A method for installing a rotation angle sensor

Abstract

The invention belongs to the technical field of unmanned driving, and specifically relates to a method for installing an angle sensor, comprising the following installation steps: step 1: pre-installing bearings, and installing the bearings in an upper end cover, between the connection between the bottom of a reducer housing and the top of a steering gear housing, and on the inner bottom surface of the steering gear housing; step 2: installing an angle sensor assembly, and installing the angle sensor assembly inside a cavity formed by the upper end cover, the reducer housing, and the steering gear housing, so that a worm wheel on a gear shaft is meshed with a worm in the reducer housing, and the gear shaft is meshed with a rack shaft in the steering gear housing; step 3: after assembling step 1 and step 2, the housing assembly is fastened and installed; through the invention, the problem that an angle sensor cannot be arranged due to the absence of a cab, a steering wheel, and a steering column in an unmanned driving steering system is solved, the installation method is simple to install, and can accurately record the angle and angular velocity of gear rotation in a rack-and-pinion steering system.

Description

Technical Field

[0001] The invention belongs to the technical field of unmanned driving, and in particular relates to a method for installing a rotation angle sensor. Background Art

[0002] With the development of automotive electronic systems, the corner signal is becoming more and more critical to the control of the car. More and more systems need to use the corner signal, such as electronic stability control system, adaptive cruise control system, and wire-controlled steering system. Its accuracy and stability are directly related to the steering performance and driving safety. In the past, the car's corner sensor was installed on the steering column, following the rotation of the steering column to collect the corner signal, but with the gradual intelligence of the car chassis, the application of wire-controlled steering has become more and more widespread. Different from the previous steering system, the wire-controlled steering removes the traditional steering wheel and steering column, so the angle sensor can only be installed inside the steering gear. The previous sensor installation method is no longer applicable, and the installation method is complicated and costly, so a new angle sensor installation method is needed. Summary of the invention

[0003] In view of the defects of the prior art, the present invention proposes a method for installing a steering angle sensor to solve the problem that the steering-by-wire system in an unmanned driving vehicle has no cab, no steering wheel, and no steering column, which makes it impossible to arrange the steering angle sensor. The installation method is easy to install, simple and stable, and can accurately record the angle and angular speed of gear rotation in rack and pinion steering.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention provides a method for installing an angle sensor, wherein the angle sensor installation structure involved in the method for installing an angle sensor includes a gear shaft and an angle sensor, and the housing assembly includes an upper end cover, a reducer housing, a steering gear housing, a rack shaft, a worm wheel and a worm; the angle sensor is installed on the gear shaft for rotation connection; the upper end cover is installed on the top of the reducer housing, and the steering gear housing is fixedly installed on the bottom of the reducer housing, the upper end cover, the reducer housing and the steering gear housing form a cavity, the angle sensor assembly is installed inside the cavity, and a groove is provided on the inner side of the reducer housing to fix the angle sensor assembly; the rack shaft is installed on the steering gear housing, and the rack shaft is meshed with the gear shaft; the worm wheel is installed on the gear shaft, and the worm is installed in the reduction mechanism of the reducer housing;

[0005] The installation steps include:

[0006] Step 1: pre-install bearings, and install the bearings in the upper end cover, between the connection between the bottom of the reducer housing and the top of the steering gear housing, and on the inner bottom surface of the steering gear housing;

[0007] Step 2: Install the rotation angle sensor assembly, install the rotation angle sensor assembly inside the cavity composed of the upper end cover, the reducer housing and the steering gear housing, make the worm wheel on the gear shaft mesh with the worm in the reducer housing, and make the gear shaft mesh with the rack shaft in the steering gear housing;

[0008] Step 3: After the assembly of step 1 and step 2 is completed, the housing assembly is fastened and installed;

[0009] The housing assembly further includes a deep groove ball bearing, an intermediate bearing and a needle roller bearing; the pre-installed bearing in step 1 specifically includes:

[0010] Install the deep groove ball bearing into the inner top surface of the upper end cover, install the intermediate bearing into the intermediate bearing installation groove between the bottom of the reducer housing and the top connection of the steering gear housing, and install the needle roller bearing into the inner bottom surface of the steering gear housing to complete the pre-assembly operation;

