Oil-free pneumatic rod

By setting a sliding sleeve outside the gas spring of the air pressure rod and setting a sliding cylinder inside the outer tube, the problems of poor wear resistance of the powder spray layer and unstable expansion and contraction of the gas spring in the prior art are solved, and the smooth expansion and contraction of the gas spring and effective protection of the powder spray layer are achieved.

CN222615892UActive Publication Date: 2025-03-14马以广
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Patent Information

Application Number
CN202421537388.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-01
Publication Date
2025-03-14
Estimated Expiration
2034-07-01

AI Technical Summary

Technical Problem

The powder spray layer of the existing air pressure rod has poor wear resistance and is easily worn by the chrysanthemum core. The thickness tolerance of the powder spray layer is large, which affects the smooth expansion and contraction of the gas spring.

Method used

By providing a sliding sleeve outside the gas spring and a sliding cylinder inside the outer tube, the sliding sleeve of the gas spring slides in the sliding cylinder to provide sliding support to prevent the chrysanthemum core from directly wearing the powder spray layer outside the gas spring.

Benefits of technology

It effectively reduces the wear of the powder spray layer, ensures the smooth expansion and contraction of the gas spring, and avoids the impact of the thickness tolerance of the powder spray layer on the expansion and contraction of the gas spring.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an oil-free gas pressure rod which comprises an outer pipe, a gas spring and a chrysanthemum core, a sliding cylinder is coaxially and fixedly connected in the outer pipe, a sliding sleeve is coaxially and fixedly connected outside the gas spring, the outer contour size of the sliding sleeve is matched with the inner contour size of the sliding cylinder, and a piston rod on the gas spring is fixedly connected with one end of the outer pipe. A powder spraying layer is arranged outside the air spring, and the chrysanthemum core is coaxially and fixedly connected to the other end of the outer pipe and located between the outer pipe and the sliding cylinder. According to the utility model, the sliding cylinder provides sliding support for the sliding sleeve, so that the outer pipe indirectly provides sliding support for the gas spring, and the chrysanthemum core does not provide sliding support for the gas spring when moving relative to the gas spring, so that the chrysanthemum core does not abrade a powder spraying layer outside the gas spring; and gaps exist between the gas spring and the outer pipe and between the gas spring and the chrysanthemum core, so that the thickness tolerance of the powder spraying layer does not influence the stretching of the gas spring, and the stable stretching of the gas spring is facilitated.
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Description

Technical Field

[0001] The utility model belongs to the technical field of gas pressure rods, in particular to an oil-free gas pressure rod. Background Art

[0002] At present, the pneumatic rod generally includes an outer tube, a chrysanthemum core and a gas spring, and the chrysanthemum core is fixedly connected to one end of the outer tube, and one end of the gas spring is slidably connected to the chrysanthemum core, so as to provide sliding support for one end of the gas spring through the inside of the chrysanthemum core. However, the outside of the gas spring of some pneumatic rod products is formed by powder spraying to form a powder spray layer, and the wear resistance of the powder spray layer is poor, and the thickness tolerance of the powder spray layer is large, which makes the powder spray layer more easily worn by the chrysanthemum core and is not conducive to the smooth expansion and contraction of the gas spring. Utility Model Content

[0003] In order to overcome the defects of the prior art, the utility model provides an oil-free gas pressure rod, which can reduce the wear of the powder spraying layer outside the gas spring and is conducive to the stable expansion and contraction of the gas spring.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] An oil-free gas pressure rod, comprising:

[0006] An outer tube, wherein a sliding cylinder is coaxially fixedly connected to the inner part of the outer tube;

[0007] Gas spring, a sliding sleeve is coaxially fixedly connected to the outside of the gas spring, the outer contour size of the sliding sleeve matches the inner contour size of the sliding cylinder, the piston rod on the gas spring is fixedly connected to one end of the outer tube, and a powder spray layer is arranged on the outside of the gas spring;

[0008] A chrysanthemum core is coaxially fixedly connected to the other end of the outer tube and is located between the outer tube and the sliding cylinder.

[0009] The beneficial effects of adopting the above technical solution are as follows: the gas spring can be slidably connected to the sliding cylinder coaxially arranged inside the outer tube by relying on the sliding sleeve coaxially arranged outside the gas spring, so as to realize the relative sliding of the unfixed end of the gas spring and the outer tube; in this process, the sliding cylinder provides sliding support for the sliding sleeve, so that the outer tube indirectly provides sliding support for the gas spring, and the chrysanthemum core that has relative motion with the gas spring no longer provides sliding support for the gas spring, so the chrysanthemum core will no longer wear the powder coating layer on the outside of the gas spring; and there is a gap between the gas spring and the outer tube and the chrysanthemum core, so the thickness tolerance of the powder coating layer will not affect the expansion and contraction of the gas spring, which is conducive to the smooth expansion and contraction of the gas spring.

