An internal lubrication system for an electric power steering gear

Abstract

The utility model discloses an internal lubrication system of an electric power steering device, including a housing, a worm wheel, a worm, and an oil brush assembly. A first transmission cavity is arranged in the housing, a worm wheel is rotatably connected in the first transmission cavity, a second transmission cavity is arranged inside the housing on one side of the first transmission cavity, a worm is rotatably connected in the second transmission cavity, the worm and the worm wheel are meshed and connected with each other, a roller brush groove is arranged in the housing on one side of the second transmission cavity, an oil brush assembly is installed in the roller brush groove, and the oil brush assembly is in contact with the worm. The utility model aims to provide an electric power steering device lubrication system with an efficient lubrication structure, improved lubrication uniformity, and improved internal friction and wear.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering gear lubrication systems, in particular to an internal lubrication system for an electric power steering gear. Background Art

[0002] In modern automobile steering systems, electric power steering (EPS) is widely used due to its superior performance and reliability. The electric power steering achieves more flexible and precise steering control through the power assistance provided by the electric motor. However, due to the friction contact between the worm wheel and the worm inside the electric power steering, this may cause friction loss and wear problems in the system, thereby affecting the working efficiency and service life of the system. In order to improve these problems, traditional lubrication systems usually adopt manual refueling or fixed oil amount lubrication, which is difficult to maintain continuous and uniform lubrication in practical applications. In order to solve these problems, the present application proposes an improved internal lubrication system, which effectively applies lubricating oil to the surface of the worm by setting an oil brush assembly to ensure good lubrication between the worm and the worm wheel, thereby reducing friction, reducing wear, and improving the working efficiency and service life of the system. This innovative design helps to solve the problem of insufficient lubrication in the prior art and provides a more reliable and efficient steering assistance solution. Utility Model Content

[0003] In view of the above-mentioned deficiencies existing in the prior art, the utility model aims to provide an electric power steering lubrication system with a highly efficient lubrication structure, improved lubrication uniformity, and improved internal friction and wear.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: an internal lubrication system of an electric power steering device, including a shell, a worm wheel, a worm, and an oil brush assembly. A first transmission chamber is arranged in the shell, and a worm wheel is rotatably connected in the first transmission chamber. A second transmission chamber is arranged inside the shell on one side of the first transmission chamber, and a worm is rotatably connected in the second transmission chamber. The worm and the worm wheel are meshed and connected with each other. A rolling brush groove is arranged in the shell body on one side of the second transmission chamber, and an oil brush assembly is installed in the rolling brush groove. The oil brush assembly is in contact with the worm. When in use, the power-assisting motor is connected to one end of the worm, and the worm is connected to the worm wheel for transmission. The worm wheel transmits power to the steering system through the central shaft. During the operation of the electric power steering device, the oil brush assembly continuously brushes lubricating oil on the worm, thereby ensuring that the contact surface between the worm and the worm wheel always maintains a good lubrication state, reducing friction, reducing wear, and improving the working efficiency and service life of the system.

[0005] In one of the embodiments, the oil brush assembly includes a rotating shaft, an oil seal bearing, an oil guide pipe, and a transmission assembly. The rotating shaft is rotatably connected in the roller brush groove, an oil guide channel is defined in the rotating shaft, an oil seal bearing is engaged and connected at the opening of the oil guide channel, an oil guide pipe is fixedly connected to the middle of the inner ring of the oil seal bearing, one end of the oil guide pipe is connected to the oil guide channel, the other end of the oil guide pipe is fixedly connected to the outer wall of the outer shell, the other end of the oil guide pipe extends outward from the outer wall of the outer shell, the other end of the rotating shaft is fixedly connected to the transmission shaft, and the other end of the transmission shaft is connected to the transmission assembly after passing through the outer shell.

[0006] In one embodiment, two spirally wound rolling brushes are fixedly connected to the rotating shaft, and a plurality of oil guide holes are respectively opened on the rotating shaft between the two rolling brushes. The oil guide holes are connected to the oil guide channel, and the outer bristles of the rolling brushes are in contact with the screw.

