Cab overturning oil cylinder with novel sealing sleeve

Abstract

The cab overturning oil cylinder comprises a base and a cylinder barrel which is fixedly connected with the base and connected with an oil pipe, the end, away from the base, of the cylinder barrel is connected with the sealing sleeve and an outer sealing piece, the inner wall of the cylinder barrel is connected with a piston in a sliding mode, the piston is fixedly connected with a piston rod, and the piston rod penetrates through the sealing sleeve and extends to the outer side of the cylinder barrel. A second groove and a positioning hole located in the radial direction of the second groove are formed in the outer side of the sealing sleeve, a first groove matched with the second groove and a notch communicated with the first groove are formed in the inner wall of the cylinder barrel, a channel formed by the first groove and the second groove is connected with a steel wire check ring, and the cylinder barrel is provided with a glue injection through hole communicated to the first groove. Therefore, the steel cable baffle ring is inserted into a channel formed by the first groove and the second groove and then is fixed through glue injection. The sealing sleeve can be effectively and completely fixed, so that the sealing structure of the sealing sleeve can be kept in a static sealing state, the sealing reliability of the oil cylinder can be ensured, and the service life of the oil cylinder is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of tipping cylinders, in particular to a cab tipping cylinder with a new type of seal. Background Art

[0002] The front structure of existing commercial trucks is generally a flat-head type, that is, the cab is arranged above the engine. If the engine compartment needs to be maintained and repaired, the cab needs to be lifted and tipped, so a cab tipping cylinder (hereinafter referred to as the cylinder) is required. The cylinder is mainly used to realize the tipping, lifting and falling back of the cab. The main structure of the cylinder includes a piston rod, a cylinder barrel, a oil pipe, a base, a seal and a piston, etc. At the front end of the cylinder barrel, a seal is required to seal and position the piston rod to prevent oil leakage and guide the direction of the piston rod at the same time. For the fixation of the seal, generally, a hole-type wire snap ring and a step are arranged in the cylinder barrel to realize the two-end limit fixation of the seal.

[0003] However, the existing fixation method of the seal is not easy to assemble and disassemble. And due to the assembly requirements, an assembly allowance space needs to be reserved, so that the seal is not completely fixed in the cylinder barrel. The seal still has a little movement space, making the original sealing method of the seal change from static seal to dynamic seal. The seal will move slightly in the axial direction, resulting in premature and excessive friction between the seal ring on the outer periphery of the seal and the cylinder barrel, causing wear of the seal ring, resulting in faults such as pressure leakage and oil leakage of the cylinder, and affecting the service life of the cylinder. Summary of the Utility Model

[0004] In order to solve the technical problems existing in the prior art that the seal is not completely fixed in the cylinder barrel, the seal will move slightly in the axial direction, the seal ring on the outer periphery of the seal will prematurely and excessively rub against the cylinder barrel, resulting in wear of the seal ring, resulting in faults such as pressure leakage and oil leakage of the cylinder, and affecting the service life of the cylinder, the utility model provides the following technical solutions.

[0005] A cab tipping cylinder with a new type of seal of the utility model includes a base and a cylinder barrel connected with an oil pipe fixedly connected to the base. One end of the cylinder barrel far away from the base is connected with a seal and an outer seal. A piston is slidably connected to the inner wall of the cylinder barrel. The piston is fixedly connected with a piston rod. The piston rod penetrates through the seal and extends to the outside of the cylinder barrel. A second groove and a positioning hole in the radial direction of the second groove are arranged on the outer side of the seal. A first groove matching with the second groove and a notch communicated with the first groove are arranged on the inner wall of the cylinder barrel. A wire snap ring is connected to the channel formed by the first groove and the second groove. The cylinder barrel is provided with a glue injection through hole communicated with the first groove, so as to inject glue for fixation after the wire snap ring is inserted into the channel formed by the first groove and the second groove.

[0006] As a further technical solution, the glue injection through hole is arranged on one side of the cylinder wall relative to the notch.

[0007] As a further technical solution, claw hook ends inserted into the positioning holes and guiding inclined surface ends far from the claw hook ends are respectively arranged at both ends of the wire retaining ring.

