Bushing fixing device

Abstract

The utility model relates to a lining fixing device which comprises a pressing rod assembly and a clamp assembly. The clamp assembly comprises a driving part and a fixing part, and the driving part is arranged on the pressing rod assembly and can drive the fixing part to stretch out and draw back in the radial direction so as to fix or loosen a lining; the fixing part comprises an abutting piece and a connecting piece, and the abutting piece is used for abutting against the inner wall face of the bush; the number of the abutting pieces is multiple, the abutting pieces are distributed around the central axis of the lining in a circumferential array mode, the connecting pieces are connected between every two adjacent abutting pieces, and the fixture assembly has the advantage that the fixing effect of the fixture assembly on the lining is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine component assembly, in particular to a bush fixing device. BACKGROUND

[0002] The connecting rod is a force-bearing moving part connected with the piston of an engine and should have sufficient strength under the reciprocating action in the cylinder, so the bush embedded in the small head inner hole of the connecting rod needs to be durable and reliable.

[0003] In the prior art, the assembly of the bush and the connecting rod is usually realized by press-fitting, and the main process is as follows: the connecting rod is fixed on the base of the equipment main body, then the bush is fixed by using a fixing device, and the fixing device and the bush are driven to move downward synchronously to press-fit the bush into the small head inner hole of the connecting rod. The existing fixing device usually comprises a clamp assembly and a press rod assembly, which cooperate with each other to realize the fixing of the bush.

[0004] Among them, the clamp assembly expands radially to exert a radial force on the inner wall of the bush (i.e. the clamp assembly is expanded and tightened from the inside of the bush), thereby realizing the abutting fixing of the bush. However, the existing clamp assembly is prone to expand in a "bell shape" during the tightening process, which may cause the contact between the clamp assembly and the bush to be linear contact, affecting the fixing effect of the clamp assembly on the bush, and further affecting the press-fitting effect of the bush and the connecting rod. SUMMARY

[0005] The technical problem to be solved by the utility model is to overcome the defects in the prior art, thereby providing a bush fixing device.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A bush fixing device comprises a press rod assembly and a clamp assembly; the clamp assembly comprises a driving part and a fixing part, the driving part is arranged on the press rod assembly and can drive the fixing part to expand or contract radially to fix or release the bush; the fixing part comprises an abutting piece and a connecting piece, the abutting piece is used to abut against the inner wall of the bush; the abutting piece is arranged in a plurality of pieces, the plurality of abutting pieces are arranged in a circumferential array around the central axis of the bush, and the connecting piece is connected between two adjacent abutting pieces.

[0008] Preferably, the abutting piece is arranged as a metal sheet or a hard plastic sheet; and the connecting piece is arranged as a flexible rubber sheet.

[0009] Preferably, the width of the connecting piece is equal or gradually decreases along the radial direction of the clamp assembly.

[0010] Preferably, the pressing rod assembly comprises a conical seat, a guide surface with a diameter gradually decreasing from top to bottom is arranged at the lower end of the conical seat; the fixing part is coaxially arranged with the conical seat, and the fixing part can slide along the guide surface so as to extend and retract in the radial direction.

[0011] Preferably, the driving part comprises a driving rod and a boss; the driving rod is slidingly connected with a hollow channel arranged inside the conical seat; the lower end of the driving rod extends out of the hollow channel and is fixedly connected with the boss, and the upper end surface of the boss abuts against the lower end surface of the fixing part.

[0012] Preferably, the hollow channel comprises a first hollow section and a second hollow section arranged at both ends of the first hollow section; an installation gap is formed between the driving rod and the first hollow section; the two ends of the driving rod respectively abut against the inner walls of the second hollow sections at the corresponding ends.

