Pinion type electric power steering gear

Abstract

The utility model discloses a pinion type electric power steering gear and relates to the technical field of automobile steering, one end of a sealing assembly is used for abutting against an automobile body, the other end of the sealing assembly is connected with a speed reduction shell, one end of an input shaft penetrates through the sealing assembly to enter the automobile body, and the other end of the input shaft is connected with a gear shaft; the speed reduction assembly is installed on the gear shaft, the speed reduction shell surrounds the peripheral wall of the speed reduction assembly, the gear shaft is sleeved with a bearing and a locking ring, the bearing abuts against the side, away from the sensor, of the speed reduction assembly, the locking ring is connected with the gear shaft in a fastened mode, and the locking ring makes contact with the inner ring of the side, away from the speed reduction assembly, of the bearing. The sealing assembly abuts against a vehicle body, external water and dust are prevented from entering the steering gear from the input shaft end, the speed reduction assembly is fixed into the speed reduction shell through the bearing and the locking ring, and the P-EPS steering gear assembly can bear the severe working environment of an engine compartment.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile steering, in particular to a pinion type electric power steering device. Background Art

[0002] With the development of automotive electronic technology, some cars have already used electric power steering, which has improved the economy, power and maneuverability of the car. EPS is a new generation of mechatronic intelligent power steering device. When the car turns under different vehicle conditions, the electronic controller controls the steering power motor to provide the required auxiliary power to achieve stable operation and easy steering, so that the driver has a good driving comfort. Since the P-EPS steering assembly is installed in the engine compartment, and the environment in the engine compartment is harsh, the P-EPS steering assembly has high requirements for high and low temperature resistance, moisture resistance, corrosion resistance and sealing. Utility Model Content

[0003] The utility model aims at the above problems and proposes a method to overcome at least one disadvantage.

[0004] The technical solution adopted by the utility model is as follows: a pinion type electric power steering gear, comprising a sealing assembly, an input shaft, a gear shaft, a sensor, a reduction assembly and a reduction housing, wherein one end of the sealing assembly is used to abut against the vehicle body, and the other end of the sealing assembly is connected to the reduction housing, one end of the input shaft passes through the sealing assembly to enter the vehicle body, and the other end of the input shaft is connected to the gear shaft, the sensor is installed at one end of the input shaft close to the gear shaft, the reduction assembly is installed on the gear shaft, the reduction housing is surrounded by the outer peripheral wall of the reduction assembly, the gear shaft sleeve is provided with a bearing and a locking ring, the bearing and the side of the reduction assembly facing away from the sensor abut against each other, the locking ring is tightly connected to the gear shaft, and the locking ring contacts the inner ring of the bearing on the side facing away from the reduction assembly.

[0005] Optionally, the reduction assembly includes a worm wheel, a worm and a motor, one end of the worm is meshed with the worm wheel, and the other end of the worm is connected to the motor, the gear shaft includes a smooth section and a threaded section integrally formed with the smooth section, the worm wheel, bearing, and locking ring are all sleeved on the outer peripheral wall of the smooth section, and the threaded section is meshed with a rack.

[0006] Optionally, the smooth section is provided with an annular groove for installing a locking ring, and the locking ring comprises a main body and an ear portion, and the ear portion is formed by radially symmetrical extension of the main body.

[0007] Optionally, the sealing assembly includes a sealing sleeve and a support frame, one end of the sealing sleeve is used to abut against the vehicle body, and the other end of the sealing sleeve is cooperatively connected with the support frame, the support frame is provided with a first through hole for the input shaft to pass through, the sealing sleeve is provided with a second through hole for the support frame to pass through, and a sealing surface is provided on a side of the sealing sleeve close to the vehicle body, the sealing sleeve is made of a flexible material, and the support frame is made of a rigid material.

[0008] Optionally, the sealing surface is provided with a plurality of annular protrusions at intervals along the circumferential direction, and the height of the sealing surface gradually decreases from the edge to the center.

[0009] Optionally, the sealing sleeve includes a second sealing member and a hollow first sealing member, the sealing surface is provided on the top of the first sealing member, a partition is provided inside the first sealing member, the partition separates the inside of the first sealing member into a first sealing cavity and a second sealing cavity, the second sealing member is located in the first sealing cavity, and the second sealing member is provided with the second through hole.

[0010] Optionally, the support frame includes a first support part, a second support part and a third support part, one end of the first support part cooperates with the second through hole, the other end of the first support part is connected to the second support part, the first support part is provided with the first through hole, the first through hole passes through the second support part, the second support part is detachably connected to the reduction housing, the third support part is arranged on the outer peripheral wall of the first support part close to one end of the support frame, and the third support part cooperates with the second sealing cavity.

