Bush pressing device

Abstract

The utility model provides a bushing press-fit device, which relates to a bushing press-fit process, and comprises a center rod, which comprises a main screw rod, a guide rod and an auxiliary screw rod which are coaxially arranged and are sequentially connected, and the section radiuses of the main screw rod, the guide rod and the auxiliary screw rod are sequentially reduced; the main nut is matched with the main screw rod; the auxiliary nut is matched with the auxiliary screw rod; and the pushing sleeve is slidably arranged on the auxiliary screw in a sleeving mode and located between the auxiliary nut and the guide rod, and the outer diameter of the pushing sleeve is larger than the diameter of the guide rod. The lining pressing device has the functions of guiding and protecting the lining, meanwhile, the lining pressing device can be conveniently withdrawn after pressing is completed, the structure is simple, and high practicability is achieved.

Description

Technical Field

[0001] The present application relates to a bushing pressing process, and in particular to a bushing presser. Background Art

[0002] A bushing refers to a ring sleeve that acts as a gasket. It is often used in mechanical parts where shaft holes need to fit. It has functions such as sealing and wear protection. Because the fit between the bushing and the mounting hole is generally an interference fit, special installation tools are required to press the bushing into the mounting hole.

[0003] In the prior art, a bushing presser is generally used to press the bushing into the mounting hole, such as the bushing presser disclosed in patent application number 201822195359.5 and the hand-held bushing presser disclosed in patent application number 202122505131.3. They both have a guiding function and protect the bushing and the bushing presser respectively. However, when withdrawing the bushing presser in the prior art, it is necessary to manually pull it out. Since there is a large extrusion pressure between the bushing and the bushing presser after the pressing is completed, manual extraction will be hindered by friction and is very strenuous. Removing the bushing presser by hitting with a tool is likely to cause damage to the inner surface of the bushing and even cause the bushing to be dislocated. Utility Model Content

[0004] In order to solve the above-mentioned defects of the related prior art, the present application provides a bushing presser, which has the function of guiding and protecting the bushing and is convenient for withdrawing the bushing presser after the pressing is completed. It has a simple structure and strong practicality.

[0005] In order to achieve the above purpose, the utility model adopts the following technologies:

[0006] A bushing press fitter, used for pressing a bushing into a mounting hole, comprises:

[0007] The center rod comprises a main screw, a guide rod and a secondary screw which are coaxially arranged, wherein the main screw, the guide rod and the secondary screw are connected in sequence and the cross-sectional radius decreases in sequence;

[0008] A main nut, matched with a main screw;

[0009] A secondary nut, matched with the secondary screw;

[0010] The push sleeve and the sliding sleeve are arranged on the auxiliary screw and are located between the auxiliary nut and the guide rod. The outer diameter of the push sleeve is greater than the diameter of the guide rod.

[0011] Furthermore, when the bushing length is greater than or equal to the guide rod length, the sum of the main nut thicknesses is not less than the guide rod length; when the bushing length is less than the guide rod length, the sum of the main nut thicknesses is not less than twice the difference between the guide rod length and the bushing length.

[0012] Furthermore, gaskets are provided between the main nut and the mounting hole and between the auxiliary nut and the pushing sleeve.

[0013] Furthermore, one end of the central rod provided with the auxiliary screw rod is also provided with a clamping head with a hexagonal cross section, and the auxiliary nut can pass through the clamping head.

[0014] Furthermore, the length of the main screw is not less than the length of the bushing, and the length of the auxiliary screw is not less than the length of the push sleeve.

[0015] The beneficial effects of the utility model are:

[0016] A three-section center rod is adopted, and a guide rod is used to align the bushing with the mounting hole. The bushing and the guide rod can be completely close to each other, and the guiding is more precise; a main nut matched with the main screw is used to drive the center rod to move, and a secondary nut matched with the secondary screw is used to drive the push sleeve to push the bushing into the mounting hole, so that the pressing process is more stable and damage to the bushing and the bushing presser is avoided; the movement of the center rod is used to make the guide rod slowly withdraw from the bushing, so as to avoid damage or breakage of the bushing during withdrawal, thereby saving time and effort and improving the pressing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the bushing presser according to the embodiment of the present application when it is installed and ready for pressing.

