Press fitting clamp and connecting rod assembly

Abstract

The utility model provides a press fitting clamp and a connecting rod assembly, and relates to the field of engines. The press fitting clamp is used for press fitting of a lining and a connecting rod and comprises a body, a first connecting piece and a second connecting piece, the body is matched with the connecting rod, the first connecting piece is fixedly connected with the body, the second connecting piece slides in the first direction relative to the first connecting piece, the second connecting piece is provided with a guide part matched with the lining, and when the second connecting piece slides in place, the guide part is connected with the lining. The bushing rotates to a mounting position around a first axis relative to the connecting rod, and the first axis is perpendicular to the first direction; by means of the principle that the second connecting piece slides relative to the first connecting piece, the lining is driven to rotate through the guiding part, guiding alignment of the lining and the connecting rod can be rapidly achieved, alignment errors are reduced, and the press-fitting precision is improved.

Description

Technical Field

[0001] The present application relates to the field of engines, and in particular to a press-fit fixture 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. First, the bushing frozen with liquid nitrogen is installed on the pin shaft and fixed by an upper locating sleeve and a lower locating sleeve. Then, a first straight line is drawn on the connecting rod, and the center of the oil hole of the connecting rod is located on the first straight line. Then, a second straight line is drawn on the bushing, and the center of the oil hole of the bushing is located on the second straight line. The bushing is manually rotated until the second straight line is aligned with the first straight line before press fitting can be performed.

[0003] Whether the second straight line is aligned with the first straight line is determined by visual inspection. Therefore, this press-fitting method is not only inefficient, but also has a large error. The defective rate of the pressed products is high, and fast and effective press-fitting cannot be achieved. Utility Model Content

[0004] The purpose of the present application is to provide a press-fitting fixture and a connecting rod assembly, which can greatly improve the alignment efficiency of the connecting rod and the bushing, reduce the error caused by the alignment, and improve the press-fitting accuracy.

[0005] In the first aspect, the utility model provides a press-fitting fixture, which is used for press-fitting of bushings and connecting rods, and includes a main body, a first connecting piece and a second connecting piece. The main body is adapted to the connecting rod, the first connecting piece is fixedly connected to the main body, the second connecting piece slides along a first direction relative to the first connecting piece, and the second connecting piece is provided with a guide portion that cooperates with the bushing. When the second connecting piece slides into place, the bushing rotates around a first axis relative to the connecting rod to an installation position, and the first axis is perpendicular to the first direction.

[0006] In an optional embodiment, the second connecting member is further provided with an avoidance position, the avoidance position is open, and the avoidance position is adapted to the bushing, and the guide portion is arranged at the opening position of the avoidance position.

[0007] In an optional embodiment, the avoidance position is configured as an arc, and the avoidance position has a first end and a second end, and the number of the guide parts is two, one of the guide parts is located at the first end, and the other guide part is located at the second end.

[0008] In an optional embodiment, the second connecting member is axially symmetrically arranged along a second axis, the second axis is perpendicular to the first axis, the center of the avoidance position is located on the second axis, and the two guide parts are respectively located on both sides of the second axis.

[0009] In an optional embodiment, each of the guide portions is arranged to protrude from the inner wall surface of the avoidance position.

[0010] In an optional embodiment, the first connecting member is provided with a sliding groove, the sliding groove penetrates the first connecting member along a first direction, and the second connecting member is penetrated through the sliding groove.

[0011] In an optional embodiment, the main body is provided with a first positioning portion and a second positioning portion, and the second positioning portion is spaced apart from the first positioning portion.

[0012] In an optional embodiment, a cross-sectional area of ​​the first positioning portion is greater than a cross-sectional area of ​​the second positioning portion, and the second connecting member is located on a side of the second positioning portion away from the first positioning portion.

[0013] In a second aspect, the utility model provides a connecting rod assembly, comprising a connecting rod, a bushing and a press-fitting fixture as described in the aforementioned embodiment, wherein the connecting rod and the bushing are both mounted on the press-fitting fixture.

