Sealing structure of automatic adjusting arm

Abstract

The utility model discloses a sealing structure of an automatic adjusting arm, which comprises a shell, a worm and gear assembly, a sealing assembly and an oil nozzle are arranged in the shell, and the sealing assembly comprises a sealing ring arranged at one end of a worm of the worm and gear assembly. The thrust washer, the thrust spring and the rear cover are installed at the other end of the worm of the worm and gear assembly and connected in sequence, the rear cover is connected with the shell through threads, and a check valve is arranged on the side, close to the thrust spring, of the rear cover. By means of the check valve installed on the rear cover, grease is injected into the inner cavity of the adjusting arm and the rear cover through the oil nozzle, old grease of a one-way valve of the rear cover is replaced, meanwhile, media outside the shell are prevented from entering the shell, internal parts are always in a good lubricating state, and the situation that a rubber sealing ring is extruded and deformed in the past is avoided. And moreover, the sealing layer is arranged at the rear cover and the shell, so that external moisture erosion is avoided, internal grease is prevented from being lost, and the sealing performance of the shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a sealing structure of an automatic adjusting arm. Background Art

[0002] Currently, the rear cover of the automatic clearance adjustment arm on the market adopts ordinary fine pitch thread to achieve sealing.

[0003] In the process of implementing the prior art, the inventor discovered that:

[0004] When the automatic clearance adjustment arm (hereinafter referred to as the automatic adjustment arm) is greased during the later maintenance, the newly injected grease often cannot reach the inner cavity of the rear cover due to the narrow passage from the oil nozzle to the rear cover and the relatively closed state of the rear cover. In this way, the grease in the inner cavity of the rear cover can only flow out but not in. Moreover, since the inner cavity of the adjustment arm is relatively closed, the instantaneous high pressure when the oil nozzle is greased can easily break through the rubber sealing rings in other parts of the adjustment arm, causing the internal parts to be exposed to external water vapor. In addition, since the vehicle is always in a state of impact and vibration when driving on the road, and the self-adjusting arm is installed on the vehicle chassis, the self-adjusting arm will be splashed by water and enter the internal corroded parts through the rear cover of the self-adjusting arm, causing the self-adjusting arm to fail early. Moreover, the grease at the rear cover can easily flow out through the gap between the screw threads.

[0005] Therefore, it is necessary to provide a sealing structure of an automatic clearance adjustment arm that can normally inject grease at the rear cover position and has high sealing performance to solve the technical problems of difficulty in injecting grease and poor sealing performance in the prior art. Utility Model Content

[0006] The main technical problem solved by the utility model is to solve the technical problems of difficulty in injecting grease and poor sealing performance in the prior art.

[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is:

[0008] Provided is a sealing structure for an automatic adjustment arm, comprising a housing, a worm gear assembly being arranged in the housing, a sealing assembly being connected to the worm of the worm gear assembly to form a seal, an oil nozzle of the worm gear assembly and the sealing assembly being connected to the turbine of the worm gear assembly and used for injecting grease into the housing, the sealing assembly comprising a sealing ring mounted on the housing and sleeved on one end of the worm of the worm gear assembly, a thrust washer mounted on the housing and sequentially connected to the other end of the worm of the worm gear assembly, a thrust spring and a rear cover, the rear cover being connected to the housing by threads, the rear cover being provided with a check valve located on the inner side of the spring on a side close to the thrust spring, for allowing the grease in the housing to flow out through the check valve and preventing the medium outside the housing from entering the housing.

[0009] In a preferred embodiment of the utility model, the rear cover is provided with a boss located inside the spring at the end surface close to the thrust spring, and the boss is provided with a through hole for installing the check valve.

[0010] In a preferred embodiment of the present invention, the check valve comprises at least one of a lift check valve and a butterfly check valve.

[0011] In a preferred embodiment of the utility model, the rear cover is connected to the housing through threads, the housing is provided with internal threads, and the rear cover has external threads, and is characterized in that a sealing layer is provided between the external threads of the rear cover and the internal threads of the housing;

[0012] The sealing layer is at least one of a sealant and a sealing tape.

[0013] In a preferred embodiment of the utility model, a first cavity and a second cavity communicated through a through hole are provided in the shell, the first cavity is used to install the turbine worm assembly, and the second cavity is used to install the thrust gasket, thrust spring and rear cover of the sealing assembly.

[0014] In a preferred embodiment of the present invention, the other end of the worm of the worm gear assembly of the first cavity is connected to the thrust washer in the second cavity through a through hole.