[0011] The rotation angle sensor assembly includes a shaft elastic retaining ring; the gear shaft includes a vertical groove; the rotation angle sensor includes a rotation angle sensor limit block, a rotation angle sensor harness interface, a rotation angle sensor harness, a first tooth-shaped boss, a second tooth-shaped boss and a gear assembly;

[0012] The shaft is installed on the gear shaft with an elastic retaining ring and fits with the top of the rotation angle sensor; the large gear of the gear assembly is rotatably connected to the body of the rotation angle sensor around its axis, and the first tooth-shaped boss is provided on the inner ring surface of the large gear of the gear assembly; the vertical grooves are provided with two and are symmetrically arranged on the gear shaft; the first tooth-shaped boss is matched and connected with the vertical groove; the second tooth-shaped boss is provided on the outer side of the body of the rotation angle sensor, and the second tooth-shaped boss is fixedly installed with the rotation angle sensor limit block, and the rotation angle sensor limit block is fixedly installed in the groove on the inner side of the reducer housing;

[0013] The angle sensor wiring harness interface is arranged on the body of the angle sensor, one end of the angle sensor wiring harness is connected to the external controller, and the other end passes through the through hole on the reducer housing and is connected to the angle sensor wiring harness interface; a sealing ring is provided on the angle sensor wiring harness, and the sealing ring is stuck in the through hole on the reducer housing.

[0014] The step 2 of installing the rotation angle sensor assembly specifically includes:

[0015] Step 2.1: Install the worm gear to the worm gear mounting position on the gear shaft, then align the gear assembly with the top of the gear shaft, and insert the gear assembly from the top of the gear shaft, so that the first tooth-shaped boss on the rotation angle sensor is matched with the vertical groove on the gear shaft, so that the gear assembly rotates together with the gear shaft;

[0016] Step 2.2: Use the shaft elastic retaining ring to clamp the groove pre-machined on the gear shaft to achieve axial positioning of the rotation angle sensor on the gear shaft; then align the gear shaft with the pre-installed intermediate bearing and install it into the reducer housing. When installing, the second tooth-shaped boss needs to be aligned and installed into the groove of the rotation angle sensor limit block pre-machined on the inner side of the reducer housing; finally, install the rotation angle sensor limit block and fix the rotation angle sensor limit block to the reducer housing;

[0017] Step 2.3: Connect one end of the angle sensor harness to the external controller, and pass the other end through the through hole on the reducer housing to enter the interior of the reducer housing, clamp the sealing ring on the angle sensor harness into the through hole, and plug the angle sensor harness into the angle sensor harness interface to complete the assembly of the angle sensor assembly.

[0018] Further, the housing assembly also includes a housing connecting bolt, a first O-ring, a second O-ring, a locking nut, a vent valve and a first O-ring mounting groove;

[0019] The housing assembly in step 3 is fastened and installed, specifically including:

[0020] Step 3.1: First, put the locking nut on the gear shaft, and lock the locking nut through the hexagon socket on the upper end of the gear shaft. At this time, the gear shaft with the rotation angle sensor is completely fixed in the reducer housing;

[0021] Step 3.2: Then, place the first O-ring into the first O-ring installation groove on the top surface of the reducer housing, press the upper end cover pre-installed with the deep groove ball bearing against the top surface of the reducer housing, so that the top of the gear shaft penetrates the deep groove ball bearing, insert the rack shaft into the steering gear housing, place the second O-ring into the second O-ring installation groove on the top surface of the steering gear housing, press the steering gear housing pre-installed with the needle roller bearing against the bottom surface of the reducer housing, so that the bottom of the gear shaft penetrates the needle roller bearing, and the gear shaft meshes with the rack shaft in the steering gear housing;

[0022] Step 3.3: Finally, pass the housing connecting bolts through the mounting holes of the upper end cover and the mounting holes of the reducer housing in sequence, fix them with the mounting holes of the steering gear housing, tighten the torque, and install the vent valve to the vent valve mounting port provided on one side of the steering gear housing to complete the fastening installation of the housing assembly.

[0023] Furthermore, when the rotation angle sensor is disassembled for maintenance, the housing connecting bolts are loosened, the upper end cover is removed from the reducer housing, the shaft is removed from the gear shaft with an elastic retaining ring, and the rotation angle sensor is removed from the gear shaft.

