Press fitting jig and connecting rod assembly

Abstract

The utility model provides a press fitting jig and a connecting rod assembly, and relates to the field of engines. The press fitting jig is used for press fitting of a lining and a connecting rod and comprises a body, a pressed part and an elastic part, the body is provided with a first hole extending in the first direction, the connecting rod is arranged on the body, the pressed part is arranged on the connecting rod in a penetrating mode, the lining is arranged on the pressed part in a sleeving mode, and the elastic part is supported between the pressed part and the body in the first direction. When the pressed piece moves to the press-fitting position under the action of external force, the elastic piece is compressed, and the lining is in interference fit with the connecting rod. Through the combined arrangement of the body, the pressed part and the elastic part, the bushing is accurately pressed into the connecting rod, and the press-fitting level and the press-fitting efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of engines, and in particular to a press-fitting jig and a connecting rod assembly. Background Art

[0002] At present, the connecting rod and bushing of the engine are pressed together by a hydraulic press. During the pressing process, the bushing needs to be manually aligned and placed, and then the hydraulic press is started to press it down. Due to the high pressing pressure, the bushing is easily displaced, resulting in unqualified pressed products and waste of materials.

[0003] Therefore, how to solve the press-fitting problem of the bushing and the connecting rod needs to be solved urgently. Utility Model Content

[0004] The purpose of this application is to provide a press-fitting jig and a connecting rod assembly, which can improve the press-fitting efficiency and press-fitting level of the bushing and ensure the product yield.

[0005] In the first aspect, the utility model provides a press-fitting jig, which is used for press-fitting of bushings and connecting rods, and includes a main body, a pressure-bearing part and an elastic part. The main body is provided with a first hole extending along a first direction, the connecting rod is mounted on the main body, the pressure-bearing part is passed through the connecting rod, the bushing is sleeved on the pressure-bearing part, and the elastic part is supported between the pressure-bearing part and the main body along the first direction. When the pressure-bearing part moves to a press-fitting position under the action of an external force, the elastic part is compressed, and the bushing is interference fit with the connecting rod.

[0006] In an optional embodiment, the main body is further provided with a supporting portion, the supporting portion is located in the first hole, and the elastic member is supported between the supporting portion and the pressure-bearing member along a first direction.

[0007] In an optional embodiment, the pressure-bearing member includes a cylinder, a pressure-bearing portion and a protrusion, the cylinder slides along a first direction relative to the supporting portion, the pressure-bearing portion is fixedly connected to the cylinder, and the pressure-bearing portion is located at one end of the cylinder away from the supporting portion, the protrusion is located on a side of the pressure-bearing portion close to the supporting portion, and the elastic member is sleeved on the protrusion.

[0008] In an optional embodiment, the press-fitting jig further includes an upper positioning sleeve and a lower positioning sleeve, wherein the upper positioning sleeve and the lower positioning sleeve are respectively sleeved on the pressure-bearing member along a first direction, and the bushing is located between the upper positioning sleeve and the lower positioning sleeve.

[0009] In an optional embodiment, the lower positioning sleeve is provided with a first limiting portion, and the bushing is provided with a second limiting portion corresponding to the first limiting portion, and the second limiting portion cooperates with the first limiting portion to limit the bushing from rotating relative to the lower positioning sleeve.

[0010] In an optional embodiment, the upper positioning sleeve is provided with a first notch, and the bushing is provided with a second notch communicating with the first notch.

[0011] In an optional embodiment, the main body is further provided with a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are arranged at an interval, and the first positioning portion is provided with the first hole.

[0012] In an optional embodiment, the first positioning portion is provided with a first positioning surface and a second positioning surface, the first positioning surface and the second positioning surface are arranged in parallel, and the first positioning surface is arranged higher than the second positioning surface.

[0013] In an optional embodiment, the second positioning portion is provided with a first abutting surface and a second abutting surface, the first abutting surface and the second abutting surface are arranged at an angle, and the first abutting surface and the first positioning surface are arranged parallel.