[0011] Optionally, the second support portion is provided with a cavity for accommodating the sensor, the first through hole is connected to the cavity, the inner wall of the cavity is provided with a groove for cooperating with the sensor bracket, and the second support portion is provided with a plurality of protrusions connected to the reduction housing along the circumferential direction, and the protrusions are provided with screw holes for screws to pass through.

[0012] Optionally, it also includes a torsion bar, one end of which is located inside the input shaft, and the other end of the torsion bar is located inside the gear shaft, the input shaft is provided with an inner hole for installing the torsion bar, and the end of the input shaft is provided with an exhaust hole connected to the inner hole.

[0013] The beneficial effects of the utility model are as follows: the sealing component abuts against the vehicle body to prevent external water and dust from entering the interior of the steering gear from the input shaft end, which would have adverse effects on the input shaft and the sensor; the bearing and the locking ring fix the reduction assembly inside the reduction housing to prevent water and dust from entering the interior of the steering gear from the gear shaft end, so that the P-EPS steering gear assembly has good dustproof and waterproof performance, thereby enabling the P-EPS steering gear assembly to withstand the harsh working environment of the engine compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A cross-sectional view of a pinion-type electric power steering device according to an embodiment of the utility model;

[0015] Figure 2 A schematic diagram of the structure of a pinion-type electric power steering device proposed in an embodiment of the utility model;

[0016] Figure 3 An exploded view of a sealing assembly of a pinion-type electric power steering device provided in an embodiment of the utility model;

[0017] Figure 4 This is an exploded bottom view of the sealing assembly of the pinion-type electric power steering device provided in an embodiment of the utility model.

[0018] Figure 5 A schematic diagram of a locking ring of a pinion-type electric power steering device proposed in an embodiment of the utility model.

[0019] The marks in the accompanying drawings are: 1. sealing sleeve; 11. first sealing member; 111. sealing surface; 112. annular convexity; 113. partition; 114. first sealing cavity; 115. second sealing cavity; 1151. annular groove; 12. second sealing member; 121. second through hole; 2. support frame; 21. first supporting part; 211. first through hole; 22. second supporting part; 221. groove; 222. convexity; 223. sealing ring; 23. third supporting part; 3. input shaft; 4. gear shaft; 41. smooth section; 42. threaded section; 5. sensor; 6. reduction housing; 7. reduction assembly; 71. worm wheel; 72. worm; 73. motor; 8. bearing; 9. locking ring; 91. main body; 92. ear; 10. torsion bar. DETAILED DESCRIPTION

[0020] The utility model is described in detail below in conjunction with the accompanying drawings.

[0021] like Figures 1 to 5As shown, a pinion type electric power steering device includes a sealing assembly, an input shaft 3, a gear shaft 4, a sensor 5, a reduction assembly 7 and a reduction housing 6, one end of the sealing assembly is used to abut against the vehicle body, and the other end of the sealing assembly is connected to the reduction housing 6, one end of the input shaft 3 passes through the sealing assembly to enter the vehicle body, and the other end of the input shaft 3 is connected to the gear shaft 4, the sensor 5 is installed at one end of the input shaft 3 close to the gear shaft 4, the reduction assembly 7 is installed on the gear shaft 4, the reduction housing 6 is surrounded by the outer peripheral wall of the reduction assembly 7, the gear shaft 4 is sleeved with a bearing 8 and a locking ring 9, the bearing 8 and the side of the reduction assembly 7 facing away from the sensor 5 abut against each other, the locking ring 9 is tightly connected to the gear shaft 4, and the locking ring 9 contacts the inner ring of the bearing 8 facing away from the reduction assembly 7. The sealing assembly is against the vehicle body to prevent external water and dust from entering the steering gear from the end of the input shaft 3 and causing adverse effects on the input shaft 3 and the sensor 5. The bearing 8 and the locking ring 9 fix the reduction assembly 7 inside the reduction housing 6 to prevent water and dust from entering the steering gear from the end of the gear shaft 4, so that the P-EPS steering gear assembly has good dust and water resistance, thereby enabling the P-EPS steering gear assembly to withstand the harsh working environment of the engine compartment.