[0024] Furthermore, the gear shaft is provided with five steps, and the steps at the upper and lower ends and the middle position of the gear shaft are provided with bearing positions;

[0025] The upper step of the gear shaft is mounted in cooperation with the deep groove ball bearing, the lower step of the gear shaft is mounted in cooperation with the needle bearing, and the middle step of the gear shaft is mounted in cooperation with the intermediate bearing;

[0026] The deep groove ball bearing, the intermediate bearing and the needle roller bearing are coaxial;

[0027] The rotation angle sensor is installed on a step between the intermediate bearing and the deep groove ball bearing;

[0028] The worm gear is located on a step between the rotation angle sensor and the intermediate bearing;

[0029] A gear is provided on the gear shaft in an area between the intermediate bearing and the needle bearing, and the gear is meshed with the rack shaft.

[0030] Furthermore, the first O-ring is installed on the top surface of the reducer housing, and the second O-ring is installed on the top surface of the steering gear housing.

[0031] Further, the locking nut is mounted on the gear shaft, and the locking nut is locked by the hexagon socket on the upper end of the gear shaft;

[0032] The housing connecting bolts are sequentially passed through the mounting holes of the upper end cover, the reducer housing and the steering gear housing for fixing.

[0033] A passage penetrating the internal cavity is provided on one side of the steering gear housing, and the vent valve is installed outside the passage opening.

[0034] The beneficial effects of the present invention are:

[0035] First, the angle sensor installation method of the present invention adopts the angle sensor assembly and the housing assembly installation structure, the angle sensor assembly is installed inside the housing assembly, a gear shaft is used through the angle sensor assembly, the gear shaft is assembled in the reducer housing, the angle sensor and the turbine are installed on the gear shaft, the body of the angle sensor is fixed in the reducer housing, the gear assembly of the angle sensor and the gear shaft rotate synchronously, the wiring harness of the angle sensor enters the reducer housing from the external controller end, and is plugged into the wiring harness interface on the angle sensor, and a gear is provided on the gear shaft. The gear teeth of the gear shaft mesh with the rack shaft on the steering gear housing, the worm on the reducer of the housing assembly meshes with the turbine on the gear shaft, the motor drives the worm turbine to rotate, the turbine drives the gear shaft to rotate, and the gear shaft drives the rack shaft to do reciprocating linear motion. The installation structure is simple and the installation method is convenient. The angle sensor harness connection can realize the transmission of the angle signal, accurately record the angle and angular speed of the gear rotation in the rack and pinion steering, and solve the problem that the angle sensor cannot be arranged in the unmanned driving wire control steering system without a cab, steering wheel, and steering column;

[0036] Second, the rotation angle sensor installation method of the present invention utilizes a shaft elastic retaining ring to be installed on the gear shaft, and fits with the top of the rotation angle sensor to fix the axial position of the rotation angle sensor assembly, and the upper end cover of the housing assembly is used to close the top surface of the reducer housing. When the rotation angle sensor needs to be disassembled and repaired, the upper end cover is removed from the reducer housing, and the shaft elastic retaining ring is removed from the gear shaft, and the rotation angle sensor can be removed from the gear shaft. This disassembly and assembly method will not cause damage to the gear shaft, and at the same time, the disassembly is simple, saving work time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A cross-sectional view of the installation structure of an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of the overall structure of a rotation angle sensor assembly according to an embodiment of the present invention;

[0039] Figure 3 A top view of the installation structure of an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the structure of the rotation angle sensor according to an embodiment of the present invention.

[0041] Among them, 1-angle sensor assembly; 10-gear shaft; 100-vertical groove; 11-elastic retaining ring for shaft; 12-angle sensor; 120-angle sensor limit block; 121-angle sensor wiring harness interface; 122-angle sensor wiring harness; 123-first tooth-shaped boss; 124-second tooth-shaped boss; 2-housing assembly; 200-deep groove ball bearing; 201-upper end cover; 202-housing connecting bolt; 203-first O-ring; 204-reducer housing; 205-intermediate bearing; 206-second O-ring; 207-steering gear housing; 208-rack shaft; 209-needle bearing; 210-locking nut; 211-vent valve; 212-worm wheel; 213-worm; 214-first O-ring mounting groove. DETAILED DESCRIPTION

[0042] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0044] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention provides a method for installing a rotation angle sensor. The installation structure involved includes a rotation angle sensor assembly 1 and a housing assembly 2. The rotation angle sensor assembly 1 is installed in the housing assembly 2.