[0014] In a second aspect, the utility model provides a connecting rod assembly, including a connecting rod, a bushing and the press-fitting jig described in the aforementioned embodiment, wherein the connecting rod and the bushing are both mounted on the press-fitting jig.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] Firstly, the present application fixes the connecting rod through the main body, and fixes the bushing through the pressure-bearing part, thereby ensuring that during the press-fitting process, the connecting rod and the bushing remain in a relatively fixed state; secondly, the present application uses external force to press the pressure-bearing part to the press-fitting position, thereby directly and accurately press-fitting the bushing into the connecting rod, thereby improving the press-fitting level and efficiency; finally, the present application realizes a floating connection between the pressure-bearing part and the main body through the setting of an elastic part, thereby improving the ease of use of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Shows a schematic diagram of the connection of the connecting rod assembly in some embodiments;

[0019] Figure 2 Shows a schematic diagram of the three-dimensional structure of the connecting rod in some embodiments;

[0020] Figure 3 shows a schematic plan view of a connecting rod in some embodiments;

[0021] Figure 4 Shows a schematic diagram of the connection between the bushing and the upper positioning sleeve and the lower positioning sleeve in some embodiments;

[0022] Figure 5 A schematic plan view of a connecting rod assembly in some embodiments is shown;

[0023] Figure 6 Shows Figure 5 AA section view of the middle bushing before press-fitting;

[0024] Figure 7 Shows Figure 5 AA section view after the middle bushing is pressed;

[0025] Figure 8 A schematic diagram of the structure of the body in some embodiments is shown.

[0026] Description of main component symbols:

[0027] 100-connecting rod; 110-big end; 111-big hole; 120-small end; 121-small hole; 200-bushing; 210-second notch; 220-second limiting part; 300-pressing fixture; 310-main body; 311-first positioning part; 3111-first hole; 3112-first positioning surface; 3113-second positioning surface; 312-second positioning part; 3121-first abutting surface; 3122-second abutting surface; 313-supporting part; 3131-mounting hole; 320-pressure-bearing member; 321-cylinder; 322-pressure-bearing part; 323-protrusion; 324-bolt; 330-elastic member; 340-upper positioning sleeve; 341-first notch; 342-limiting part; 350-lower positioning sleeve; 351-first limiting part; d-gap. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] Example

[0034] See also Figure 1 This embodiment is suitable for press-fitting the connecting rod 100 and the bushing 200 .

[0035] See also Figure 1 and Figure 2The connecting rod 100 includes a large end 110 and a small end 120 . A large hole 111 is provided at the large end 110 , and a small hole 121 is provided at the small end 120 . The small hole 121 is spaced apart from the large hole 111 , and the small hole 121 and the large hole 111 respectively penetrate the connecting rod 100 .

[0036] See also Figure 2 , Figure 3 and Figure 4 The bushing 200 is a special-shaped structure, and the bushing 200 is interference fit with the small hole 121. Specifically, the bushing 200 is pressed onto the connecting rod 100 by a hydraulic press. After the press-fitting is completed, the upper surface of the bushing 200 forms a flat whole with the upper surface of the connecting rod 100, and the lower surface of the bushing 200 forms a flat whole with the lower surface of the connecting rod 100.

[0037] See also Figure 5 and Figure 6 This embodiment provides a press-fitting fixture 300 . Specifically, the press-fitting fixture 300 includes a main body 310 , a pressure-bearing member 320 , and an elastic member 330 .

[0038] See also Figure 7 and Figure 8 The main body 310 is provided with a first hole 3111 extending along a first direction, and the first direction is a vertical direction. Due to the arrangement of the main body 310, this embodiment can be freely moved, which is convenient for operators to use.

