Ball pin seat for automobile steering system

Abstract

The utility model discloses a ball pin seat for automobile steering system, shell, the ball seat body of integral mould with shell, the bushing of being located in the ball seat body and the ball pin of bottom embedding in the bushing, the ball seat body center is equipped with the mounting hole of going through up and down, the bushing is located in the mounting hole, and the bottom of mounting hole is connected with the compression seat of screw thread, is equipped with the oil storage cavity in the compression seat, and the bottom of bushing is equipped with a plurality of drainage holes of uniformity in the circumference, and the both ends of drainage hole communicate bushing inside and oil storage cavity, and the clearance between ball pin and bushing is filled with lubricating oil, and the oil storage cavity is filled with the inflation graphite - paraffin compound, the inner wall of drainage hole is processed to have spiral flow guide groove, and the inflation graphite - paraffin compound filled in the oil storage cavity melts and expands when temperature rises, and the stored lubricating oil is pumped back to bushing and realizes self -lubricating in reverse, and the inflation graphite promotes lubricating oil microcirculation under the vibration of vehicle, reduces the wear and tear of ball pin seat, prolongs the life.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive steering system equipment, and particularly relates to ball joint seats for automotive steering systems. Background Technology

[0002] The steering tie rod assembly in automobiles mainly bears the steering and support functions of the steering system. It is one of the most important components in the steering system, as it mainly bears the steering action during vehicle operation and plays a key role in the vehicle's handling stability and driving safety. However, during long-term vehicle operation, the lubricating oil in the ball joint seat can easily accumulate at the bottom of the bushing due to gravity, resulting in insufficient lubrication in the ball joint seat and aggravating wear. Utility Model Content

[0003] The purpose of this invention is to solve the aforementioned technical problems in the prior art and to provide a ball pin seat for an automotive steering system that achieves self-lubrication.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A ball joint seat for an automotive steering system comprises a housing, a ball joint body integrally formed with the housing, a bushing disposed within the ball joint body, and a ball joint with its bottom embedded within the bushing. The ball joint body has a through mounting hole at its center, and the bushing is disposed within the mounting hole. A clamping seat is threaded to the bottom of the mounting hole, and an oil reservoir is disposed within the clamping seat. Multiple drainage holes are evenly distributed around the bottom of the bushing, with both ends of the drainage holes connecting the interior of the bushing to the oil reservoir. The gap between the ball joint and the bushing is filled with lubricating oil, and the drainage holes are used to guide the lubricating oil accumulated in the gap at the bottom of the bushing to the oil reservoir for temporary storage.

[0006] Furthermore, the oil storage cavity is filled with an expanded graphite-paraffin composite.

[0007] Furthermore, the inner wall of the drainage hole is machined with a spiral guide groove.

[0008] Furthermore, the oil storage chamber is equipped with a pressure balancing device.

[0009] Furthermore, the top of the ball seat is provided with several locking blocks, the top of the ball pin is wrapped with a rubber sleeve, and the bottom of the rubber sleeve is provided with a retaining ring. The locking blocks and the retaining ring engage to form a sealed and dustproof structure for the open end of the ball seat.

[0010] Furthermore, an annular groove is provided on the outer side of the top of the ball pin, and a limiting ring is symmetrically embedded in the groove. The opposite sides of the limiting ring are provided with grooves. The top of the rubber sleeve is provided with protrusions on both sides, and the protrusions are engaged in the grooves to achieve axial fixation between the rubber sleeve and the ball pin.

[0011] Furthermore, the inner wall of the bushing is provided with an annular mounting groove, in which a mounting ring is embedded. An elastic sealing ring is nested inside the mounting ring, and the elastic sealing ring abuts against the outer wall of the ball pin to achieve a seal.

[0012] Furthermore, an annular sealing gasket is pressed between the clamping seat and the ball seat body.

[0013] Furthermore, the top opening edge of the mounting hole is provided with an outwardly expanding bevel, which is used to expand the deflection angle range of the ball pin in the ball seat body.

[0014] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0015] 1. In this utility model, the interference fit between the locking block at the top of the ball seat and the rubber sleeve retaining ring, the axial fixation between the rubber sleeve protrusion and the upper limit ring groove of the ball pin, combined with the dynamic sealing of the elastic sealing ring inside the bushing and the annular sealing gasket between the pressing seat and the ball seat, form multiple effective seals, reliably preventing external dust and mud from entering and internal lubricating oil from leaking.

