A gear assembly positioning structure

Abstract

The utility model discloses a gear assembly positioning structure, include: elastic split pin, the elastic split pin can take place elastic deformation, first idler gear, first idler gear include first idler gear axle and first idler gear body, first idler gear body installs on first idler gear axle, first idler gear axle is used for supporting first idler gear body, be equipped with the first idler gear axle pin hole that matches with the elastic split pin on first idler gear axle, a plurality of second idler gears, second idler gear includes second idler gear body and second idler gear axle, idler gear support, idler gear support is used for installing first idler gear and a plurality of second idler gears, be equipped with the idler gear support pin hole that can accommodate the elastic split pin on idler gear support, cylinder cover, be equipped with the cylinder cover pin hole that matches with elastic split pin on cylinder cover, and first idler gear can be positioned on cylinder cover through elastic split pin.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine technology, and in particular to a gear assembly positioning structure. Background Technology

[0002] An engine idler gear is a gear that acts as a transmission link between two non-contacting transmission gears. It changes the rotation direction of the driven gear to match that of the driving gear, altering only the direction of rotation and not the transmission ratio. The idler gear serves two main functions: changing the direction of rotation and adjusting the spatial arrangement of the engine's overall gear system. For gear trains with long transmission distances, a single idler gear assembly requires a large pitch circle diameter to change the rotation direction and connect the space, resulting in a large space occupation on the end face, which is often difficult to implement. By designing multiple idler gear assemblies for transmission, the pitch circle diameter of the idler gear assembly can be reduced, enabling transmission within narrow passages.

[0003] In existing technologies, such as Figure 5 As shown, the idler gear shaft is fixedly connected to both the idler gear bracket and the cylinder head. The end face of the idler gear shaft rests on the cylinder head. Since the cylinder head and cylinder block are not integral parts, their front faces are not coplanar after assembly. When the idler gear bracket is press-fitted into the cylinder head and cylinder block, there is a misalignment between the idler gear shaft and the positioning holes in the cylinder head and cylinder block, leading to over-alignment. During engine operation, the combined effects of cylinder head gasket elastic deformation and cylinder head thermal expansion displacement create a potential risk of cylinder head cracking on the front face of the cylinder head.

[0004] 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

[0005] The purpose of this invention is to provide a gear assembly positioning structure that can ensure the positioning and stability of the idler gear.

[0006] To achieve the above objectives, this utility model provides a gear assembly positioning structure, comprising: an elastic cotter pin capable of elastic deformation; a first idler gear, the first idler gear including a first idler gear shaft and a first idler gear body, the first idler gear body being mounted on the first idler gear shaft, the first idler gear shaft supporting the first idler gear body, the first idler gear shaft having a first idler gear shaft pin hole matching the elastic cotter pin; a plurality of second idler gears, the second idler gear including a second idler gear body and a second idler gear shaft; an idler gear bracket for mounting the first idler gear and the plurality of second idler gears, the idler gear bracket having an idler gear bracket pin hole capable of accommodating the elastic cotter pin; and a cylinder head, the cylinder head having a cylinder head pin hole matching the elastic cotter pin, the first idler gear being able to be positioned on the cylinder head by the elastic cotter pin.

[0007] In one or more embodiments, the first idler gear can be fixed to the idler gear bracket by a plurality of first idler gear bolts, the idler gear bracket being provided with a plurality of first idler gear bolt holes that match the first idler gear bolts.

[0008] In one or more embodiments, the idler gear bracket is provided with a plurality of cylinder block bolts and a plurality of cylinder head bolts; the cylinder block bolts can engage with the cylinder block bolt holes on the cylinder block to achieve a fixed connection between the idler gear bracket and the cylinder block, and the cylinder head bolts can engage with the cylinder head bolt holes on the cylinder head to achieve a fixed connection between the idler gear bracket and the cylinder head.

[0009] In one or more embodiments, the idler gear bracket is further provided with a plurality of second idler gear bolt holes, and the second idler gear can be fixedly connected to the idler gear bracket by means of second idler gear bolts.

[0010] In one or more embodiments, the first idler gear shaft pin hole is located at the axis of the first idler gear shaft, and a plurality of first idler gear shaft bolt holes are arranged around the first idler gear shaft pin hole.

