Crankshaft rear oil seal press tool

Abstract

The utility model discloses a kind of crankshaft rear oil seal press-fit tools, including orientation positioning module, press-fit execution module and power input module.Oriented positioning module is equipped with the oil seal guide seat and the compression bolt of symmetrical distribution with crankshaft end face adhesion;Press-fit execution module includes center transmission shaft mechanism and the press-fit disc with annular pressure distribution surface, and center transmission shaft is connected with guide seat and press-fit disc respectively by positive and negative thread;Power input module is equipped with hex head interface connection rotary drive tool.The utility model replaces impact assembly by screw transmission, realizes the accurate positioning and even press-fit of oil seal, solves the problem of poor sealing, lip damage and complicated process caused by traditional technology, significantly improves assembly efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the technical field of engine assembly, and in particular to a crankshaft rear oil seal press-fitting tool. Background Technology

[0002] In the assembly of automobile engines, the pressing of the crankshaft rear oil seal is a critical process. In the traditional process, the installation of the flywheel housing oil seal requires the use of specific tooling to manually hammer the oil seal into the flywheel housing and install it in place. Then, a guide tool is used to install the flywheel housing component with the oil seal installed onto the engine.

[0003] However, this traditional process of installing oil seals by using tooling and hammering has the following drawbacks:

[0004] (1) The direction of the hammering force is uncontrollable, which leads to uneven oil seal insertion depth and easy one-sided tilting, affecting the sealing performance;

[0005] (2) Impact and vibration can easily cause deformation or scratches on the oil seal lip, increasing the risk of oil leakage;

[0006] (3) Reliance on operational experience leads to low assembly efficiency and unstable quality;

[0007] (4) The oil seal and flywheel housing need to be assembled in advance before the whole assembly, which is a complicated process.

[0008] Therefore, there is an urgent need for a crankshaft rear oil seal press-fitting tool that can achieve precise positioning, uniform pressure application, and reduce assembly steps. Utility Model Content

[0009] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0010] Therefore, to solve the above-mentioned technical problems, this utility model provides the following technical solution: a crankshaft rear oil seal press-fitting tool, comprising:

[0011] The guide positioning module includes an oil seal guide seat that mates with the crankshaft. The oil seal guide seat is provided with a guide portion for axial positioning, and clamping bolts for screwing into the flywheel mounting screw holes are symmetrically arranged on both sides of the guide portion.

[0012] The press-fitting execution module includes a central drive shaft mechanism and a press-fitting plate threadedly connected thereto. The central drive shaft mechanism includes a main drive bolt, which is connected to an oil seal guide seat via a positive thread and to the press-fitting plate via a reverse thread.

[0013] The power input module includes a power interface located at the end of the central drive shaft mechanism for connecting a rotary drive tool.

[0014] As a preferred embodiment of the crankshaft rear oil seal press-fitting tool of this utility model, the press-fitting plate is provided with an annular pressure distribution surface for fitting with the end face of the crankshaft.

[0015] As a preferred embodiment of the crankshaft rear oil seal press-fitting tool of this utility model, the main drive bolt press-fitting section is provided with a tapered guide surface for matching with the outer edge of the oil seal.

[0016] As a preferred embodiment of the crankshaft rear oil seal press-fitting tool of this utility model, the power interface is a hexagonal head structure or an internal hexagonal sleeve interface.

[0017] As a preferred embodiment of the crankshaft rear oil seal press-fitting tool of this utility model, the pressing bolt is provided with a retaining ring groove for installing an elastic retaining ring to prevent the pressing bolt from loosening.

[0018] As a preferred embodiment of the crankshaft rear oil seal press-fitting tool of this utility model, the number of the clamping bolts is two, which are symmetrically distributed on both sides of the axial positioning guide.

[0019] The beneficial effects of this utility model are:

[0020] This invention uses double clamping bolts to fix the guide seat and combines a central screw drive mechanism to uniformly advance the oil seal, which has the following advantages:

[0021] (1) The positive and negative threads are driven in a coordinated manner to achieve uniform pressure on the pressing plate, avoiding the problem of uneven force caused by traditional hammering;

[0022] (2) The tapered guide surface guides the oil seal lip to expand naturally, preventing edge flipping or scratches, and greatly reducing the damage rate;

[0023] (3) The tool is directly fixed to the crankshaft end face, eliminating the pre-assembly process of oil seal and flywheel housing, greatly improving assembly efficiency;

[0024] (4) The annular pressure distribution surface ensures that the flatness error of the oil seal is reduced and the sealing reliability is significantly improved. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 This is a schematic diagram of the specific structure of the clamping bolt of this utility model.

[0028] Figure 3 This is a schematic diagram of the main drive bolt of this utility model.

[0029] Figure 4 This is a schematic diagram of the specific structure of the pressing disc of this utility model.

[0030] Figure 5 This is a schematic diagram of the specific structure of the oil seal guide seat of this utility model.

[0031] Figure 6 This is a top view of the oil seal guide seat of this utility model.

[0032] Figure 7 This is a top view of the oil seal guide seat of this utility model.

[0033] In the diagram: 100, guide positioning module; 101, oil seal guide seat; 1011, axial positioning guide part; 102, clamping bolt;

[0034] 200. Press-fit execution module; 201. Central drive shaft mechanism; 2011. Main drive bolt; 2011-a. Conical guide surface; 202. Press-fit plate; 2021. Annular pressure distribution surface;

[0035] 300. Power input module; 301. Power interface;

[0036] 400. Crankshaft;

[0037] 500, oil seal. Detailed Implementation

[0038] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0041] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0042] Reference Figures 1-7 This invention provides a crankshaft rear oil seal press-fitting tool, which mainly includes three functional modules: a guide positioning module 100, a press-fitting execution module 200, and a power input module 300, as detailed below:

[0043] The guide positioning module 100 includes:

[0044] Oil seal guide seat 101: The front end is provided with an axial positioning guide part 1011, which is an annular boss with a diameter matching the end face of the crankshaft 400, and the height of the boss is adapted to the pressing depth of the oil seal 500.