[0045] The housing assembly 2 includes a deep groove ball bearing 200, an upper end cover 201, housing connecting bolts 202, a first O-ring 203, a reducer housing 204, an intermediate bearing 205, a second O-ring 206, a steering gear housing 207, a needle bearing 209, a ventilation valve 211 and a first O-ring mounting groove 214.

[0046] A first O-ring mounting groove 214 is provided on the top surface of the reducer housing 204 for mounting the first O-ring 203. A second O-ring mounting groove is provided on the top surface of the steering gear housing 207 for mounting the second O-ring 206. The housing connecting bolts 202 pass through the upper end cover 201, the reducer housing 204 and the steering gear housing 207 in sequence to be connected and fixed. The bottom surface of the upper end cover 201 presses the top of the reducer housing 204, and the top surface of the steering gear housing 207 presses the bottom surface of the reducer housing 204, thereby achieving a waterproof effect inside the housing assembly 2.

[0047] The upper end cover 201 is used to close the top of the reducer housing 204. The interior of the reducer housing 204 is connected to the interior of the steering gear housing 207 for installing the angle sensor assembly 1. A groove is provided on the inner side of the reducer housing 204 for fixing the angle sensor assembly 1.

[0048] A passage penetrating the internal cavity is provided on one side of the steering gear housing 207 , and a vent valve 211 is installed outside the passage opening. The vent valve 211 is used to exchange gas with the outside to maintain the balance of internal and external air pressures.

[0049] A deep groove ball bearing 200 is installed on the inner top surface of the upper end cover 201, and an intermediate bearing 205 installation groove is provided at the connection between the bottom of the reducer housing 204 and the top of the steering gear housing 207 for installing the intermediate bearing 205. A needle roller bearing 209 is installed on the inner bottom surface of the steering gear housing 207, and the deep groove ball bearing 200, the intermediate bearing 205 and the needle roller bearing 209 are coaxial.

[0050] The rotation angle sensor assembly 1 includes a gear shaft 10 , a shaft elastic retaining ring 11 and a rotation angle sensor 12 .

[0051] The gear shaft 10 includes a vertical groove 100. Two vertical grooves 100 are provided and symmetrically arranged on the gear shaft 10 rod for fixing the rotation angle sensor 12.

[0052] The shaft elastic circlip 11 is installed on the gear shaft 10 and fits with the top of the rotation angle sensor 12 to fix the axial position of the rotation angle sensor assembly 1.

[0053] The gear shaft 10 is provided with five steps, and the steps at the upper and lower ends and the middle position of the gear shaft 10 are provided with bearing positions. The upper step of the gear shaft 10 is installed in cooperation with the deep groove ball bearing 200, the lower step of the gear shaft 10 is installed in cooperation with the needle bearing 209, and the middle step of the gear shaft 10 is installed in cooperation with the intermediate bearing 205. A rotation angle sensor 12 is installed on a step between the intermediate bearing 205 and the deep groove ball bearing 200, and two vertical grooves 100 are symmetrically provided at the position where the rotation angle sensor 12 is installed, and the two vertical grooves 100 are used to fix the rotation angle sensor 12. A gear is provided in the area between the intermediate bearing 205 and the needle bearing 209 on the gear shaft 10.

[0054] The rotation angle sensor 12 includes a rotation angle sensor limit block 120, a rotation angle sensor harness interface 121, a rotation angle sensor harness 122, a first tooth-shaped boss 123, a second tooth-shaped boss 124 and a gear assembly.

[0055] The large gear of the gear assembly is rotatable around its axis and is clamped on the body of the angle sensor 12. A first tooth-shaped boss 123 is provided on the inner ring surface of the large gear of the gear assembly, which is used to be installed and fixed with the vertical groove 100 on the gear shaft 10, so as to realize the synchronous rotation of the angle sensor 12 and the gear shaft 10; a second tooth-shaped boss 124 is provided on the outer side of the body of the angle sensor 12, which is used to be installed and fixed with the angle sensor limit block 120. The angle sensor limit block 120 is fixedly installed in the groove on the inner side of the reducer housing 204.

