Chain wheel cover assembly for a chain saw

Abstract

The utility model belongs to the technical field of garden tools, specifically discloses a chain wheel cover assembly system of chain saw for connecting chain saw body and chain wheel cover, the assembly system includes: a bolt arranged in chain saw body, the tail of bolt extends to the outside of chain saw body, the chain wheel cover can be sleeved into the bolt and is jointed on chain saw body, a nut is screwed on the bolt, the nut can provide the compression force that chain wheel cover is locked on chain saw body, a limiting piece arranged at the tail of bolt, the limiting piece is used for limiting the nut from the bolt and separates. The utility model discloses the structure of bolt, nut, shaft body and limiting piece, realizes the nut anti -drop effect, and simple structure is convenient for processing and assembly simultaneously, and it is convenient for user operation and uses.

Description

Technical Field

[0001] This utility model relates to the field of garden tool technology, and in particular to a chainsaw sprocket cover assembly system. Background Technology

[0002] A chainsaw is a widely used tool in logging and timber processing. An assembly structure exists between the sprocket cover and the chainsaw body to allow for chain replacement. Currently used assembly structures, such as the chainsaw disclosed in patent number CN220297344U, include: a housing, a saw chain for cutting, a guide plate supporting the saw chain, a first fastener fixed to the housing, a chain cover that fixes the guide plate to the housing, and a second fastener that cooperates with the first fastener to fix the chain cover to the housing. This chainsaw also includes a retaining member, which can be an elastic or flexible member. One end of the retaining member is connected to the chain cover, and the other end is connected to the second fastener, preventing the second fastener from falling off the chain cover when the first and second fasteners are disengaged. This type of structure uses a spring to prevent the nut from coming off, but it suffers from assembly difficulties and complex manufacturing processes. Utility Model Content

[0003] This invention aims to overcome the shortcomings of existing technologies by providing a sprocket cover assembly system that is easy to assemble and operate.

[0004] The present invention solves the technical problem by adopting the following technical solution: a chainsaw sprocket cover assembly system for connecting the chainsaw body and the sprocket cover, the assembly system comprising:

[0005] A bolt is disposed inside the chainsaw body, the tail of which extends to the outside of the chainsaw body. A sprocket cover can be fitted onto the bolt and engaged with the chainsaw body.

[0006] A nut screwed onto the bolt, the nut providing a clamping force to lock the sprocket cover onto the chainsaw body;

[0007] A limiting element is provided at the tail of the bolt, the limiting element being used to prevent the nut from detaching from the bolt.

[0008] In several embodiments, a bushing is also included, which is fitted onto the bolt, and the nut can abut against the bushing and abut against the sprocket cover.

[0009] In several embodiments, the nut is positioned between the limiting member and the bushing, and the nut cannot pass through the limiting member or the bushing during movement.

[0010] In several embodiments, the sprocket cover is provided with a sliding hole, the bolt passes through the sliding hole, a retaining edge is provided in the sliding hole, and the bushing is located outside the retaining edge and contacts and engages with the retaining edge.

[0011] In several embodiments, the diameter of one end of the sliding hole is larger than the diameter of the other end, and when the bolt is located at the end of the sliding hole with the larger diameter, the sprocket cover can be detached from the bolt.

[0012] In several embodiments, one side of the sliding hole has a downwardly inclined guide slope.

[0013] In several embodiments, a positioning hole is provided on the chainsaw body, and a positioning pin is provided on the sprocket cover, with the positioning pin engaging with the positioning hole.

[0014] In several embodiments, the sprocket cover is provided with a mounting groove, the mounting groove is provided with an elastic body, and the elastic body is connected to a positioning pin.

[0015] In several embodiments, a retaining ring is provided at the top of the mounting groove, and the positioning pin can partially extend to the outside of the retaining ring and be inserted into the positioning hole.

[0016] This utility model has the following beneficial effects:

[0017] This utility model achieves the nut anti-loosening effect through the structure of bolts, nuts, shafts and limiting parts. At the same time, the structure is simple, easy to process and assemble, and easy for users to operate. Attached Figure Description

[0018] The accompanying drawings described herein are for illustrative purposes only and do not represent all possible implementations, nor should they be considered as limiting the scope of this invention.

