Piston sealing structure for intermediate shaft brake of AMT gearbox and intermediate shaft brake of AMT gearbox

Abstract

The utility model relates to a sealing structure, in particular to a piston sealing structure for an intermediate shaft brake of an AMT gearbox and the intermediate shaft brake, and aims to solve the problems that an existing piston sealing structure is prone to causing abnormal gear shifting and serious abrasion of the gearbox. The oil ring comprises a circular-ring-shaped supporting and expanding device and circular-ring-shaped oil scraping rings which are fixedly connected to the upper end face and the lower end face of the supporting and expanding device respectively. The two oil scraper rings are parallel to the end face of one end of the brake cylinder; the inner end face of the supporting and expanding device is fixedly connected with the bottom end of the third groove, and a gap exists between the outer end face of the supporting and expanding device and the inner side face of the brake air cylinder. The outer end faces of the two oil scraper rings are in an arc transition shape, the inner end faces of the two oil scraper rings are in interference fit with the bottom end of the third groove, and the outer end faces of the two oil scraper rings are in clearance fit with the inner side face of the brake air cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to a middle shaft brake, concretely relates to a piston sealing structure for AMT gearbox middle shaft brake and AMT gearbox middle shaft brake. BACKGROUND

[0002] With the rapid development of the automobile industry, people have higher and higher requirements for the driving comfort, cost and efficiency of commercial vehicles. At present, some vehicles matching the electrically controlled mechanical automatic transmission on the market are prone to problems such as long starting time, starting jitter, long gear shifting time and gear shifting jerk. In the running process of the vehicle, the middle shaft brake will directly affect the gear shifting comfort and gear shifting time of the vehicle, and it is urgent to improve it.

[0003] For the above problems, Chinese patent CN115182944A discloses a middle shaft brake sealing positioning structure, see Figure 1 which comprises a brake cylinder 2, a brake piston 1 arranged in the brake cylinder 2, a gas pipe 3 arranged at one end of the brake cylinder 2 and connected in communication with a high-pressure gas source inside the gearbox, and a gas ring 4, a support ring 5 and an oil ring 6 respectively sleeved and clamped on the side of the brake piston 1 and close to the end face of one end of the brake cylinder 2 through the first groove 41, the second groove 51 and the third groove 61 arranged on the side of the brake piston 1, and the gas ring 4, the support ring 5 and the oil ring 6 are arranged in order from near to far from the end face of one end of the brake cylinder 2; the gas ring 4, the support ring 5 and the oil ring 6 are arranged in contact with the brake cylinder 2. The gas ring 4 and the oil ring 6 are both K-shaped sealing rings with single lip. The gas ring 4 and the support ring 5 arranged in the sealing positioning structure effectively prevent gas from the whole vehicle from entering the inside of the transmission from the side of the brake piston 1, and at the same time prevent the transmission oil from entering the inside of the brake piston 1 and the brake cylinder 2, and the support ring 5 effectively realizes the positioning and support of the brake piston 1 and the brake cylinder 2, avoiding the wear caused by the direct contact of the brake piston 1 and the brake cylinder cover, and effectively reducing the impurities in the cylinder. The sealing positioning structure has the beneficial effects of reasonable design, convenient installation, good sealing effect and effective improvement of the braking effect of the middle shaft brake. However, the patent has the following deficiencies: in the actual application process of the product, a large amount of metal abrasion exists in the gearbox oil, and the metal abrasion will move to the space between the oil ring 6 and the brake cylinder 2 during the reciprocating motion of the brake piston, and since the oil ring 6 of the brake is generally made of rubber, its hardness is lower than that of the metal abrasion, so the lip sealing ring of the rubber oil ring is prone to failure, which causes the oil in the gearbox to enter other electronic components, and the gearbox gear shifting is prone to abnormality, and if the traditional K-shaped sealing ring is used for the oil ring 6, the abrasion will be more serious. UTILITY MODEL CONTENTS

[0004] The purpose of this invention is to solve the problems that existing piston sealing structures easily lead to abnormal gear shifting and severe wear of the sealing rings in the gearbox, and to provide a piston sealing structure for the intermediate shaft brake of an AMT gearbox and an intermediate shaft brake.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A piston sealing structure for an intermediate shaft brake in an AMT transmission includes a brake cylinder, a brake piston disposed within the brake cylinder, an air pipe disposed at one end of the brake cylinder and connected to a high-pressure air source inside the transmission, and a gas ring, a support ring, and an oil ring respectively sleeved and engaged with the side of the brake piston and located near the end face of the brake cylinder via a first groove, a second groove, and a third groove disposed on the side of the brake piston, with the gas ring, support ring, and oil ring arranged sequentially from near to far from the end face of the brake cylinder; its special feature is:

[0007] The oil ring includes an annular expander and an annular scraper rings fixed to the upper and lower ends of the expander, respectively; both scraper rings are arranged parallel to one end face of the brake cylinder.

