Oil cylinder

Abstract

The utility model discloses an oil cylinder which comprises a cylinder body provided with an installation cavity extending in the axial direction and an opening end. The guide sleeve is arranged at the opening end and embedded in the cavity wall of the mounting cavity, a through hole extending in the axial direction of the cylinder body is formed in the guide sleeve, and the guide sleeve comprises a first section and a second section which are different in thickness in the axial direction of the cylinder body; the piston shaft penetrates through the through hole and is arranged in a sliding mode relative to the hole wall of the through hole. According to the oil cylinder, the material consumption of the guide sleeve can be reduced, and the effect of reducing the cost is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic oil cylinder technical field especially relates to a kind of oil cylinder. BACKGROUND

[0002] Hydraulic oil cylinder is the execution element of a kind of energy conversion that linear motion mechanical energy is converted from hydraulic energy.Hydraulic oil cylinder generally includes cylinder body, the guide sleeve installed in cylinder body and the piston shaft that is slidably arranged with guide sleeve.

[0003] The outer diameter size of guide sleeve is set according to the inner diameter of cylinder body when guide sleeve is installed in cylinder body in prior art, and guide sleeve is generally copper material, which is expensive material.When copper sleeve is installed, the entire copper sleeve is installed with the inner wall of cylinder body in regular column shape, resulting in large amount of copper sleeve, thereby resulting in the increase of production cost. SUMMARY

[0004] To solve at least one problem existing in the prior art, according to one aspect of the utility model, an oil cylinder is provided, comprising:

[0005] The cylinder body has an installation cavity extending in the axial direction, and is provided with an open end;

[0006] The guide sleeve is provided at the open end and embedded on the cavity wall of the installation cavity, the guide sleeve is provided with a through hole extending in the axial direction of the cylinder body, and the guide sleeve comprises a first segment and a second segment with different thicknesses in the axial direction of the cylinder body;

[0007] The piston shaft is arranged through the through hole and slidably arranged relative to the hole wall of the through hole.

[0008] In some embodiments, the thickness of the first segment is greater than the thickness of the second segment, and the first segment is arranged close to the open end, and the length of the first segment is 1 / 12-1 / 8 of the total length of the guide sleeve in the axial direction of the cylinder body.

[0009] In some embodiments, the difference between the thickness d1 of the first segment and the thickness d2 of the second segment is in the range of 6-10mm.

[0010] In some embodiments, the guide sleeve and the inner wall of the cylinder body are in interference fit.

[0011] In some embodiments, the inner wall of the installation cavity is provided with a first installation groove and a second installation groove, the depth of the first installation groove is greater than the depth of the second installation groove, the first segment is arranged corresponding to the first installation groove, the second segment is arranged corresponding to the second installation groove, and the depth of the first installation groove is less than the thickness of the first segment, and the depth of the second installation groove is less than the thickness of the second segment.

[0012] In some embodiments, the difference Δ1 between the depth h1 of the first mounting groove and the thickness d1 of the first section and the difference Δ2 between the depth h2 of the second mounting groove and the thickness d2 of the second section ranges from 6 to 12 mm.

[0013] In some embodiments, the oil cylinder further comprises a mounting sleeve and a sealing sleeve, the mounting sleeve and the sealing sleeve are arranged at the open end, and the sealing sleeve is arranged between the mounting sleeve and the guide sleeve.

[0014] In some embodiments, the mounting sleeve and the cylinder body are connected by bolts.

