Oil duct assembly of rocker arm shaft
By setting oil passages and bolt connections on the cylinder head and rocker arm shaft, the structure of the rocker arm shaft oil passage assembly is simplified, solving the problems of numerous parts and difficult installation in the existing technology, and achieving cost reduction and improved installation efficiency.
Patent Information
- Application Number
- CN202423261526.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing rocker arm shaft oil passage assemblies require the design of complex oil passages and additional components, resulting in high costs and difficult installation.
The structure adopts a cylinder head, rocker arm shaft and rocker arm shaft mounting base. By setting oil passages and bolt connections on the cylinder head and rocker arm shaft, the oil path is simplified and complex oil passage connection parts are eliminated.
It simplifies the oil path, reduces the number of parts, lowers production costs and installation difficulty, and prevents impurities from entering the rocker arm.
Smart Images
Figure CN223536419U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engine technology, and specifically relates to a rocker arm shaft oil passage assembly. Background Technology
[0002] Engine valves are typically driven by rocker arms, which are mounted on a rocker arm shaft. The rocker arm's front end usually has a foot-like structure that contacts the valve bridge, and the valves also contact the valve bridge. The rocker arm is driven by the camshaft to rotate around the rocker arm shaft, thereby driving the valve bridge and ultimately the valves. Generally, the rocker arm's rotation around its shaft requires lubrication, and the foot-like structure at the front end also needs lubrication. Engine oil is typically introduced from the engine's cylinder head main oil passage into the rocker arm shaft and then into the rocker arm. Existing rocker arm shaft oil passage assemblies require complex oil passage designs and additional components to introduce oil from the cylinder head main oil passage into the rocker arm. Summary of the Invention
[0003] The purpose of this invention is to provide a rocker arm shaft oil passage assembly that simplifies the oil path, reduces the number of parts, and lowers costs.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a rocker arm shaft oil passage assembly, which includes a cylinder head and a rocker arm shaft mounted on the cylinder head. The cylinder head has a first mounting surface, and a first oil passage is formed on the first mounting surface. A second oil passage is formed on the rocker arm shaft. The assembly further includes a rocker arm shaft mounting seat fixedly mounted on the first mounting surface. A third oil passage is formed on the rocker arm shaft mounting seat, connecting the first oil passage and the second oil passage. The rocker arm shaft, the rocker arm shaft mounting seat, and the cylinder head are fixedly connected by a first bolt that passes through the rocker arm shaft and the rocker arm shaft mounting seat and is threaded to the cylinder head.
[0005] In another embodiment, the rocker arm shaft is provided with a first mounting hole, and the first bolt passes through the first mounting hole and is threadedly fixed to the cylinder head. The third oil passage includes a vertical hole extending in the vertical direction within the rocker arm shaft mounting seat and a horizontal groove connecting the first mounting hole and the vertical hole. Utilizing the regular vertical hole and the horizontal groove to form the third oil passage reduces machining difficulty, and using the first mounting hole as part of the oil passage further simplifies the structure, improves installation efficiency, and reduces production costs.
[0006] In another embodiment, the rocker arm shaft mounting base is provided with a second mounting hole. The first bolt passes through the first mounting hole and the second mounting hole and is threadedly fixed to the cylinder head. One end of the horizontal groove communicates with the upper end of the vertical hole, and the other end communicates with the upper end of the second mounting hole. The horizontal groove extending to the second mounting hole also reduces the installation difficulty of the rocker arm mounting base.
[0007] In another embodiment, a gap is formed between the inner wall of the lower end of the first mounting hole and the first bolt, and the gap connects the third oil passage and the second oil passage.
[0008] In another embodiment, an annular oil groove is formed on the upper end of the gap, surrounding the first bolt, and the oil groove and the gap below it connect the third oil passage and the second oil passage.
[0009] In another embodiment, the lower end of the gap is funnel-shaped, narrower at the top and wider at the bottom. An oil storage space is formed at the junction of the first mounting hole and the second mounting hole, which can buffer oil pressure to form a low-pressure zone, facilitating the storage of any impurities that may appear and preventing impurities from entering the rocker arm.
[0010] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: the oil circuit on the cylinder head and the rocker arm shaft is connected by an independent rocker arm shaft mounting seat, which eliminates the need for complex oil circuit connection parts, making the structure more streamlined and reducing the number of parts, production costs and installation difficulty. Attached Figure Description
[0011] Figure 1 This is a top view of the present invention;
[0012] Figure 2 for Figure 1 Mid-section view BB;
[0013] Figure 3 for Figure 2 A partial view at point A in the middle;
[0014] Figure 4 A perspective view of the rocker arm shaft mounting bracket. Detailed Implementation
[0015] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.
[0016] See appendix Figure 1-4 As shown, the rocker arm shaft oil passage assembly includes a cylinder head 3 and a rocker arm shaft 2 mounted on the cylinder head 3.