[0008] The inner end face of the expander is fixedly connected to the bottom end of the third groove, and there is a gap between the outer end face of the expander and the inner side of the brake cylinder; the outer end faces of the two oil scraper rings are both arc-shaped transitions, and the inner end faces of the two oil scraper rings are both interference fits with the bottom wall of the third groove, while the outer end faces of the two oil scraper rings are both clearance fits with the inner wall of the brake cylinder.

[0009] Furthermore, both of the outer end faces of the oil scraper rings are coated with a DLC coating.

[0010] Furthermore, both of the aforementioned oil scraper rings are made of ordinary carbon steel.

[0011] Furthermore, the gas ring is a K-type sealing ring.

[0012] Furthermore, a fourth annular groove is provided in the middle of the inner end face of the expansion device.

[0013] Meanwhile, this utility model also provides an intermediate shaft brake for an AMT transmission, which is special in that:

[0014] This includes the piston seal structure described above for the intermediate shaft brake of an AMT transmission.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. The piston sealing structure for the intermediate shaft brake of the AMT gearbox, the structure of the oil ring is improved, so that during operation, not only can prevent the transmission oil from entering the brake cylinder and the inside of the brake piston, but also can ensure that the piston can smoothly reciprocate, reduce the occurrence of wear phenomenon;

[0017] 2. The piston sealing structure for the intermediate shaft brake of the AMT gearbox, the material of the two oil scraping rings is ordinary carbon steel, and DLC (diamond-like) coating is coated on the outer end face, which effectively solves the problems of low tensile resistance of the brake cylinder, easy wear and short service life, and the hardness is high, which can avoid the sealing failure problem caused by metal abrasion, and significantly reduces the risk of cylinder assembly oil leakage during the working process of the intermediate shaft brake;

[0018] 3. The piston sealing structure for the intermediate shaft brake of the AMT gearbox, the inner end face of the supporting expander is provided with a fourth groove, which can not only reduce the weight, but also increase the toughness of the connection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the existing intermediate shaft brake sealing positioning structure;

[0020] Figure 2 It is a structural schematic view of the piston sealing structure for the intermediate shaft brake of the AMT gearbox of the utility model;

[0021] Figure 3 It is an enlarged view of A of Figure 2

[0022] Figure 4 It is an enlarged view of B of Figure 3

[0023] REFERENCE SIGNS:

[0024] 1. Brake piston; 2. Brake cylinder; 3. Air pipe; 4. Air ring; 5. Supporting ring; 6. Oil ring; 41. First groove; 51. Second groove; 61. Third groove; 7. Oil scraping ring; 8. Supporting expander; 9. DLC coating; 10. Fourth groove. DETAILED DESCRIPTION

[0025] The utility model will be further described in combination with the drawings and specific embodiments.

[0026] A piston sealing structure for the intermediate shaft brake of the AMT gearbox, referring to Figure 1 ​​, including a brake cylinder 2, a brake piston 1 arranged in the brake cylinder 2, a gas pipe 3 arranged at one end of the brake cylinder 2 and connected to a high-pressure gas source inside the gearbox, and a gas ring 4, a support ring 5 and an oil ring 6 respectively sleeved and clamped on the side of the brake piston 1 and close to the end face of one end of the brake cylinder 2 through the first groove 41, the second groove 51 and the third groove 61 arranged on the side of the brake piston 1, and the gas ring 4, the support ring 5 and the oil ring 6 are arranged in sequence from the end face of one end of the brake cylinder 2; wherein the gas ring 4 is a K-shaped sealing ring, and the model can be HNBR, which effectively controls the cost on the basis of effectively meeting the sealing performance, and the function is to prevent gas from the whole vehicle from entering the inside of the gearbox from one end of the brake piston 1, the function of the support ring 5 is to solve the wear problem of the brake piston 1 moving forward and backward, and the function of the oil ring 6 is to prevent the gearbox oil from entering the inside of the brake cylinder 2 and the brake piston 1.

