Brake for transmission

Abstract

According to the brake for the transmission, when the brake is used, abrasion and noise caused by relative movement between the intermediate shaft serving as a rotating part and the piston of the brake do not exist, and compared with the prior art, noise pollution is reduced. In addition, due to the fact that the installation positions of the dual discs are optimized, the intermediate shaft can be designed to be of a hollow structure, the overall mass is reduced, meanwhile, the structure of a brake piston is simplified, the effect of reducing the machining and manufacturing difficulty is achieved, and the brake piston is suitable for large-scale application and popularization in the industry.

Description

Technical Field

[0001] This utility model belongs to the field of transmissions, and specifically relates to a brake for transmissions. Background Technology

[0002] In recent years, in the commercial vehicle market, users have become increasingly accepting of automatic transmissions, and automated manual transmissions (AMT) are gradually becoming one of the main trends. Users are also increasingly demanding higher reliability and comfort from AMT transmissions. The brake is one of the key components of an AMT transmission, primarily used to brake the intermediate shaft during upshifts, thereby synchronizing the speeds of the primary and secondary shafts and completing the shift.

[0003] In existing technology, on the one hand, the top pin is pressed by a spring between the brake piston and the intermediate shaft. When the intermediate shaft rotates, due to the sealing ring on the piston, the resistance between the piston and the brake cylinder is relatively large. Therefore, there may be relative movement between the intermediate shaft and the spring, the spring and the top pin, and the top pin and the brake piston, which will generate metal friction, ultimately resulting in abnormal wear and noise, which is unacceptable to users. On the other hand, the requirements for lightweight transmissions are becoming increasingly stringent. Existing technology mounts the return spring on the end of the intermediate shaft, which prevents the intermediate shaft from being designed as a hollow structure, thus increasing the weight of the transmission. Utility Model Content

[0004] The purpose of this invention is to provide a brake for a transmission to solve the problems of high noise and heavy weight of transmissions in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A brake for a transmission includes a transmission housing and a brake cylinder, wherein the brake cylinder has an air inlet, a brake piston is slidably disposed inside the brake cylinder, and an intermediate shaft capable of rotating around a central axis is disposed inside the transmission, characterized in that the transmission housing is connected to the brake cylinder; and the transmission housing has a plurality of mounting holes.

[0007] The intermediate shaft is fitted with a friction plate and a mating plate at one end near the brake piston; the semi-circular notch of the mating plate is aligned with the mounting holes of the transmission housing, and a locating pin is installed in each mounting hole.

[0008] The brake piston can press against or move away from the friction pad by sliding inside the brake cylinder.

[0009] An annular space is formed between the brake cylinder, the brake piston, and the boss of the transmission housing. A washer and a compression spring are provided in the annular space, and the washer is installed on the boss of the transmission housing.

[0010] This utility model also has the following features:

[0011] Furthermore, the intermediate shaft is a hollow shaft.

[0012] Furthermore, at least one sealing ring groove is provided on the outer wall of the brake piston, and a matching sealing ring is provided in the sealing ring groove.

[0013] Furthermore, the sealing ring is a lip-shaped sealing ring.

[0014] Furthermore, a support ring groove is provided on the outer wall of the brake piston, and a matching support ring is provided in the support ring groove.

[0015] Furthermore, a gasket is provided between the transmission housing and the brake cylinder.

[0016] Furthermore, the intermediate shaft is rotatably mounted inside the transmission via bearings.

[0017] Compared with the prior art, this utility model has the following technical effects:

[0018] The brake for a transmission of this invention eliminates wear and noise caused by relative motion between the intermediate shaft (a rotating component) and the brake piston during use, thus reducing noise pollution compared to existing technologies. Furthermore, by optimizing the mounting position of the mating plates, the intermediate shaft can be designed as a hollow structure, reducing overall weight and simplifying the brake piston structure. This reduces manufacturing difficulty and makes it suitable for large-scale industrial use and promotion. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the brake for a transmission according to this utility model;

[0020] Figure 2 This is a schematic diagram showing the connection relationship between the intermediate shaft, friction plate, and mating plate in this utility model;

[0021] Figure 3 yes Figure 1 Enlarged view of the S-section;

[0022] Figure 4 This is a schematic diagram showing the connection relationship between the transmission housing and the mating plate in this utility model.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 1. Gearbox housing; 2. Brake cylinder; 3. Air inlet; 4. Brake piston; 5. Locating pin; 6. Friction plate; 7. Coupled plate; 8. Semi-circular notch; 9. Washer; 10. Compression spring; 11. Sealing ring; 12. Support ring; 13. Gasket; 14. Bearing; 15. Central shaft. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, all components in this invention are known in the prior art. For example, the dual plate uses a commonly known dual plate.

[0026] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0027] like Figures 1 to 2 As shown, a brake for a transmission includes a transmission housing 1 and a brake cylinder 2. The brake cylinder 2 has an air inlet 3 and a brake piston 4 is slidably disposed inside the brake cylinder 2. An intermediate shaft 15 capable of rotating around a central axis is disposed inside the transmission. The transmission housing 1 is connected to the brake cylinder 2, and the transmission housing 1 has multiple mounting holes.