[0015] The beneficial effects of the utility model are as follows: the sealing structure of the automatic adjustment arm provided by the application realizes that the oil nozzle injects grease into the inner cavity of the adjustment arm and the rear cover through the check valve installed on the rear cover, replaces the old grease of the rear cover check valve, and prevents the medium outside the shell from entering the shell, so that the internal parts are always in a good lubrication state, avoiding the previous situation where the rubber sealing ring is squeezed and deformed. In addition, a sealing layer is set between the rear cover and the shell to prevent external moisture erosion and protect the internal grease from loss, thereby increasing the sealing performance of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a preferred embodiment of the sealing structure of the automatic adjustment arm provided by the utility model;

[0017] Figure 2 It is a structural schematic diagram of a preferred embodiment of the sealing structure of the automatic adjustment arm provided by the utility model without the housing;

[0018] Figure 3 It is a schematic structural diagram of a cross-section of a preferred embodiment of the sealing structure of the automatic adjustment arm provided by the utility model;

[0019] The components in the drawings are marked as follows: sealing structure of the automatic adjustment arm - 100; housing - 10;

[0020] First cavity-20; worm gear assembly-21; worm wheel-22; worm-23;

[0021] The second cavity-30; the sealing assembly-31; the sealing ring-311; the thrust washer-312; the thrust spring-313;

[0022] Rear cover-314; check valve-3141; boss-3142.

[0023] Oil nozzle - 40. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] See also Figures 1 to 3 The utility model applies to a sealing structure 100 of an automatic adjustment arm, comprising a housing 10, a worm gear assembly 21 is arranged in the housing 10, a sealing assembly 31 connected to the worm 23 of the worm gear assembly 21 to form a seal, an oil nozzle 40 connected to the turbine of the worm gear assembly 21 for injecting grease into the worm gear assembly 21 and the sealing assembly 31 in the housing 10, and the sealing assembly 31 comprises a worm gear 23 connected to the worm gear assembly 21 and a worm gear 23 connected to the worm gear assembly 21. A sealing ring 311 is provided at one end of the worm 23, a thrust washer 312, a thrust spring 313 and a rear cover 314 which are installed on the housing 10 and are connected in sequence to the other end of the worm 23 of the worm gear assembly 21. The rear cover 314 is connected to the housing 10 through threads. The rear cover 314 is provided with a check valve 3141 located inside the spring on the side close to the thrust spring 313, so as to prevent the grease in the housing 10 from flowing out through the check valve 3141 and prevent the medium outside the housing 10 from entering the housing 10.

[0026] The utility model improves the rear cover 314 of the existing automatic adjustment arm so that grease can be injected into the rear cover 314 under normal pressure in the sealed state. Specifically, the automatic adjustment arm is equipped with a worm gear assembly 21 and a sealing assembly 31 in the past, and the oil nozzle 40 is connected to the turbine of the worm gear assembly 21. During maintenance, since the passage from the oil nozzle 40 to the rear cover 314 is narrow and the rear cover 314 is in a relatively closed state, the grease often cannot reach the inner cavity of the rear cover 314 and the grease at the rear cover 314 easily flows out through the screw thread gap, which causes the grease in the inner cavity of the rear cover 314 to only flow out but not in. Based on this, the rear cover 314 is provided with a check valve 3141 located on the inner side of the spring on the side close to the thrust spring 313, which is used for the grease in the housing 10 to flow out through the check valve 3141 and to prevent the medium outside the housing 10 from entering the housing 10. It can be understood that the setting of the check valve 3141 allows the check valve 3141 to open when grease is injected through the oil nozzle 40, so that grease is injected into the rear cover 314 under normal pressure, replacing the old grease at the rear cover 314, so that the internal parts are in a lubricated state. Similarly, it avoids the problem that the instantaneous high pressure when the oil nozzle 40 is injected with oil easily breaks through the rubber sealing ring 311 of other parts of the adjustment arm, causing the internal parts to be exposed to external water vapor.

[0027] It should be noted that the check valve 3141 is an automatic valve used to prevent the medium from flowing back and only allow the medium to flow in one direction. That is, the medium can flow in one direction. After it is combined with the rear cover 314 of the automatic adjustment arm of the present application, the problem that the oil nozzle 40 cannot inject grease into the rear cover 314 under normal pressure to lubricate the internal parts and prevent the medium outside the housing 10 from entering the housing 10 under the internal sealing environment of the original automatic adjustment arm is solved.

[0028] In another embodiment, the check valve 3141 includes at least one of a lift check valve 3141 and a butterfly check valve 3141 .

[0029] Specifically, the check valve 3141 can be one of various structures such as a lift type, a swing type, a butterfly type, a diaphragm, a spring-embedded type, a swing type, a ball type, and a duckbill valve.