[0013] Preferably, a guide opening is arranged at the lower end of the hollow channel, and the diameter of the guide opening gradually decreases in the installation direction of the driving rod.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The bush fixing device provided by the utility model has the advantages that the abutting pieces are arranged in a circumferential array around the central axis of the bush, the force on the bush is more uniform, and deformation of the bush is avoided. The adjacent abutting pieces are connected through the connecting pieces, the single abutting piece can move in the radial direction, the abutting pieces can be uniformly expanded, the overall diameter of the fixing part is expanded, the outer wall surface of the abutting piece and the inner wall surface of the bush are in surface contact, and the fixing effect of the fixing part on the bush is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The structure schematic view of one of the examples provided by the utility model.

[0018] Figure 2 The explosion schematic view of Figure 1

[0019] The structure schematic view of the fixing part in Figure 3 Figure 2

[0020] ​​Figure 4 is a sectional view. Figure 1

[0021] Figure 5 is an enlarged view of the D1 position in FIG. Figure 4

[0022] Figure 6 is an enlarged view of the D2 position in FIG. Figure 4

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 100, bushing; 1, pressing rod assembly; 11, conical seat; 111, guide surface; 2, clamp assembly; 21, driving part; 211, driving rod; 212, boss; 22, fixed part; 221, abutting piece; 222, connecting piece; 3, hollow channel; 31, first hollow section; 32, second hollow section; 33, guide opening; 4, installation gap. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Referring to Figures 1 to 6 ​​​The utility model embodiment provides a kind of bush fixing device, including pressure rod assembly 1 and clamp assembly 2.Wherein, clamp assembly 2 includes driving portion 21 and fixed portion 22, driving portion 21 is set on pressure rod assembly 1, and fixed portion 22 can be driven to retract along radial, to fix or loosen bush 100;Fixed portion 22 includes abutting member 221 and connecting piece 222, abutting member 221 is used to be in contact with the inner wall surface of bush 100;Abutting member 221 is provided with several, several abutting members 221 are distributed in the form of circular array around the central axis of bush 100, and connecting piece 222 is connected between two adjacent abutting members 221.

[0029] It is not difficult to understand that, in the above scheme, abutting member 221 is distributed in the form of circular array around the central axis of bush 100, can make bush 100 more uniform stress, avoid bush 100 to produce deformation.And adjacent abutting member 221 is connected by connecting piece 222, so that single abutting member 221 can move along radial, each abutting member 221 can be evenly opened, and the overall diameter of fixed portion 22 is expanded, to ensure that the outer wall surface of abutting member 221 is in surface contact with the inner wall surface of bush 100, improve the fixing effect of fixed portion 22 to bush 100.

[0030] For the convenience of explanation, the "upper" in this embodiment refers to the upper of the entire bush fixing device as shown in the figure, and the "lower" refers to the lower of the entire bush fixing device as shown in the figure. Figure 1 "axial direction" is the direction of extending along the center axis of clamp assembly 2 (i.e. Figure 1 from top to bottom or from bottom to top), and "radial direction" is the direction of spreading outward from the center of clamp assembly 2 (i.e. Figure 4 B direction as shown in the figure).

[0031] Specifically, abutting member 221 is provided as a metal sheet or a hard plastic sheet; and connecting piece 222 is provided as a flexible rubber sheet.

[0032] Further, along the radial direction of clamp assembly 2, the width of connecting piece 222 gradually decreases, so that the outer end of connecting piece 222 can be deformed more easily, and the expansion and contraction of abutting member 221 can be facilitated.Of course, in other embodiments, the width of connecting piece 222 can also be equal, as long as it can ensure that abutting member 221 can expand and contract along the radial direction.

[0033] Referring to Figures 1 to 6 , pressure rod assembly 1 includes a conical seat 11, and the lower end of the conical seat 11 is provided with a guide surface 111 with a diameter gradually decreasing from top to bottom;Fixed portion 22 is coaxially arranged with the conical seat 11, and fixed portion 22 can slide along the guide surface 111, so that fixed portion 22 can expand and contract along the radial direction.

[0034] Specifically, the driving part 21 comprises a driving rod 211 and a boss 212; the driving rod 211 is in sliding fit connection with the hollow channel 3 arranged inside the conical seat 11; the lower end of the driving rod 211 extends out of the hollow channel 3 and is fixedly connected with the boss 212, and the upper end surface of the boss 212 abuts against the lower end surface of the fixed part 22.

