Hydraulic cylinder for gear shifting

Abstract

The utility model relates to a hydraulic cylinder for gear shifting in the technical field of hydraulic cylinders. Two first oil pipes are installed at the upper end of the lower oil cylinder, second oil pipes are installed at the upper ends of the first oil pipes, nuts used for being matched with the external threads to limit the second oil pipes are installed in the middles of the second oil pipes, and annular leakage-proof pads used for preventing oil leakage are installed at the lower ends of the second oil pipes. When a nut is rotated, a thread in the nut is matched with an external thread to drive a limiting ring to move downwards, a second oil pipe drives an annular anti-leakage pad to move downwards, a connecting ring is inserted into a groove cavity of a third annular groove, and when the nut continues to be rotated, the second oil pipe is driven to be matched with an inner pipe to abut against the annular anti-leakage pad, so that oil leakage is avoided; and when the connection between the nut and the external thread is loosened, the spring pushes the two ends of a groove cavity of the first annular groove, so that the second oil pipe, the inner pipe and the annular anti-leakage pad are tightly propped against one another, and oil leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field especially is related to a gear shift hydraulic cylinder. BACKGROUND

[0002] Hydraulic cylinder is the hydraulic energy conversion mechanical energy, does linear reciprocating motion (or swing motion) hydraulic actuator, gear shift hydraulic cylinder is the important part in the automobile transmission system, mainly through the hydraulic pressure to realize the gear shift operation of vehicle. When the driver steps on the clutch pedal, the hydraulic gear shift hydraulic cylinder will receive the instruction from the transmission control unit, so that the hydraulic oil pressure in the hydraulic cylinder increases, thereby driving the gear shift mechanism to complete the gear shift operation. After the gear shift is completed, the hydraulic cylinder will automatically release the pressure, so that the transmission reenters the normal working state.

[0003] In some complex hydraulic control systems, multiple gear shift oil cylinders may be used to achieve different gear shift functions. For example, in the manual transmission gear shift system of some vehicles, two or more gear shift oil cylinders may be used to switch different gears.

[0004] However, the existing gear shift hydraulic cylinder has the problem of oil leakage at the oil pipe connection of the hydraulic cylinder after long-term use. UTILITY MODEL CONTENTS

[0005] To solve the problem of oil leakage at the oil pipe connection of the hydraulic cylinder in the background art, the utility model provides the following technical scheme:

[0006] A gear shift hydraulic cylinder, comprising a lower oil cylinder installed at the right end of a main shaft transmission case connecting plate;

[0007] The upper end of the lower oil cylinder is installed with two first oil pipes, and the upper end of the first oil pipe is installed with a second oil pipe.

[0008] The upper end of the first oil pipe is machined with external threads, and the upper end of the first oil pipe is installed with a sealing ring.

[0009] The middle part of the second oil pipe is installed with a nut for limiting the second oil pipe in cooperation with the external threads, and the lower end of the second oil pipe is installed with an annular leak-proof pad for preventing oil leakage.

[0010] Further, the first connecting shaft and the second connecting shaft are installed inside the main shaft transmission case connecting plate, the upper oil cylinder is installed at the right end of the main shaft transmission case connecting plate, the upper oil cylinder pressure cover is installed at the left end of the upper oil cylinder, and the lower oil cylinder pressure cover is installed at the left end of the lower oil cylinder.

[0011] Further, the lower oil cylinder shaft is installed inside the lower oil cylinder, and the cotter pin is installed at the lower end of the main shaft transmission case connecting plate.

[0012] Further, the inner cavity lower end of the first oil pipe is provided with an inner tube, and the upper end of the inner tube is provided with a third annular groove.

[0013] Further, the middle part of the second oil pipe is provided with a limiting ring for limiting the nut, and the bottom end of the second oil pipe is provided with a limiting groove.