[0045] Two clamping bolts 102 are symmetrically threaded into the mounting holes on both sides of the positioning guide 1011. The bolt axis is parallel to the center line of the positioning guide 1011. The ends of the two clamping bolts 102 are machined with threaded sections that match the mounting screw holes of the flywheel. The shank of the clamping bolt 102 is provided with a retaining ring groove 1021 for installing an elastic retaining ring (such as an E-type retaining ring or a C-type retaining ring) to prevent the bolt from loosening and retracting due to vibration during the pressing process.

[0046] Press-fit execution module 200 includes:

[0047] The central drive shaft mechanism 201 includes a main drive bolt 2011. One end of the main drive bolt 2011 is machined with a positive thread to mate with the internal thread hole of the oil seal guide seat 101, and the other end is machined with a reverse thread to connect with the pressure plate 202.

[0048] Press plate 202: It is a disc structure with a central threaded hole. Its contact surface is provided with an annular pressure distribution surface 2021. This surface is a flat annular area that has been ground, and its width is consistent with the width of the crankshaft end face sealing groove.

[0049] Conical guide surface 2011-a: Located at the front end of the press-fit section of the main drive bolt 2011, it is a conical surface with a 45° cone angle, used to match the outer edge of the oil seal 500.

[0050] The power input module 300 includes:

[0051] Hexagonal power interface 301: Located at the end of the central drive shaft mechanism 201, it has an external hexagonal structure and can be matched with the socket of a pneumatic wrench.

[0052] The workflow and principles of this tool are as follows:

[0053] 1. Reservation stage:

[0054] The oil seal 500 is fitted onto the conical guide surface 2011-a, and the guide effect of the conical surface allows the oil seal lip to expand and be positioned naturally. At this time, the pressure plate 202 is in the retracted position, and the annular pressure distribution surface 2021 maintains a certain distance from the end face of the oil seal 400.

[0055] 2. Tool fixing stage:

[0056] The annular boss of the guide part 1011 is attached to the end face of the crankshaft 400, and the two clamping bolts 102 are tightened so that they are screwed into the flywheel mounting screw hole. By applying force symmetrically, the tool and the crankshaft 500 are kept coaxial. The elastic retaining ring is inserted into the retaining ring groove 1021 so that the bolt remains tight in the vibration environment, avoiding the bolt from loosening due to tool vibration and ensuring the stability of the press-fitting process.

[0057] 3. Pressing and fitting stage:

[0058] Connect the pneumatic wrench to the hexagonal power interface 301 to drive the central drive shaft mechanism 201 to rotate. Due to the synergistic effect of the positive and negative threads:

[0059] The positive thread causes the centrally located main drive bolt 2011 to produce a linear feed in the direction of crankshaft 500;

[0060] The reverse thread drives the pressure plate 202 to move synchronously toward the oil seal 400;

[0061] The annular pressure distribution surface 2021 makes uniform contact with the end face of the oil seal 400, and the conical guide surface 2011-a continuously guides the lip expansion of the oil seal 400.

[0062] 4. Complete the exit phase:

[0063] When the pressing plate 202 moves to contact the oil seal guide seat 101, the oil seal 400 reaches the set pressing depth. Reversing the pneumatic wrench causes the central drive shaft mechanism 201 to retract, and all parts of the tool return to their initial positions, completing the pressing operation.

[0064] This embodiment replaces impact assembly with screw drive, ensuring uniform force on the oil seal 400 during press-fitting, with a measured flatness error of ≤0.08mm, improving assembly efficiency by more than 60%, and completely avoiding the oil seal lip damage problem caused by traditional processes.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A crankshaft rear oil seal press-fitting tool, characterized in that: include: The guide positioning module (100) includes an oil seal guide seat (101) used in conjunction with the crankshaft (400). The oil seal guide seat (101) is provided with a guide part (1011) for axial positioning. On both sides of the guide part (1011) are symmetrically arranged clamping bolts (102) for screwing into the flywheel mounting screw holes. The press-fit execution module (200) includes a central drive shaft mechanism (201) and a press-fit plate (202) threadedly connected thereto. The central drive shaft mechanism (201) includes a main drive bolt (2011), which is connected to the oil seal guide seat (101) by a positive thread and to the press-fit plate (202) by a reverse thread. The power input module (300) includes a power interface (301) located at the end of the central drive shaft mechanism (201) for connecting a rotary drive tool.

2. The crankshaft rear oil seal press-fitting tool as described in claim 1, characterized in that: The press plate (202) is provided with an annular pressure distribution surface (2021) for fitting with the end face of the crankshaft (400).

3. The crankshaft rear oil seal press-fitting tool as described in claim 1, characterized in that: The main drive bolt (2011) has a tapered guide surface (2011-a) on its press-fit section for matching the outer edge of the oil seal (500).

4. The crankshaft rear oil seal press-fitting tool as described in claim 1, characterized in that: The power interface (301) is a hexagonal head structure or an internal hexagonal socket interface.

5. The crankshaft rear oil seal press-fitting tool as described in claim 1, characterized in that: The clamping bolt (102) has a retaining ring groove (1021) for installing an elastic retaining ring to prevent the clamping bolt (102) from loosening.

6. The crankshaft rear oil seal press-fitting tool as described in claim 1, characterized in that: There are two clamping bolts (102), which are symmetrically distributed on both sides of the axial positioning guide (1011).

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