[0010] In one embodiment, a first hole is provided at one end of the outer tube, and the inner contour size of the first hole matches the outer contour size of one end of the chrysanthemum core, and the inner contour size of one end of the chrysanthemum core matches the outer contour size of the sliding cylinder.

[0011] The beneficial effect of adopting the above technical solution is that the chrysanthemum core can be just stuck in the gap between the outer tube and the sliding cylinder by such arrangement.

[0012] In one embodiment, the inner contour dimension of the other end of the chrysanthemum core is smaller than the outer contour dimension of the sliding cylinder and larger than the outer contour dimension of the gas spring.

[0013] The beneficial effect of adopting the above technical solution is that such an arrangement is conducive to axially limiting the chrysanthemum core through the other end of the chrysanthemum core.

[0014] In one embodiment, the other end of the outer tube is provided with a second hole for passing the piston rod of the gas spring, and the end of the piston rod of the gas spring exposed outside the outer tube is clamped with the outer tube through a clamping spring.

[0015] The beneficial effect of adopting the above technical solution is that the piston rod on the gas spring can be clamped on the outer tube by the clamping spring after passing through the second hole.

[0016] In one embodiment, a third hole is provided at one end of the second hole away from the first hole, and the clamping spring is clamped in the third hole.

[0017] The beneficial effect of adopting the above solution is that the third hole body provides installation and clamping space for the clamping spring.

[0018] In one embodiment, a clamping portion is provided at one end of the piston rod on the gas spring, and the clamping spring is clamped with the clamping portion.

[0019] The beneficial effect of adopting the above technical solution is that the piston rod on the gas spring can be clamped with the clamping spring through the clamping part.

[0020] In one embodiment, a limiting portion is provided at one end of the clamping portion, and a plane bearing and a flat washer are sleeved on the limiting portion. The plane bearing and the flat washer are respectively located at both ends of the second hole body, and the flat washer is located between the retaining spring and the second hole body. The sum of the heights of the plane bearing, the second hole body and the flat washer matches the height of the limiting portion.

[0021] The beneficial effect of adopting the above technical solution is: after the plane bearing is installed on the limiting part and passes through the second hole body, a flat washer is installed on the limiting part so that the clamping part is just exposed on the flat washer, which is conducive to fixing one end of the piston rod on the gas spring after the retaining ring is installed.

[0022] In one embodiment, a shock-absorbing pad is sleeved on the piston rod of the gas spring, and the shock-absorbing pad is located at an end of the limiting portion away from the clamping portion.

[0023] The beneficial effect of adopting the above technical solution is that the shock-absorbing pad can play a buffering effect when the gas spring contracts.

[0024] In one embodiment, a fourth hole body is coaxially arranged between the first hole body and the second hole body, and the inner contour size of the fourth hole body matches the outer contour size of the sliding cylinder.

[0025] The beneficial effect of adopting the above technical solution is: such an arrangement makes it convenient to install the sliding cylinder into the outer tube along the fourth hole body, and at the same time, the fourth hole body provides support for the outer tube.

[0026] In one embodiment, the sum of the depths of the first hole and the fourth hole matches the length of the sliding cylinder.

[0027] The beneficial effects of the utility model are:

[0028] The gas spring can be slidably connected to the sliding cylinder coaxially arranged inside the outer tube by relying on the sliding sleeve coaxially arranged outside the gas spring to realize the relative sliding of the unfixed end of the gas spring and the outer tube; in this process, the sliding cylinder provides sliding support for the sliding sleeve, so that the outer tube indirectly provides sliding support for the gas spring, and the chrysanthemum core that has relative motion with the gas spring no longer provides sliding support for the gas spring, so the chrysanthemum core will no longer wear the powder coating layer on the outside of the gas spring; and there are gaps between the gas spring and the outer tube and the chrysanthemum core, so the thickness tolerance of the powder coating layer will not affect the expansion and contraction of the gas spring, which is conducive to the smooth expansion and contraction of the gas spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0030] in:

[0031] Figure 1 A schematic structural diagram of an embodiment of the utility model is shown;

[0032] Figure 2 It shows the schematic diagram of the connection between the outer tube and the sliding cylinder in the utility model;

[0033] Figure 3 The schematic diagram showing the connection between the gas spring and the sliding sleeve in the utility model is shown;

[0034] Figure 4 The schematic diagram of the structure of the chrysanthemum core in the utility model is shown;

[0035] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0036] Reference numerals:

[0037] 1-gas spring, 101-clamping part, 102-limiting part, 2-chrysanthemum core, 3-outer tube, 301-first hole body, 302-second hole body, 303-third hole body, 304-fourth hole body, 4-sliding cylinder, 5-sliding sleeve, 6-shock-absorbing pad, 7-circlip, 8-flat pad, 9-plane bearing. DETAILED DESCRIPTION

[0038] The utility model will be further described below in conjunction with the accompanying drawings.