[0007] In one embodiment, an oil outlet pipe is fixedly connected to the inner wall of the first transmission cavity, one end of the oil outlet pipe extends to the outside of the outer shell, the outer end of the oil outlet pipe is connected to the oil return tank through an oil pipe, and an oil supply pump is fixedly connected to the oil return tank, and the oil supply pump is connected to the oil guide pipe through an oil pipe.

[0008] In one of the embodiments, the transmission assembly includes a transmission housing, a first gear, a second gear, a first pulley, a second pulley, and a driving shaft. One end of the worm is fixedly connected to the driving shaft. After the driving shaft passes through the transmission housing, it is fixedly connected to the first pulley. The first pulley is transmission-connected to the second pulley via a belt. A second gear is fixedly connected to the central axis of the second pulley. The second gear and the second pulley are both rotationally connected to the middle of the transmission housing. After one end of the transmission shaft passes through the transmission housing, it is fixedly connected to the first gear. The first gear and the second gear are meshed with each other.

[0009] Beneficial effects of the utility model:

[0010] 1. Continuous and uniform lubrication: Through the design of the oil brush assembly, the system can continuously and evenly apply lubricating oil to the surface of the worm, ensuring that the worm and the worm wheel always maintain a good lubrication state; this continuous and uniform lubrication can effectively reduce friction and wear, thereby extending the service life of the system;

[0011] 2. Improve system efficiency: Due to the improvement of lubrication status, the friction loss inside the system is significantly reduced, thereby improving the working efficiency of the electric power steering; lower friction not only improves the steering response speed, but also reduces the load on the motor and optimizes energy consumption;

[0012] 3. Reduce maintenance costs: The internal lubrication system can reduce the need for frequent maintenance and lubricant replenishment, thereby reducing the maintenance cost of the vehicle. The automated design of the lubrication system makes the lubrication process more convenient and efficient, reducing the necessity for manual intervention;

[0013] 4. Improve reliability: This system reduces wear and failure through effective lubrication of the worm and worm wheel, and improves the overall reliability of the electric power steering, which has an important positive impact on the safety and stability of the vehicle;

[0014] 5. Innovative design advantages: The utility model optimizes the lubricating oil delivery path by arranging an oil guide pipe and an oil seal bearing in the rotating shaft, ensuring effective contact between the oil brush assembly and the worm. This innovative design solves the problem of uneven lubrication in traditional lubrication systems and provides a more advanced and efficient lubrication solution for electric power steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the oil return tank connection structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the connection structure of the oil brush assembly of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-sectional connection structure of the transmission component of the utility model.

[0019] In the figure: 1 housing, 2 worm gear, 3 worm, 4 oil brush assembly, 5 first transmission chamber, 6 second transmission chamber, 7 rolling brush groove, 101 rotating shaft, 102 oil seal bearing, 103 oil guide pipe, 104 transmission assembly, 105 oil guide channel, 106 transmission shaft, 107 rolling brush, 108 oil guide hole, 201 oil outlet pipe, 202 oil return tank, 203 oil supply pump, 301 transmission housing, 302 first gear, 303 second gear, 304 first pulley, 305 second pulley, 306 driving shaft. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] See also Figure 1-4, an internal lubrication system of an electric power steering device, comprising a shell 1, a worm wheel 2, a worm 3, and an oil brush assembly 4. A first transmission chamber 5 is provided in the shell 1, and the worm wheel 2 is rotatably connected in the first transmission chamber 5. A second transmission chamber 6 is provided inside the shell 1 on one side of the first transmission chamber 5, and the worm 3 is rotatably connected in the second transmission chamber. The worm 3 and the worm wheel 2 are meshed and connected with each other. A rolling brush groove 7 is provided in the shell 1 on one side of the second transmission chamber, and the oil brush assembly 4 is installed in the rolling brush groove 7. The oil brush assembly 4 is in contact with the worm 3. When in use, the power-assisting motor is connected to one end of the worm 3, and the worm 3 is transmission-connected to the worm wheel 2. The worm wheel 2 transmits power to the steering system through the central shaft. During the operation of the electric power steering device, the oil brush assembly 4 continuously brushes lubricating oil on the worm 3, thereby ensuring that the contact surface between the worm 3 and the worm wheel 2 always maintains a good lubrication state, reducing friction, reducing wear, and improving the working efficiency and service life of the system.