[0018] Figure 2 It is a partial cross-sectional schematic diagram of the bushing presser according to an embodiment of the present application.

[0019] Figure 3 It is a partial sectional top view of the bushing presser of the embodiment of the present application when the bushing length is smaller than the guide rod.

[0020] Figure 4 It is a partial sectional top view of the bushing press of the embodiment of the present application when the bushing length is greater than the guide rod.

[0021] Markings in the figure: 1-center rod, 11-main screw, 12-guide rod, 13-auxiliary screw, 14-gasket, 15-clamping head, 2-main nut, 3-auxiliary nut, 4-push sleeve, 5-bushing, 6-mounting hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings, but the embodiments described in the utility model are only part of the embodiments of the utility model, rather than all the embodiments.

[0023] like Figure 1As shown, this embodiment provides a bushing presser for pressing a bushing 5 into a mounting hole 6, comprising a center rod 1, a main nut 2, a secondary nut 3, and a push sleeve 4.

[0024] Specifically, Figure 1 and Figure 2 As shown, the center rod 1 is in the shape of a multi-section round rod, including a coaxially arranged main screw 11, a guide rod 12, and a secondary screw 13, wherein the surface of the guide rod 12 is smooth, and its diameter matches the inner diameter of the bushing 5; the surfaces of the main screw 11 and the secondary screw 13 are both provided with threads along their own axes, and the main screw 11, the guide rod 12, and the secondary screw 13 are connected in sequence and the cross-sectional radius decreases in sequence, and the cross-sectional area is a cross-sectional area perpendicular to the axis of the center rod 1.

[0025] Specifically, Figure 1 and Figure 2 As shown, the main nut 2 is provided with at least one, specifically, in this example, two main nuts 2 are provided. The significance of increasing the number of the main nuts 2 is to increase the thickness of the main nuts 2 so as to facilitate the pressing operation of the bushings 5 ​​of different lengths; the main nut 2 is threadedly matched with the main screw 11, which is used to drive the center rod 1 to move axially.

[0026] Specifically, Figure 1 and Figure 2 As shown, the secondary nut 3 is provided with at least one, specifically, in this example, one secondary nut 3 is provided. The significance of increasing the number of the secondary nuts 3 is to increase the firmness of the secondary nuts 3, such as a double-nut or multi-nut fastening structure, so that the secondary nut 3 is more stable during the process of pushing the bushing 5 into the mounting hole 6; the secondary nut 3 is threadedly matched with the secondary screw 13, and is used to push the bushing 5 into the mounting hole 6.

[0027] Specifically, Figure 1 and Figure 2 As shown, the push sleeve 4 is slidably mounted on the auxiliary screw 13 and is located between the auxiliary nut 3 and the guide rod 12. The outer diameter of the push sleeve 4 is larger than the diameter of the guide rod 12 and is used to push the bushing 5 into the mounting hole 6 under the drive of the auxiliary nut 3.

[0028] During operation, first remove the main nut 2, the secondary nut 3, and the push sleeve 4 from the center rod 1, insert the bushing 5 from one end of the secondary screw 13 onto the guide rod 12, and insert the main screw 11 from one end of the mounting hole 6 and out from the other end, so that the mounting hole 6 is in contact with the bushing 5 and coaxially aligned. At this time, first insert the push sleeve 4 into the secondary screw 13, so that the push sleeve 4 is in contact with the bushing 5, and then insert the main nut 2 into the main screw 11, and the secondary nut 3 into the secondary screw 13, rotate the main nut 2 and the secondary nut 3, so that the main nut 2 is in contact with the outer wall of one end of the mounting hole 6, and the secondary nut 3 is in contact with the push sleeve 4.

[0029] After the installation is completed, fix one end of the auxiliary screw 13 in the circumferential direction, rotate the main nut 2, so that the main nut 2 drives the main screw 11 to move axially, and then drives the center rod 1 to move axially, and the axial direction is the direction in which the radius of the center rod 1 increases; at this time, the auxiliary nut 3 moves with the center rod 1, driving the push sleeve 4 to push the bushing 5 into the mounting hole 6.