[0028] Friction plate 6 and mating plate 7 are fitted on one end of intermediate shaft 15 near brake piston 4; the semi-circular notch 8 of mating plate 7 is aligned with the mounting holes of transmission housing 1 one by one, and a locating pin 5 is installed in each mounting hole.

[0029] The brake piston 4 can squeeze or move away from the friction pad 6 by sliding inside the brake cylinder 2;

[0030] An annular space is formed between the brake cylinder 2, the brake piston 4 and the boss of the transmission housing 1. A washer 9 and a compression spring 10 are provided in the annular space. The washer 9 is installed on the transmission housing 1.

[0031] Specifically, a gasket 13 is provided between the transmission housing 1 and the brake cylinder 2.

[0032] The intermediate shaft 15 is rotatably mounted inside the gearbox via bearing 14.

[0033] The brake piston 4 is installed in the brake cylinder 2; the friction plate 6 and the mating plate 7 are mounted on the intermediate shaft, and the connection method is selected according to convention, such as spline connection.

[0034] Meanwhile, the mating piece 7 has multiple semi-circular notches 8. For example Figure 4 As shown, these semi-circular notches 101 are aligned with the mounting holes on the gearbox housing;

[0035] A locating pin is mounted on the gearbox housing 1 to keep the mating plates 7 circumferentially stationary with respect to the gearbox housing 1; the brake cylinder 4 is bolted to the gearbox housing 1 to create an annular region S, as shown below. Figure 3 As shown, washer 9 and compression spring 10 are installed in the annular region S, and washer 9 is installed on the boss of transmission housing 1.

[0036] The working process of the device in this embodiment is as follows:

[0037] When braking is required, compressed air enters the brake cylinder 2 through the air inlet 3. The brake piston 4 compresses the spring force of the spring 10 and squeezes the friction plate 6 and the mating plate 7 towards the gearbox housing 1, causing the speed of the intermediate shaft 15 to decrease.

[0038] When braking ends, compressed air is discharged from the air inlet 3, and the compression spring 10 pushes the brake piston 4 to move towards the brake cylinder 2, thereby releasing the compression on the friction plate 6 and the mating plate 7, and the intermediate shaft 15 resumes normal rotation.

[0039] As a preferred option, the intermediate shaft 15 is a hollow shaft, which reduces weight.

[0040] As a preferred embodiment, at least one sealing ring groove is provided on the outer wall of the brake piston 4, and a matching sealing ring 11 is provided in the sealing ring groove.

[0041] Further preferably, the sealing ring 11 is a lip-shaped sealing ring, which enhances the overall airtightness.

[0042] As a preferred embodiment, a support ring groove is formed on the outer wall of the brake piston 4, and a matching support ring 12 is provided in the support ring groove. The support ring 12 plays a supporting role and enhances the structural strength of the overall device.

Claims

1. A brake for a transmission, comprising a transmission housing (1) and a brake cylinder (2), wherein the brake cylinder (2) has an air inlet (3), a brake piston (4) is slidably disposed inside the brake cylinder (2), and an intermediate shaft (15) rotatable about a central axis is disposed inside the transmission, characterized in that, The transmission housing (1) is connected to the brake cylinder (2); the transmission housing (1) is provided with multiple mounting holes; The intermediate shaft (15) is fitted with a friction plate (6) and a mating plate (7) at one end near the brake piston (4); the semi-circular notch (8) of the mating plate (7) is aligned with the mounting holes of the transmission housing (1) one by one, and a positioning pin (5) is installed in each mounting hole. The brake piston (4) can squeeze or move away from the friction plate (6) by sliding inside the brake cylinder (2); An annular space is formed between the brake cylinder (2), the brake piston (4) and the boss of the transmission housing (1). A washer (9) and a compression spring (10) are provided in the annular space. The washer (9) is installed on the boss of the transmission housing (1).

2. The brake for a transmission as claimed in claim 1, characterized in that, The intermediate shaft (15) is a hollow shaft.

3. The brake for a transmission as described in claim 1, characterized in that, At least one sealing ring groove is provided on the outer wall of the brake piston (4), and a matching sealing ring (11) is provided in the sealing ring groove.

4. The brake for a transmission as described in claim 3, characterized in that, The sealing ring (11) is a lip-shaped sealing ring.

5. The brake for a transmission as claimed in claim 1, characterized in that, The brake piston (4) has a support ring groove on its outer wall, and a matching support ring (12) is provided in the support ring groove.

6. The brake for a transmission as claimed in claim 1, characterized in that, A gasket (13) is provided between the transmission housing (1) and the brake cylinder (2).

7. The brake for a transmission as claimed in claim 1, characterized in that, The intermediate shaft (15) is rotatably mounted inside the gearbox via a bearing (14).

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