[0015] The guide sleeve is used for sliding the piston shaft, when the guide sleeve and the cylinder body are installed, the guide sleeve is arranged in the form of the first section and the second section with different thicknesses, i.e. the first step surface is formed between the first section and the second section, after the entire guide sleeve is installed in the oil cylinder, the guide sleeve is stably embedded with the inner wall of the mounting cavity, i.e. the guide sleeve in the utility model is equivalent to cutting part of the material in the thickness direction of the corresponding part of the second section, the material of the part is omitted, so that the effect of saving material is achieved, the production cost is reduced, and the stability of installation is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic view of an oil cylinder according to an embodiment of the utility model;

[0017] Figure 2 FIG. 2 is an enlarged schematic view of I in FIG. 1; Figure 1

[0018] Figure 3 FIG. 5 is a structural schematic view of the guide sleeve in FIG. 1. Figure 1 The drawings: 100-oil cylinder, 10-cylinder body, 11-mounting cavity, 12-open end, 13-first mounting groove, 14-second mounting groove, 15-second step surface, 20-guide sleeve, 21-first section, 22-second section, 23-through hole, 25-first step surface, 30-piston shaft, 40-mounting sleeve, 50-sealing sleeve.

[0019] DETAILED DESCRIPTION In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0020] In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0021] ​In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] Please see Figures 1 to 3 The hydraulic cylinder 100 provided in this embodiment of the present utility model includes a cylinder body 10, a guide sleeve 20, and a piston shaft 30.

[0025] The cylinder body 10 has an axially extending mounting cavity 11 and an open end 12; the guide sleeve 20 is located at the open end 12 and is embedded in the cavity wall of the mounting cavity 11. The guide sleeve 20 has a through hole 23 extending axially along the cylinder body 10. Along the axial direction of the cylinder body 10, the guide sleeve 20 includes a first section 21 and a second section 22 with different thicknesses; the piston shaft 30 passes through the through hole 23 and is slidably disposed relative to the hole wall of the through hole 23.

[0026] The aforementioned hydraulic cylinder 100 has a guide sleeve 20 for sliding the piston shaft 30. When installing the guide sleeve 20 and the cylinder body 10, the guide sleeve 20 is configured with a first segment 21 and a second segment 22 of different thicknesses, forming a first step surface 25 between the first segment 21 and the second segment 22. After the entire guide sleeve 20 is installed in the hydraulic cylinder 100, the guide sleeve 20 achieves a stable fit with the inner wall of the mounting cavity 11. In other words, the guide sleeve 20 in this invention is equivalent to cutting off part of the material in the thickness direction corresponding to the second segment 22, omitting the material used in this part, thereby achieving the effect of saving materials, reducing production costs, and ensuring the stability of installation.

[0027] This is understandable; please refer to [link / reference]. Figure 2In order to match the installation structure of the guide sleeve 20, the inner wall of the mounting cavity 11 is provided with a first mounting groove 13 and a second mounting groove 14. The depth h1 of the first mounting groove 13 is greater than the depth h2 of the second mounting groove 14. The first mounting groove 13 is set corresponding to the first segment 21, and the second mounting groove 14 is set corresponding to the second segment 22. There is a second step surface 15 between the groove wall of the first mounting groove 13 and the groove wall of the second mounting groove 14. The second step surface 15 corresponds to the first step surface 25.

[0028] Specifically, when installing the first segment 21 and the second segment 22, the thicker first segment 21 is closer to the opening end 12, and the thinner second segment 22 is further away from the opening end 12, so as to be able to press tightly against the opening end 12 of the cylinder body 10.

[0029] Further, please refer to Figure 2 and Figure 3 When setting the first mounting groove 13 and the second mounting groove 14, the depth h1 of the first mounting groove 13 is less than the thickness d1 of the first segment 21, and the depth h2 of the second mounting groove 14 is less than the thickness d2 of the second segment 22. That is, after the installation of the guide sleeve 20 is completed, the inner wall of the guide sleeve 20 protrudes from the inner wall of the cylinder body 10, so as to achieve the guiding effect on the piston shaft 30 and avoid the piston shaft 30 and the inner wall of the cylinder body 10 from contacting and generating friction, which would affect the normal operation of the piston shaft 30.

