Lubricating structure of short-stroke electric cylinder

Abstract

The invention relates to the technical field of electric cylinders, and provides a lubricating structure of a short-stroke electric cylinder which comprises a cylinder body, a nut arranged in the cylinder body and matched with a lead screw, and a piston fixedly arranged outside the nut in a sleeving mode and matched with the cylinder body in a guiding mode in the axial direction. The lubricating structure is characterized in that the lubricating structure comprises a first oil injection hole penetrating through the inner side wall and the outer side wall of the cylinder body, a second oil injection hole penetrating through the inner side wall and the outer side wall of the piston and two or more third oil injection holes penetrating through the inner side wall and the outer side wall of the nut, the third oil injection holes are distributed at intervals in the axis direction of the nut, and the first oil injection hole and the second oil injection hole are long-strip-shaped holes and are communicated in a right-facing mode; the second oil injection hole covers all the third oil injection holes; the first oil injection hole is blocked by an oil injection cover plate. The short-stroke electric cylinder overcomes the defects in the prior art, is reasonable in design and sufficient in lubrication, and solves the technical problem that the service life of an existing short-stroke electric cylinder is affected due to insufficient lubrication of a lead screw.

Description

Technical Field

[0001] The invention relates to the technical field of electric cylinders, and in particular to a lubrication structure of a short-stroke electric cylinder. Background Art

[0002] A short-stroke electric cylinder, that is, an electric cylinder in which the movement stroke of the nut inside the cylinder is smaller than the length of the nut axis, if the traditional single-hole grease adding structure at the rear end of the cylinder body is used, will result in only the rear end of the screw being lubricated, while the middle area, especially the front end area, will not be effectively lubricated, which will greatly affect the service life of the electric cylinder.

[0003] Therefore, we propose a lubrication structure for short-stroke electric cylinder. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a lubrication structure for a short-stroke electric cylinder, which overcomes the deficiencies in the prior art, has a reasonable design, and provides sufficient lubrication, thereby solving the technical problem that the service life of the prior short-stroke electric cylinder is affected by insufficient lubrication of the screw rod.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A lubrication structure for a short-stroke electric cylinder, the electric cylinder comprising a cylinder body, a nut arranged inside the cylinder body and cooperating with a lead screw, and a piston fixedly sleeved outside the nut and cooperating with the cylinder body along an axial guide, characterized in that:

[0009] The lubrication structure comprises a first oil injection hole penetrating the inner and outer walls of the cylinder body, a second oil injection hole penetrating the inner and outer walls of the piston, and a third oil injection hole penetrating the inner and outer walls of the nut. More than two third oil injection holes are provided and are spaced apart along the axis direction of the nut. Both the first oil injection hole and the second oil injection hole are long holes and are directly connected. The second oil injection hole covers all the third oil injection holes.

[0010] The first oil filling hole is blocked by an oil filling cover plate.

[0011] Furthermore, an oil inlet pipe is provided in the second oil filling hole, and the oil inlet pipe has a joint inserted into the third oil filling hole.

[0012] Furthermore, the cross-section of the oil inlet pipe is waist-shaped and covers more than two third oil filling holes.

[0013] Further, each of the third oil filling holes is provided with an opening and closing assembly, the opening and closing assembly includes a plug, a diaphragm, a mounting sleeve, a limiting ring and a first spring, the limiting ring, the mounting sleeve, the first spring and the plug are sequentially installed in the third oil filling hole, the plug includes a columnar rod body, a bottom plate connected to the bottom of the rod body, the bottom plate is provided with a hollow hole around the rod body, the rod body of the plug faces the diaphragm, and the bottom plate is threadedly connected to the third oil filling hole, the diaphragm is installed at the end of the mounting sleeve and an opening is provided at the center thereof, the mounting sleeve is slidably inserted into the third oil filling hole, the limiting ring is installed at the end of the third oil filling hole, and the two ends of the first spring respectively abut against the step surfaces of the mounting sleeve and the third oil filling hole;

[0014] The inner side of the oil filling cover plate is provided with a pressing sleeve for pressing the mounting sleeve, the pressing sleeve corresponds to the mounting sleeve one by one and can pass through the limiting ring to press the mounting sleeve or the diaphragm;

[0015] When the pressing sleeve is separated from the installation sleeve, the installation sleeve abuts against the limiting ring under the action of the first spring, so that the front end of the rod body of the plug is separated from the opening of the diaphragm, and the opening is opened;

[0016] When the pressing sleeve penetrates the limiting ring and squeezes the installation sleeve inward, the front end of the rod body of the plug is inserted into the opening of the module, and the opening is blocked.