[0016] 2. In this utility model, the expanded graphite-paraffin composite filled in the oil storage cavity melts and expands when the temperature rises, and pumps the stored lubricating oil back into the bushing to achieve self-lubrication. At the same time, the expanded graphite promotes the microcirculation of lubricating oil under vehicle vibration, which effectively solves the problems of uneven distribution of lubricating oil and insufficient lubrication caused by gravity, reduces the wear of the ball pin seat, and extends its service life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 This is a cross-sectional view of the ball joint seat for the automotive steering system of this utility model;

[0019] Figure 2 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0020] Figure 3 for Figure 1 Enlarged schematic diagram of the local structure at point B.

[0021] In the figure: 1-Housing; 2-Ball seat; 3-Bushing; 4-Ball pin; 5-Mounting hole; 6-Pressure seat; 7-Oil reservoir; 8-Drainage hole; 9-Expanded graphite-paraffin composite; 10-Spiral guide groove; 11-Pressure balancing device; 12-Clamping block; 13-Rubber sleeve; 14-Clamping ring; 15-Annular groove; 16-Limiting ring; 17-Groove; 18-Protrusion; 19-Mounting groove; 20-Mounting ring; 21-Elastic sealing ring; 22-Annular sealing gasket; 23-Bevel. Detailed Implementation

[0022] like Figures 1 to 3 As shown, this utility model relates to a ball joint seat for an automotive steering system, comprising a housing 1, a ball joint body 2 integrally formed with the housing 1, a bushing 3 disposed within the ball joint body 2, and a ball joint 4 with its bottom embedded within the bushing 3. The ball joint body 2 has a through mounting hole 5 at its center, and the bushing 3 is disposed within the mounting hole 5. A clamping seat 6 is threadedly connected to the bottom of the mounting hole 5, and an oil reservoir 7 is disposed within the clamping seat 6. Multiple drainage holes 8 are evenly distributed around the bottom of the bushing 3, and the two ends of the drainage holes 8 connect the interior of the bushing 3 to the oil reservoir 7. The gap between the ball joint 4 and the bushing 3 is filled with lubricating oil, and the drainage holes 8 are used to guide the lubricating oil accumulated at the bottom gap of the bushing 3 to the oil reservoir 7 for temporary storage.

[0023] The oil storage cavity 7 is filled with expanded graphite-paraffin composite 9.

[0024] The ball pin 4 seat includes a housing 1, a ball seat body 2 integrally formed with the housing 1, a bushing 3 disposed in the ball seat body 2, and a ball pin 4 whose bottom is embedded in the bushing 3.

[0025] The ball seat 2 has a cylindrical mounting hole 5 that runs vertically through the center. The bushing 3 is made of high-strength nylon material and is set in the mounting hole 5 by interference fit. The bottom of the mounting hole 5 is machined with internal thread, which matches the external thread of the clamping seat 6.

[0026] The clamping seat 6 is provided with an oil storage cavity 7, which is filled with expanded graphite-paraffin composite 9, wherein the paraffin content is 40% and the composite filling rate is 80% of the volume of the oil storage cavity 7.

[0027] The inner wall of the drainage hole 8 is machined with a spiral guide groove 10.

[0028] The bottom of the bushing 3 is machined with several evenly distributed drainage holes 8, the diameter of which is 0.5mm. The inner wall of the drainage holes 8 is machined with a right-hand spiral guide groove 10.

[0029] The oil storage chamber 7 is equipped with a pressure balancing device 11.

[0030] The oil storage chamber 7 is equipped with a one-way breathable membrane made of polytetrafluoroethylene. The one-way breathable membrane is located at the end of the oil storage chamber 7 away from the drainage hole 8, specifically installed in the hole at the top or upper side of the oil storage chamber 7. The surface of the breathable membrane is distributed with micropores with an average pore diameter of 5μm and a porosity of 35%, ensuring that only gas is allowed to pass through while blocking lubricating oil from seeping out.

[0031] The ball seat body 2 has several locking blocks 12 on its top, and the ball pin 4 is wrapped with a rubber sleeve 13 on its top. The bottom of the rubber sleeve 13 is provided with a retaining ring 14. The locking blocks 12 and the retaining ring 14 are engaged to form a sealed and dustproof structure for the open end of the ball seat body 2.

[0032] The top outer side of the ball pin 4 is provided with an annular groove 15, and a limiting ring 16 is symmetrically embedded in the groove. The opposite sides of the limiting ring 16 are provided with grooves 17. The top two sides of the rubber sleeve 13 are symmetrically provided with protrusions 18, which are engaged in the grooves 17 to achieve axial fixation between the rubber sleeve 13 and the ball pin 4.