[0014] In an optional embodiment, the bushing is provided with a guide groove, and the guide portion of the press-fitting fixture cooperates with the guide groove to drive the bushing to rotate relative to the connecting rod around the first axis.

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

[0016] Firstly, the present application uses the main body as the base of the press-fitting fixture, so that the press-fitting fixture is easy to move, and the matching setting of the main body and the connecting rod can locate the position of the connecting rod, thereby improving the stability of the press-fitting. Secondly, the present application utilizes the principle of the second connecting member sliding relative to the first connecting member, and drives the bushing to rotate through the guide part, so as to quickly realize the guiding alignment of the bushing and the connecting rod, reduce the alignment error, and improve the press-fitting accuracy. 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 assembly of a connecting rod assembly in some embodiments;

[0019] Figure 2 shows a three-dimensional structural diagram of a connecting rod in some embodiments;

[0020] Figure 3A schematic diagram of the pre-installed connection of the bushing in some embodiments is shown;

[0021] Figure 4 A three-dimensional structural diagram of a press-fit fixture in some embodiments is shown.

[0022] Description of main component symbols:

[0023] 100-connecting rod; 110-big end; 111-first hole; 120-small end; 121-second hole; 122-first oil hole; 200-bushing; 300-pin; 400-upper positioning sleeve; 410-lower positioning sleeve; 420-notch; 500-press-fit fixture; 510-body; 511-first positioning part; 512-second positioning part; 520-first connecting piece; 530-second connecting piece; 531-guide part; 532-avoidance position. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Example

[0030] like Figure 1 and Figure 2 As shown, this embodiment is suitable for press-fitting of a connecting rod 100 and a bushing 200, wherein the connecting rod 100 includes a large end 110 and a small end 120, a first hole 111 is provided at the large end 110, and the first hole 111 passes through the connecting rod 100, a second hole 121 and a first oil hole 122 are provided at the small end 120, an axis of the first oil hole 122 and an axis of the second hole 121 are perpendicular to each other, the second hole 121 is spaced apart from the first hole 111, and the second hole 121 is smaller than the first hole 111, the bushing 200 is a special-shaped structure, and the bushing 200 is interference fit with the second hole 121, the bushing 200 is provided with a second oil hole, and the second oil hole passes through the bushing 200, specifically, the bushing 200 is press-fitted onto the connecting rod 100 by a hydraulic press.

[0031] like Figure 3 As shown, before press-fitting, first, the bushing 200 needs to be pre-installed. Specifically, the bushing 200 is frozen with liquid nitrogen and then installed on the pin 300. The upper positioning sleeve 400 is installed above the bushing 200, and the lower positioning sleeve 410 is installed below the bushing 200. The upper positioning sleeve 400 and the lower positioning sleeve 410 form axial positioning for the bushing 200 to prevent the bushing 200 from sliding up and down, and the bushing 200 and the lower positioning sleeve 410 form a notch 420.

[0032] like Figure 1 and Figure 2As shown, secondly, the bushing 200 and the connecting rod 100 need to be guided and aligned, that is, the bushing 200 rotates around its own axis. For the convenience of description and understanding, the center of the first oil hole 122 is defined as the first center, and the center of the second oil hole is defined as the second center. After the guidance and alignment, the straight line connecting the first center and the second center is defined as the alignment line, and the alignment line is parallel to the axis of the second hole 121.

[0033] like Figure 4 As shown, this embodiment provides a press-fitting fixture 500 . Specifically, the press-fitting fixture 500 includes a body 510 , a first connecting member 520 , and a second connecting member 530 .

[0034] The body 510 is provided with a first positioning portion 511 and a second positioning portion 512 . The cross-sectional area of ​​the first positioning portion 511 is greater than the cross-sectional area of ​​the second positioning portion 512 . The second positioning portion 512 is spaced apart from the first positioning portion 511 .