[0017] Furthermore, the diaphragm is located at the edge of the opening and extends outward to form a thickened lip, and the rod body of the plug is in contact with the lip.

[0018] Furthermore, the rod body and the lip are in conical sealing cooperation.

[0019] Furthermore, a guide groove running through the piston from front to back is provided on the outer wall of the piston, the guide groove and the second oil filling hole are respectively arranged at the radial ends of the piston, and a guide key is fixed to the inner wall of the cylinder body, and the guide key is slidably matched with the guide groove.

[0020] Furthermore, the middle area of ​​the two side walls of the guide groove is inwardly recessed to form a positioning groove, and a sliding block is installed in the positioning groove, and the sliding block is slidably matched with the guide key.

[0021] (III) Beneficial effects

[0022] The present invention provides a lubrication structure for a short-stroke electric cylinder, which has the following beneficial effects: it breaks through the conventional structure of adding grease to a single hole at the tail end of a traditional cylinder body, by changing the number of third oil filling holes on the side wall of the nut and distributing the third oil filling holes at intervals along the axis of the nut, and at the same time, adaptively adjusting the shapes of the first oil filling hole of the cylinder body and the second oil filling hole of the piston, so that the grease can fill the inner cavity of the nut along the axial direction, and then the nut can effectively lubricate various areas of the screw rod during the subsequent reciprocating motion, thereby extending the service life of the electric cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the first viewing angle of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the explosion structure of Embodiment 1 of the present invention from a first viewing angle;

[0025] Figure 3 It is a schematic diagram of the explosion structure of the second viewing angle of the embodiment 1 of the present invention;

[0026] Figure 4 is a cross-sectional schematic diagram of embodiment 1 of the present invention;

[0027] Figure 5 for Figure 4 The structural schematic diagram after partial enlargement of A in the middle;

[0028] Figure 6 This is a schematic diagram of the exploded structure of the opening and closing assembly in Example 2 of the present invention; Figure 7 It is a cross-sectional schematic diagram of the opening and closing assembly in Example 2 of the present invention.

[0029] In the figure:

[0030] 1. Cylinder body;

[0031] 1a, first oil filling hole;

[0032] 2. Piston;

[0033] 2a, second oil filling hole;

[0034] 2b, guide groove;

[0035] 2c, positioning groove;

[0036] 3. Nut;

[0037] 3a, the third oil filling hole;

[0038] 4. Oil filling cover;

[0039] 4a, press sleeve;

[0040] 5. Lock the bolts;

[0041] 6. Oil inlet pipe;

[0042] 7. Guide key;

[0043] 8. Slider;

[0044] 9. Plug;

[0045] 91, rod body;

[0046] 92. Bottom plate;

[0047] 10. First spring;

[0048] 11. Limiting ring;

[0049] 12. Install the sleeve;

[0050] 13. Diaphragm;

[0051] 13a. Lips. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] Refer to the attached Figure 1-5 , a lubrication structure of a short-stroke electric cylinder, the electric cylinder comprises a cylinder body 1, a nut 3 arranged inside the cylinder body 1 and matched with a screw rod, and a piston 2 fixedly sleeved outside the nut 3 and matched with the cylinder body 1 along the axial guide;

[0055] The lubrication structure comprises a first oil injection hole 1a penetrating the inner and outer walls of the cylinder body 1, a second oil injection hole 2a penetrating the inner and outer walls of the piston 2, and a third oil injection hole 3a penetrating the inner and outer walls of the nut 3. More than two third oil injection holes 3a are provided and are spaced apart along the axial direction of the nut 3. Both the first oil injection hole 1a and the second oil injection hole 2a are long holes and are directly connected. The second oil injection hole 2a covers all the third oil injection holes 3a.