[0030] After the pressing is completed, first remove the secondary nut 3 and continue to rotate the main nut 2. Since the extrusion pressure between the outer surface of the bushing 5 and the mounting hole 6 is greater than the extrusion pressure between the inner surface of the bushing 5 and the guide rod 12, the friction force between the outer surface of the bushing 5 and the mounting hole 6 is greater than the friction force between the inner surface of the bushing 5 and the guide rod 12, so the center rod 1 will continue to move axially, and the bushing 5 will not move; when the guide rod 12 is completely separated from the bushing 5, the bushing 5 is sleeved on the secondary screw 13 with a radius smaller than the guide rod 12. At this time, you only need to manually pull the secondary screw 13 out of the bushing 5 along the axial direction, and the installation is completed.

[0031] Preferably, Figures 1 to 4 As shown, the length relationship between the bushing 5 and the guide rod 5 will affect the thickness of the main nut 2; Figure 3 As shown, when the length of the bushing 5 is greater than or equal to the length of the guide rod 12, the sum of the thicknesses of the main nut 2 is not less than the length of the guide rod 12. Figure 4 As shown, when the length of the bushing 5 is less than the length of the guide rod 12, the sum of the thicknesses of the main nut 2 is not less than twice the difference between the length of the guide rod 12 and the length of the bushing 5; this design is used to enable the center rod 1 to move a sufficient distance to allow the guide rod 12 to successfully exit the bushing 5.

[0032] Further preferably, Figure 1 and Figure 2 As shown, the length of the main screw 11 is not less than the length of the bushing 5, and the length of the auxiliary screw 13 is not less than the length of the push sleeve 4, so that the main nut 2 and the auxiliary nut 3 can be smoothly inserted into the main screw 11 and the auxiliary screw 13.

[0033] Preferably, Figure 1 and Figure 2 As shown, a gasket 14 is sleeved between the main nut 2 and the mounting hole 6 and between the auxiliary nut 3 and the pushing sleeve 4. The gasket 14 is used to protect the force-bearing surface of the press during pressing and to increase the service life.

[0034] Preferably, Figure 1 and Figure 2 As shown, one end of the auxiliary screw rod 13 is also provided with a clamping head 15 with a hexagonal cross section, and the auxiliary nut 3 can pass through the clamping head 15. When working, the clamping head 15 is clamped with a wrench to fix one end of the auxiliary screw rod 13.

[0035] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A bushing presser for pressing a bushing (5) into a mounting hole (6), characterized in that: include: The center rod (1) comprises a main screw rod (11), a guide rod (12), and a secondary screw rod (13) which are coaxially arranged, wherein the main screw rod (11), the guide rod (12), and the secondary screw rod (13) are connected in sequence and their cross-sectional radius decreases in sequence; A main nut (2) is matched with a main screw (11); A secondary nut (3), matched with the secondary screw (13); The push sleeve (4) is slidably mounted on the auxiliary screw rod (13) and is located between the auxiliary nut (3) and the guide rod (12). The outer diameter of the push sleeve (4) is greater than the diameter of the guide rod (12).

2. The bushing press according to claim 1, characterized in that: When the length of the bushing (5) is greater than or equal to the length of the guide rod (12), the sum of the thicknesses of the main nut (2) is not less than the length of the guide rod (12); when the length of the bushing (5) is less than the length of the guide rod (12), the sum of the thicknesses of the main nut (2) is not less than twice the difference between the length of the guide rod (12) and the length of the bushing (5).

3. The bushing press according to claim 1, characterized in that: Gaskets (14) are sleeved between the main nut (2) and the mounting hole (6) and between the auxiliary nut (3) and the pushing sleeve (4).

4. The bushing presser according to claim 1, characterized in that: One end of the central rod (1) provided with a secondary screw rod (13) is also provided with a clamping head (15) with a hexagonal cross section, and the secondary nut (3) can pass through the clamping head (15).

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