[0022] In one embodiment, the oil brush assembly 4 includes a rotating shaft 101, an oil seal bearing 102, an oil guide pipe 103, and a transmission assembly 104. The rotating shaft 101 is rotatably connected in the roller brush groove 7. An oil guide channel 105 is provided in the rotating shaft 101. The oil seal bearing 102 is engaged and connected at the opening of the oil guide channel 105. The middle part of the inner ring of the oil seal bearing 102 is fixedly connected with an oil guide pipe 103. One end of the oil guide pipe 103 is connected to the oil guide channel 105. The other end of the oil guide pipe 103 is fixedly connected to the outer wall of the shell 1. The other end of the oil guide pipe 103 extends outward from the outer wall of the shell 1. The other end of the rotating shaft 101 is fixedly connected to the transmission shaft 106. The other end of the transmission shaft 106 passes through the shell 1 and is connected to the transmission assembly 104; the rotating shaft 101 Two spirally wound rolling brushes 107 are fixedly connected, and a plurality of oil guide holes 108 are respectively opened on the rotating shaft 101 between the two rolling brushes 107. The oil guide holes 108 are connected to the oil guide channel 105, and the outer bristles of the rolling brush 107 are in contact with the screw. During operation, the worm 3 drives the transmission shaft 106 and the rotating shaft 101 to rotate through the transmission assembly 104, and the rotating shaft 101 drives the rolling brush 107 on its surface to rotate. At this time, the lubricating oil is injected into the oil guide channel 105 through the oil guide pipe 103, and then the lubricating oil is discharged outward through the connected oil guide holes 108. The discharged lubricating oil adheres to the rolling brush 107 through capillary action, and finally the attached lubricating oil is evenly applied to the surface of the worm 3 through the brush.

[0023] In one of the embodiments, an oil outlet pipe 201 is fixedly connected to the inner wall of the first transmission chamber 5, one end of the oil outlet pipe 201 extends to the outside of the outer shell 1, and the outer end of the oil outlet pipe 201 is connected to the return oil tank 202 through an oil pipe. An oil supply pump 203 is fixedly connected to the return oil tank 202, and the oil supply pump 203 is connected to the oil guide pipe 103 through an oil pipe. In the utility model, the oil outlet pipe 201 is located at the bottom of the device. In actual application, a plurality of oil outlet pipes 201 can be set on the inner wall of the first transmission chamber 5. A suitable oil outlet pipe 201 is selected according to the actual installation position of the device, and the remaining oil outlet pipes 201 are blocked by sealing caps, and then the lubricating oil in the shell is gathered downward in the oil outlet pipe 201 by gravity, and then the lubricating oil is guided to the return oil tank 202 through the oil outlet pipe 201. When the device is working, the lubricating oil is continuously transmitted to the oil brush assembly through the oil supply pump 203, thereby forming a circulation of the lubricating oil in turn.