[0030] Furthermore, the difference Δ1 between the depth h1 of the first mounting groove 13 and the thickness d1 of the first segment 21, and the difference Δ2 between the depth h2 of the second mounting groove 14 and the thickness d2 of the second segment 22, are within the range of 6-12mm. This ensures that the guide sleeve 20 does not protrude too much relative to the cylinder body 10, preventing the piston shaft 30 from being suspended too much relative to the cylinder body 10 when running within the guide sleeve 20 and the cylinder body 10. It also prevents the piston shaft 30 from colliding with the inner wall of the cylinder body 10 and causing friction when the range is too small. Furthermore, it avoids the situation where the guide sleeve 20 has little allowance for long-term wear by the piston shaft 30 when the range is too small, resulting in a short replacement cycle for the guide sleeve 20 and affecting its service life.

[0031] The values ​​of the difference Δ1 and the difference Δ2 can be set to 6mm, 7mm, 8mm, 9mm or 10mm, etc., and are not limited here.

[0032] Please see Figure 3In one embodiment of this utility model, in order to ensure installation strength while saving materials, the length L1 of the first segment 21 along the axial direction of the cylinder body 10 is 1 / 12 to 1 / 8 of the total length L of the guide sleeve 20. This ensures that the length of the thicker first segment 21 is not too small to guarantee the installation strength of the entire guide sleeve 20 in the oil cylinder 100, while also preventing excessive waste of materials.

[0033] The length L1 of the first segment 21 can be set to a ratio of 1 / 12, 1 / 11, 1 / 10, 1 / 9, or 1 / 8 of the length L of the guide sleeve 20, and is not limited here. For example, when the length L of the guide sleeve 20 is set to 40cm, the length L1 of the first segment 21 is 1 / 10 * 40 = 4cm, and the length L2 of the second segment 22 is 9 / 10 * 40 = 36cm.

[0034] Since the thickness of the first segment 21 is set to be greater than that of the second segment 22, the difference between the thickness d1 of the first segment 21 and the thickness d2 of the second segment 22 is 6-10mm. That is, the first segment 21 has a thickness d1 and the second segment 22 has a thickness d2, with the range of d1-d2 being 6-10mm. In this way, the thickness difference between the two is within this range, and the first step surface 25 between the two can have a certain height, ensuring the stability when installed on the hydraulic cylinder 100. At the same time, it also avoids the situation of wasting materials when the thickness difference is set too large.

[0035] In some embodiments, the thickness difference between the first segment 21 and the second segment 22 can be set to a value such as 6mm, 7mm, 8mm, 9mm or 10mm, and is not limited here.

[0036] In this embodiment, when the guide sleeve 20 is installed inside the hydraulic cylinder 100, it is interference-fitted with the cavity wall of the mounting cavity 11 of the hydraulic cylinder 100. Specifically, during installation, the initial raw material of the guide sleeve 20 is a hollow column. It is cold-fitted with liquid nitrogen. Since the raw material is in a contracted state at a low temperature, it can be easily placed into the cylinder 10. Then, the raw material is heated to cause it to expand. According to the principle of thermal expansion and contraction, it can be stably fitted into the inner wall of the cylinder 10. Since the raw material is hollow, a through hole 23 that matches the size of the piston shaft 30 can be machined by a machine tool. Thus, in this embodiment, by installing the copper sleeve inside the hydraulic cylinder 100 with an interference fit, gaps between the formed guide sleeve and the inner wall of the hydraulic cylinder 100 are avoided, improving the accuracy during subsequent use.

[0037] Compared to the method of molding a copper sleeve into a through hole 23 of a specific size and then fitting it with the cavity wall of the mounting cavity 11 with a clearance fit, which results in an installation gap between the guide sleeve 20 and the cylinder 100, and also a fitting gap between the piston shaft 30 and the guide sleeve 20, the cumulative effect of these two gaps, due to the horizontal placement of the cylinder 100 during use, causes the piston shaft 30 to generate a downward pressure due to gravity. This cumulative effect of the two gaps leads to low overall accuracy of the cylinder 100. Furthermore, this method avoids the deformation of the guide sleeve during installation caused by a thin-walled guide sleeve, which would affect subsequent accuracy. With an interference fit, the copper sleeve does not need to be pre-machined into a thin-walled shape; it can have a larger wall thickness and be machined to the specific inner diameter after installation in the cylinder body 10, reducing the molding difficulty of the guide sleeve 20.

