Axle Camshaft Lubrication Structure

Technical Field

The utility model relates to the technical field of axles, in particular to an axle camshaft lubrication structure.

Background Technology

A camshaft is a component in a piston engine. Its function is to control the opening and closing of valves. In a four-stroke engine, the rotational speed of the camshaft is half that of the crankshaft, while in a two-stroke engine, the camshaft rotates at the same speed as the crankshaft. However, its rotational speed is still usually very high and it must withstand large torque. Therefore, camshaft design requires high strength and support performance. Its material is generally high-quality alloy steel or alloy steel. Since valve motion directly affects engine power and operating characteristics, camshaft design plays a very important role in engine design.

Existing camshaft lubrication structures mostly process grease injection holes on the cam bracket for adding grease. This structure is simple, but during use, the sliding bushing often rotates relative to the cam bracket hole, blocking the grease injection hole. As a result, the camshaft cannot be effectively lubricated, causing surface wear of the camshaft and reduced braking performance.

Therefore, it is necessary to provide an axle camshaft lubrication structure to solve the above technical problems.

Summary of the Utility Model

The utility model provides an axle camshaft lubrication structure, which solves the problems that existing axle camshaft lubrication structures are simple and cannot effectively lubricate the camshaft, resulting in surface wear of the camshaft.

The axle camshaft lubrication structure comprises:

a bearing shaft, one end of which is fixed with a shaft body. An oil inlet is formed on the surface of the bearing shaft, and one end of the oil inlet is connected with a first oil passage. The other end of the first oil passage is connected with a second oil passage, and the second oil passage is formed inside the shaft body. One end of the second oil passage is connected with an oil outlet hole formed on the surface of the shaft body. The other end of the second oil passage is connected with a third oil passage formed on the surface of the shaft body.

An auxiliary ring is fixed on the surface of the shaft body, and a lubrication mechanism is installed inside the auxiliary ring. The lubrication mechanism includes a sliding groove formed on the surface of the auxiliary ring. An movable groove is formed in the inner wall of the sliding groove, and a spring is fixed inside the movable groove. One end of the spring is fixed with a movable block, and the other end of the movable block is fixed with a bearing sleeve. A ball is connected inside the bearing sleeve, and one end of the ball is in contact with the surface of the shaft body.

A journal is sleeved on the surface of the shaft body, and one end of the journal is in contact with one end of the auxiliary ring. A cam shaft is fixed on one side of the journal.

Preferably, the first oil passage is formed inside the main bearing shaft, and one end of the first oil passage and one end of the second oil passage form a T-shaped structure. The third oil passage is in a threaded shape. The auxiliary ring is sleeved with the shaft body, the shaft body is sleeved with the journal, and the shaft body is sleeved with the cam shaft.

Preferably, the sliding groove is arc-shaped. The sliding groove is engaged with the movable groove, and the movable groove forms an elastic telescopic structure with the movable block through the spring. The bearing sleeve is arc-shaped, and the bearing sleeve is rotatably connected with the ball.

Preferably, sponge layers are fixed on both sides of the cam shaft, and one end of each sponge layer is connected with a clamping plate.

Preferably, the sponge layers are sleeved with the shaft body, and one end of each sponge layer is in contact with one end of the cam shaft. The clamping plates are symmetrically arranged about the central axis of the cam shaft, and the clamping plates are sleeved with the shaft body.

Preferably, an auxiliary shaft is sleeved on the surface of the shaft body, and a fourth oil passage is formed on the surface of the auxiliary shaft.

Beneficial Effects

Compared with the prior art, the utility model has the following beneficial effects:

Under the action of the lubrication mechanism, the balls reduce friction between the shaft body and the auxiliary ring. The auxiliary ring can effectively protect the gap between the shaft body and the journal, preventing particles from affecting their operation and improving the lubrication effect of the structure.

The spring prevents excessive clearance between the shaft body and the journal from causing serious damage to the camshaft, thereby improving the service life of the camshaft and reducing the customer’s economic cost.

Sponge layers are arranged on both sides of the journal. Lubricating oil can be absorbed into the sponge layers. When the shaft body rotates, under the action of centrifugal force, part of the oil inside the sponge layers separates from the sponge layers, allowing other parts of the shaft body to be coated with lubricating oil and improving the overall lubrication effect. The sponge layers also enhance the lubrication effect of the cam shaft. The clamping plates prevent the sponge layers from separating from the shaft body due to excessive rotational speed, thereby improving lubrication efficiency.

The oil outlet holes allow part of the lubricating oil to adhere to the surface of the shaft body, improving the lubrication effect of the shaft body. The third oil passage is threaded, allowing the grease inside the third oil passage to flow under centrifugal force and preventing grease from blocking the third oil passage.

Description of Drawings

Figure 1 is a structural schematic diagram of a preferred embodiment of the axle camshaft lubrication structure provided by the utility model.
Figure 2 is a structural schematic diagram of the lubrication mechanism.
Figure 3 is a side structural schematic diagram of the lubrication mechanism.

Reference Numerals

Bearing shaft

Shaft body

Oil inlet

First oil passage

Second oil passage

Oil outlet hole

Third oil passage

Auxiliary ring

Lubrication mechanism

Sliding groove

Movable groove

Spring

Movable block

Bearing sleeve

Ball

Journal

Cam shaft

Sponge layer

Clamping plate

Auxiliary shaft

Fourth oil passage

Specific Embodiment

Please refer to Figure 1, Figure 2, and Figure 3. Figure 1 is a structural schematic diagram of a preferred embodiment of the axle camshaft lubrication structure provided by the utility model; Figure 2 is a structural schematic diagram of the lubrication mechanism; and Figure 3 is a side structural schematic diagram of the lubrication mechanism.