[0056] The steering angle sensor harness interface 121 is arranged on the body of the steering angle sensor 12; one end of the steering angle sensor harness 122 is connected to the external controller, and the other end passes through the through hole on the reducer housing 204 and is connected to the steering angle sensor harness interface 121 to realize the transmission of the steering angle signal, and can accurately record the angle and angular velocity of the gear rotation in the rack and pinion steering; a sealing ring is provided on the steering angle sensor harness 122, which is inserted into the through hole on the reducer housing 204 to realize the sealing and waterproofing of the steering angle sensor harness 122.

[0057] The housing assembly 2 further includes a rack shaft 208 , a locking nut 210 , a worm wheel 212 and a worm 213 .

[0058] The worm 213 is installed in the reduction mechanism of the reducer housing 204, and the worm wheel 212 is installed on the gear shaft 10 with an interference fit and is located on the step between the rotation angle sensor 12 and the intermediate bearing 205. The worm wheel 212 and the worm 213 are meshed to achieve deceleration and torque increase of the reduction mechanism.

[0059] The locking nut 210 is put on the gear shaft 10, and the nut is locked by the hexagon socket on the upper end of the gear shaft 10. At this time, the gear shaft 10 with the rotation angle sensor 12 is completely fixed.

[0060] The rack shaft 208 is mounted on the steering gear housing 207 , and the rack shaft 208 is meshed with the gear shaft 10 . When the gear shaft 10 rotates, the rack shaft 208 on the steering gear housing 207 is driven to perform linear motion.

[0061] The installation structure involved in a method for installing an angle sensor of the present embodiment is that the worm 213 of the reducer is driven by a motor to rotate, and the torque is transmitted to the steering gear through the deceleration and torque increase of the reducer. The worm 213 drives the turbine to rotate, and then drives the gear shaft 10 to rotate. The gear shaft 10 is meshed with the rack shaft 208 on the steering gear housing 207, and the rack shaft 208 performs reciprocating linear motion. Its motion pair structure is not limited to the gear rack type, and can be a worm 213 crank pin type, a circulating ball type, a worm 213 worm wheel 212 type, etc.

[0062] A rotation angle sensor installation method provided in this embodiment includes:

[0063] Step 1: Pre-install the deep groove ball bearing 200, the intermediate bearing 205 and the needle bearing 209. Install the deep groove ball bearing 200 into the upper end cover 201, install the intermediate bearing 205 into the intermediate bearing 205 installation groove between the bottom of the reducer housing 204 and the top connection of the steering gear housing 207, and install the needle bearing 209 into the inner bottom surface of the steering gear housing 207 to complete the pre-assembly operation.

[0064] Step 2: Install the steering angle sensor assembly 1.

[0065] Step 2.1: First, install the worm gear 212 to the worm gear 212 installation position on the gear shaft 10, then align the gear assembly on the angle sensor 12 with the top of the gear shaft 10, and insert it from the top of the gear shaft 10, so that the first tooth-shaped boss 123 on the angle sensor 12 is matched and connected with the vertical groove 100 on the gear shaft 10, so that the gear assembly on the angle sensor 12 rotates with the gear shaft 10.

[0066] Step 2.2: Then use the shaft elastic retaining ring 11 to clamp the pre-machined groove on the gear shaft 10 to achieve axial positioning of the angle sensor 12 on the gear shaft 10; then align the gear shaft 10 with the angle sensor 12 with the pre-installed intermediate bearing 205, and install it into the reducer housing 204. When installing, it is necessary to align the second tooth-shaped boss 124 on the angle sensor 12 and install it into the groove of the angle sensor limit block 120 pre-machined on the inner side of the reducer housing 204.

[0067] Step 2.3: Finally, install the angle sensor limit block 120 and fix the angle sensor limit block 120 and the reducer housing 204 together; finally, connect one end of the angle sensor harness 123 to the external controller, and pass the other end through the through hole on the reducer housing 204 to enter the interior of the reducer housing 204, clamp the sealing ring on the angle sensor harness 123 to the through hole, and plug the angle sensor harness 123 into the angle sensor harness interface 122 to complete the assembly of the angle sensor assembly 1.

[0068] Step 3: After the rotation angle sensor assembly 1 is assembled, tighten and install the housing assembly 2.

