Piston device for preventing bearing from falling off

Abstract

The utility model relates to a piston device, especially a piston device preventing bearing from falling off, including support cover and pressure arm, be equipped with the installation groove that supplies pressure arm rotation cooperation on support cover, be equipped with the camber on pressure arm cooperation installation groove, be equipped with half moon bearing device between installation groove and camber, half moon bearing device includes upper cover and lower cover, install the needle in lower cover, be equipped with the mounting hole for fixed lower cover in installation groove, be equipped with the connecting block of cooperation mounting hole on lower cover, lower cover is clamped into mounting hole and realizes fixed limit in installation groove, the utility model discloses the mounting hole for installing bearing lower cover in the installation groove of support cover, the upper cover of bearing is clamped on pressure arm, discarded the structural form that only makes the card slot and the card point on pressure arm on market, connect more reliable and stable, avoid the situation that bearing falls off in the installation process, the utility model still has simple structure, processing is convenient and the characteristics of easy assembly, strong practicality.

Description

Technical Field

[0001] This utility model relates to a piston device, and more particularly to a piston device for preventing bearings from falling off. Background Technology

[0002] Piston assemblies typically consist of a pressure arm inserted into a bracket, with a bracket cover then installed on the bracket to complete the assembly. The bracket cover and pressure arm are rotatably fitted together, with a semi-circular bearing between them. Commercially available piston assemblies typically have grooves cut into the pressure arm and bracket cover, with protrusions on both sides of the grooves to secure the upper and lower covers. The lower cover on the bracket cover is then pushed against the upper cover on the pressure arm for installation. Due to the confined space inside the bracket and the weak securing effect of the protrusions on the bearing cover, the bearing is prone to detaching during installation. Preventing the bearing from detaching during installation is a technical problem that we need to solve. Utility Model Content

[0003] In view of the shortcomings of existing technology, this utility model provides a piston device to prevent bearings from falling off.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a piston device for preventing bearing detachment, characterized in that it includes a support cover and a pressure arm. The support cover is provided with a mounting groove for the pressure arm to rotate and engage. The pressure arm is provided with an arc surface that engages with the mounting groove. A crescent bearing device is provided between the mounting groove and the arc surface. The crescent bearing device includes an upper cover and a lower cover. A needle roller is installed inside the lower cover. The mounting groove is provided with a mounting hole for fixing the lower cover. The lower cover is provided with a connecting block that engages with the mounting hole. The lower cover is fixed and limited in the mounting groove by the connecting block being inserted into the mounting hole. The upper cover is fixed to the arc surface by a snap-fit ​​method.

[0005] The connecting block is fitted with a sleeve, and the connecting block is fixed and limited in the mounting groove by being inserted into the mounting hole through the sleeve in a tight fit.

[0006] The mounting hole has a circular cross-section.

[0007] The arc surface has a first stop and a second stop at its ends, and the top cover has a hook and a spring arm that cooperate with the first stop and the second stop, respectively. The top cover is fixed and limited at the arc surface by the cooperation of the first stop and the hook and the cooperation of the second stop and the spring arm.

[0008] The lower cover is provided with a guide groove for cooperating with the needle roller. The needle roller achieves limited reciprocating motion within the lower cover through the cooperation of the guide groove.

[0009] The lower cover includes a base plate for abutting against the mounting groove and forming a guide groove. A connecting block is disposed on the base plate, and the connecting block forms a 7-shaped structure by extending along the length of the base plate and toward the mounting groove.

[0010] The base plate is provided with a groove for at least partially accommodating the connecting block.

[0011] The bottom of the bracket cover is provided with a limiting hole for installing the push rod. The push rod is provided with a retaining sleeve extending around the side of the push rod. The push rod is inserted into the limiting hole through the retaining sleeve in a tight fit.

[0012] The push rod is provided with a groove for limiting the position of the ferrule. The ferrule is limited on the push rod by being inserted into the groove.

[0013] The card holder is made of copper.