[0035] It can be understood that the driving rod 211 can drive the boss 212 and the fixed part 22 to move synchronously in the axial direction; when the fixed part 22 moves upward, the fixed part 22 expands (i.e. expands outward in the radial direction) under the action of the conical seat 11, and then abuts against the bushing 100; when the fixed part 22 moves downward, the fixed part 22 contracts (i.e. contracts inward in the radial direction), and then releases the bushing 100.

[0036] In order to ensure the stability of the installation of the driving rod 211, to enable it to stably slide in the axial direction, at the same time, to facilitate the installation of the driving rod 211 and the conical seat 11, and to reduce the processing difficulty of the driving rod 211, in the embodiment, the hollow channel 3 comprises a first hollow section 31 and a second hollow section 32 arranged at both ends of the first hollow section 31; the installation gap 4 is formed between the driving rod 211 and the first hollow section 31; the two ends of the driving rod 211 respectively abut against the inner walls of the corresponding second hollow sections 32.

[0037] Further, the lower end of the hollow channel 3 is provided with a guide opening 33, and the diameter of the guide opening 33 gradually decreases in the installation direction of the driving rod 211 (i.e. in the A direction shown in the figure). Figure 2

[0038] Further, the driving rod 211 can be provided as a cylindrical rod with equal diameters. The driving rod 211 can also be provided as a stepped rod, at this time, the diameter of the middle part of the driving rod 211 can be made smaller than the diameters of the two ends to form a stepped rod.

[0039] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of protection of the utility model, and any non-essential changes and replacements made by the person skilled in the art on the basis of the utility model all belong to the range of protection required by the utility model.​

Claims

1. A bushing fixation device, characterized by, The utility model relates to a press rod assembly (1) and clamp assembly (2) are included; The clamp assembly (2) includes drive part (21) and fixed part (22), drive part (21) is arranged on press rod assembly (1), and drive part (22) can be driven along radial telescopic, to fix or loosen bushing (100); The fixed part (22) includes an abutting member (221) and a connecting member (222), the abutting member (221) is used for abutting with the inner wall surface of the bushing (100); The abutting member (221) is provided with several, and several abutting members (221) are distributed in a circular array around the central axis of the bushing (100), and the connecting member (222) is connected between two adjacent abutting members (221).

2. A bushing fixation device according to claim 1, characterized in that The abutting member (221) is provided as a metal sheet or a hard plastic sheet; the connecting member (222) is provided as a flexible rubber sheet.

3. A bushing fixation device according to claim 1 or 2, characterized in that Along the radial direction of the clamp assembly (2), the connecting member (222) has equal or gradually decreasing width.

4. A bushing fixation device according to claim 1, wherein The press rod assembly (1) includes a conical seat (11), and the lower end of the conical seat (11) is provided with a guide surface (111) with gradually decreasing diameter from top to bottom; The fixed part (22) is coaxially arranged with the conical seat (11), and the fixed part (22) can slide along the guide surface (111) to make the fixed part (22) radially telescopic.

5. A bushing fixation device according to claim 4, wherein The drive part (21) includes a drive rod (211) and a boss (212); The drive rod (211) is slidably connected with a hollow channel (3) arranged on the inner side of the conical seat (11); The lower end of the drive rod (211) extends out of the hollow channel (3) and is fixedly connected with the boss (212), and the upper end surface of the boss (212) abuts against the lower end surface of the fixed part (22).

6. A bushing fixation device according to claim 5, wherein The hollow channel (3) includes a first hollow section (31) and a second hollow section (32) located at both ends of the first hollow section (31); An installation gap (4) is formed between the drive rod (211) and the first hollow section (31); The two ends of the drive rod (211) respectively abut against the inner walls of the corresponding second hollow sections (32).

7. A bushing fixation device according to claim 5 or 6, characterized in that The lower end of the hollow channel (3) is provided with a guide opening (33), Along the installation direction of the drive rod (211), the diameter of the guide opening (33) gradually decreases.

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