A double-lip crankshaft oil seal special installation tool with split guide cone

Abstract

The utility model discloses a special installation tool of double -lipped mouth crankshaft oil seal with split type guide cone, include: intermediate piece: the intermediate piece includes fixed disc and first screw, first screw one end is screwed and is fixed on the crankshaft, and the other end is fixed on fixed disc, the rail piece: the rail piece includes guide cone and second screw, second screw is long nail structure, second screw one end passes into fixed disc, and the other end is fixed with guide cone, and extends through guide cone, functional piece: functional piece includes knob and pressure head, knob and pressure head swing joint in second screw passes through the section of guide cone extension, the distance of knob to fixed disc is greater than the distance of pressure head to fixed disc, knob with pressure head is connected, and knob is used for limiting the distance of pressure head to fixed disc. The utility model can realize the effect that avoids guide cone screw hole to destroy its surface for guiding oil seal installation, and improves installation success rate and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of engine assembly, and in particular to a special installation tool for a double-lip crankshaft oil seal with a split guide cone. Background Technology

[0002] As an elastic sealing element, the crankshaft oil seal's inner diameter must be smaller than the journal's outer diameter to achieve an interference fit, thus forming a reliable sealing interface. In traditional assembly processes, a guide cone tool is required to achieve a gradual expansion installation of the oil seal, specifically as follows:

[0003] 1. The guide cone is fixed to the crankshaft end face, and the oil seal is advanced along the cone axial direction;

[0004] 2. As the oil seal displacement increases, the radial dimension gradient of the cone increases, forcing the inner diameter of the oil seal to undergo elastic deformation;

[0005] 3. Finally, the oil seal reaches the journal mounting position to complete the sealing surface fit.

[0006] In applications involving small-displacement engines, traditional integrated guide cones present significant technical challenges:

[0007] 1. Structural conflict: Due to the size limitation of the journal, the mounting bolt holes of the crankshaft flywheel need to be arranged at the edge, which means that the guide cone must be provided with bolt through holes;

[0008] 2. Functional defects: The conical notch formed by the through hole will cause the following problems:

[0009] The sharp angle of the notch edge causes mechanical damage to the oil seal lip when it passes through.

[0010] Due to its complex structure, double-lip oil seals cannot pass through discontinuous conical surfaces.

[0011] 3. Reliability risk: Stress concentration at the notch can easily lead to structural failure of the guide cone.

[0012] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0013] The purpose of this invention is to provide a special installation tool for a double-lip crankshaft oil seal with a split guide cone, which can solve the problems existing in the background technology.

[0014] To achieve the above objectives, this utility model provides a special installation tool for a double-lip crankshaft oil seal with a split guide cone, comprising: an intermediate component: the intermediate component includes a fixed plate and a first screw, one end of the first screw being screwed and fixed to the crankshaft, and the other end being fixed to the fixed plate; a guide component: the guide component includes a guide cone and a second screw, the second screw being a long screw structure, one end of the second screw penetrating the fixed plate, the other end being fixed to the guide cone and extending through the guide cone; and a functional component: the functional component includes a knob and a pressure head, the knob and the pressure head being movably connected to a section of the second screw extending through the guide cone, the distance from the knob to the fixed plate being greater than the distance from the pressure head to the fixed plate, the knob being connected to the pressure head, and the knob being used to limit the distance from the pressure head to the fixed plate.

[0015] In one or more embodiments, the second screw further includes a nut, which is circumferentially fixed to the body of the second screw. The nut is positioned on the second screw between the fixing plate and the pressure head, and the nut abuts against one side of the fixing plate.

[0016] In one or more embodiments, the guide cone has a frustum structure, and the cross-sectional diameter of the guide cone increases along the installation direction of the oil seal.

[0017] In one or more embodiments, the pressure head has a barrel-shaped structure, the second screw passes through the center of the bottom surface of the pressure head, the semi-open end of the pressure head faces the installation direction of the oil seal, and the inner diameter of the annular sidewall of the barrel-shaped structure of the pressure head is equal to the maximum diameter of the guide cone.

[0018] In one or more embodiments, the fixing disk has a flat cylindrical structure, and the outer edges of the upper and lower bottoms of the fixing disk are recessed to form an annular recessed space.

