between the Gladley ring and the housing assembly under abnormal deformation.

[0012] Preferably or optionally, the first sensor is a displacement sensor that detects the deformation of the elastic element.

[0013] Preferably or optionally, the pressure rod has a T-shaped structure and is connected to the power source via an adapter plate.

[0014] Preferably or optionally, a second sensor is also provided on the support body to detect the axial movement stroke of the piston assembly.

[0015] Preferably or optionally, the second sensor is an embedded displacement sensor.

[0016] The present invention also provides an assembly method for the assembly and testing device for the parking brake, comprising:

[0017] The piston assembly is placed in the inner hole of the housing assembly, and the housing assembly is installed below the support in a detachable manner.

[0018] Start the power source. The power source moves the piston assembly axially downward through the pressure rod and pressure ring until the piston assembly is pressed into the stop position of the housing assembly.

[0019] When the first sensor receives information about the reverse movement of the elastic element and / or the limiting sleeve, the power source stops operating.

[0020] Preferably or optionally, it further includes:

[0021] The second sensor detects the axial movement of the piston assembly;

[0022] A gasket of predetermined thickness is fitted on the outside of the piston assembly; when the data H1 value collected by the second sensor is greater than the rated stroke value H, the gasket thickness H1-H is increased; when the data H2 value collected by the wear sensor is less than H, the gasket thickness H-H2 needs to be reduced after the product assembly is completed.

[0023] Preferably or optionally, it further includes:

[0024] A spring assembly is disposed between the gasket and the housing assembly, and a rear end cover assembly is assembled thereon.

[0025] This invention relates to an assembly and testing device for parking brakes, which has the following advantages compared to the prior art:

[0026] 1. This invention uses a sealed assembly of a force-limiting guide component, and employs a combination of a pressure rod, disc spring, and limiting expansion sleeve to achieve a pressing force value that is less than the maximum installation friction force value, thereby reducing the scrap rate of the sealing component and solving the problem of abnormal scrap caused by abnormal rotation of the sealing component during assembly.

[0027] 2. The present invention uses a disc spring assembly as an elastic element. The disc spring assembly can be precisely designed to provide a preset reverse force within a limited space, which not only improves the accuracy and reliability of the assembled testing device, but also optimizes its stability and maintenance convenience in long-term use.

[0028] 3. The appropriate interference fit design of the present invention ensures that the press-fit assembly can stably transmit the required pressure during operation without causing unnecessary additional stress, ensuring that the piston assembly can be accurately positioned and form a good sealing effect, thereby improving the overall performance and reliability of the parking brake.

[0029] 4. The present invention uses a displacement sensor to detect the deformation of the elastic element, which can measure the minute displacement changes of the elastic element during the pressing process in real time and accurately. It is an effective means to achieve precision control, improve product quality and production efficiency, and ensure assembly safety.

[0030] 5. The T-shaped compression bar design of this invention can enhance the rigidity and stability of the compression bar under stress. Compared with a single-diameter bar, the T-shaped cross-section can provide better resistance to bending moment, thereby enhancing the structural stability and operational flexibility of the entire assembly and testing device.

[0031] 6. This invention uses a second sensor to measure the actual installation height of the spring during assembly, ensuring that the installation height of the parking brake spring matches the limit requirements. Based on this, mounting shims are selected to adjust the spring installation height, thereby meeting the braking force requirements.

[0032] 7. The present invention employs an embedded design of a second sensor to provide accurate displacement data, which, combined with a shim adjustment strategy, constitutes a closed-loop quality control process, improving the assembly quality and final braking performance of the parking brake.

[0033] 8. The assembly and testing method of the present invention not only ensures the precise installation of the piston assembly, but also achieves high assembly accuracy and product consistency through real-time monitoring and timely adjustment by sensors. At the same time, it takes into account wear compensation for long-term use, and achieves strict control over the manufacturing precision and product quality of the parking brake. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the parking brake in this invention.

[0035] Figure 2 This is a schematic diagram of the assembly and testing device in this invention.

[0036] Figure 3 This is a cross-sectional schematic diagram of the assembled detection device in this invention.

[0037] Figure 4 This is a schematic diagram of the initial installation of the piston assembly in this invention.