[0019] Figure 1 This is a partially exploded schematic diagram of the sprocket cover assembly system of the chainsaw in Example 1;

[0020] Figure 2 for Figure 1 Enlarged diagram of section A in the middle;

[0021] Figure 3 This is a cross-sectional schematic diagram of the sprocket cover assembly system of the chainsaw in Example 1;

[0022] Figures 4-5 This is a schematic diagram of the assembly process of the chainsaw sprocket cover assembly system in Example 1. Detailed Implementation

[0023] The embodiments of the present utility model are described in detail below. In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some embodiments of the present utility model, but not all embodiments.

[0024] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] The terminology used herein is intended to explain the embodiments and is not intended to limit and / or restrict the present invention.

[0026] Example 1

[0027] like Figures 1-3 As shown, the sprocket cover assembly system of the chainsaw in this embodiment is used to connect the chainsaw body 1 and the sprocket cover 2. It is mainly composed of a bolt 10 set in the chainsaw body 1, a nut 20 screwed on the bolt 10, a limiting member 30 set at the tail of the bolt 10, and a bushing 40 sleeved on the bolt 10. The bolt 10, nut 20 and bushing 40 are used to lock and loosen the sprocket cover 2, and the limiting member 30 is used to prevent the nut 20 from falling off.

[0028] Specifically, the tail of the bolt 10 extends to the outside of the chainsaw body 1, and the sprocket cover 2 is provided with a sliding hole 201. The bolt 10 passes through the sliding hole 201, so that the sprocket cover 2 can be fitted with the bolt 10 and engaged on the chainsaw body 1. The sliding hole 201 is along the direction of the chain plate of the chainsaw body 1, which is assumed to extend in the left and right direction. Thus, the sprocket cover 2 can move left and right in this direction.

[0029] Here, the nut 20 provides a clamping force to lock the sprocket cover 2 onto the chainsaw body 1, and the limiting member 30 is used to prevent the nut 20 from detaching from the bolt 10. The nut 20 is positioned between the limiting member 30 and the bushing 40, and the nut 20 cannot pass through the limiting member 30 or the bushing 40 during movement. By rotating the nut 20, it can abut against the bushing 40 and the bushing 40 can abut against the sprocket cover 2 to achieve locking. The limiting member 30 can be a snap ring structure sleeved on the threaded end of the bolt 10 to prevent the nut 20 from unscrewing from the bolt 10 and falling off.

[0030] A retaining edge 202 is provided protruding inward on the inner wall of the sliding hole 201. The retaining edge 202 does not completely surround the sliding hole 201 and has an opening at its left end. The bushing 40 is located outside the retaining edge 202 and contacts and engages with the retaining edge 202. The bushing 40 adopts a T-shaped structure and can abut against the retaining edge 202 to provide locking force. At the same time, in order to facilitate the movement of the sprocket cover 2, a downward inclined guide slope 203 is provided on one side of the sliding hole 201, i.e., the left side.

[0031] Meanwhile, the diameter of one end of the sliding hole 201 is larger than the diameter of the other end, that is, the diameter of the left side is larger than the diameter of the right side. Therefore, when the bolt 10 is located at the end with the larger diameter in the sliding hole 201, the sprocket cover 2 can be detached from the bolt 10. When the bolt 10 is located in other positions, the sprocket cover 2 is blocked by the bushing 40 and the nut 20 and cannot be detached from the bolt 10.

[0032] Furthermore, this embodiment also provides a positioning connection structure, mainly composed of a positioning hole 101, a positioning pin 50, an elastic body 60, and a retaining ring 70. The positioning hole 101 is provided on the chainsaw body 1, and a mounting groove 211 is provided inside the sprocket cover 2. The elastic body 60 is hidden in the mounting groove 211, and a spring can be used here. The end of the elastic body 60 is connected to the positioning pin 50, so that the positioning pin 50 can move in the mounting groove 211. At the same time, the retaining ring 70 is provided at the top of the mounting groove 211, and the positioning pin 50 can partially protrude to the outside of the retaining ring 70 and be inserted into the positioning hole 101. The structure of the retaining ring 70 improves the stability of the movement of the positioning pin 50.