[0019] In one or more embodiments, the guide cone is provided with a connecting portion that matches the shape of the recessed space, and the connecting portion is connected to the recessed space to prevent the connecting portion from shifting laterally.

[0020] Compared with the prior art, the various technical solutions and embodiments provided by this utility model include at least the following technical effects or advantages:

[0021] By setting an intermediate component and passing a second screw through its center, the intermediate component, the guide rail component, and the functional component are connected in series, avoiding the problem of functional damage caused by the connecting screw on the inclined side of the guide cone; the oil seal is installed efficiently by pushing with a pressure head. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are intended to explain the invention. They are intended to be seen as illustrative of various combinations of preferred embodiments and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of a special installation tool for a double-lip crankshaft oil seal with a split guide cone provided by this utility model in the initial installation state;

[0024] Figure 2 A schematic diagram of the overall structure of the special installation tool for a double-lip crankshaft oil seal with a split guide cone provided by this utility model in the installation state;

[0025] The numbers in the diagram represent: 11-first screw, 12-fixed disc, 21-guide cone, 22-second screw, 31-pressure head, 32-knob, 4-oil seal, 5-crankshaft. Detailed Implementation

[0026] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises", "made for", etc., shall be understood to include the stated elements or components, without excluding other elements or other components.

[0027] The purpose of this utility model is to provide a special installation tool for a double-lip crankshaft oil seal with a split guide cone, so as to avoid damaging the surface of the guide cone 21 used to guide the installation of the oil seal 4 by opening the screw, and to improve the success rate and efficiency of installation.

[0028] Example 1:

[0029] This embodiment provides a special installation tool for a double-lip crankshaft oil seal with a split guide cone, comprising: an intermediate component: the intermediate component includes a fixed plate 12 and a first screw 11, one end of the first screw 11 is screwed and fixed to the crankshaft 5, and the other end is fixed to the fixed plate 12; a guide component: the guide component includes a guide cone 21 and a second screw 22, the second screw 22 is a long nail structure, one end of the second screw 22 passes through the fixed plate 12, the other end is fixed to the guide cone 21, and extends through the guide cone 21; a functional component: the functional component includes a knob 32 and a pressure head 31, the knob 32 and the pressure head 31 are movably connected to a section of the second screw 22 extending through the guide cone 21, the distance from the knob 32 to the fixed plate 12 is greater than the distance from the pressure head 31 to the fixed plate 12, the knob 32 is connected to the pressure head 31, and the knob 32 is used to limit the distance from the pressure head 31 to the fixed plate 12.

[0030] Specifically, to avoid damaging the surface of the guide cone 21 used for guiding the installation of the oil seal 4 by drilling holes in the guide cone 21, and to improve the success rate and efficiency of installation, this embodiment provides a novel oil seal 4 installation tool that does not involve drilling through the conical surface of the guide cone 21. The fixing plate 12 is fixed to the crankshaft 5 during oil seal 4 installation and is pushed along the predetermined track of the guide plate to the required installation position by a functional component. The fixing plate 12 is positioned between the crankshaft 5 and the guide cone 21, connecting the two. Its purpose is to serve as an intermediate structure, replacing the guide cone 21 in connecting the crankshaft 5, and is fixed to the guide cone 21 by its adjacent position, avoiding the possibility of penetrating the side surface of the guide cone 21, thus preventing damage to its surface flatness or puncturing the oil seal 4.

[0031] The second screw 22 connects the intermediate component, the guide component, and the functional component, providing a track on which multiple devices can move along the screw for linkage. The oil seal 4 is an elastic ring structure with an initial installation diameter smaller than the maximum diameter of the guide cone 21. It is fitted onto the guide cone 21. As the knob 32 rotates, it drives the pressure head 31 to move in the installation direction. The pressure head 31 pushes the oil seal 4. As the oil seal 4 is driven to move along the guide cone 21, its diameter increases. It is then tightly pressed against the crankshaft 5 through an interference fit until the pressure head 31 pushes it into the predetermined installation position, achieving quick installation.