[0039] The body 310 is further provided with a first positioning portion 311 , a second positioning portion 312 and a supporting portion 313 . The first positioning portion 311 and the second positioning portion 312 are spaced apart. The first positioning portion 311 is provided with the above-mentioned first hole 3111 , and the supporting portion 313 is located in the first hole 3111 .

[0040] The first positioning portion 311 is provided with a first positioning surface 3112 and a second positioning surface 3113 . The first positioning surface 3112 and the second positioning surface 3113 are arranged in parallel, and the first positioning surface 3112 is arranged higher than the second positioning surface 3113 .

[0041] In this embodiment, the first positioning portion 311 is configured as a cylindrical structure, the first hole 3111 is the space inside the cylinder, and one end of the first positioning portion 311 forms the above-mentioned first positioning surface 3112 and the second positioning surface 3113, and the first positioning surface 3112 and the second positioning surface 3113 constitute a complete contact surface, and the contact surface cooperates with the lower surface of the small end 120 to play a positioning role to prevent the connecting rod 100 from moving.

[0042] The second positioning portion 312 is configured as a boss structure, and the second positioning portion 312 is provided with a first abutting surface 3121 and a second abutting surface 3122. The first abutting surface 3121 is a step surface, and the first abutting surface 3121 and the second abutting surface 3122 are arranged at an angle, and the first abutting surface 3121 is arranged parallel to the first positioning surface 3112. At this time, the first abutting surface 3121 cooperates with the lower surface of the large end 110, and the second abutting surface 3122 cooperates with the hole wall of the large hole 111, which further plays a positioning role to prevent the connecting rod 100 from moving.

[0043] In this embodiment, the first positioning portion 311 and the second positioning portion 312 are provided to position and limit the connecting rod 100, thereby ensuring that the connecting rod 100 will not move under the action of external force during the press-fitting process, that is, the connecting rod 100 is in a relatively fixed state.

[0044] Please refer to 6 to Figure 8 The support portion 313 is cylindrical in structure, and a mounting hole 3131 is provided at the upper end of the support portion 313 .

[0045] The pressure piece 320 is passed through the connecting rod 100, and the bushing 200 is sleeved on the pressure piece 320. Specifically, the pressure piece 320 is located in the small hole 121, and the pressure piece 320 at least partially abuts against the hole wall of the small hole 121. Therefore, during the press-fitting process, the pressure piece 320 slides along the hole wall of the small hole 121, ensuring that the pressure piece 320 can slide smoothly along the first direction, avoiding the pressure piece 320 from tilting or detaching under the action of external force.

[0046] Specifically, the pressure-bearing member 320 includes a cylinder 321, a pressure-bearing portion 322 and a protrusion 323. The cylinder 321 abuts against the hole wall of the small hole 121, and the cylinder 321 slides along the first direction relative to the support portion 313. The pressure-bearing portion 322 is fixedly connected to the cylinder 321, and the pressure-bearing portion 322 is located at one end of the cylinder 321 away from the support portion 313, and the protrusion 323 is located on the side of the pressure-bearing portion 322 close to the support portion 313.

[0047] The cylinder 321 is provided with a cylindrical inner cavity, and both ends of the cylinder 321 are opened, the support part 313 is inserted into the lower opening of the cylinder 321, the pressure-bearing part 322 is a plate-like structure, and the pressure-bearing part 322 is connected to the upper end of the cylinder 321 by bolts 324, and the protrusion 323 is integrally formed with the pressure-bearing part 320.

[0048] The elastic member 330 is supported between the pressure-bearing member 320 and the body 310 along the first direction. In this embodiment, the elastic member 330 is supported between the support portion 313 and the pressure-bearing member 320 along the first direction. One end of the elastic member 330 is sleeved on the protrusion 323, and the other end is supported on the bottom of the mounting hole 3131. It is worth noting that the outer diameter of the protrusion 323 is smaller than the hole diameter of the mounting hole 3131. When pressed into place, the protrusion 323 is inserted into the mounting hole 3131.