[0038] Figure 5 This is a schematic diagram of the piston assembly in the present invention with the piston in place.

[0039] The reference numerals in the attached figures are as follows: 110, housing assembly; 120, piston assembly; 130, gasket; 140, spring assembly; 150, connecting shaft; 160, friction plate assembly; 170, rear end cover assembly; 121, piston body; 122, Glyd ring; 210, support body; 211, support pressure plate; 212, spiral outer shell; 220, power source; 221, adapter plate; 230, pressure rod; 240, pressure ring; 250, limiting expansion sleeve; 260, elastic element; 270, second sensor. Detailed Implementation

[0040] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0041] Before introducing the assembly and testing device in this embodiment, the structure of the parking brake will be explained first, please refer to the appendix. Figure 1The parking brake includes: a housing assembly 110, a piston assembly 120, a gasket 130, a spring assembly 140, a connecting shaft 150, a friction plate assembly 160, and a rear end cover assembly 170.

[0042] The piston assembly 120 is mounted inside the housing assembly 110. The piston assembly 120 includes a piston body 121 and a Glyd ring 122 installed in a groove within the piston body 121. The piston body 121 and the housing assembly 110 are clearance-fitted, and the Glyd ring 122 seals the piston assembly 120 to the housing assembly 110, forming a live hydraulic cylinder structure. By circulating hydraulic oil within the hydraulic structure, the piston assembly 120 can move to one side relative to the housing assembly 110. A spring assembly 140 is located at the other end of the piston assembly 120, enabling the piston assembly 120 to move to the other side relative to the housing assembly 110 to meet the product's braking force requirements.

[0043] Because the axial force of the parking brake spring assembly should be greater than the Fa value to meet the product's braking force requirements, and the axial force of the spring assembly should be less than the Fb value, the goal of achieving brake hydraulic release function under the premise of return oil pressure threshold must be achieved. Based on the above functional requirements, the installation height of the parking brake spring assembly 140 needs to match the limit requirements. Therefore, a shim 130 of predetermined thickness is provided between the piston assembly 120 and the spring assembly 140 to meet the braking force requirements. After the parking brake wears out, the wear compensation of the friction pad assembly 160 can also be compensated by adjusting the thickness of the shim 130.

[0044] The rear cover assembly 170 is sealed to the housing assembly 110, forming a closed cavity for mounting core components such as the piston assembly 120, gasket 130, spring assembly 140, friction plate assembly 160, and connecting shaft 150. The friction plate assembly 160 is located at one end of the piston assembly 120 and connected to it. The spring assembly 140 is adapted to push the piston assembly 120 to press the friction plate assembly to achieve braking. It can be understood that the friction plate assembly 160 is drive-connected to the rotating shaft to be parked.

[0045] Furthermore, the connecting shaft 150 is an optional component, selected appropriately based on the structure of the parking brake. In this embodiment, one end of the connecting shaft 150 is mounted on the rear end cover via a bearing, and passes through the piston assembly 120 and the friction plate assembly 160, serving a guiding and fixing function. The piston assembly 120 and the friction plate assembly 160 are fitted onto the connecting shaft 150. The inner wall of the piston assembly 120 and the connecting shaft 150 have a clearance fit to ensure the stability of the piston assembly 120 and the friction plate assembly 160 along the axial direction. The friction plate assembly 160 and the connecting shaft 150 have an interference fit, and the connecting shaft 150 enables the friction plate assembly 160 to be connected to the rotating shaft to be parked.

[0046] See appendix Figures 2 to 4 This embodiment provides an assembly and testing device for a parking brake, comprising a support body 210, a press-fit assembly, and a force-limiting guide assembly.

[0047] The support body 210 serves as the foundation of the entire device, supporting the housing assembly 110 and the piston assembly 120, and providing space for installing the press-fitting components. Specifically, the support body 210 includes a support plate 211 and a spiral outer shell 212. The support plate 211 provides the main support. The housing assembly 110 is detachably mounted below the support plate 211, and the piston assembly 120 is placed inside the housing assembly 110. The support plate 211 is fixed to the spiral outer shell in the middle by a threaded connection, and the interior of the spiral outer shell is used to accommodate the force-limiting guide component.