[0030] In another embodiment, the rear cover 314 is provided with a boss 3142 located on the inner side of the spring at the end surface close to the thrust spring 313 , and the boss 3142 is provided with a through hole for installing the check valve 3141 .

[0031] Specifically, the automatic adjustment arm is also provided with a boss 3142 in the past. The boss 3142 is provided in the past so that the end surface of the rear cover 314 facing away from the thrust spring 313 forms a groove at the boss 3142, which is convenient for tightening or loosening the rear cover 314 and the housing 10 with tools. The side of the rear cover 314 close to the thrust spring 313 is convex, so that an annular clamping groove for clamping the thrust spring 313 is formed between the boss 3142 and the rear cover 314. In the present application, a through hole is also provided at the position of the boss 3142 for installing the check valve 3141.

[0032] The utility model makes other improvements to the rear cover 314 of the existing automatic adjustment arm to increase the sealing performance of the automatic adjustment arm. In another embodiment, the rear cover 314 is connected to the housing 10 by threads, the housing 10 is provided with internal threads, the rear cover 314 has external threads, and a sealing layer (not shown in the figure) is provided between the external threads of the rear cover 314 and the internal threads of the housing 10; the sealing layer is at least one of a sealant and a sealing tape. By providing the sealing layer, the rear cover 314 of the automatic adjustment arm is completely sealed, free from external moisture erosion, and protects the internal grease from loss.

[0033] In another embodiment, the housing 10 is provided with a first cavity 20 and a second cavity 30 which are communicated through a through hole, the first cavity 20 is used to install the turbine worm 23 assembly, and the second cavity 30 is used to install the thrust washer 312, the thrust spring 313 and the rear cover 314 of the sealing assembly 31. The other end of the worm 23 of the turbine worm 23 assembly of the first cavity 20 is connected to the thrust washer 312 in the second cavity 30 through the through hole.

[0034] Specifically, the other end of the worm 23 of the worm gear assembly 21 in the automatic adjustment arm is connected to the thrust washer 312 , the thrust spring 313 and the rear cover 314 of the sealing assembly 31 through a through hole.

[0035] The sealing structure 100 of the automatic adjustment arm provided in the application realizes that the oil nozzle 40 injects grease into the inner cavity of the adjustment arm and the rear cover 314 through the check valve 3141 installed on the rear cover 314, replaces the old grease in the check valve of the rear cover 314, and prevents the medium outside the housing 10 from entering the housing 10, so that the internal parts are always in a good lubrication state, avoiding the previous situation where the rubber seal ring 311 is squeezed and deformed. In addition, a sealing layer is set at the rear cover 314 and the housing 10 to prevent external moisture erosion and protect the internal grease from loss, thereby increasing the sealing performance of the housing 10.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sealing structure of an automatic adjustment arm, comprising a housing, a worm gear assembly arranged in the housing, a sealing assembly connected to the worm of the worm gear assembly to form a seal, an oil nozzle of the worm gear assembly and the sealing assembly connected to the turbine of the worm gear assembly for injecting grease into the housing, the sealing assembly comprising a sealing ring mounted on the housing and sleeved on one end of the worm of the worm gear assembly, a thrust washer mounted on the housing and sequentially connected to the other end of the worm of the worm gear assembly, a thrust spring and a rear cover, the rear cover is connected to the housing by threads, and is characterized in that: The rear cover is provided with a check valve located inside the spring on one side close to the thrust spring, so as to prevent the grease in the housing from flowing out through the check valve and to prevent the medium outside the housing from entering the housing.

2. The sealing structure of the automatic adjustment arm according to claim 1, characterized in that: The rear cover is provided with a boss located inside the spring at the end surface close to the thrust spring, and the boss is provided with a through hole for installing a check valve.

3. The sealing structure of the automatic adjustment arm according to claim 1 or 2, characterized in that: The check valve includes at least one of a lift check valve and a butterfly check valve.

4. The sealing structure of the automatic adjustment arm according to claim 1, characterized in that: The rear cover is connected to the housing through threads, the housing is provided with internal threads, the rear cover is provided with external threads, and a sealing layer is provided between the external threads of the rear cover and the internal threads of the housing; The sealing layer is at least one of a sealant and a sealing tape.

5. The sealing structure of the automatic adjustment arm according to claim 1, characterized in that: The housing is provided with a first cavity and a second cavity which are communicated with each other through a through hole. The first cavity is used for installing a turbine worm assembly, and the second cavity is used for installing a thrust washer, a thrust spring and a rear cover of a sealing assembly.

6. The sealing structure of the automatic adjustment arm according to claim 4, characterized in that: The other end of the worm of the turbine worm assembly of the first cavity is connected to the thrust washer in the second cavity through the through hole.

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