[0022] In this embodiment, if Figure 1 and 2 As shown, the reduction assembly 7 includes a worm wheel 71, a worm 72 and a motor 73. One end of the worm 72 is meshed with the worm wheel 71, and the other end of the worm 72 is connected to the motor 73. The gear shaft 4 includes a smooth section 41 and a threaded section 42 integrally formed with the smooth section 41. The worm wheel 71, the bearing 8, and the locking ring 9 are all sleeved on the outer peripheral wall of the smooth section 41, and the threaded section 42 is meshed with a rack. The motor 73 applies power to the gear shaft 4 through the worm 72 and the worm wheel 71, so that the threaded section 42 drives the rack to reciprocate. This is the prior art.

[0023] In this embodiment, if Figure 5 As shown, the smooth section 41 is provided with an annular groove 1151 for installing the locking ring 9, and the locking ring 9 includes a main body 91 and an ear 92, and the ear 92 is formed by radially symmetrical extension of the main body 91. In this embodiment, there are four ears 92, and the locking ring 9 and the gear shaft 4 are radially riveted at four points. When riveting, the rivet heads are aligned with the ears 92, and the rivet heads are symmetrically distributed. The force is uniform during riveting, and after riveting, the locking ring 9 and the inner groove of the gear shaft 4 have a large contact area, which plays a good role in preventing loosening.

[0024] In this embodiment, if Figure 1-4As shown, the sealing assembly includes a sealing sleeve 1 and a support frame 2, one end of the sealing sleeve 1 is used to abut against the vehicle body, and the other end of the sealing sleeve 1 is connected with the support frame 2, the support frame 2 is provided with a first through hole 211 for the input shaft 3 to pass through, the sealing sleeve 1 is provided with a second through hole 121 for the support frame 2 to pass through, and the sealing sleeve 1 is provided with a sealing surface 111 on the side close to the vehicle body, the sealing sleeve 1 is made of a flexible material, and the support frame 2 is made of a rigid material. During installation, the sealing sleeve 1 and the chassis of the vehicle are pressed against each other, and the sealing surface 111 is compressed to achieve a sealing and waterproof effect, that is, to prevent water and dust from entering the first through hole 211 and the second through hole 121 from the outside, and also ensure the air permeability inside the steering gear, and the rigid support frame 2 plays a good supporting role for the input shaft 3.

[0025] In this embodiment, if Figure 1-4 As shown, the sealing surface 111 is provided with a plurality of annular protrusions 112 at intervals along the circumferential direction, and the height of the sealing surface 111 gradually decreases from the edge to the center, so that a better sealing effect is formed between the sealing surface 111 and the chassis of the automobile.

[0026] In this embodiment, if Figure 3 and 4 As shown, the sealing sleeve 1 includes a second sealing member 12 and a hollow first sealing member 11. The sealing surface 111 is provided on the top of the first sealing member 11. A partition 113 is provided inside the first sealing member 11. The partition 113 divides the inside of the first sealing member 11 into a first sealing cavity 114 and a second sealing cavity 115. The second sealing member 12 is located in the first sealing cavity 114. The second sealing member 12 is provided with a second through hole 121. The sealing surface 111, the first sealing member 11, and the partition 113 are integrally formed. The second sealing member 12 supports the first sealing cavity 114 to prevent the sealing surface 111 from deforming during extrusion and affecting the sealing effect. The first sealing member 11 and the second sealing member 12 are both made of rubber, which has a good waterproof and noise-proof effect.

[0027] In this embodiment, if Figure 3 and 4As shown, the support frame 2 includes a first support portion 21, a second support portion 22 and a third support portion 23, one end of the first support portion 21 cooperates with the second through hole 121, the other end of the first support portion 21 is connected to the second support portion 22, the first support portion 21 is provided with the first through hole 211, the first through hole 211 penetrates the second support portion 22, the second support portion 22 is detachably connected to the reduction housing 6, the third support portion 23 is arranged on the outer peripheral wall of the first support portion 21 close to one end of the support frame 2, and the third support portion 23 cooperates with the second sealing cavity 115. The first support portion 21, the second support portion 22 and the third support portion 23 are integrally formed, and the third support portion 23 increases the support area for the sealing sleeve 1 to prevent the sealing sleeve 1 from deforming during extrusion.

[0028] In this embodiment, if Figure 3 As shown, the second support portion 22 is provided with a cavity for accommodating the sensor 5, the first through hole 211 is connected to the cavity, the inner wall of the cavity is provided with a groove 221 for cooperating with the sensor 5 bracket, the second support portion 22 is provided with a plurality of protrusions 222 connected to the reduction housing 6 along the circumferential direction, and the protrusions 222 are provided with screw holes for screws to pass through.