[0033] Meanwhile, the positioning pin 50 protrudes outward from the side to form a wrench body 100, which is exposed outside the sprocket cover 2. An opening is provided on the sprocket cover 2 for the wrench body 100 to move up and down.

[0034] Combination Figures 4-5 As shown, when the chain needs to be replaced, loosen the nut 20, pull the wrench body 100 upward so that the positioning pin 50 disengages from the positioning hole 101 under the elastic force of the elastic body 60, then move the sprocket cover 2 to the right to the limit position, and lift the sprocket cover 2 upward to replace the chain; when the replacement is completed and locking is required, move the sprocket cover 2 to the left to the limit position, press down the sprocket cover 2 so that the positioning pin 50 enters the positioning hole 101, and then tighten the nut 20 to complete the locking.

[0035] The examples, embodiments, and special forms of this utility model have been shown and described in detail in the accompanying drawings and foregoing description, and should also be considered illustrative rather than restrictive. The description of a particular feature in one embodiment does not imply that those particular features must be limited to that one embodiment. Features of one embodiment can be used in combination with features of other embodiments, as will be understood by those skilled in the art, whether explicitly stated or not. Exemplary embodiments have been shown and described, and all variations and modifications fall within the spirit of this utility model and are intended to be protected.

Claims

1. A chainsaw sprocket cover assembly system for connecting the chainsaw body (1) and the sprocket cover (2), characterized in that, The assembly system includes: A bolt (10) is disposed inside the chainsaw body (1), the tail of the bolt (10) extending to the outside of the chainsaw body (1), and the sprocket cover (2) can be fitted into the bolt (10) and engaged with the chainsaw body (1). A nut (20) screwed onto the bolt (10) provides a clamping force to lock the sprocket cover (2) onto the chainsaw body (1); A limiting member (30) is provided at the tail of the bolt (10) to prevent the nut (20) from disengaging from the bolt (10).

2. A chain saw sprocket cover assembly as defined in claim 1 wherein, It also includes a bushing (40) which is fitted onto the bolt (10), and the nut (20) can abut against the bushing (40) and abut against the sprocket cover (2).

3. The chainsaw sprocket cover assembly system according to claim 2, characterized in that, The nut (20) is positioned between the limiting member (30) and the bushing (40), and the nut (20) cannot pass through the limiting member (30) or the bushing (40) during movement.

4. The chainsaw sprocket cover assembly system according to claim 2, characterized in that, The sprocket cover (2) is provided with a sliding hole (201), the bolt (10) passes through the sliding hole (201), a retaining edge (202) is provided in the sliding hole (201), and the bushing (40) is located outside the retaining edge (202) and contacts and cooperates with the retaining edge (202).

5. A chainsaw sprocket cover assembly system according to claim 4, characterized in that, When the diameter of one end of the sliding hole (201) is larger than the diameter of the other end, and the bolt (10) is located at the end of the sliding hole (201) with the larger diameter, the sprocket cover (2) can be detached from the bolt (10).

6. A chainsaw sprocket cover assembly system according to claim 4, characterized in that, The sliding hole (201) has a downwardly inclined guide slope (203) on one side.

7. A chainsaw sprocket cover assembly system according to claim 1, characterized in that, The chainsaw body (1) is provided with a positioning hole (101), and the sprocket cover (2) is provided with a positioning pin (50), which is inserted into the positioning hole (101).

8. A chainsaw sprocket cover assembly system according to claim 7, characterized in that, The sprocket cover (2) is provided with a mounting groove (211), and an elastic body (60) is provided in the mounting groove (211). The elastic body (60) is connected to the positioning pin (50).

9. A chainsaw sprocket cover assembly system according to claim 8, characterized in that, A retaining ring (70) is provided at the top of the mounting groove (211), and the positioning pin (50) can partially extend to the outside of the retaining ring (70) and be inserted into the positioning hole (101).

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