[0069] Step 3.1: First, put the locking nut 210 onto the gear shaft 10 , and lock the nut through the hexagon socket on the upper end of the gear shaft 10 . At this time, the gear shaft 10 with the rotation angle sensor 12 is completely fixed in the reducer housing 204 .

[0070] Step 3.2: Then put the first O-ring 203 into the first O-ring installation groove 214 on the top surface of the reducer housing 204, press the upper end cover 201 pre-installed with the deep groove ball bearing 200 against the top surface of the reducer housing 204, so that the top part of the gear shaft 10 penetrates into the deep groove ball bearing 200, insert the rack shaft 208 into the steering gear housing 207, put the second O-ring 206 into the second O-ring installation groove on the top surface of the steering gear housing 207, press the steering gear housing 207 pre-installed with the needle bearing 209 against the bottom surface of the reducer housing 204, so that the bottom of the gear shaft 10 penetrates into the needle bearing 209, and the gear shaft 10 is meshed with the rack shaft 208 in the steering gear housing 207.

[0071] Step 3.3: Finally, pass the housing connecting bolts 202 through the mounting holes of the upper end cover 201 and the mounting holes of the reducer housing 204 in sequence, fix them with the mounting holes of the steering gear housing 207, tighten the torque, and install the vent valve 211 on the vent valve 211 mounting port provided on one side of the steering gear housing 207 to complete the fastening installation of the housing assembly 2.

[0072] The present invention utilizes a shaft elastic retaining ring to be installed on the gear shaft, and fits with the top of the angle sensor to fix the axial position of the angle sensor assembly, and the upper end cover of the housing assembly is used to close the top surface of the reducer housing. When the angle sensor needs to be disassembled and repaired, the upper end cover is removed from the reducer housing, and the shaft elastic retaining ring is removed from the gear shaft, and the angle sensor can be removed from the gear shaft. This disassembly and assembly method will not cause damage to the gear shaft, and at the same time, the disassembly is simple, saving work time and labor costs.

[0073] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The shapes of various components in the drawings are schematic, and certain differences from their actual shapes are not excluded. The drawings are only used to illustrate the principles of the present invention and are not intended to limit the present invention.

[0075] Although the present invention is disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the present invention. The scope of protection of the present invention is defined by the appended claims and may include various modifications, alterations and equivalents made to the invention without departing from the scope and spirit of the present invention.

