Novel oil injection channel

Abstract

The utility model discloses a novel oil injection channel, which is used in a screw nut transmission mechanism, the oil injection channel is formed through in the nut and the oil inlet of the oil injection channel is located on the circumference of the nut, and the oil inlet is sealed by the inner ring of a bearing and / or the inner ring of a belt wheel; the inner ring of the bearing is interference-fitted with the nut, and the belt wheel is interference-fitted with the nut; an oil storage area located in the middle region of the nut is formed at the oil outlet of the oil injection channel. The utility model optimizes the oil injection channel, when the nut and the bearing or the belt wheel are interference-fitted, the oil inlet is naturally sealed, and a lubricating oil inlet sealing cover does not need to be added, thereby solving the problem of reverse leakage of lubricating oil from the oil inlet in a low-cost manner, ensuring that the nut and the screw are in a good lubrication state for a long time, and improving the mechanical transmission efficiency of the screw and the nut.

Description

Technical Field

[0001] This utility model relates to vehicle steering systems, specifically to lubrication technology in steering structures, and particularly to a novel oil injection channel applied in rear wheel steering systems. Background Technology

[0002] In automotive rear-wheel steering technology, mechanical transmission efficiency is a crucial issue. Higher mechanical transmission efficiency requires less motor output power for the same rack force, resulting in lower costs and energy consumption. However, the mechanical transmission efficiency in rear-wheel steering is closely related to the lubrication effect during the engagement of the lead screw and nut in the rear-wheel steering mechanism; better lubrication leads to higher mechanical transmission efficiency.

[0003] In the current rear-wheel steering structure, the lubricating oil between the lead screw and the nut often flows out from the oil inlet in the opposite direction. This causes the lubricating oil to be severely lost after the lead screw and nut have been working for a period of time, eventually leading to severe wear between the lead screw and the nut. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a new type of oil injection channel, which can solve the problem that the lubricating oil between the lead screw and the nut often flows out from the oil inlet in the existing lubrication structure, causing serious wear between the lead screw and the nut.

[0005] To solve the above problems, the present invention provides a novel oil injection channel for use in a lead screw nut transmission mechanism. The oil injection channel is formed through the nut, and the oil inlet of the oil injection channel is located on the circumferential surface of the nut. The oil inlet is sealed by the inner ring of the bearing and / or the inner ring of the pulley.

[0006] Furthermore, the inner ring of the bearing is interference-fitted with the nut, and the pulley is interference-fitted with the nut.

[0007] Furthermore, the pulley abuts against the bearing.

[0008] Furthermore, the oil injection channel is an inclined channel.

[0009] Furthermore, an oil storage area is formed at the oil outlet of the oil injection channel, and the oil storage area is located in the middle area of ​​the nut.

[0010] Furthermore, the inner ring of the nut has a first threaded area and a second threaded area, the oil storage area is located between the first threaded area and the second threaded area, and the inner diameter of the hole in the oil storage area is larger than the inner diameter of the hole in the first threaded area and the inner diameter of the hole in the second threaded area, respectively.

[0011] Furthermore, the nut is fixed to the housing by the bearing.

[0012] Furthermore, the lead screw is connected to the rear wheel or the front wheel of the vehicle via a first connecting rod and a second connecting rod.

[0013] Compared with the prior art, the technical effects that this utility model can achieve are:

[0014] 1) This utility model optimizes the oil injection channel by setting the oil inlet of the oil injection channel on the circumferential surface of the nut, and ensuring that the oil inlet is located in the mating area between the nut and the bearing or the mating area between the nut and the pulley. In this way, when the nut and the bearing or pulley are interference-fitted, the oil inlet is naturally sealed, and there is no need to add a sealing cap for the lubricating oil inlet. This solves the problem of lubricating oil leaking backward from the oil inlet in a low-cost manner.

[0015] 2) The oil injection channel of this utility model can keep the lubricating oil between the nut and the lead screw from being lost for a long time, thereby ensuring that the nut and the lead screw are in a good lubrication state for a long time and improving the mechanical transmission efficiency of the lead screw and the nut.

[0016] 3) The oil injection channel of this utility model is connected to an oil storage area, which can ensure that the lost grease is replenished in time when it is lost due to mechanical reasons, thereby ensuring that the nut and lead screw can be fully lubricated. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rear wheel steering mechanism of this utility model;

[0018] Figure 2 This is a cross-sectional view of the oil injection channel of this utility model on the rear wheel steering mechanism;

[0019] Figure 3 This is a schematic diagram showing the external location of the oil injection channel of this utility model;

[0020] Figure 4 This is a cross-sectional view of the oil injection channel of this utility model on the nut.

[0021] The accompanying diagrams are labeled as follows:

[0022] 1 is a nut; 2 is a bearing; 3 is a housing; 4 is a pulley; 5 is a lead screw; 6 is a first connecting rod; 7 is a second connecting rod; 8 is an oil injection channel; 9 is an oil inlet; 10 is an oil outlet; 11 is an oil storage area; 12 is a first threaded area; 13 is a second threaded area. Detailed Implementation

[0023] The embodiments of this utility model are described below with reference to the accompanying drawings and specific examples. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be based on different viewpoints and applications. Those skilled in the art can make various similar extensions and substitutions without departing from the spirit of this utility model.