[0038] Please see Figure 1 and Figure 2 In one embodiment of this utility model, in order to achieve stable installation of the guide sleeve 20, the cylinder 100 further includes an installation sleeve 40 and a sealing sleeve 50. The installation sleeve 40 and the sealing sleeve 50 are disposed at the open end 12, and the sealing sleeve 50 is disposed between the installation sleeve 40 and the guide sleeve 20. The installation sleeve 40 is used to connect with the cylinder body 10. In this way, by setting the sealing sleeve 50 and the installation sleeve 40, the sealing sleeve 50 can be compressed by the guide sleeve 20 and the installation sleeve 40 to ensure the tightness of the installation between the three, and at the same time, the installation sleeve 40 can be used to connect with other components.

[0039] Understandably, during installation, the mounting sleeve 40 is bolted to the cylinder body 10 to press the sealing sleeve 50, and the sealing sleeve 50 applies pressure to the guide sleeve 20 so that the guide sleeve 20 is pressed against the inner wall of the cylinder body 10.

[0040] The aforementioned hydraulic cylinder 100, by placing the thicker first section 21 near the opening end 12, facilitates the connection between the first section 21 and other components; by using an interference fit between the guide sleeve 20 and the cylinder body 10, a clearance fit between the guide sleeve 20 and the cylinder body 10 is avoided. After interference fit, there is only a clearance between the piston shaft 30 and the guide sleeve 20, which can ensure the accuracy of the piston shaft 30 during subsequent use; by setting the inner wall of the guide sleeve 20 to protrude from the inner wall of the cylinder body 10, friction between the piston shaft 30 and the inner wall of the cylinder body 10, which would affect the motion accuracy, can be avoided.

[0041] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A hydraulic cylinder, characterized in that, include: The cylinder block has an axially extending mounting cavity and an open end; A guide sleeve is provided at the opening end and embedded in the cavity wall of the mounting cavity. The guide sleeve has a through hole extending along the axial direction of the cylinder body. Along the axial direction of the cylinder body, the guide sleeve includes a first section and a second section with different thicknesses. The piston shaft passes through the through hole and is slidably disposed relative to the wall of the through hole.

2. The hydraulic cylinder according to claim 1, characterized in that, The thickness of the first segment is greater than that of the second segment, and the first segment is located close to the opening end. Along the axial direction of the cylinder, the length of the first segment is 1 / 12 to 1 / 8 of the total length of the guide sleeve.

3. The hydraulic cylinder according to claim 1 or 2, characterized in that, The difference between the thickness d1 of the first segment and the thickness d2 of the second segment is in the range of 6-10 mm.

4. The hydraulic cylinder according to claim 1 or 2, characterized in that, The guide sleeve and the inner wall of the cylinder are interference-fitted.

5. The hydraulic cylinder according to claim 1 or 2, characterized in that, The inner wall of the mounting cavity is provided with a first mounting groove and a second mounting groove. The depth of the first mounting groove is greater than the depth of the second mounting groove. The first segment corresponds to the first mounting groove, and the second segment corresponds to the second mounting groove. The depth of the first mounting groove is less than the thickness of the first segment, and the depth of the second mounting groove is less than the thickness of the second segment.

6. The hydraulic cylinder according to claim 5, characterized in that, The difference Δ1 between the depth h1 of the first mounting groove and the thickness d1 of the first segment, and the difference Δ2 between the depth h2 of the second mounting groove and the thickness d2 of the second segment, are in the range of 6-12 mm.

7. The hydraulic cylinder according to claim 2, characterized in that, The cylinder further includes an mounting sleeve and a sealing sleeve, which are located at the open end, and the sealing sleeve is located between the mounting sleeve and the guide sleeve.

8. The hydraulic cylinder according to claim 7, characterized in that, The mounting sleeve and the cylinder body are connected by bolts.

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