Lightweight hydraulic driver

Abstract

The utility model provides a lightweight hydraulic driver which aims to solve the problems that a hydraulic driver in the prior art is long in overall dimension, not simple enough in oil way design and leakage is caused by friction between a sealing ring and the inner wall of a cylinder sleeve. The cylinder body is connected to the middle of the cylinder sleeve, the rack and the gear are meshed with each other, and the inclined holes are formed in the inner cavity walls of the two ends of the cylinder sleeve and are opposite to oil holes of the cylinder body. According to the hydraulic driver, in the design of an oil way, the overall length of the outline of the hydraulic driver is shortened in an inclined hole mode, the variability of the structure is improved, and the effect of reducing cost is achieved; the design that a sealing ring is installed on a rack is removed, the design that the groove is dug in the cylinder sleeve and the guide sleeve is additionally arranged to fix the sealing ring is adopted, the original piston type design is changed into the existing plunger type design concept, leakage caused by permanent friction between the sealing ring and the inner wall of the cylinder sleeve is avoided, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic actuator technology, and in particular to a lightweight hydraulic actuator. Background Technology

[0002] Hydraulic actuators are widely used in petroleum, chemical, power, energy, shipbuilding, metallurgy, building materials, papermaking, and boiler equipment. However, current hydraulic actuators on the market all exhibit various leakage issues, and their overall appearance gives a rather bulky first impression. Analysis and research have revealed that, besides factors related to processing and assembly, the rationality of the structural design is the main reason for leakage and the bulky appearance. Currently, most hydraulic actuators on the market are gear-rack and pinion piston reciprocating motion type, which is the primary cause of leakage. Therefore, a lightweight hydraulic actuator is needed to solve these problems.

[0003] The problems include: First, the design of traditional hydraulic actuators only ensures functional performance requirements without paying attention to the rational design of the external structure. For example, the oil circuit design inside the cylinder liner often adopts a long oil circuit, which makes the overall size of the hydraulic actuator longer.

[0004] Secondly, the rack's reciprocating motion inside the cylinder liner is generally achieved using a piston-type design. This places high demands on the material, structure, and temperature of the seals on the rack, as well as the smoothness of the cylinder liner's inner wall. Otherwise, there is a risk of wear and leakage. Utility Model Content

[0005] This application addresses the shortcomings of the prior art by providing a lightweight hydraulic actuator. In terms of oil circuit design, it adopts a slanted hole method to shorten the overall length and structural variability of the hydraulic actuator, thereby reducing costs. The design of installing the sealing ring on the rack is eliminated, and a guide sleeve is added by slotting inside the cylinder liner to fix the sealing ring. The original piston design is changed to a plunger design concept, which avoids leakage caused by permanent friction between the sealing ring and the inner wall of the cylinder liner and improves service life.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A lightweight hydraulic actuator includes a cylinder liner and a cylinder body connected to the middle of the cylinder liner. A rack is provided inside the cylinder liner along its axial direction, and a gear that meshes with the rack is provided inside the cylinder body. Inclined holes are provided between the inner walls of both ends of the cylinder liner and the oil holes of the cylinder body. A valve block communicating with the oil hole is provided at the other end of the cylinder body, and a ferrule connector is connected to the oil inlet end of the valve block.

[0008] Furthermore, an annular groove is provided at the junction of the cylinder liner inner diameter cavity and the cylinder body, a sealing ring is provided on the side of the annular groove adjacent to the cylinder liner, and a guide sleeve is provided on the side of the annular groove adjacent to the cylinder body.

[0009] Furthermore, the sealing ring is a Y-type sealing ring.

[0010] Furthermore, the cylinder liner has mechanical stops at both ends that abut against the rack and extend through the cylinder liner. The middle part of the mechanical stop is threaded onto the cylinder liner, and a locking nut is fixed at its end.

[0011] Furthermore, the cylinder body is also equipped with an indicator cover and an indicator shaft for observing the rotation angle of the gear.

[0012] The advantages of this utility model over the prior art are as follows:

[0013] 1) In terms of oil circuit design, this utility model adopts a slanted hole method for the oil circuit of the cylinder liners at both ends to shorten the overall length of the hydraulic drive and reduce the structural variability, thereby achieving the effect of cost reduction.

[0014] 2) The design of installing the sealing ring on the rack has been replaced with a design that adds a guide sleeve by cutting a groove inside the cylinder liner to fix the sealing ring. The original piston design has been changed to a plunger design concept, which avoids leakage caused by permanent friction between the sealing ring and the inner wall of the cylinder liner and improves service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] The components are: 1. Cylinder liner; 2. Cylinder block; 3. Rack; 4. Gear; 5. Inclined hole; 6. Oil hole; 7. Valve block; 8. Compression fitting; 9. Sealing ring; 10. Guide sleeve; 11. Mechanical limit; 12. Locking nut; 13. Indicator cover; 14. Indicator shaft. Detailed Implementation

[0017] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0018] This utility model provides a lightweight hydraulic actuator, which aims to solve the problems of the existing hydraulic actuators having a long external size, insufficiently simplified oil circuit design, and leakage caused by the friction between the sealing ring 9 and the inner wall of the cylinder liner 1.