[0032] In a preferred embodiment of this invention, the second screw 22 further includes a nut, which is circumferentially fixed to the body of the second screw 22. The nut is positioned between the fixing plate 12 and the pressure head 31 on the second screw 22, and the nut abuts against one side of the fixing plate 12.

[0033] Specifically, the nut is used to tighten the intermediate component and the guide rail component, providing better fixing strength.

[0034] In a preferred embodiment of this invention, the guide cone 21 is a frustum structure, and the cross-sectional diameter of the guide cone 21 increases along the installation direction of the oil seal 4.

[0035] In a preferred embodiment of this invention, the pressure head 31 has a barrel-shaped structure, the second screw 22 passes through the center of the bottom surface of the pressure head 31, the semi-open end of the pressure head 31 faces the installation direction of the oil seal 4, and the inner diameter of the annular sidewall of the barrel-shaped structure of the pressure head 31 is equal to the maximum diameter of the guide cone 21.

[0036] Specifically, in the existing oil seal 4 mounting structure, the screw passes through the side section of the guide cone 21, thus disrupting its surface arc structure. Furthermore, if the screw length is inappropriate, it may exceed the cross section of the guide cone 21, potentially disrupting the normal movement path of the oil seal 4 during movement and scratching it. Therefore, in this embodiment, the second screw 22 also passes through the center of the guide cone 21 to avoid the impact caused by passing through its side section.

[0037] In a preferred embodiment of this invention, the fixing disk 12 has a flat cylindrical structure, and the outer edges of the upper and lower bottoms of the fixing disk 12 are recessed to form an annular recessed space.

[0038] In a preferred embodiment of this invention, the guide cone 21 is provided with a connecting portion that matches the shape of the recessed space. The connecting portion is connected to the recessed space to prevent lateral displacement of the connecting portion.

[0039] Specifically, the second screw 22 provides fixing strength in the longitudinal direction, and the recessed space is positioned in the lateral direction to prevent the components from shifting and to provide lateral fixing strength.

[0040] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A special installation tool for a double-lip crankshaft oil seal with a split-type guide cone, characterized in that, include: Intermediate component: The intermediate component includes a fixed plate and a first screw, one end of the first screw is screwed and fixed on the crankshaft, and the other end is fixed on the fixed plate; Track fixing component: The track fixing component includes a guide cone and a second screw. The second screw is a long nail structure. One end of the second screw is inserted into the fixing plate, and the other end is fixed to the guide cone and extends through the guide cone. Functional component: The functional component includes a knob and a pressure head, the knob and the pressure head being movably connected to a section of the second screw extending through the guide cone, the distance from the knob to the fixed plate being greater than the distance from the pressure head to the fixed plate, the knob being connected to the pressure head, and the knob being used to limit the distance from the pressure head to the fixed plate.

2. The special installation tool for a double-lip crankshaft oil seal with a split guide cone as described in claim 1, characterized in that: The second screw also includes a nut, which is circumferentially fixed to the body of the second screw. The nut is positioned on the second screw between the fixed plate and the pressure head, and the nut abuts against one side of the fixed plate.

3. The special installation tool for a double-lip crankshaft oil seal with a split guide cone as described in claim 2, characterized in that, The guide cone has a frustum structure, and the cross-sectional diameter of the guide cone increases along the installation direction of the oil seal.

4. The special installation tool for a double-lip crankshaft oil seal with a split guide cone as described in claim 3, characterized in that, The pressure head has a barrel-shaped structure, the second screw passes through the center of the bottom surface of the pressure head, the semi-open end of the pressure head faces the installation direction of the oil seal, and the inner diameter of the annular sidewall of the barrel-shaped structure of the pressure head is equal to the maximum diameter of the guide cone.

5. A special installation tool for a double-lip crankshaft oil seal with a split guide cone as described in claim 4, characterized in that, The fixing disk has a flat cylindrical structure, and the outer edges of the upper and lower bottoms of the fixing disk are recessed to form an annular recessed space.

6. The special installation tool for a double-lip crankshaft oil seal with a split guide cone as described in claim 5, characterized in that, The guide cone is provided with a connecting part that matches the shape of the recessed space. The connecting part is connected to the recessed space to prevent the connecting part from shifting laterally.

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