[0029] In this embodiment, if Figure 1 As shown, it also includes a torsion bar 10, one end of which is located inside the input shaft 3, and the other end of which is located inside the gear shaft 4. The input shaft 3 is provided with an inner hole for installing the torsion bar 10, and the end of the input shaft 3 is provided with an exhaust hole connected to the inner hole. The torsion bar 10 and the input shaft 3 have internal clearance fit, and an O-ring is provided between the torsion bar 10 and the input shaft 3. After the torsion bar 10 is installed in the input shaft 3, the air pressure is discharged through the exhaust hole to prevent the air pressure inside the input shaft 3 from being too high, so that the input shaft 3 and the torsion bar 10 cannot be assembled properly when pinning.

[0030] The above description is only a preferred embodiment of the utility model, and does not limit the patent protection scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the utility model.

Claims

1. A pinion type electric power steering gear, characterized in that: It includes a sealing assembly, an input shaft, a gear shaft, a sensor, a reduction assembly and a reduction housing, one end of the sealing assembly is used to abut against the vehicle body, and the other end of the sealing assembly is connected to the reduction housing, one end of the input shaft passes through the sealing assembly and enters the vehicle body, and the other end of the input shaft is connected to the gear shaft, the sensor is installed at one end of the input shaft close to the gear shaft, the reduction assembly is installed on the gear shaft, the reduction housing is surrounded by the outer peripheral wall of the reduction assembly, the gear shaft sleeve is provided with a bearing and a locking ring, the bearing and the side of the reduction assembly facing away from the sensor abut against each other, the locking ring is tightly connected to the gear shaft, and the locking ring is in contact with the inner ring of the bearing on the side facing away from the reduction assembly.

2. The pinion type electric power steering device according to claim 1, characterized in that: The reduction assembly includes a worm wheel, a worm and a motor. One end of the worm is meshed with the worm wheel, and the other end of the worm is connected to the motor. The gear shaft includes a smooth section and a threaded section integrally formed with the smooth section. The worm wheel, bearing and locking ring are all sleeved on the outer peripheral wall of the smooth section, and the threaded section is meshed with a rack.

3. The pinion type electric power steering device according to claim 2, characterized in that: The smooth section is provided with an annular groove for installing a locking ring. The locking ring comprises a main body and an ear portion. The ear portion is formed by radially symmetrical extension of the main body.

4. The pinion type electric power steering device according to claim 1, characterized in that: The sealing assembly includes a sealing sleeve and a support frame, one end of the sealing sleeve is used to abut against the vehicle body, and the other end of the sealing sleeve is cooperatively connected with the support frame, the support frame is provided with a first through hole for the input shaft to pass through, the sealing sleeve is provided with a second through hole for the support frame to pass through, and a sealing surface is provided on a side of the sealing sleeve close to the vehicle body, the sealing sleeve is made of a flexible material, and the support frame is made of a rigid material.

5. The pinion type electric power steering device according to claim 4, characterized in that: The sealing surface is provided with a plurality of annular protrusions at intervals along the circumferential direction, and the height of the sealing surface gradually decreases from the edge to the center.

6. The pinion type electric power steering device according to claim 4, characterized in that: The sealing sleeve includes a second sealing member and a hollow first sealing member, the sealing surface is provided on the top of the first sealing member, a partition is provided inside the first sealing member, the partition separates the inside of the first sealing member into a first sealing cavity and a second sealing cavity, the second sealing member is located in the first sealing cavity, and the second sealing member is provided with the second through hole.

7. The pinion type electric power steering device according to claim 6, characterized in that: The support frame includes a first support part, a second support part and a third support part, one end of the first support part cooperates with the second through hole, the other end of the first support part is connected to the second support part, the first support part is provided with the first through hole, the first through hole passes through the second support part, the second support part is detachably connected to the reduction housing, the third support part is arranged on the outer peripheral wall of the first support part close to one end of the support frame, and the third support part cooperates with the second sealing cavity.

8. The pinion type electric power steering device according to claim 7, characterized in that: The second support portion is provided with a cavity for accommodating the sensor, the first through hole is connected to the cavity, the inner wall of the cavity is provided with a groove for cooperating with the sensor bracket, the second support portion is provided with a plurality of protrusions connected to the reduction housing along the circumferential direction, and the protrusions are provided with screw holes for screws to pass through.

9. The pinion type electric power steering device according to claim 1, characterized in that: It also includes a torsion bar, one end of which is located inside the input shaft, and the other end of which is located inside the gear shaft. The input shaft is provided with an inner hole for installing the torsion bar, and the end of the input shaft is provided with an exhaust hole connected to the inner hole.

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