[0035] like Figure 2 and Figure 4 As shown, the main body 510 is adapted to the connecting rod 100, the first positioning portion 511 is arranged corresponding to the first hole 111, and the second positioning portion 512 is arranged corresponding to the second hole 121. When the connecting rod 100 is placed on the main body 510, the connecting rod 100 and the main body 510 are in a relatively fixed state, thereby improving the stability of the press-fitting.

[0036] It is understandable that, in order to ensure that the connecting rod 100 can remain fixed during the press-fitting process, the connecting rod 100 and the body 510 can be detachably connected by plugging, snapping, or other means to further enhance the fixing effect. For example, a first step is provided on the first positioning portion 511, and the first step is adapted to the large end 110, and a second step is provided on the second positioning portion 512, and the second step is adapted to the small end 120.

[0037] like Figure 1 , Figure 2 and Figure 4 As shown, due to the setting of the main body 510, the operator can freely move the press fixture 500, first place the main body 510 on a horizontal supporting platform, then place the connecting rod 100 horizontally on the main body 510, and finally place the pre-installed bushing 200 vertically in the second hole 121.

[0038] The first connecting member 520 is fixedly connected to the main body 510. Specifically, the first connecting member 520 is a vertical plate structure, and the first connecting member 520 is located at the right end of the main body 510. This embodiment adopts a screw connection method, and the bolts are screwed in from right to left to fix the first connecting member 520 to the main body 510.

[0039] The second connecting member 530 is located at a side of the second positioning portion 512 away from the first positioning portion 511, and the second connecting member 530 slides relative to the first connecting member 520 along a first direction, and the first direction is perpendicular to the axial direction of the second hole 121. Specifically, the first connecting member 520 is provided with a sliding groove, and the sliding groove penetrates the first connecting member 520 along the first direction, and the second connecting member 530 is penetrated in the sliding groove.

[0040] The second connecting member 530 is provided with a guide portion 531 cooperating with the bushing 200, and the guide portion 531 extends into the notch 420. When the second connecting member 530 moves to the left, the guide portion 531 pushes the bushing 200 to rotate until it rotates into place. When the second connecting member 530 moves to the right, the guide portion 531 gradually withdraws from the notch 420.

[0041] The second connecting member 530 is further provided with an escape position 532, which is open and matches the bushing 200, and the guide portion 531 is provided at the opening of the escape position 532. Under the premise that the escape position 532 provides sufficient escape space, the escape position 532 can be set to any shape, which is not limited here.

[0042] In this embodiment, the avoidance position 532 is configured as an arc, and the avoidance position 532 has a first end and a second end, and there are two guide portions 531, one of which is located at the first end, and the other is located at the second end. Specifically, each guide portion 531 is protruding from the inner wall surface of the avoidance position 532.

[0043] Correspondingly, the number of the notches 420 is also two.

[0044] In actual use, the inner wall surface of the avoidance position 532 is matched with the outer wall surface of the bushing 200. When the second connecting member 530 slides into place, the inner wall surface of the avoidance position 532 fits with the outer wall surface of the bushing 200, thereby achieving the positioning function.

[0045] To improve the press-fitting accuracy, the second connecting member 530 of this embodiment is axially symmetrically arranged along the second axis, the second axis is perpendicular to the first axis, the center of the avoidance position 532 is located on the second axis, and the two guide portions 531 are respectively located on both sides of the second axis, thereby realizing mechanical positioning without manual visual inspection and reducing press-fitting errors.

[0046] When the second connecting member 530 slides into place, the bushing 200 rotates relative to the connecting rod 100 around the first axis to the installation position, and the first axis is perpendicular to the first direction. The first axis referred to here is the axis of the bushing 200 itself.

[0047] By providing the guide portion 531 , this embodiment can quickly achieve the guiding alignment of the bushing 200 and the connecting rod 100 , reduce the alignment error, and improve the press-fitting accuracy.

[0048] This embodiment further provides a connecting rod assembly, which includes a connecting rod 100 , a bushing 200 and the above-mentioned press-fitting fixture 500 , and the connecting rod 100 and the bushing 200 are both mounted on the press-fitting fixture 500 .