[0008] As a further technical solution, an auxiliary hole is arranged at one end of the sleeve close to the outer seal.

[0009] The beneficial effects of the present utility model are as follows: the present utility model enables the wire retaining ring to be inserted into the channel formed by the first groove and the second groove from the notch, and the glue injection through hole can inject metal glue into the channel formed by the first groove and the second groove, so as to effectively and completely fix the sleeve, prevent the sleeve from undergoing slight movement in the cylinder, keep the sealing structure of the sleeve in a static sealing state, prevent the sealing ring on the outer periphery of the sleeve from wearing, ensure the sealing reliability of the oil cylinder, extend the service life of the oil cylinder, and facilitate the assembly and disassembly of the sleeve. Description of the Drawings

[0010] Figure 1 is the internal sectional plane structure schematic diagram of the present utility model;

[0011] Figure 2 is the external plane structure schematic diagram of the present utility model;

[0012] Figure 3 is the connection schematic diagram of the cylinder and the sleeve of the present utility model;

[0013] Figure 4 is the cylinder structure schematic diagram of the present utility model;

[0014] In the figure: 1 - base; 2 - piston; 3 - oil pipe; 4 - cylinder; 401 - notch; 402 - first groove; 403 - glue injection through hole; 5 - sleeve; 501 - positioning hole; 502 - second groove; 503 - auxiliary hole; 6 - wire retaining ring; 601 - claw hook end; 602 - guiding inclined surface end; 7 - piston rod; 8 - outer seal. Detailed Embodiments

[0015] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0016] In the description of the present utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0017] As Figure 1 and Figure 2 shown, a cab tilting oil cylinder of the present utility model adopting a new type of envelope includes a base 1 and a cylinder barrel 4 fixedly connected to the base 1. The cylinder barrel 4 is connected with an oil pipe 3, and the oil pipe 3 is connected to an external oil pump. The oil pump is the power source of the hydraulic cylinder, and the output pressure of the oil pump drives the cylinder to act to complete the lifting and falling of the cab. One end of the cylinder barrel 4 away from the base 1 is connected with an envelope 5 and an outer seal 8. The envelope 5 is used for guiding and positioning the piston rod 7, and the outer seal 8 is used for dust prevention and sealing fixation. A piston 2 is slidably connected to the inner wall of the cylinder barrel 4. The piston 2 is fixedly connected with a piston rod 7, and the piston rod 7 extends through the envelope 5 to the outside of the cylinder barrel 4.

[0018] As Figure 3 and Figure 4 shown, in a preferred embodiment, a second groove 502 is provided on the outer side of the envelope 5. The second groove 502 is arranged around the outer periphery of the envelope 5. The second groove 502 is provided with a positioning hole 501 in the radial direction. The positioning hole 501 is a blind hole, and its hole opening is in the second groove 502. A first groove 402 matching the second groove 502 is provided on the inner wall of the cylinder barrel 4. The first groove 402 is arranged around the inner wall of the cylinder barrel 4. The first groove 402 is communicated with a notch 401, and the notch 401 penetrates the side wall of the cylinder barrel 4. After the envelope 5 is inserted into the cylinder barrel 4, the first groove 402 and the second groove 502 can form a channel, and a wire snap ring 6 is connected to this channel. The advantage of the wire snap ring 6 is that its elastic ability and strength are very high, it can withstand the requirements of high torque, high thrust and high vibration, and has a long service life and high reliability. The wire snap ring 6 can be inserted into the channel formed by the first groove 402 and the second groove 502 from the notch 401. In turn, the wire snap ring 6 connects and fixes the envelope 5 and the cylinder barrel 4, and there is almost no micro-movement between the envelope 5 and the cylinder barrel 4, reducing the wear of the outer peripheral seal ring of the envelope 5.