[0056] The first oil filling hole 1 a is blocked by an oil filling cover plate 4 .

[0057] In this embodiment, there are four second oil injection holes 2a, and a pair of oil inlet pipes 6 are provided in the second oil injection holes 2a. The oil inlet pipes 6 have joints inserted into the third oil injection holes 3a. The cross-section of the oil inlet pipes 6 is waist-shaped and covers two third oil injection holes 3a. The provision of the oil inlet pipes 6 can improve the strength of the nut 3 and ensure a stable and reliable structure.

[0058] In this embodiment, a guide groove 2b is provided on the outer wall of the piston 2, which runs through the front and back. The guide groove 2b and the second oil filling hole 2a are respectively arranged at the radial ends of the piston 2. A guide key 7 is fixed on the inner wall of the cylinder body 1. The guide key 7 and the oil filling cover plate 4 are fixed to the cylinder body 1 by locking bolts 5. The guide key 7 is slidably matched with the guide groove 2b. Among them, the middle area of ​​the two side walls of the guide groove 2b is concavely formed to form a positioning groove 2c. A slider 8 is installed in the positioning groove 2c. The slider is slidably matched with the guide key 7. The piston 2 of the traditional electric cylinder has a pair of guide grooves 2b at both radial ends. In this embodiment, the guide groove 2b on one side is cancelled and replaced by the second oil filling hole 2a. In order to ensure the smoothness of the guide, a pair of sliders 8 are added to the guide groove 2b. At the same time, the slider 8 is installed in the positioning groove 2c in an embedded manner and is limited by the two side walls of the positioning groove 2c (located in the axial direction of the piston 2). No bolt locking is required, and the structure is simple and the processing is convenient.

[0059] Example 2

[0060] See attached Figure 6 , 7 Compared with Example 1, Example 2 omits the oil inlet pipe and adds an opening and closing component. Specifically, each of the third oil filling holes is provided with an opening and closing assembly, which includes a plug 9, a diaphragm 13, a mounting sleeve 12, a limiting ring 11 and a first spring 10. The limiting ring 11, the mounting sleeve 12, the first spring 10 and the plug 9 are sequentially installed in the third oil filling hole. The plug 9 includes a columnar rod body 91 and a bottom plate 92 connected to the bottom of the rod body 91. The bottom plate 92 is provided with a hollow hole around the rod body 91. The rod body 91 of the plug 9 faces the diaphragm 13, and its bottom plate 92 is threadedly connected to the third oil filling hole. The diaphragm 13 is installed at the end of the mounting sleeve 12 and an opening is opened in the center thereof. The mounting sleeve 12 is slidably inserted into the third oil filling hole. The limiting ring 11 is threadedly connected to the end of the third oil filling hole. The two ends of the first spring 10 respectively abut against the mounting sleeve 12 and the inner step surface (or bottom plate 92) of the third oil filling hole.

[0061] The inner side of the oil filling cover plate is provided with a pressing sleeve 4a for pressing the mounting sleeve 12. The pressing sleeve 4a corresponds to the mounting sleeve 12 one by one and can pass through the limiting ring 11 to press the mounting sleeve 12 or the diaphragm 13.

[0062] When the oil filling cover is opened and the pressing sleeve 4a is separated from the installation sleeve 12, the installation sleeve 12 is pressed against the limit ring 11 under the action of the first spring 10, so that the front end of the rod body 91 of the plug 9 is separated from the opening of the diaphragm 13, and the opening is opened;

[0063] When the oil filling cover is fixed to the first oil filling hole by the locking bolts, the pressing sleeve 4a penetrates the limiting ring 11 to squeeze the mounting sleeve 12 inward, so that the front end of the rod body 91 of the plug 9 is inserted into the opening of the module, and the opening is blocked.

[0064] The setting of the opening and closing structure can prevent grease from leaking from the third oil filling hole, ensure effective lubrication of the screw rod, and reduce the addition of grease, thereby avoiding technical problems such as overheating and carbonization caused by excessive addition of grease.