[0017] Specifically: the cylinder head 3 has a first mounting surface 31, on which a first oil passage 32 is formed; the rocker arm shaft 2 has a second oil passage 21; the assembly also includes a rocker arm shaft mounting seat 1 fixedly mounted on the first mounting surface 31; the rocker arm shaft mounting seat 1 has a third oil passage 11 connecting the first oil passage 32 and the second oil passage 21; the rocker arm shaft 2, the rocker arm shaft mounting seat 1, and the cylinder head 3 are fixedly connected by a first bolt 4 passing through the rocker arm shaft 2 and the rocker arm shaft mounting seat 1 and threadedly connected to the cylinder head 3. The rocker arm shaft 2 has a first mounting hole 22; the first bolt 4 passes through the first mounting hole 22 and is threadedly fixedly connected to the cylinder head 3; the third oil passage 11 includes a vertical hole 12 extending vertically within the rocker arm shaft mounting seat 1 and a horizontal groove 13 connecting the first mounting hole 22 and the vertical hole 12. The third oil passage 11 is formed by utilizing the regular vertical hole 12 and the horizontal groove 13, which reduces the processing difficulty. Furthermore, the first mounting hole 22 is used as part of the oil passage, further simplifying the structure, improving installation efficiency, and reducing production costs. The rocker arm shaft mounting base 1 has a second mounting hole 14. The first bolt 4 passes through the first mounting hole 22 and the second mounting hole 14 and is threadedly fixed to the cylinder head 3. One end of the horizontal groove 13 communicates with the upper end of the vertical hole 12, and the other end communicates with the upper end of the second mounting hole 14. The extension of the horizontal groove 13 to the second mounting hole 14 also reduces the installation difficulty of the rocker arm mounting base. A gap 24 is formed between the inner wall of the lower end of the first mounting hole 22 and the first bolt 4, and the gap 24 connects the third oil passage 11 and the second oil passage 21. An annular oil groove 25 is formed on the upper end of the gap 24, surrounding the first bolt 4. The oil groove 25 and the gap 24 below it connect the third oil passage 11 and the second oil passage 21. The lower end of the gap 24 is flared, narrower at the top and wider at the bottom. An oil storage space is formed at the junction of the first mounting hole 22 and the second mounting hole 14, which can buffer the oil pressure to form a low-pressure area, making it easy to store any impurities that may appear and preventing impurities from entering the rocker arm.
[0018] The principle of this utility model is: the first oil passage 32 on the cylinder head 3 and the second oil passage 21 on the rocker arm shaft 2 are connected by the third oil passage 11 set in the independent rocker arm shaft mounting seat 1, and part of the second oil passage 21 is formed in the first mounting hole 22, which eliminates the need for complex oil passage connection parts, making the structure more streamlined and reducing the number of parts, production costs and installation difficulty.
[0019] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A rocker arm shaft oil passage assembly, comprising a cylinder head and a rocker arm shaft mounted on the cylinder head, the cylinder head having a first mounting surface, a first oil passage formed on the first mounting surface, and a second oil passage formed on the rocker arm shaft, characterized in that: The assembly further includes a rocker arm shaft mounting seat fixedly mounted on the first mounting surface. The rocker arm shaft mounting seat has a third oil passage connecting the first oil passage and the second oil passage. The rocker arm shaft, the rocker arm shaft mounting seat, and the cylinder head are fixedly connected by a first bolt that passes through the rocker arm shaft and the rocker arm shaft mounting seat and is threaded to the cylinder head.
2. The rocker arm shaft oil passage assembly according to claim 1, characterized in that: The rocker arm shaft is provided with a first mounting hole, and the first bolt passes through the first mounting hole and is threadedly fixed to the cylinder head. The third oil passage includes a vertical hole extending in the vertical direction in the rocker arm shaft mounting seat and a horizontal groove connecting the first mounting hole and the vertical hole.
3. The rocker arm shaft oil passage assembly according to claim 2, characterized in that: The rocker arm shaft mounting base is provided with a second mounting hole. The first bolt passes through the first mounting hole and the second mounting hole and is threadedly fixed to the cylinder head. One end of the horizontal groove is connected to the upper end of the vertical hole, and the other end is connected to the upper end of the second mounting hole.
4. The rocker arm shaft oil passage assembly according to claim 3, characterized in that: A gap is formed between the inner wall of the lower end of the first mounting hole and the first bolt, and the gap connects the third oil passage and the second oil passage.
5. The rocker arm shaft oil passage assembly according to claim 4, characterized in that: An annular oil groove is formed on the upper end of the gap, surrounding the first bolt. The oil groove and the gap below it connect the third oil passage and the second oil passage.
6. The rocker arm shaft oil passage assembly according to claim 4, characterized in that: The lower end of the gap is flared, narrower at the top and wider at the bottom.