[0024] In one embodiment, the transmission assembly 104 includes a transmission housing 301, a first gear 302, a second gear 303, a first pulley 304, a second pulley 305, and a drive shaft 306. One end of the worm 3 is fixedly connected to the drive shaft 306. The drive shaft 306 is fixedly connected to the first pulley 304 after passing through the transmission housing 301. The first pulley 304 is connected to the second pulley 305 through a belt. The second gear 303 is fixedly connected to the central axis of the second pulley 305. The second gear 303 and the second pulley 305 are both rotatably connected to the transmission housing 301. In the middle part, one end of the transmission shaft 106 passes through the transmission housing 301 and is fixedly connected with the first gear 302. The first gear 302 and the second gear 303 are meshed with each other. In use, the worm 3 drives the driving shaft 306 to rotate, and the driving shaft 306 drives the first pulley 304 to rotate. The first pulley 304 drives the second pulley 305 to rotate through the belt, and the second pulley 305 drives the coaxial second gear 303 to rotate. The second gear 303 drives the meshed first gear 302 to rotate, and drives the transmission shaft 106 and the rotating shaft 101 to rotate through the first gear 302.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An internal lubrication system for an electric power steering device, comprising a housing (1), a worm wheel (2), a worm (3), and an oil brush assembly (4), characterized in that: A first transmission chamber (5) is arranged in the housing (1), a worm wheel (2) is rotatably connected in the first transmission chamber (5), a second transmission chamber (6) is arranged in the housing (1) on one side of the first transmission chamber (5), a worm (3) is rotatably connected in the second transmission chamber, the worm (3) and the worm wheel (2) are meshingly connected, a rolling brush groove (7) is arranged in the housing (1) on one side of the second transmission chamber, an oil brush assembly (4) is installed in the rolling brush groove (7), and the oil brush assembly (4) is in contact with the worm (3).

2. The internal lubrication system of an electric power steering according to claim 1, characterized in that: The oil brush assembly (4) comprises a rotating shaft (101), an oil seal bearing (102), an oil guide pipe (103), and a transmission assembly (104); the rotating shaft (101) is rotatably connected in the roller brush groove (7); an oil guide passage (105) is provided in the rotating shaft (101); an oil seal bearing (102) is engaged with the orifice of the oil guide passage (105); an oil guide pipe (103) is fixedly connected to the middle of the inner ring of the oil seal bearing (102); one end of the oil guide pipe (103) is connected to the oil guide passage (105); the other end of the oil guide pipe (103) is fixedly connected to the outer wall of the housing (1); the other end of the oil guide pipe (103) extends outward from the outer wall of the housing (1); the other end of the rotating shaft (101) is fixedly connected to the transmission shaft (106); the other end of the transmission shaft (106) passes through the housing (1) and is connected to the transmission assembly (104).

3. The internal lubrication system of an electric power steering according to claim 2, characterized in that: Two spirally wound rolling brushes (107) are fixedly connected to the rotating shaft (101); a plurality of oil guide holes (108) are respectively provided on the rotating shaft (101) between the two rolling brushes (107); the oil guide holes (108) are connected to the oil guide channel (105); and the outer bristles of the rolling brushes (107) are in contact with the screw.

4. The internal lubrication system of an electric power steering according to claim 3, characterized in that: An oil outlet pipe (201) is fixedly connected to the inner wall of the first transmission chamber (5), one end of the oil outlet pipe (201) extends to the outside of the outer shell (1), one end of the outer portion of the oil outlet pipe (201) is connected to an oil return tank (202) via an oil pipe, an oil supply pump (203) is fixedly connected to the inside of the oil return tank (202), and the oil supply pump (203) is connected to an oil guide pipe (103) via an oil pipe.

5. The internal lubrication system of an electric power steering according to claim 4, characterized in that: The transmission assembly (104) comprises a transmission housing (301), a first gear (302), a second gear (303), a first pulley (304), a second pulley (305), and a driving shaft (306); one end of the worm (3) is fixedly connected to the driving shaft (306); the driving shaft (306) is fixedly connected to the first pulley (304) after passing through the transmission housing (301); the first pulley (304) is transmission-connected to the second pulley (305) via a belt; a second gear (303) is fixedly connected to the central axis of the second pulley (305); the second gear (303) and the second pulley (305) are both rotationally connected to the middle of the transmission housing (301); one end of the transmission shaft (106) is fixedly connected to the first gear (302) after passing through the transmission housing (301); the first gear (302) and the second gear (303) are meshingly connected to each other.

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