[0048] The press-fit assembly includes a power source 220 mounted above the support 210, a pressure rod 230 connected to the output end of the power source 220 and extending through the support 210 into the housing assembly 110, and a pressure ring 240 fixedly mounted on the bottom of the pressure rod 230 and abutting against the piston assembly 120. The power source 220 is a cylinder assembly, and the pressure rod 230 has a T-shaped structure and is connected to the power source 220 through an adapter plate 221. The cylinder assembly is connected to the pressure rod 230 through the cylinder adapter plate 221. Under the action of air pressure, the cylinder assembly pushes the pressure rod 230 and the pressure ring 240 to move axially downward, thereby pressing and installing the piston assembly 120.

[0049] The force-limiting guide assembly includes a limiting expansion sleeve 250 mounted on the pressure rod 230 with a predetermined interference force, an elastic element 260 disposed within the support body 210 and abutting against the limiting expansion sleeve 250, and a first sensor adapted to detect the position and / or movement state of the elastic element 260 and / or the limiting expansion sleeve 250, and signal-connected to the power source 220. The first sensor is a displacement sensor for detecting the deformation of the elastic element 260. The elastic element 260 is a disc spring assembly that transmits elastic force. The elastic element 260 forms an axially upward buffer resistance against the limiting expansion sleeve 250. Within the piston installation stroke, the axial buffer resistance of the elastic element 260 is less than the interference force of the spring pressure ring 240 and the limiting expansion sleeve. When the piston assembly 120 moves abnormally axially, the dynamic friction force generated between the Glyd ring 122 under compression and the housing assembly 110 is greater than the interference force of the spring pressure ring 240 and the limiting expansion sleeve 250. Under the action of the disc spring assembly, the limiting expansion sleeve 250 is displaced axially upward. The first sensor receives the reverse movement information of the limiting expansion sleeve 250, and the cylinder assembly stops operating, thereby protecting the Glyd ring 122 from abnormal compression deformation.

[0050] By sealing and assembling a force-limiting guide assembly within the housing assembly 110, the pressing force is made less than the maximum installation friction force, thus reducing the scrap rate of the sealing assembly (i.e., the Glyd ring 122). The chamfer range of the contact position between the housing assembly 110 and the sealing assembly is 20° to 30°. During installation, the power source 220 pushes the pressure rod 230, which in turn drives the limiting expansion sleeve 250 to compress the disc spring and axially push the pressure ring 240 to apply positive pressure to the piston, causing it to overcome the frictional resistance between the sealing assembly and the housing and move axially. When the piston sealing assembly moves abnormally, the frictional resistance exceeds the interference force between the intermediate rod and the limiting expansion sleeve 250. Under the thrust of the disc spring, the limiting expansion sleeve 250 undergoes reverse displacement. The first sensor receives a reverse signal, and the power source 220 stops working. When the piston sealing assembly moves normally, the power source 220 pushes the pressure ring 240 to compact the piston assembly 120 and slowly place it into the final installation position. The first sensor receives an installation displacement signal, and the power source 220 stops working.

[0051] In a further embodiment, a second sensor 270 is provided on the support 210 to detect the axial movement of the piston assembly 120, i.e., to measure the actual installation height of the spring. The second sensor 270 is an embedded displacement sensor, with the displacement at the installation position set to zero. The sensor probe contacts the piston assembly 120 and moves axially with the piston under the action of the spring force. When the piston is installed in place, the current displacement is output through a multi-channel digital display module, ultimately obtaining the difference between the actual spring installation height and the theoretical value. Based on this, the mounting shim 130 is selected to adjust the spring installation height, thereby meeting the braking force requirements.

[0052] To facilitate understanding of the technical solution for the assembly and testing device for parking brakes, its assembly method is briefly explained:

[0053] Step 1: After stretching and assembling the Glyd ring 122 by using the compression ring sleeve, the Glyd ring 122 returns to its initial state, thus completing the assembly of the piston assembly 120.

[0054] Step 2: Place the piston assembly 120 in the inner hole of the housing assembly 110, and install the housing assembly 110 in a detachable manner under the support 210;

[0055] Step 3: Start the power source 220. The power source 220 moves axially downward through the pressure rod 230 and the pressure ring 240 to push the piston assembly 120 to move axially downward until the piston assembly 120 is pressed into the stop position of the housing assembly 110.