[0049] When the pressure piece 320 moves to the press-fitting position under the action of external force, the elastic piece 330 is compressed, and the bushing 200 is interference-fitted with the connecting rod 100. In this embodiment, the cylinder 321 abutting the bottom of the first hole 3111 is used as the standard for reaching the press-fitting position, which can effectively reduce the difficulty of operation, and does not require manual control of the pressing amount, which is convenient and accurate.

[0050] In this embodiment, the friction force between the bushing 200 and the connecting rod 100 can be set to be greater than the elastic force of the elastic member 330. Therefore, after the press-fitting is completed, the elastic member 330 remains in a compressed state, or the elastic member 330 can only restore a smaller deformation. When the press-fitted connecting rod 100 is taken out, the pressure member 320 is no longer subjected to force, and the elastic member 330 returns to its original position.

[0051] See also Figure 4 , Figure 6 and Figure 7 In order to limit the axial movement of the bushing 200, the present embodiment further includes an upper positioning sleeve 340 and a lower positioning sleeve 350. The upper positioning sleeve 340 and the lower positioning sleeve 350 are respectively sleeved on the pressure-bearing member 320 along the first direction. The bushing 200 is located between the upper positioning sleeve 340 and the lower positioning sleeve 350, and the upper end surface of the bushing 200 is matched with the lower end surface of the upper positioning sleeve 340, and the lower end surface of the bushing 200 is matched with the upper end surface of the lower positioning sleeve 350.

[0052] The upper positioning sleeve 340 is provided with a first notch 341, and the bushing 200 is provided with a second notch 210 connected with the first notch 341. It can be understood that the second notch 210 is connected with the first notch 341 to form a larger notch. The operator can use the large notch to guide the bushing 200 to ensure that the bushing 200 with a special-shaped structure enters the small hole 121 at a preset position.

[0053] The lower positioning sleeve 350 is provided with a first limiting portion 351, and the bushing 200 is provided with a second limiting portion 220 corresponding to the first limiting portion 351. The second limiting portion 220 cooperates with the first limiting portion 351 to limit the bushing 200 from rotating relative to the lower positioning sleeve 350. In the press-fit position, the upper end surface of the lower positioning sleeve 350 is adapted to the upper surface shape of the first positioning portion 311.

[0054] In actual use, the upper positioning sleeve 340 is provided with a limiting portion 342, and the limiting portion 342 is covered on the pressure-bearing portion 322. The lower positioning sleeve 350 is fixedly connected to the cylinder 321 by bonding, welding, etc., and in the press-fit position, there is a gap d between the lower positioning sleeve 350 and the hole wall of the first hole 3111 to facilitate subsequent use.

[0055] Please continue reading Figure 1 The present embodiment further provides a connecting rod assembly, which includes a connecting rod 100 , a bushing 200 and the above-mentioned press-fitting fixture 300 , and the connecting rod 100 and the bushing 200 are both mounted on the press-fitting fixture 300 .

[0056] See also Figure 6 and Figure 7 Based on the above content, the press-fitting principle of the connecting rod assembly in this embodiment is further described as follows:

[0057] S100. The lower positioning sleeve 350 is pre-mounted on the pressure member 320. At this time, the elastic member 330 is located in the original position, and the pressure member 320 is in a floating state relative to the body 310;

[0058] S200. The connecting rod 100 is inserted into the pressure member 320 from top to bottom, and then placed on the body 310, the pressure member 320 contacts the wall of the small hole 121 of the connecting rod 100;

[0059] S300. The bushing 200 is installed to the pressure-bearing member 320 after being frozen by liquid nitrogen, and the lower end surface of the bushing 200 is matched with the upper end surface of the lower positioning sleeve 350;

[0060] S400. The upper positioning sleeve 340 is installed, and the lower end surface of the upper positioning sleeve 340 is matched with the upper end surface of the bushing 200;

[0061] S500. Start the hydraulic press, press the bushing 200 into the small hole 121, the pressure member 320 slides downward, the elastic member 330 is compressed, and the bushing 200 is thawed and has an interference fit with the connecting rod 100;

[0062] S600. Remove the upper positioning sleeve 340 and take out the press-fitted connecting rod assembly. The elastic member 330 recovers its deformation to the original position and the pressure-bearing member 320 slides upward to prepare for the next press-fitting.