[0019] like Figure 1As shown, this utility model includes a cylinder liner 1 and a cylinder body 2 connected to the middle of the cylinder liner 1. A rack 3 is provided inside the cylinder liner 1 along the axial direction. A gear 4 that meshes with the rack 3 is provided inside the cylinder body 2. An oblique hole 5 is provided between the inner walls of both ends of the cylinder liner 1 and the oil hole 6 of the cylinder body 2. A valve block 7 communicating with the oil hole 6 is provided at the other end of the cylinder body 2. A ferrule connector 8 is connected to the oil inlet end of the valve block 7.

[0020] In one embodiment of this utility model, an annular groove is provided at the junction of the inner diameter cavity of the cylinder liner 1 and the cylinder body 2. A sealing ring 9 is provided on the side of the annular groove adjacent to the cylinder liner 1, and a guide sleeve 10 is provided on the side of the annular groove adjacent to the cylinder body 2.

[0021] In one embodiment of this utility model, the sealing ring 9 is a Y-shaped sealing ring 9.

[0022] In one embodiment of this utility model, the two ends of the cylinder liner 1 are abutted against the rack 3 and are provided with mechanical limiters 11 that pass through the cylinder liner 1. The middle part of the mechanical limiter 11 is threaded to the cylinder liner 1 and the end of the mechanical limiter 11 is fixed with a locking nut 12.

[0023] In one embodiment of this utility model, the cylinder body 2 is also provided with an indicator cover 13 and an indicator shaft 14 for observing the rotation angle of the gear 4.

[0024] The specific structure and working principle of this utility model are as follows:

[0025] This utility model includes a cylinder liner 1 and a cylinder body 2 connected to the middle of the cylinder liner 1. Gears 4 and racks 3 mesh with each other inside the cylinder liner 1 and the cylinder body 2. The rack 3 can reciprocate by being pushed by hydraulic oil at both ends of the cylinder liner 1, thereby driving the gears 4 to rotate. The inner walls of both ends of the cylinder liner 1 are provided with oblique holes 5 between the oil holes 6 of the cylinder body 2 and the other end of the cylinder body 2 is provided with a valve block 7 communicating with its oil holes 6. The oil inlet end of the valve block 7 is connected to a ferrule connector 8.

[0026] The principle of shortening the overall outer dimension of the hydraulic actuator: Compared with the traditional design of a long horizontal oil circuit between two points, this utility model directly opens oblique holes 5 on the inner wall of the cylinder liners 1 at both ends to reach the oil holes 6 of the cylinder body 2. The design of oblique holes 5 not only ensures that the oil circuit has the function of basic pressure pushing, but also shortens the distance in the outer dimension of the hydraulic actuator, thereby achieving the technical effect of simplifying the shape design.

[0027] Compared to the traditional design of installing the sealing ring 9 on the rack 3, this new design uses an annular groove cut inside the cylinder liner 1 to add a guide sleeve 10 to fix the sealing ring 9. The original piston design has been changed to a plunger design concept, which avoids leakage caused by permanent friction between the sealing ring 9 and the inner wall of the cylinder liner 1 and improves the service life.

[0028] In use, external hydraulic oil enters through the ferrule connector 8, passes through the valve block 7, and then through the oil hole 6 of the cylinder body 2 and the inclined hole 5 of the cylinder liner 1, pushing the rack 3 and simultaneously driving the gear 4 to rotate in both directions. The rotation angle is adjusted to 90° by the mechanical limit 11 and locked by the locking nut 12. Similar to traditional hydraulic actuators, the 90° rotation angle is determined by the transparent indicator cover 13 and the indicator shaft 14. Among them, the Y-type sealing ring 9 is the seal of the rack 3, and the guide sleeve 10 is the seal guide of the rack 3.

[0029] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A lightweight hydraulic actuator, characterized in that: The cylinder includes a cylinder liner (1) and a cylinder body (2) connected to the middle of the cylinder liner (1). A rack (3) is provided inside the cylinder liner (1) along the axial direction. A gear (4) that meshes with the rack (3) is provided inside the cylinder body (2). An oblique hole (5) is provided between the inner walls of both ends of the cylinder liner (1) and the oil hole (6) of the cylinder body (2). A valve block (7) communicating with its oil hole (6) is provided at the other end of the cylinder body (2). A ferrule connector (8) is connected to the oil inlet end of the valve block (7).

2. The lightweight hydraulic actuator as described in claim 1, characterized in that: An annular groove is provided at the junction of the inner diameter cavity of the cylinder liner (1) and the cylinder body (2). A sealing ring (9) is provided on the side of the annular groove adjacent to the cylinder liner (1), and a guide sleeve (10) is provided on the side of the annular groove adjacent to the cylinder body (2).

3. A lightweight hydraulic actuator as described in claim 2, characterized in that: The sealing ring (9) is a Y-type sealing ring (9).

4. A lightweight hydraulic actuator as described in claim 1, characterized in that: The cylinder liner (1) has mechanical limiters (11) that pass through the cylinder liner (1) and abut against the rack (3) at both ends. The mechanical limiters (11) are threadedly connected to the cylinder liner (1) at the middle and have locking nuts (12) fixed at their ends.

5. A lightweight hydraulic actuator as described in claim 1, characterized in that: The cylinder (2) is also provided with an indicator cover (13) and an indicator shaft (14) for observing the rotation angle of the gear (4).

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