[0049] The bushing 200 is provided with a guide groove, and the guide portion 531 of the press-fitting fixture 500 cooperates with the guide groove to drive the bushing 200 to rotate around the first axis relative to the connecting rod 100. Specifically, the guide groove here is the above-mentioned notch 420. It is worth noting that in some other embodiments, the guide groove can be formed separately on the bushing 200.

[0050] like Figures 1 to 4 As shown, based on the above content, the press-fitting principle of the connecting rod assembly in this embodiment is further described as follows:

[0051] S100. The bushing 200 is frozen by liquid nitrogen and then installed on the pin 300. The upper positioning sleeve 400 is installed above the bushing 200, and the lower positioning sleeve 410 is installed below the bushing 200. The bushing 200 and the lower positioning sleeve 410 form a gap 420;

[0052] S200. Place the pre-installed bushing 200 into the second hole 121 from top to bottom;

[0053] S300. Push the second connecting member 530 to the left, the second connecting member 530 slides relative to the first connecting member 520, the guide portion 531 extends into the notch 420 and pushes against the bushing 200 to rotate around the first axis, and the two notches 420 are respectively in contact with a corresponding one of the guiding portions;

[0054] S400. After the alignment is completed, the second connecting member 530 is pulled to the right, and each guiding portion is withdrawn from a corresponding notch 420.

[0055] S500 . Start the hydraulic press to press the bushing 200 into the second hole 121 .

[0056] 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.

[0057] 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 fixture for press-fitting bushings and connecting rods, characterized in that: It includes a main body, a first connecting member and a second connecting member, the main body is adapted to the connecting rod, the first connecting member is fixedly connected to the main body, the second connecting member slides along a first direction relative to the first connecting member, and the second connecting member is provided with a guide portion that cooperates with the bushing. When the second connecting member slides into place, the bushing rotates around a first axis to an installation position relative to the connecting rod, and the first axis is perpendicular to the first direction.

2. The press-fitting fixture according to claim 1, characterized in that: The second connecting member is also provided with an avoidance position, which is open and matched with the bushing, and the guide portion is arranged at the opening position of the avoidance position.

3. The press-fitting fixture according to claim 2, characterized in that: The avoidance position is configured as an arc, and the avoidance position is provided with a first end and a second end. The number of the guide parts is two, one of which is located at the first end, and the other is located at the second end.

4. The press-fitting fixture according to claim 3, characterized in that: The second connecting member is axially symmetrically arranged along a second axis, the second axis is perpendicular to the first axis, the center of the avoidance position is located on the second axis, and the two guide parts are respectively located on both sides of the second axis.

5. The press-fitting fixture according to claim 4, characterized in that: Each of the guide portions is arranged to protrude from the inner wall surface of the avoidance position.

6. The press-fitting fixture according to any one of claims 1 to 5, characterized in that: The first connecting member is provided with a sliding groove, the sliding groove penetrates the first connecting member along a first direction, and the second connecting member is penetrated through the sliding groove.

7. The press-fitting fixture according to any one of claims 1 to 5, characterized in that: The main body is provided with a first positioning portion and a second positioning portion, and the second positioning portion is spaced apart from the first positioning portion.

8. The press-fitting fixture according to claim 7, characterized in that: The cross-sectional area of ​​the first positioning portion is greater than the cross-sectional area of ​​the second positioning portion, and the second connecting member is located at a side of the second positioning portion away from the first positioning portion.

9. A connecting rod assembly, characterized in that: It comprises a connecting rod, a bushing and a press-fitting fixture as claimed in any one of claims 1 to 8, wherein the connecting rod and the bushing are both mounted on the press-fitting fixture.

10. The connecting rod assembly according to claim 9, characterized in that The bushing is provided with a guide groove, and the guide portion of the press-fitting fixture cooperates with the guide groove to drive the bushing to rotate relative to the connecting rod around the first axis.

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