[0039] The utility model provides an oil-free gas pressure rod, such as Figure 1-4 As shown, including:

[0040] An outer tube 3, a sliding cylinder 4 is coaxially fixedly connected inside the outer tube 3;

[0041] Gas spring 1, a sliding sleeve 5 is coaxially fixedly connected to the outside of the gas spring 1, the outer contour size of the sliding sleeve 5 matches the inner contour size of the sliding cylinder 4, the piston rod on the gas spring 1 is fixedly connected to one end of the outer tube 3, and a powder spraying layer is arranged on the outside of the gas spring 1;

[0042] The chrysanthemum core 2 is coaxially fixedly connected to the other end of the outer tube 3 , and the chrysanthemum core 2 is located between the outer tube 3 and the sliding cylinder 4 .

[0043] It can be understood that the gas spring 1 can be slidably connected to the sliding cylinder 4 coaxially arranged inside the outer tube 3 by relying on the sliding sleeve 5 coaxially arranged outside it, so as to realize the relative sliding of the unfixed end of the gas spring 1 and the outer tube 3; in this process, the sliding cylinder 4 provides sliding support for the sliding sleeve 5, so that the outer tube 3 indirectly provides sliding support for the gas spring 1, and the chrysanthemum core 2 that has relative movement with the gas spring 1 no longer provides sliding support for the gas spring 1, so the chrysanthemum core 2 will no longer wear the powder coating layer on the outside of the gas spring 1; and there are gaps between the gas spring 1 and the outer tube 3 and the chrysanthemum core 2, so the thickness tolerance of the powder coating layer will not affect the extension and retraction of the gas spring 1, which is conducive to the smooth extension and retraction of the gas spring 1.

[0044] It should be noted that the outer side of the sliding sleeve 5 can be processed by a lathe.

[0045] In one embodiment, Figure 1 and Figure 2 As shown, a first hole body 301 is provided at one end of the outer tube 3 , and the inner contour size of the first hole body 301 matches the outer contour size of one end of the chrysanthemum core 2 , and the inner contour size of one end of the chrysanthemum core 2 matches the outer contour size of the sliding cylinder 4 .

[0046] It is understandable that such an arrangement enables the chrysanthemum core 2 to be just stuck in the gap between the outer tube 3 and the sliding cylinder 4 .

[0047] In one embodiment, the inner contour dimension of the other end of the chrysanthemum core 2 is smaller than the outer contour dimension of the sliding cylinder 4 and larger than the outer contour dimension of the gas spring 1 .

[0048] It can be understood that such a configuration is conducive to axially limiting the chrysanthemum core 2 through the other end of the chrysanthemum core 2.

[0049] In one embodiment, the other end of the outer tube 3 is provided with a second hole 302 for passing the piston rod on the gas spring 1, and the end of the piston rod on the gas spring 1 exposed from the outer tube 3 is clamped to the outer tube 3 by the retaining spring 7, that is, the piston rod on the gas spring 1 can be clamped to the outer tube 3 by the retaining spring 7 after passing through the second hole 302.

[0050] In one embodiment, a third hole 303 is provided at one end of the second hole 302 away from the first hole 301 , and the retaining spring 7 is clamped in the third hole 303 ; wherein the third hole 303 provides an installation and clamping space for the retaining spring 7 .

[0051] In one embodiment, Figure 1 and Figure 3 As shown, a clamping portion 101 is provided at one end of the piston rod of the gas spring 1 , and the clamping spring 7 is clamped with the clamping portion 101 , that is, the piston rod of the gas spring 1 can be clamped with the clamping spring 7 through the clamping portion 101 .

[0052] In one embodiment, a limiting portion 102 is provided at one end of the clamping portion 101, and a plane bearing 9 and a flat washer 8 are sleeved on the limiting portion 102. The plane bearing 9 and the flat washer 8 are respectively located at the two ends of the second hole body 302, and the flat washer 8 is located between the retaining spring 7 and the second hole body 302. The sum of the heights of the plane bearing 9, the second hole body 302 and the flat washer 8 matches the height of the limiting portion 102.