[0011] This invention provides a gear assembly positioning structure. The first idler gear shaft is individually fastened and positioned on the idler gear bracket. The bearing surface is between the first idler gear shaft and the idler gear bracket, ensuring the idler gear is fixed while preventing the cylinder head from being subjected to excessive tensile, compressive, and bending forces, which could lead to potential cracks on the cylinder head's front end face. A flexible cotter pin is used for positioning between the first idler gear shaft and the cylinder head, both positioning the idler gear assembly and providing a certain degree of elastic movement. This ensures the clearance between the idler gear assembly and the driving and driven gears, while also eliminating thermal expansion of the cylinder head and cylinder head gasket deformation during engine operation. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a gear assembly positioning structure provided in an embodiment of this utility model.

[0013] Figure 2 This is an exploded view of a gear assembly positioning structure provided in an embodiment of this utility model.

[0014] Figure 3 This is a cylinder head structure diagram of a gear assembly positioning structure provided in an embodiment of this utility model.

[0015] Figure 4 This is a structural diagram of a gear assembly positioning structure provided in an embodiment of this utility model.

[0016] Figure 5 This is a cross-sectional view of a prior art gear assembly positioning structure provided in this embodiment of the present utility model.

[0017] Explanation of key figure labels:

[0018] 1-Elastic cotter pin, 2-First idler gear, 21-First idler gear shaft, 211-First idler gear pin hole, 22-First idler gear body, 23-First idler gear bolt, 3-Second idler gear, 31-Second idler gear shaft, 32-Second idler gear body, 4-Idler gear bracket, 41-Idler gear bracket pin hole, 42-First idler gear bolt hole, 43-Cylinder block bolt, 44-Cylinder head bolt, 45-Second idler gear bolt hole, 5-Cylinder head, 51-Cylinder head pin hole, 6-Cylinder block. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, it should be understood that the scope of protection of this utility model is not limited to the specific embodiments.

[0020] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0021] A gear assembly positioning structure, such as Figures 1 to 4As shown, the system includes: a resilient cotter pin 1 capable of elastic deformation; a first idler gear 2, comprising a first idler gear shaft 21 and a first idler gear body 22, the first idler gear body 22 being mounted on the first idler gear shaft 21, the first idler gear shaft 21 supporting the first idler gear body 22, and a first idler gear shaft 21 pin hole matching the resilient cotter pin 1; a plurality of second idler gears 3, each comprising a second idler gear body 32 and a second idler gear shaft 31; an idler gear bracket 4, for mounting the first idler gear 2 and the plurality of second idler gears 3, the idler gear bracket 4 having an idler gear bracket 4 pin hole capable of accommodating the resilient cotter pin 1; and a cylinder head 5, the cylinder head 5 having a cylinder head pin hole 51 matching the resilient cotter pin 1, the first idler gear 2 being positioned on the cylinder head 5 via the resilient cotter pin 1.

[0022] Specifically, in use, the elastic cotter pin 1 is matched and positioned with the first idler gear pin hole 211. First, the elastic cotter pin 1 is installed on the first idler gear shaft 21. Then, the first idler gear 2, the second idler gear 3, and the idler gear bracket 4 are assembled onto the cylinder head 5 and the cylinder block 6. The first idler gear 2 is positioned by the elastic cotter pin 1 with the cylinder head pin hole 51, and the idler gear bracket 4 is matched with the cylinder head 5. Specifically, there are multiple second idler gears 3. The first idler gear 2 and multiple second idler gears 3 mesh sequentially for transmission. The first idler gear body 22 is fixed on the first idler gear shaft 21. The first idler gear shaft 21 and the cylinder head 5 are fixed by the elastic cotter pin 1, which can both position the first idler gear 2 and the second idler gear 3 in the gear assembly and has a certain elastic movement function, which can eliminate the thermal expansion of the cylinder head and the deformation of the cylinder head gasket during engine operation.

[0023] Ensure the clearance between the idler gear assembly and the driving and driven gears, while also counteracting elastic deformation and displacement during engine operation.

[0024] As an optional implementation, the first idler gear 2 can be fixed to the idler gear bracket 4 by a plurality of first idler gear bolts 23, and the idler gear bracket 4 is provided with a plurality of first idler gear bolt holes 42 that match the first idler gear bolts 23.

[0025] Specifically, the first idler gear 2 may be provided with a plurality of first idler gear bolt holes 42 for accommodating the first idler gear bolts 23. The first idler gear bolts 23 pass through the first idler gear 2 and the idler gear bracket 4 in sequence, thereby realizing the connection between the first idler gear 2 and the idler gear bracket 4.