[0056] Step 4: When the first sensor receives information about the reverse movement of the elastic element 260 and / or the limiting expansion sleeve 250, the power source 220 stops operating; when the piston sealing assembly moves normally, the first sensor receives an installation displacement signal, and the power source 220 stops working.

[0057] Step 5: While performing step 4, the second sensor 270 detects the axial movement stroke of the piston assembly 120, and then assembles a gasket 130 of predetermined thickness on the outside of the piston assembly 120; when the data H1 value collected by the second sensor 270 is greater than the rated movement stroke value H, the gasket 130 of thickness H1-H is increased; when the data H2 value collected by the wear sensor is less than H, the gasket 130 of thickness H-H2 needs to be reduced after the product assembly is completed.

[0058] Step 6: Provide a spring assembly 140 between the gasket 130 and the housing assembly 110, and assemble the connecting shaft 150 and the rear end cover assembly 170.

[0059] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. An assembly and testing device for a parking brake, characterized in that, The parking brake includes: a housing assembly (110), and a piston assembly (120) installed in the housing assembly (110); the piston assembly (120) includes a piston body (121) and a Glyd ring (122) installed in a groove of the piston body (121); The assembly testing device includes: A support body (210) is provided, and the housing assembly (110) is detachably mounted below the support body (210). The piston assembly (120) is placed inside the housing assembly (110). The press assembly includes a power source (220) mounted above the support (210), a pressure rod (230) connected to the output end of the power source (220) and extending through the support (210) into the housing assembly (110), and a pressure ring (240) fixedly mounted on the bottom of the pressure rod (230) and abutting against the piston assembly (120); The force-limiting guide assembly includes a limiting sleeve (250) mounted on the pressure bar (230) with a predetermined interference force, an elastic element (260) disposed in the support body (210) and abutting against the limiting sleeve (250), and a first sensor adapted to detect the position and / or movement state of the elastic element (260) and / or the limiting sleeve (250) and signal-connected to the power source (220); The interference force of the pressure bar (230) and the limiting expansion sleeve (250) is less than the dynamic friction force of the abnormal deformation of the glyd ring (122) and the housing assembly (110).

2. The assembly and testing device for parking brakes according to claim 1, characterized in that, The elastic element (260) is a disc spring assembly.

3. The assembly and testing device for parking brakes according to claim 1, characterized in that, The first sensor is a displacement sensor that detects the deformation of the elastic element (260).

4. The assembly and testing device for parking brakes according to claim 1, characterized in that, The pressure rod (230) has a T-shaped structure and is connected to the power source (220) through the adapter plate (221).

5. The assembly and testing device for parking brakes according to claim 1, characterized in that, A second sensor (270) is also provided on the support (210) to detect the axial movement of the piston assembly (120).

6. The assembly and testing device for parking brakes according to claim 5, characterized in that, The second sensor (270) is an embedded displacement sensor.

7. An assembly method for a parking brake assembly and testing device based on claim 5 or 6, characterized in that, include: The piston assembly (120) is placed in the inner hole of the housing assembly (110), and the housing assembly (110) is installed below the support (210) in a detachable manner; Start the power source (220), and the power source (220) moves axially downward through the pressure rod (230) and pressure ring (240) to push the piston assembly (120) to move axially downward until the piston assembly (120) is pressed into the stop position of the housing assembly (110); When the first sensor receives information about the reverse movement of the elastic element (260) and / or the limiting sleeve (250), the power source (220) stops operating.

8. The assembly method of the parking brake assembly and testing device according to claim 7, characterized in that, Also includes: The second sensor (270) detects the axial movement of the piston assembly (120); A gasket (130) of predetermined thickness is fitted on the outside of the piston assembly (120); when the data H1 value collected by the second sensor (270) is greater than the rated stroke value H, the gasket (130) of thickness H1-H is increased; when the data H2 value collected by the second sensor (270) is less than H, the gasket (130) of thickness H-H2 needs to be reduced after the product assembly is completed.

9. The assembly method of the parking brake assembly and testing device according to claim 8, characterized in that, Also includes: A spring assembly (140) is disposed between the gasket (130) and the housing assembly (110), and a rear end cover assembly (170) is assembled thereon.

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