[0065] In this embodiment, the diaphragm 13 is located at the edge of the opening and extends outward to form a thickened lip 13a, and the rod 91 of the plug 9 is in contact with the lip 13a. Specifically, the rod 91 and the lip 13a are in a conical sealing fit. The lip 13a can increase the contact surface between the diaphragm 13 and the plug 9, and the conical fit can further improve the sealing effect of the two.

[0066] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lubrication structure for a short-stroke electric cylinder, the electric cylinder comprising a cylinder body, a nut arranged inside the cylinder body and cooperating with a screw rod, and a piston fixedly sleeved outside the nut and cooperating with the cylinder body along an axial guide, characterized in that: The lubrication structure comprises a first oil injection hole penetrating the inner and outer walls of the cylinder body, a second oil injection hole penetrating the inner and outer walls of the piston, and a third oil injection hole penetrating the inner and outer walls of the nut. More than two third oil injection holes are provided and are spaced apart along the axis direction of the nut. Both the first oil injection hole and the second oil injection hole are long holes and are directly connected. The second oil injection hole covers all the third oil injection holes. The first oil filling hole is blocked by an oil filling cover plate.

2. The lubrication structure of a short-stroke electric cylinder according to claim 1, characterized in that: An oil inlet pipe is arranged in the second oil filling hole, and the oil inlet pipe has a joint inserted into the third oil filling hole.

3. A lubrication structure for a short-stroke electric cylinder as claimed in claim 2, characterized in that: The cross section of the oil inlet pipe is waist-shaped and covers more than two third oil injection holes.

4. The lubrication structure of a short-stroke electric cylinder according to claim 1, characterized in that: Each of the third oil filling holes is provided with an opening and closing assembly, which includes a plug, a diaphragm, a mounting sleeve, a limiting ring and a first spring. The limiting ring, the mounting sleeve, the first spring and the plug are sequentially installed in the third oil filling hole. The plug includes a columnar rod body and a bottom plate connected to the bottom of the rod body. The bottom plate is provided with a hollow hole around the rod body. The rod body of the plug faces the diaphragm, and the bottom plate is threadedly connected to the third oil filling hole. The diaphragm is installed at the end of the mounting sleeve and an opening is provided at the center thereof. The mounting sleeve is slidably inserted into the third oil filling hole. The limiting ring is installed at the end of the third oil filling hole. The two ends of the first spring respectively abut against the step surfaces of the mounting sleeve and the third oil filling hole. The inner side of the oil filling cover plate is provided with a pressing sleeve for pressing the mounting sleeve, the pressing sleeve corresponds to the mounting sleeve one by one and can pass through the limiting ring to press the mounting sleeve or the diaphragm; When the pressing sleeve is separated from the installation sleeve, the installation sleeve abuts against the limiting ring under the action of the first spring, so that the front end of the rod body of the plug is separated from the opening of the diaphragm, and the opening is opened; When the pressing sleeve penetrates the limiting ring and squeezes the installation sleeve inward, the front end of the rod body of the plug is inserted into the opening of the module, and the opening is blocked.

5. The lubrication structure of a short-stroke electric cylinder according to claim 4, characterized in that: The diaphragm is located at the edge of the opening and extends outward to form a thickened lip, and the rod body of the plug is in contact with the lip.

6. A lubrication structure for a short-stroke electric cylinder as claimed in claim 5, characterized in that: The rod body and the lip are in conical sealing cooperation.

7. A lubrication structure for a short-stroke electric cylinder as claimed in any one of claims 1 to 6, characterized in that: A guide groove running through the piston is provided on the outer wall of the piston, the guide groove and the second oil filling hole are respectively arranged at two radial ends of the piston, and a guide key is fixed on the inner wall of the cylinder body, and the guide key is slidably matched with the guide groove.

8. The lubrication structure of a short-stroke electric cylinder according to claim 7, characterized in that: The middle area of ​​the two side walls of the guide groove is inwardly recessed to form a positioning groove, and a sliding block is installed in the positioning groove, and the sliding block is slidably matched with the guide key.

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