The axle camshaft lubrication structure includes a bearing shaft 1. One end of the bearing shaft 1 is fixed with a shaft body 2. An oil inlet 3 is formed on the surface of the bearing shaft 1, and one end of the oil inlet 3 is connected with a first oil passage 4. The other end of the first oil passage 4 is connected with a second oil passage 5, and the second oil passage 5 is formed inside the shaft body 2. One end of the second oil passage 5 is connected with an oil outlet hole 6, which is formed on the surface of the shaft body 2. The other end of the second oil passage 5 is connected with a third oil passage 7, which is formed on the surface of the shaft body 2.

An auxiliary ring 8 is fixed on the surface of the shaft body 2, and a lubrication mechanism 9 is installed inside the auxiliary ring 8. The lubrication mechanism 9 includes a sliding groove 901 formed on the surface of the auxiliary ring 8. A movable groove 902 is formed in the inner wall of the sliding groove 901, and a spring 903 is fixed inside the movable groove 902. One end of the spring 903 is fixed with a movable block 904, and the other end of the movable block 904 is fixed with a bearing sleeve 905. A ball 906 is connected inside the bearing sleeve 905, and one end of the ball 906 is in contact with the surface of the shaft body 2.

A journal 10 is sleeved on the surface of the shaft body 2, and one end of the journal 10 is in contact with one end of the auxiliary ring 8. A cam shaft 11 is fixed on one side of the journal 10. The oil outlet hole 6 is formed on the surface of the shaft body 2, allowing lubricating oil to adhere to the surface of the shaft body 2 and improving the lubrication efficiency of the shaft body surface.

The first oil passage 4 is formed inside the main bearing shaft 1, and one end of the first oil passage 4 and one end of the second oil passage 5 form a T-shaped structure. The third oil passage 7 is threaded. The auxiliary ring 8 is sleeved with the shaft body 2, the shaft body 2 is sleeved with the journal 10, and the shaft body 2 is sleeved with the cam shaft 11. The threaded third oil passage 7 allows lubricating oil inside the third oil passage 7 to flow through rotation of the shaft body 2.

The sliding groove 901 is arc-shaped, and the sliding groove 901 is engaged with the movable groove 902. The movable groove 902 forms an elastic telescopic structure with the movable block 904 through the spring 903. The bearing sleeve 905 is arc-shaped and is rotatably connected with the ball 906. The arc-shaped sliding groove 901 allows the bearing sleeve 905 to fit perfectly with the sliding groove 901, preventing the bearing sleeve 905 from jamming and affecting the lubrication effect of the structure.

Sponge layers 12 are fixed on both sides of the cam shaft 11, and one end of each sponge layer 12 is connected with a clamping plate 13. The sponge layers 12 allow lubricating oil to penetrate into them, thereby lubricating the cam shaft 11.

The sponge layers 12 are sleeved with the shaft body 2, and one end of each sponge layer 12 is in contact with one end of the cam shaft 11. The clamping plates 13 are symmetrically arranged about the central axis of the cam shaft 11, and the clamping plates 13 are sleeved with the shaft body 2. The clamping plates 13 effectively fix the sponge layers 12 and prevent them from separating from both sides of the cam shaft 11.

An auxiliary shaft 14 is sleeved on the surface of the shaft body 2, and a fourth oil passage 15 is formed on the surface of the auxiliary shaft 14. This arrangement further improves the lubrication efficiency of the structure.

Working Principle

First, lubricating oil is poured into the first oil passage 4 through the oil inlet 3. The lubricating oil then flows into the second oil passage 5. Part of the lubricating oil flows through the oil outlet hole 6 and adheres to the surface of the shaft body 2. Another part of the grease flows from the second oil passage 5 into the third oil passage 7.

By rotating the shaft body 2, under the action of centrifugal force, the grease flows inside the third oil passage 7 to the gap between the auxiliary ring 8 and the journal 10.

Under the action of the lubrication mechanism 9, the balls 906 reduce friction between the shaft body 2 and the auxiliary ring 8. The auxiliary ring 8 effectively protects the gap between the shaft body 2 and the journal 10, preventing particles from affecting their operation and improving the lubrication effect of the structure.

The spring 903 prevents excessive clearance between the shaft body 2 and the journal 10 from causing serious damage to the camshaft, thereby improving the service life of the camshaft and reducing the customer’s economic cost.

Lubricating oil is absorbed into the sponge layers 12. When the shaft body 2 rotates, under the action of centrifugal force, part of the oil inside the sponge layers 12 separates from the sponge layers, allowing other components of the shaft body 2 to be coated with lubricating oil, thereby improving the overall lubrication effect. The sponge layers 12 also enhance the lubrication effect of the cam shaft 11.

The clamping plates 13 prevent the sponge layers 12 from separating from the shaft body 2 due to excessive rotational speed, thereby improving lubrication efficiency. The fourth oil passage 15 enables other parts of the shaft body 2 to be effectively lubricated, further improving the overall lubrication efficiency of the structure.

The above descriptions are only embodiments of the utility model and do not limit the patent scope of the utility model. Any equivalent structural or process transformations made based on the specification and drawings of the utility model, or any direct or indirect application in other related technical fields, shall also fall within the protection scope of the utility model patent.