[0019] Both ends of the wire retaining ring 6 are respectively provided with a claw hook end 601 inserted into the positioning hole 501 and a guiding inclined surface end 602 far away from the claw hook end 601. One end of the sleeve 5 close to the outer seal 8 is provided with an auxiliary hole 503. During assembly, the sleeve 5 is inserted into the cylinder barrel 4, the positioning hole 501 of the sleeve 5 is aligned with the notch 401 of the cylinder barrel 4, and then the claw hook end 601 of the wire retaining ring 6 is snapped into the positioning hole 501. Then, a fixture is inserted into the auxiliary hole 503 to rotate the sleeve 5, and the wire retaining ring 6 is screwed into the channel formed by the first groove 402 and the second groove 502 to realize the fixed limit of the sleeve 5. During disassembly, the fixture is used to rotate the sleeve 5 in the reverse direction through the auxiliary hole 503, and the guiding inclined surface end 602 of the wire retaining ring 6 will exit from the notch 401 of the cylinder barrel 4, and then the sleeve 5 can be taken out.

[0020] In a preferred embodiment, after the wire retaining ring 6 is screwed into the channel formed by the first groove 402 and the second groove 502, there will be some gaps in the channel. Therefore, the cylinder barrel 4 is provided with a glue injection through hole 403 communicating with the first groove 402 to facilitate glue injection and fixation after the wire retaining ring 6 is inserted into the channel formed by the first groove 402 and the second groove 502. The glue injection through hole 403 is arranged on one side of the side wall of the cylinder barrel 4 relative to the notch 401. During assembly, first, the wire retaining ring 6 is screwed into the channel formed by the first groove 402 and the second groove 502, and then the notch 401 is located at the topmost position. At this time, the glue injection through hole 403 is at the bottommost position. Metal glue is injected from the glue injection through hole 403. The metal glue can make the connection part firm, with high hardness and good sealing performance, and is not easy to deform. The metal glue injected from the glue injection through hole 403 can uniformly fill the gaps in the channel and overflow from the notch 401 after being filled. At this time, stop injecting glue. After the metal glue is cured, the metal glue cooperates with the wire retaining ring 6 to completely fix and limit the sleeve 5, ensuring the sealing performance of the sleeve. During disassembly, only high temperature needs to be applied to the channel to melt the metal glue, then the wire retaining ring 6 is taken out, and then the sleeve 5 is taken out.

[0021] The specific embodiments and examples of the present invention are described in detail above in conjunction with the drawings. However, the present invention is not limited to the above embodiments and examples. Within the knowledge scope of those skilled in the art, various changes or equivalent replacements can be made without departing from the concept of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A cab tilting oil cylinder using a new type of sleeve, comprising a base (1) and a cylinder barrel (4) fixedly connected to the base (1) and connected to an oil pipe (3), the end of the cylinder barrel (4) away from the base (1) is connected to a sleeve (5) and an outer seal (8), the inner wall of the cylinder barrel (4) is slidably connected to a piston (2), the piston (2) is fixedly connected to a piston rod (7), the piston rod (7) passes through the sleeve (5) and extends to the outside of the cylinder barrel (4), characterized in that: The outer side of the sleeve (5) is provided with a second groove (502) and a positioning hole (501) located radially of the second groove (502); the inner wall of the cylinder (4) is provided with a first groove (402) matching the second groove (502) and a notch (401) communicating with the first groove (402); the channel formed by the first groove (402) and the second groove (502) is connected with a wire retaining ring (6); the cylinder (4) is provided with a glue injection through hole (403) communicating with the first groove (402), so that the wire retaining ring (6) can be inserted into the channel formed by the first groove (402) and the second groove (502) and then fixed by glue injection.

2. The cab tilting cylinder using a novel cover according to claim 1 is characterized in that: The glue injection through hole (403) is arranged on a side of the side wall of the cylinder barrel (4) opposite to the notch (401).

3. The cab tilting cylinder using a novel cover according to claim 1 is characterized in that: The wire retaining ring (6) is provided at both ends with a claw hook end (601) inserted into the positioning hole (501) and a guiding inclined surface end (602) away from the claw hook end (601).

4. The cab tilting cylinder using a novel cover according to claim 1 is characterized in that: An auxiliary hole (503) is provided at one end of the envelope (5) close to the outer sealing member (8).

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