[0014] Further, the bottom of the annular leak-proof pad is provided with a connecting ring, the upper end of the annular leak-proof pad is provided with a protrusion, the outer wall of the annular leak-proof pad is provided with a first annular groove, one side of the groove cavity of the first annular groove is provided with a second annular groove for facilitating deformation of the annular leak-proof pad, and the groove cavity of the first annular groove is provided with a spring.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] When the nut is rotated, the threads in the nut cooperate with the external threads to drive the limiting ring to move downward, so that the second oil pipe drives the annular leak-proof pad to move downward, and the connecting ring is inserted into the groove cavity of the third annular groove; when the nut is continuously rotated, the second oil pipe cooperates with the inner tube to tightly press the annular leak-proof pad, so as to avoid oil leakage, and the spring in the first annular groove is synchronously extruded; when the connection between the nut and the external threads is loosened, the spring pushes the two ends of the groove cavity of the first annular groove, so that the second oil pipe, the inner tube and the annular leak-proof pad are tightly pressed, thereby avoiding oil leakage. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other implementation drawings can be obtained according to the provided drawings without creating labor.

[0018] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the utility model, so they do not have technical significance, any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0019] Figure 1 It is a whole structure schematic view of the utility model;

[0020] Figure 2 It is an internal structure schematic view of the utility model;

[0021] Figure 3 It is the connection schematic view of the first oil pipe, the second oil pipe and the leakproof pad of the utility model;

[0022] Figure 4 It is the A place enlarged view of the utility model Figure 3 .

[0023] In the drawings, the component names represented by each reference sign are listed as follows:

[0024] 10- first connecting shaft, 20- second connecting shaft, 100- main shaft gearbox connecting plate, 110- catch pin, 120- upper oil cylinder, 121- upper oil cylinder gland, 130- lower oil cylinder, 131- lower oil cylinder gland, 140- lower oil cylinder shaft, 150- first oil pipe, 151- external thread, 152- inner tube, 153- sealing washer, 154- third annular groove, 160- second oil pipe, 161- limiting ring, 162- nut, 163- limiting groove, 170- annular leakproof pad, 171- connecting ring, 172- protruding block, 173- first annular groove, 174- second annular groove, 175- spring. DETAILED DESCRIPTION

[0025] The embodiments of the utility model are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosed content of the specification, obviously, the described examples are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] The terms such as "upper", "lower", "left", "right", "middle" and the like cited in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, and the change or adjustment of the relative relationship, without substantial change of the technical content, is also regarded as the scope of the utility model.

[0027] Please refer to Figures 1-4 The utility model provides a hydraulic cylinder for gear shifting, which comprises a lower oil cylinder 130 installed at the right end of a main shaft gearbox connecting plate 100.

[0028] The main shaft gearbox connecting plate 100 is internally provided with a first connecting shaft 10 and a second connecting shaft 20, and the first connecting shaft 10 and the second connecting shaft 20 extend to the left side of the main shaft gearbox connecting plate 100, so as to realize the switching of different gears. The right end of the main shaft gearbox connecting plate 100 is provided with an upper oil cylinder 120, the left end of the upper oil cylinder 120 is provided with an upper oil cylinder gland 121, and the left end of the lower oil cylinder 130 is provided with a lower oil cylinder gland 131. The inside of the lower oil cylinder 130 is internally provided with a lower oil cylinder shaft 140, and the middle part of the lower oil cylinder shaft 140 is provided with a piston. An oil cavity is formed in the inside of the lower oil cylinder 130, so that when the oil pushes the piston, the piston moves, and in turn drives the first connecting shaft 10 and the second connecting shaft 20 to move. The lower end of the main shaft gearbox connecting plate 100 is provided with a cotter pin 110.

[0029] The upper end of the lower oil cylinder 130 is provided with two first oil pipes 150, so as to facilitate the oil in and out, and push the piston in the oil cavity. The outer wall of the upper end of the first oil pipe 150 is processed with external threads 151, which can guide the nut 162. The inner cavity of the first oil pipe 150 is fixedly provided with an inner pipe 152 at the lower end. The upper end of the first oil pipe 150 is placed with a sealing ring 153 for placing oil leakage. The upper end of the inner pipe 152 is provided with a third annular groove 154.

[0030] The upper end of the first oil pipe 150 is provided with a second oil pipe 160, and the upper end of the second oil pipe 160 is connected with the oil pipe. The middle part of the second oil pipe 160 is sleeved with a nut 162 for limiting the second oil pipe 160. By rotating the nut 162, the threads on the inner wall of the nut 162 cooperate with the external threads 151 to drive the second oil pipe 160 to move towards the inner pipe 152.