[0027] The oil ring 6 in the embodiment is improved, see Figures 2-4 The rest of the structure is basically the same as Chinese patent CN115182944A, and will not be repeated here.

[0028] The oil ring 6 includes a circular supporting ring 8 and a circular oil scraping ring 7 fixed to the upper end face and the lower end face of the supporting ring 8 respectively; both of the oil scraping rings 7 are arranged in parallel with the end face of one end of the brake cylinder 2;

[0029] The inner end face of the supporting ring 8 is fixed to the bottom end of the third groove 61, and there is a gap between the outer end face of the supporting ring 8 and the inner side face of the brake cylinder 2; the outer end faces of the two oil scraping rings 7 are arc-shaped transition shapes, and the inner end faces of the two oil scraping rings 7 are in interference fit with the bottom wall face of the third groove 61, and the outer end faces of the two oil scraping rings 7 are in gap fit with the inner side wall face of the brake cylinder 2.

[0030] In order to solve the problems of easy wear and short service life of the oil ring 6, the materials of the two oil scraping rings 7 in the oil ring 6 are ordinary carbon steel, and DLC coating 9 is coated on the outer end faces of the two oil scraping rings 7. The DLC (diamond-like carbon) coating 9 has high hardness, which can avoid the sealing failure problem caused by metal abrasion, and significantly reduce the risk of cylinder assembly oil leakage during the operation of the intermediate shaft brake;

[0031] In order to reduce the weight and increase the connection strength, the fourth groove 10 is arranged in the middle of the inner end face of the supporting ring 8.

[0032] Particularly, the oil scraping ring 7 is in interference fit with the brake piston 1 and in clearance fit with the brake cylinder 2, which allows the brake piston 1 to have a certain space for movement in the brake cylinder 2, so as to ensure smooth reciprocating movement of the brake piston 1, reduce the possibility of wear and tear and effectively improve the sealing effect.

[0033] Meanwhile, the embodiment further provides the AMT gearbox intermediate shaft brake, which comprises the piston sealing structure for the AMT gearbox intermediate shaft brake.

Claims

1.A piston sealing structure for an AMT gearbox intermediate shaft brake, comprising a brake cylinder (2), a brake piston (1) arranged in the brake cylinder (2), a gas pipe (3) arranged at one end of the brake cylinder (2) and connected with a high-pressure gas source inside the gearbox, and a gas ring (4), a support ring (5) and an oil ring (6) respectively sleeved and clamped on the side of the brake piston (1) near the end face of the brake cylinder (2) through a first groove (41), a second groove (51) and a third groove (61) arranged on the side of the brake piston (1), and the gas ring (4), the support ring (5) and the oil ring (6) are arranged in sequence from the end face of the brake cylinder (2), characterized in that: the oil ring (6) comprises a circular supporting ring (8) and a circular oil scraping ring (7) fixed on the upper end face and the lower end face of the supporting ring (8) respectively; both the oil scraping rings (7) are arranged in parallel with the end face of the brake cylinder (2) ; the inner end face of the supporting ring (8) is fixed with the bottom end of the third groove (61), and there is a gap between the outer end face of the supporting ring (8) and the inner side of the brake cylinder (2) ; the outer end faces of the two oil scraping rings (7) are arc-shaped transition shapes, and the inner end faces of the two oil scraping rings (7) are in interference fit with the bottom wall of the third groove (61), and the outer end faces of the two oil scraping rings (7) are in gap fit with the inner wall of the brake cylinder (2). 2.The piston sealing structure for an AMT gearbox intermediate shaft brake according to claim 1, characterized in that: DLC coatings (9) are coated on the outer end faces of the two oil scraping rings (7). 3.The piston sealing structure for an AMT gearbox intermediate shaft brake according to claim 1, characterized in that: the materials of the two oil scraping rings (7) are ordinary carbon steel. 4.The piston sealing structure for an AMT gearbox intermediate shaft brake according to claim 1, characterized in that: the gas ring (4) is a K-shaped sealing ring. 5.The piston sealing structure for an AMT gearbox intermediate shaft brake according to any one of claims 1-4, characterized in that: a circular fourth groove (10) is arranged in the middle of the inner end face of the supporting ring (8). 6.An AMT gearbox intermediate shaft brake, characterized in that: it comprises the piston sealing structure for an AMT gearbox intermediate shaft brake according to any one of claims 1-5.

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