[0014] The beneficial effects of this utility model are as follows: This utility model has a mounting hole for installing the lower cover of the bearing in the mounting groove of the bracket cover, and the upper cover of the bearing is snapped onto the pressure arm. This eliminates the structural form of only making grooves and snap points on the pressure arm in the market. The connection is more reliable and stable, and avoids the bearing falling off during the installation process. This utility model also has the characteristics of simple structure, convenient processing and easy assembly, and strong practicality. Attached Figure Description

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

[0016] Figure 2 This is an exploded view of the structure of this utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This is a cross-sectional view of the present invention;

[0019] Figure 5 for Figure 4 Enlarged view at point B in the middle;

[0020] Figure 6 This is an exploded view of the semi-circular bearing device of this utility model;

[0021] Figure 7 This is an exploded view of the structure of the pressure arm and the upper cover of this utility model.

[0022] Figure 8 This is a schematic diagram of the structure of the lower cover of this utility model;

[0023] Figure 9 This is a schematic diagram of the structure of the bracket cover of this utility model.

[0024] In the diagram: 100, bracket cover; 110, mounting groove; 111, mounting hole; 120, limiting hole; 200, pressure arm; 210, arc surface; 211, first stop part; 212, second stop part; 300, crescent bearing device; 310, upper cover; 311, hook part; 312, spring arm; 320, lower cover; 321, connecting block; 322, sleeve; 323, guide groove; 324, base plate; 325, groove; 326, anti-reverse part; 330, needle roller; 400, push rod; 410, ferrule; 420, groove. Detailed Implementation

[0025] like Figures 1-9 As shown, a piston device for preventing bearing detachment includes a support cover 100 and a pressure arm 200. The support cover 100 has a mounting groove 110 for the pressure arm 200 to rotate and engage. The pressure arm 200 has an arc surface 210 that engages with the mounting groove 110. A crescent bearing device 300 is provided between the mounting groove 110 and the arc surface 210. The crescent bearing device 300 includes an upper cover 310 and a lower cover 320. A needle roller 330 is installed inside the lower cover 320. The mounting groove 110 has a... The mounting hole 111 of the fixed lower cover 320 is provided. The lower cover 320 is provided with a connecting block 321 that matches the mounting hole 111. The lower cover 320 is fixed and limited in the mounting groove 110 by the connecting block 321 being inserted into the mounting hole 111. The upper cover 310 is fixed to the arc surface 210 by snap-fit. The half-moon bearing is a type of needle roller bearing 330, also known as a semi-circular bearing. Both the upper cover 310 and the lower cover 320 have arc-shaped structures. The connecting block 321 and the lower cover 320 can be machined into one piece.

[0026] The connecting block 321 is fitted with a sleeve 322. The connecting block 321 is fixed and limited in the mounting groove 110 by being inserted into the mounting hole 111 through the sleeve 322 in a tight fit. The sleeve 322 can be directly fitted onto the end of the connecting block 321.

[0027] The mounting hole 111 has a circular cross-section, preferably a circular cross-section, which is convenient for processing and has a robust structure.

[0028] The arc surface 210 has a first stop portion 211 and a second stop portion 212 at its beginning and end, respectively. The top cover 310 has a hook portion 311 and a spring arm 312 at its beginning and end, respectively, which cooperate with the first stop portion 211 and the second stop portion 212. The top cover 310 is fixed and limited at the arc surface 210 through the cooperation of the first stop portion 211 and the hook portion 311, and through the cooperation of the second stop portion 212 and the spring arm 312. The hook portion 311, the spring arm 312 and the top cover 310 can be integrally formed.

[0029] The lower cover 320 is provided with a guide groove 323 for cooperating with the needle roller 330. The needle roller 330 achieves limited reciprocating motion within the lower cover 320 through the cooperation of the guide groove 323. Both ends of the guide groove 323 are provided with anti-retraction parts 326 to prevent the needle roller 330 from disengaging from the guide groove 323.

[0030] The lower cover 320 includes a base plate 324 for abutting against the mounting groove 110 and forming a guide groove 323. A connecting block 321 is disposed on the base plate 324. The connecting block 321 forms a 7-shaped structure by extending along the length of the base plate 324 and towards the mounting groove 110. The cross-section of the connecting block 321 in this application preferably adopts a 7-shaped structure. The hook-shaped connecting block 321 can be better fixed in the mounting groove 110 and has strong practicality.

[0031] The base plate 324 is provided with a groove 325 for at least partially accommodating the connecting block 321. The groove 325 can accommodate the portion of the connecting block 321 along the length direction of the base plate 324, reducing the exposure of the connecting block 321. After the lower cover 320 is installed, the projected area of ​​the lower cover 320 is not affected.