[0033] The top of the ball pin 4 is fitted with a nitrile rubber sleeve 13, and the bottom of the rubber sleeve 13 is provided with a retaining ring 14. The top of the ball seat 2 is machined with four evenly distributed L-shaped retaining blocks 12, which form an interference fit with the retaining rings 14. The outer side of the top of the ball pin 4 is machined with an annular groove 15, within which two symmetrically fitted limiting rings 16 are fitted. The opposite sides of the limiting rings 16 are machined with grooves 17. The inner wall of the top of the rubber sleeve 13 is symmetrically formed with two protrusions 18, whose dimensions match the grooves 17, forming an axial fixation after assembly.

[0034] The inner wall of the bushing 3 is provided with an annular mounting groove 19, and a mounting ring 20 is embedded in the mounting groove 19. An elastic sealing ring 21 is nested in the inner wall of the mounting ring 20. The elastic sealing ring 21 abuts against the outer wall of the ball pin 4 to achieve a seal.

[0035] The inner wall of bushing 3 is machined with an annular mounting groove 19, and a stainless steel mounting ring 20 is press-fitted into the groove. The inner wall of mounting ring 20 is nested with a polytetrafluoroethylene-fluororubber composite sealing ring.

[0036] An annular sealing gasket 22 is pressed between the clamping seat 6 and the ball seat 2.

[0037] The top opening edge of the mounting hole 5 is provided with an outwardly expanding bevel 23, which is used to expand the deflection angle range of the ball pin 4 within the ball seat body 2.

[0038] The top opening edge of mounting hole 5 is machined with a 45° extended bevel 23.

[0039] In actual use, when the vehicle turns and the ball pin 4 rotates, the temperature inside the ball pin seat rises, and the spiral guide groove 10 generates a pumping effect, delivering lubricating oil from the oil reservoir 7 to the bushing 3. When the temperature exceeds 40°C, the paraffin melts and expands, squeezing the lubricating oil to replenish the gap in the bushing 3. Under vibration, the expanded graphite in the composite promotes oil circulation through elastic deformation. At the same time, when the vehicle operation causes the temperature of the oil reservoir 7 to rise, the air pressure inside the oil reservoir 7 increases, and the gas is discharged unidirectionally through the micropores of the breathable membrane, avoiding pressure accumulation that could damage the sealing structure. When the ambient temperature drops sharply or under high altitude and low air pressure conditions, a negative pressure is formed inside the oil reservoir 7, and external air slowly seeps in through the breathable membrane to compensate for the pressure, preventing the lubricating oil from flowing back due to the vacuum effect.

[0040] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A ball joint seat for an automotive steering system, comprising a housing, a ball joint body integrally formed with the housing, a bushing disposed within the ball joint body, and a ball joint with its bottom embedded within the bushing, characterized in that: The ball seat has a through mounting hole at its center. The bushing is located inside the mounting hole. A clamping seat is threaded to the bottom of the mounting hole. An oil storage cavity is located inside the clamping seat. Multiple drainage holes are evenly distributed around the bottom of the bushing. The two ends of the drainage holes connect the inside of the bushing to the oil storage cavity. The gap between the ball pin and the bushing is filled with lubricating oil. The drainage holes are used to guide the lubricating oil accumulated at the bottom gap of the bushing to the oil storage cavity for temporary storage.

2. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The oil storage cavity is filled with an expanded graphite-paraffin composite.

3. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The inner wall of the drainage hole is machined with a spiral guide groove.

4. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The oil storage chamber is equipped with a pressure balancing device.

5. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The ball seat body has several locking blocks on its top, the ball pin is wrapped with a rubber sleeve on its top, and the bottom of the rubber sleeve has a retaining ring. The locking blocks and the retaining ring engage to form a sealed and dustproof structure for the open end of the ball seat body.

6. The ball joint seat for an automotive steering system according to claim 5, characterized in that: The ball pin has an annular groove on its top outer side, and a limiting ring is symmetrically embedded in the groove. The limiting ring has a groove on its opposite side. The rubber sleeve has symmetrical protrusions on both sides of its top, and the protrusions are engaged in the grooves to achieve axial fixation between the rubber sleeve and the ball pin.

7. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The bushing has an annular mounting groove on its inner wall, in which a mounting ring is embedded. An elastic sealing ring is nested inside the mounting ring, and the elastic sealing ring abuts against the outer wall of the ball pin to achieve a seal.

8. The ball joint seat for an automotive steering system according to claim 1, characterized in that: An annular sealing gasket is pressed between the clamping seat and the ball seat body.

9. The ball joint seat for an automotive steering system according to claim 1, characterized in that: The top opening edge of the mounting hole is provided with an outwardly expanding bevel, which is used to increase the deflection angle range of the ball pin in the ball seat body.

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