[0024] Example 1

[0025] The novel oil injection channel provided in this embodiment, such as Figure 1 As shown, this oil injection channel is used in the lead screw and nut transmission mechanism in front-wheel steering or rear-wheel steering. Wherein, as... Figure 1 As shown, nut 1 is fixed to housing 3 by bearing 2, and nut 1 and the inner ring of bearing 2 are interference-fitted. Nut 1 and pulley 4 are also interference-fitted. When the motor ( Figure 1 When the pulley 4 (not shown) rotates, since the pulley 4 and nut 1 are fixedly connected by an interference fit, the pulley 4 will inevitably drive the nut 1 to rotate. Because the nut 1 and lead screw 5 are connected by threads, and the nut 1 is fixed to the housing 3 by the bearing 2, the rotation of the nut 1 will cause the lead screw 5 to move axially left and right. Finally, the lead screw 5 is connected to the rear wheel of the vehicle through the first connecting rod 6 and the second connecting rod 7 to achieve rear wheel rotation. Of course, the aforementioned structure can also be connected to the front wheel of the vehicle to achieve front wheel rotation.

[0026] To reduce the coefficient of friction when the nut 1 and the lead screw 5 rotate relative to each other, lubricating oil needs to be injected into the mating area of ​​the nut 1 and the lead screw 5 through the oil injection channel 8. To prevent the lubricating oil between the lead screw 5 and the nut 1 from flowing out of the oil inlet, in this embodiment, the oil injection channel 8 is formed through the nut 1, as shown below. Figure 2 and Figure 3 As shown, the oil inlet 9 of the oil injection channel 8 is located on the circumferential surface of the nut 1.

[0027] like Figure 2 As shown, pulley 4 abuts against bearing 2 and engages with nut 1. Oil inlet 9 is sealed by the inner rings of bearing 2 and pulley 4. When grease is injected through oil inlet 9 along oil injection channel 8 and assembled into an assembly, due to the interference fit between the inner rings of nut 1 and bearing 2, and between nut 1 and pulley 4, and because the mating area includes the area where oil inlet 9 of oil injection channel 8 is located, oil inlet 9 is sealed by the inner rings of bearing 2 and pulley 4. This ensures that the injected grease will not flow out from oil inlet 9, thereby ensuring that nut 1 and lead screw 5 are in a fully lubricated state. The frictional force generated by the relative movement between nut 1 and lead screw 5 is very small, which can significantly improve the mechanical transmission efficiency of the product.

[0028] In this embodiment, as Figure 2 As shown, the oil injection channel 8 is an inclined channel. Of course, the inclination angle of the oil injection channel 8 determines whether the oil inlet 9 is sealed by the inner ring of the bearing 2, the inner ring of the pulley 4, or both the bearing 2 and the pulley 4.

[0029] This embodiment optimizes the oil injection channel 8 by placing the oil inlet 9 on the circumferential surface of the nut 1. Furthermore, it ensures that the inlet 9 is located within the mating areas of the nut 1 and bearing 2, and the mating areas of the nut 1 and pulley 4. This way, when the nut 1 and bearing 2 or pulley 4 are in an interference fit, the inlet 9 is naturally sealed, eliminating the need for an additional lubricating oil inlet sealing cap. This solves the problem of lubricating oil leaking backwards from the inlet in a low-cost manner. Moreover, this oil injection channel 8 can prevent the loss of lubricating oil between the nut 1 and the lead screw 5 for extended periods, ensuring that the nut 1 and lead screw 5 are in a state of good lubrication for a long time, thus improving the mechanical transmission efficiency of the lead screw 5 and nut 1.

[0030] Example 2

[0031] Based on Embodiment 1, an oil storage area 11 is formed at the oil outlet 10 of the oil injection channel 8 in this embodiment, such as... Figure 4 As shown, the oil storage area 11 is located in the middle region of the nut 1. The inner ring of the nut 1 forms a first threaded area 12 and a second threaded area 13. The oil storage area 11 is located between the first threaded area 12 and the second threaded area 13, and the inner diameter of the hole in the oil storage area 11 is larger than the inner diameter of the holes in the first threaded area 12 and the second threaded area 13, respectively. This ensures that when grease is lost due to mechanical reasons, the oil storage area 11 can replenish the lost grease in time, ensuring that the nut 1 and the lead screw 5 are fully lubricated.

[0032] The present invention has been described in detail above through specific embodiments. These embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above-described implementation methods. Any equivalent substitutions and improvements made by those skilled in the art to the shape of the oil injection channel, etc., without departing from the principle of the present invention, should be considered within the technical scope protected by the present invention.

Claims

1. A novel oil injection channel, wherein the oil injection channel is used in a lead screw and nut transmission mechanism, characterized in that, The oil injection channel is formed through the nut, and the oil inlet of the oil injection channel is located on the circumferential surface of the nut. The oil inlet is sealed by the inner ring of the bearing and / or the inner ring of the pulley.

2. The novel oil injection channel according to claim 1, characterized in that, The inner ring of the bearing is interference-fitted with the nut, and the pulley is interference-fitted with the nut.

3. The novel oil injection channel according to claim 1, characterized in that, The pulley abuts against the bearing.

4. The novel oil injection channel according to claim 1, characterized in that, The oil injection channel is an inclined channel.

5. The novel oil injection channel according to claim 1, characterized in that, An oil storage area is formed at the oil outlet of the oil injection channel, and the oil storage area is located in the middle area of ​​the nut.

6. The novel oil injection channel according to claim 5, characterized in that, The inner ring of the nut has a first threaded area and a second threaded area. The oil storage area is located between the first threaded area and the second threaded area, and the inner diameter of the hole in the oil storage area is larger than the inner diameter of the hole in the first threaded area and the inner diameter of the hole in the second threaded area, respectively.

7. The novel oil injection channel according to claim 1, characterized in that, The nut is fixed to the housing by the bearing.

8. The novel oil injection channel according to claim 1, characterized in that, The lead screw is connected to the rear wheel or the front wheel of the vehicle via a first connecting rod and a second connecting rod.

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