[0053] It can be understood that after the plane bearing 9 is installed on the limiting portion 102 and passes through the second hole body 302, the flat washer 8 is installed on the limiting portion 102 so that the clamping portion 101 is just exposed on the flat washer 8. This is conducive to fixing one end of the piston rod on the gas spring 1 after the retaining ring 7 is installed.

[0054] In one embodiment, a shock-absorbing pad 6 is sleeved on the piston rod of the gas spring 1 , and the shock-absorbing pad 6 is located at an end of the limiting portion 102 away from the clamping portion 101 .

[0055] It can be understood that the shock absorbing pad 6 can play a buffering effect when the gas spring 1 contracts.

[0056] In one embodiment, a fourth hole 304 is coaxially disposed between the first hole 301 and the second hole 302 , and the inner contour size of the fourth hole 304 matches the outer contour size of the sliding cylinder 4 .

[0057] It is understandable that such a configuration facilitates the installation of the sliding cylinder 4 into the outer tube 3 along the fourth hole 304 , and at the same time, the fourth hole 304 provides support for the outer tube 3 .

[0058] In one embodiment, the sum of the depths of the first hole 301 and the fourth hole 304 matches the length of the sliding cylinder 4 .

[0059] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0060] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. An oil-free gas pressure rod, characterized in that: include: An outer tube (3), wherein a sliding cylinder (4) is coaxially fixedly connected inside the outer tube (3); A gas spring (1), wherein a sliding sleeve (5) is coaxially fixedly connected to the outside of the gas spring (1), the outer contour size of the sliding sleeve (5) matches the inner contour size of the sliding cylinder (4), the piston rod on the gas spring (1) is fixedly connected to one end of the outer tube (3), and a powder spraying layer is arranged on the outside of the gas spring (1); A chrysanthemum core (2), the chrysanthemum core (2) is coaxially fixedly connected to the other end of the outer tube (3), and the chrysanthemum core (2) is located between the outer tube (3) and the sliding cylinder (4).

2. The oil-free gas pressure rod according to claim 1, characterized in that: A first hole body (301) is provided at one end of the outer tube (3), and the inner contour size of the first hole body (301) matches the outer contour size of one end of the chrysanthemum core (2), and the inner contour size of one end of the chrysanthemum core (2) matches the outer contour size of the sliding cylinder (4).

3. The oil-free gas pressure rod according to claim 2, characterized in that: The inner contour dimension of the other end of the chrysanthemum core (2) is smaller than the outer contour dimension of the sliding cylinder (4) and larger than the outer contour dimension of the gas spring (1).

4. The oil-free gas pressure rod according to claim 2, characterized in that: The other end of the outer tube (3) is provided with a second hole (302) for passing the piston rod on the gas spring (1), and the end of the piston rod on the gas spring (1) exposed outside the outer tube (3) is clamped to the outer tube (3) via a clamping spring (7).

5. The oil-free gas pressure rod according to claim 4, characterized in that: A third hole (303) is provided at one end of the second hole (302) away from the first hole (301), and the clamping spring (7) is clamped in the third hole (303).

6. The oil-free gas pressure rod according to claim 4 or 5, characterized in that: One end of the piston rod on the gas spring (1) is provided with a clamping portion (101), and the clamping spring (7) is clamped with the clamping portion (101).

7. The oil-free gas pressure rod according to claim 6, characterized in that: A limiting portion (102) is provided at one end of the clamping portion (101), and a plane bearing (9) and a flat washer (8) are sleeved on the limiting portion (102). The plane bearing (9) and the flat washer (8) are respectively located at two ends of the second hole body (302), and the flat washer (8) is located between the retaining spring (7) and the second hole body (302). The sum of the heights of the plane bearing (9), the second hole body (302) and the flat washer (8) matches the height of the limiting portion (102).

8. The oil-free gas pressure rod according to claim 7, characterized in that: A shock absorbing pad (6) is sleeved on the piston rod of the gas spring (1), and the shock absorbing pad (6) is located at an end of the limiting portion (102) away from the clamping portion (101).

9. The oil-free gas pressure rod according to claim 4, characterized in that: A fourth hole body (304) is coaxially arranged between the first hole body (301) and the second hole body (302), and the inner contour size of the fourth hole body (304) matches the outer contour size of the sliding cylinder (4).

10. The oil-free gas pressure rod according to claim 9, characterized in that: The sum of the depths of the first hole (301) and the fourth hole (304) matches the length of the sliding cylinder (4).