[0063] It is understandable that step S100 is only required to be performed during the first press-fitting, and the lower positioning sleeve 350 is no longer removed after the subsequent press-fitting is completed. Therefore, the lower positioning sleeve 350 can be used continuously, saving the operating process and simplifying the press-fitting steps.

[0064] This embodiment is simple and convenient, can greatly improve the press-fitting efficiency and press-fitting level, ensure the press-fitting product yield, and provide a more labor-saving press-fitting method for the press-fitting of the bushing 200 and the connecting rod 100 .

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A press-fitting jig for press-fitting bushings and connecting rods, characterized in that: It includes a main body, a pressure-bearing part and an elastic part. The main body is provided with a first hole extending along a first direction. The connecting rod is installed on the main body. The pressure-bearing part is passed through the connecting rod. The bushing is sleeved on the pressure-bearing part. The elastic part is supported between the pressure-bearing part and the main body along the first direction. When the pressure-bearing part moves to a press-fitting position under the action of an external force, the elastic part is compressed, and the bushing is interference-fitted with the connecting rod.

2. The press-fitting jig according to claim 1, characterized in that: The main body is further provided with a supporting portion, the supporting portion is located in the first hole, and the elastic member is supported between the supporting portion and the pressure-bearing member along a first direction.

3. The press-fitting jig according to claim 2, characterized in that: The pressure-bearing member includes a cylinder, a pressure-bearing portion and a protrusion. The cylinder slides along a first direction relative to the support portion. The pressure-bearing portion is fixedly connected to the cylinder, and the pressure-bearing portion is located at an end of the cylinder away from the support portion. The protrusion is located on a side of the pressure-bearing portion close to the support portion, and the elastic member is sleeved on the protrusion.

4. The press-fitting jig according to any one of claims 1 to 3, characterized in that: It also includes an upper positioning sleeve and a lower positioning sleeve, wherein the upper positioning sleeve and the lower positioning sleeve are respectively sleeved on the pressure-bearing member along a first direction, and the bushing is located between the upper positioning sleeve and the lower positioning sleeve.

5. The press-fitting jig according to claim 4, characterized in that: The lower positioning sleeve is provided with a first limiting portion, and the bushing is provided with a second limiting portion corresponding to the first limiting portion, and the second limiting portion cooperates with the first limiting portion to limit the bushing from rotating relative to the lower positioning sleeve.

6. The press-fitting jig according to claim 4, characterized in that: The upper positioning sleeve is provided with a first notch, and the bushing is provided with a second notch communicating with the first notch.

7. The press-fitting jig according to any one of claims 1 to 3, characterized in that: The main body is further provided with a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are arranged at an interval, and the first positioning portion is provided with the first hole.

8. The press-fitting jig according to claim 7, characterized in that: The first positioning portion is provided with a first positioning surface and a second positioning surface. The first positioning surface and the second positioning surface are arranged in parallel, and the first positioning surface is arranged higher than the second positioning surface.

9. The press-fitting jig according to claim 8, characterized in that: The second positioning portion is provided with a first abutting surface and a second abutting surface, the first abutting surface and the second abutting surface are arranged at an angle, and the first abutting surface and the first positioning surface are arranged in parallel.

10. A connecting rod assembly, characterized in that: It comprises a connecting rod, a bushing and a press-fitting jig as claimed in any one of claims 1 to 9, wherein the connecting rod and the bushing are both mounted on the press-fitting jig.

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