[0026] As an optional implementation, the idler gear bracket 4 is provided with a plurality of cylinder block bolts 43 and a plurality of cylinder head bolts 44; the cylinder block bolts 43 can engage with the cylinder block bolt 43 holes on the cylinder block 6 to achieve a fixed connection between the idler gear bracket 4 and the cylinder block 6, and the cylinder head bolts 44 can engage with the cylinder head bolt 44 holes on the cylinder head 5 to achieve a fixed connection between the idler gear bracket 4 and the cylinder head 5.

[0027] Specifically, in a preferred embodiment, there are two cylinder block bolts 43 and two cylinder head bolts 44, which respectively fix the four corners of the idler gear bracket 4. This two-point connection enhances the stability of the connection between the idler gear bracket 4 and the cylinder block 6 and cylinder head 5.

[0028] As an optional implementation, the idler gear bracket 4 is also provided with a plurality of second idler gear bolt holes 45, and the second idler gear 3 can be fixedly connected to the idler gear bracket 4 by means of second idler gear 3 bolts.

[0029] Specifically, in a preferred embodiment, there are two second idler gears 3, with the first idler gear 2 connected sequentially to the two second idler gears 3. Bolts on the second idler gears 3 pass through both the second idler gear 3 and the bolts on the idler gear support 4 to connect the second idler gear 3 to the idler gear support 4.

[0030] As an optional implementation, the pin hole of the first idler gear shaft 21 is located at the axis of the first idler gear shaft 21, and a plurality of bolt holes of the first idler gear shaft 21 are arranged around the pin hole of the first idler gear shaft 21.

[0031] Specifically, in a preferred embodiment, the plurality of bolt holes of the first idler gear shaft 21 are centrally symmetrically arranged on the first idler gear shaft 21 with the first idler gear pin hole 211 as the center, so that the tension of the first idler gear shaft 21 is balanced and not easily deformed.

[0032] By adopting the above technical solution, a gear assembly positioning structure is provided. The first idler gear shaft 21 is individually fastened and positioned on the idler gear bracket 4. The bearing surface is between the first idler gear shaft 21 and the idler gear bracket 4, which can ensure the fixation of the idler gear and at the same time avoid the cylinder head 5 from being subjected to large tensile, compressive and bending forces, which could lead to the potential for cracks on the front end face of the cylinder head. The first idler gear shaft 21 and the cylinder head 5 are positioned by a flexible cotter pin 1, which not only positions the idler gear assembly but also has a certain elastic movement function, which can ensure the clearance between the idler gear assembly and the driving gear and driven gear, while eliminating the thermal expansion of the cylinder head and the deformation of the cylinder head gasket during engine operation.

[0033] 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 gear assembly positioning structure, characterized in that, include: A resilient cotter pin, wherein the resilient cotter pin is capable of elastic deformation; The first idler gear includes a first idler gear shaft and a first idler gear body. The first idler gear body is mounted on the first idler gear shaft, and the first idler gear shaft is used to support the first idler gear body. The first idler gear shaft is provided with a first idler gear shaft pin hole that matches the elastic cotter pin. Multiple second idler gears, each second idler gear comprising a second idler gear body and a second idler gear shaft; An idler gear bracket is provided for mounting the first idler gear and a plurality of second idler gears, and the idler gear bracket is provided with an idler gear bracket pin hole that can accommodate the resilient cotter pin. The cylinder head has a cylinder head pin hole that matches the elastic cotter pin, and the first idler gear can be positioned on the cylinder head by the elastic cotter pin.

2. The gear assembly positioning structure as described in claim 1, characterized in that, The first idler gear can be fixed to the idler gear bracket by a plurality of first idler gear bolts, and the idler gear bracket is provided with a plurality of first idler gear bolt holes that match the first idler gear bolts.

3. The gear assembly positioning structure as described in claim 1, characterized in that, The idler gear bracket is provided with a plurality of cylinder block bolts and a plurality of cylinder head bolts; the cylinder block bolts can mate with the cylinder block bolt holes on the cylinder block to achieve a fixed connection between the idler gear bracket and the cylinder block, and the cylinder head bolts can mate with the cylinder head bolt holes on the cylinder head to achieve a fixed connection between the idler gear bracket and the cylinder head.

4. The gear assembly positioning structure as described in claim 1, characterized in that, The idler gear bracket is also provided with a plurality of second idler gear bolt holes, and the second idler gear can be fixedly connected to the idler gear bracket by means of second idler gear bolts.

5. The gear assembly positioning structure as described in claim 1, characterized in that, The first idler gear shaft pin hole is located at the axis of the first idler gear shaft, and a plurality of first idler gear shaft bolt holes are arranged around the first idler gear shaft pin hole.

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