[0031] The middle part of the second oil pipe 160 is fixedly provided with a limiting ring 161 for limiting the nut 162, and the nut 162 is located at the upper end of the limiting ring 161, so that when the nut 162 moves downward, the limiting ring 161 synchronously drives the second oil pipe 160 to move downward. The bottom end of the second oil pipe 160 is provided with a plurality of limiting grooves 163.

[0032] The lower end of the second oil pipe 160 is provided with an annular leakage-proof pad 170 for preventing oil leakage. The bottom of the annular leakage-proof pad 170 is provided with a fixed connecting ring 171, and the connecting ring 171 is installed in the groove cavity of the third annular groove 154. The upper end of the annular leakage-proof pad 170 is fixedly provided with a plurality of protrusions 172, and the protrusions 172 are installed in the groove cavities of the limiting grooves 163.

[0033] The outer wall of the annular leak-proof pad 170 is provided with a first annular groove 173 in the middle, and the groove cavity of the first annular groove 173 is provided with a second annular groove 174 on one side, which facilitates the deformation of the annular leak-proof pad 170.

[0034] When the screw cap 162 is rotated, the thread in the screw cap 162 cooperates with the external thread 151 to drive the limiting ring 161 to move downwards, so that the second oil pipe 160 drives the annular leak-proof pad 170 to move downwards, and the connecting ring 171 is inserted into the groove cavity of the third annular groove 154. When the screw cap 162 is continuously rotated, the second oil pipe 160 cooperates with the inner pipe 152 to tightly press the annular leak-proof pad 170, so as to avoid oil leakage. The spring 175 in the first annular groove 173 is synchronously extruded. When the connection between the screw cap 162 and the external thread 151 is loosened, the spring 175 pushes the both ends of the groove cavity of the first annular groove 173, so that the second oil pipe 160, the inner pipe 152 and the annular leak-proof pad 170 are tightly pressed, so as to avoid oil leakage.

[0035] Based on the above content and the drawings, those skilled in the art can understand and implement the present application. In addition, any non-creative modification of the present application made by those skilled in the art without creative labor still falls within the protection scope of the present application.

Claims

1. A shift hydraulic cylinder, comprising a lower oil cylinder (130) installed at the right end of a main shaft gearbox connecting plate (100), characterized in that: two first oil pipes (150) are installed at the upper end of the lower oil cylinder (130), and a second oil pipe (160) is installed at the upper end of the first oil pipe (150); an outer thread (151) is processed at the upper end of the first oil pipe (150), and a sealing ring (153) is installed at the upper end of the first oil pipe (150); a screw cap (162) for limiting the second oil pipe (160) by cooperating with the outer thread (151) is installed at the middle part of the second oil pipe (160), and an annular leak-proof pad (170) for preventing oil leakage is installed at the lower end of the second oil pipe (160).

2. The hydraulic shift cylinder of claim 1, wherein: A first connecting shaft (10) and a second connecting shaft (20) are installed inside the main shaft gearbox connecting plate (100), an upper oil cylinder (120) is installed at the right end of the main shaft gearbox connecting plate (100), an upper oil cylinder gland (121) is installed at the left end of the upper oil cylinder (120), and a lower oil cylinder gland (131) is installed at the left end of the lower oil cylinder (130).

3. The hydraulic shift cylinder of claim 1, wherein: A lower oil cylinder shaft (140) is installed inside the lower oil cylinder (130), and a bayonet (110) is installed at the lower end of the main shaft gearbox connecting plate (100).

4. The hydraulic shift cylinder of claim 1, wherein: An inner tube (152) is installed at the lower end of the inner cavity of the first oil pipe (150), and a third annular groove (154) is formed at the upper end of the inner tube (152).

5. The hydraulic shift cylinder of claim 1, wherein: A limiting ring (161) for limiting the screw cap (162) is installed at the middle part of the second oil pipe (160), and a limiting groove (163) is formed at the bottom end of the second oil pipe (160).

6. The hydraulic shift cylinder of claim 1, wherein: A connecting ring (171) is installed at the bottom of the annular leak-proof pad (170), a protrusion (172) is installed at the upper end of the annular leak-proof pad (170), a first annular groove (173) is formed on the outer wall of the annular leak-proof pad (170), a second annular groove (174) for facilitating deformation of the annular leak-proof pad (170) is formed on one side of the groove cavity of the first annular groove (173), and a spring (175) is installed in the groove cavity of the first annular groove (173).

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