[0032] The bottom of the bracket cover 100 is provided with a limiting hole 120 for mounting the push rod 400. The push rod 400 is provided with a retaining sleeve 410 extending around the side of the push rod 400. The push rod 400 is inserted into the limiting hole 120 through the retaining sleeve 410 in a tight fit. In the past, the retaining sleeve 410 was only half-length and had locking points. The push rod 400 was installed manually. The installed push rod 400 was prone to falling off during use. However, this application uses a retaining sleeve 410 that surrounds the push rod 400. The purpose is to use a press to insert the push rod 400 into the limiting hole 120 in a tight fit. The mechanical pressing makes the connection between the push rod 400 and the bracket cover 100 more secure.

[0033] The push rod 400 is provided with a groove 420 for limiting the position of the sleeve 410. The sleeve 410 is limited on the push rod 400 by being inserted into the groove 420.

[0034] The card sleeve 410 is made of copper. In the past, the card sleeve 410 was made of stainless iron, which had low strength and was not wear-resistant. In this application, copper is preferred, which greatly improves wear resistance.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Simple modifications and substitutions made by those skilled in the art without departing from the spirit and scope of this utility model are within its protection scope.

Claims

1. A piston device for preventing bearing detachment, characterized in that, The device includes a bracket cover (100) and a pressure arm (200). The bracket cover (100) has a mounting groove (110) for the pressure arm (200) to rotate. The pressure arm (200) has an arc surface (210) that mates with the mounting groove (110). A crescent bearing device (300) is provided between the mounting groove (110) and the arc surface (210). The crescent bearing device (300) includes an upper cover (310) and a lower cover (320). 20) A needle roller (330) is installed inside. The mounting groove (110) is provided with a mounting hole (111) for fixing the lower cover (320). The lower cover (320) is provided with a connecting block (321) that matches the mounting hole (111). The lower cover (320) is fixed and limited in the mounting groove (110) by the connecting block (321) being inserted into the mounting hole (111). The upper cover (310) is fixed to the arc surface (210) by snap-fit.

2. The piston device for preventing bearing detachment as described in claim 1, characterized in that, The connecting block (321) is fitted with a sleeve (322) on its outside. The connecting block (321) is inserted into the mounting hole (111) through the sleeve (322) in a tight fit to achieve fixed positioning in the mounting groove (110).

3. The piston device for preventing bearing detachment as described in claim 2, characterized in that, The mounting hole (111) has a circular cross-section.

4. The piston device for preventing bearing detachment as described in claim 1, characterized in that, The arc surface (210) has a first stop (211) and a second stop (212) at its ends. The top cover (310) has a hook (311) and a spring arm (312) at its ends that cooperate with the first stop (211) and the second stop (212). The top cover (310) is fixed and limited at the arc surface (210) through the cooperation of the first stop (211) and the hook (311) and through the cooperation of the second stop (212) and the spring arm (312).

5. A piston device for preventing bearing detachment as described in claim 1, characterized in that, The lower cover (320) is provided with a guide groove (323) for cooperating with the needle roller (330). The needle roller (330) achieves limited reciprocating motion within the lower cover (320) through the cooperation of the guide groove (323).

6. A piston device for preventing bearing detachment as described in claim 5, characterized in that, The lower cover (320) includes a base plate (324) for abutting against the mounting groove (110) and forming a guide groove (323). A connecting block (321) is disposed on the base plate (324). The connecting block (321) forms a 7-shaped structure by extending along the length of the base plate (324) and towards the mounting groove (110).

7. A piston device for preventing bearing detachment as described in claim 6, characterized in that, The base plate (324) is provided with a groove (325) for at least partially accommodating the connecting block (321).

8. A piston device for preventing bearing detachment as described in any one of claims 1 to 7, characterized in that, The bottom of the bracket cover (100) is provided with a limiting hole (120) for installing the push rod (400). The push rod (400) is provided with a sleeve (410) extending around the side of the push rod (400). The push rod (400) is inserted into the limiting hole (120) through the sleeve (410) in a tight fit.

9. A piston device for preventing bearing detachment as described in claim 8, characterized in that, The push rod (400) is provided with a groove (420) for limiting the position of the sleeve (410). The sleeve (410) is limited on the push rod (400) by being inserted into the groove (420).

10. A piston device for preventing bearing detachment as described in claim 9, characterized in that, The card sleeve (410) is made of copper.

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