Claims

1. A method for installing a rotation angle sensor, wherein the rotation angle sensor installation structure involved in the method comprises a rotation angle sensor assembly (1) and a housing assembly (2); wherein: The rotation angle sensor assembly (1) comprises a gear shaft (10) and a rotation angle sensor (12); the housing assembly (2) comprises an upper end cover (201), a reducer housing (204), a steering gear housing (207), a rack shaft (208), a worm wheel (212) and a worm (213); the rotation angle sensor (12) is mounted on the gear shaft (10) for rotation connection; the upper end cover (201) is mounted on the top of the reducer housing (204); the steering gear housing (207) is fixedly mounted on the bottom of the reducer housing (204); the upper end cover (201), the reducer housing (204) and the steering gear housing (207) are fixedly mounted on the bottom of the reducer housing (204); The reducer housing (204) and the steering gear housing (207) form a cavity, the rotation angle sensor assembly (1) is installed inside the cavity, the inner side of the reducer housing (204) is provided with a groove to fix the rotation angle sensor assembly (1); the rack shaft (208) is installed on the steering gear housing (207), and the rack shaft (208) is meshingly connected with the gear shaft (10); the worm wheel (212) is installed on the gear shaft (10), and the worm (213) is installed in the reduction mechanism of the reducer housing (204); the installation steps are characterized in that: Step 1: pre-install bearings, and install the bearings in the upper end cover (201), between the connection between the bottom of the reducer housing (204) and the top of the steering gear housing (207), and on the inner bottom surface of the steering gear housing (207); Step 2: Install the rotation angle sensor assembly (1), install the rotation angle sensor assembly (1) inside the cavity formed by the upper end cover (201), the reducer housing (204) and the steering gear housing (207), so that the worm wheel (212) on the gear shaft (10) is meshed with the worm (213) in the reducer housing (204), and the gear shaft (10) is meshed with the rack shaft (208) in the steering gear housing (207); Step 3: After the assembly of step 1 and step 2 is completed, the housing assembly (2) is fastened and installed; The housing assembly (2) further comprises a deep groove ball bearing (200), an intermediate bearing (205) and a needle roller bearing (209); the pre-installed bearings in step 1 specifically include: The deep groove ball bearing (200) is installed into the inner top surface of the upper end cover (201), the intermediate bearing (205) is installed into the installation groove of the intermediate bearing (205) between the bottom of the reducer housing (204) and the top of the steering gear housing (207), and the needle roller bearing (209) is installed into the inner bottom surface of the steering gear housing (207), thereby completing the pre-assembly operation; The rotation angle sensor assembly (1) comprises a shaft elastic retaining ring (11); the gear shaft (10) comprises a vertical groove (100); the rotation angle sensor (12) comprises a rotation angle sensor limit block (120), a rotation angle sensor harness interface (121), a rotation angle sensor harness (122), a first tooth-shaped boss (123), a second tooth-shaped boss (124) and a gear assembly; The shaft elastic retaining ring (11) is mounted on the gear shaft (10) and is fitted with the top of the rotation angle sensor (12); the large gear of the gear assembly is rotatably connected to the body of the rotation angle sensor (12) around its axis, and the first tooth-shaped boss (123) is provided on the inner ring surface of the large gear of the gear assembly; the vertical groove (100) is provided with two and is symmetrically arranged on the gear shaft (10) rod; the first tooth-shaped boss (123) is matched and connected with the vertical groove (100); the second tooth-shaped boss (124) is provided on the outer side of the body of the rotation angle sensor (12), and the second tooth-shaped boss (124) is fixedly installed with the rotation angle sensor limit block (120), and the rotation angle sensor limit block (120) is fixedly installed in the groove on the inner side of the reducer housing (204); The rotation angle sensor harness interface (121) is arranged on the body of the rotation angle sensor (12); one end of the rotation angle sensor harness (122) is connected to an external controller, and the other end passes through a through hole on the reducer housing (204) to be connected to the rotation angle sensor harness interface (121); a sealing ring is provided on the rotation angle sensor harness (122), and the sealing ring is inserted into the through hole on the reducer housing (204); The step 2 of installing the rotation angle sensor assembly (1) specifically includes: Step 2.1: Install the worm wheel (212) to the worm wheel (212) installation position on the gear shaft (10), then align the gear assembly with the top of the gear shaft (10), and insert the gear assembly from the top of the gear shaft (10), so that the first tooth-shaped boss (123) on the rotation angle sensor (12) is matched with the vertical groove (100) on the gear shaft (10), so that the gear assembly rotates together with the gear shaft (10); Step 2.2: Use the shaft elastic retaining ring (11) to clamp the groove pre-machined on the gear shaft (10) to achieve axial positioning of the angle sensor (12) on the gear shaft (10); then align the gear shaft (10) with the pre-installed intermediate bearing (205) and install it into the reducer housing (204). When installing, the second tooth-shaped boss (124) needs to be aligned and installed in the groove of the angle sensor limit block (120) pre-machined on the inner side of the reducer housing (204); finally, install the angle sensor limit block (120) and fix the angle sensor limit block (120) and the reducer housing (204) together; Step 2.3: Connect one end of the angle sensor harness (122) to an external controller, and insert the other end into the through hole on the reducer housing (204) to enter the interior of the reducer housing (204), clamp the sealing ring on the angle sensor harness (122) into the through hole, and plug the angle sensor harness (122) into the angle sensor harness interface (121), thereby completing the assembly of the angle sensor assembly (1).

2. According to the method for installing a rotation angle sensor as claimed in claim 1, the housing assembly (2) further comprises a housing connecting bolt (202), a first O-ring (203), a second O-ring (206), a locking nut (210), a vent valve (211) and a first O-ring installation groove (214); It is characterized in that The fastening and installation of the housing assembly (2) in step 3 specifically includes: Step 3.1: First, the locking nut (210) is placed on the gear shaft (10), and the locking nut (210) is locked through the hexagon socket on the upper end of the gear shaft (10). At this time, the gear shaft (10) with the rotation angle sensor (12) is completely fixed in the reducer housing (204); Step 3.2: Then, the first O-ring (203) is placed in the first O-ring installation groove (214) on the top surface of the reducer housing (204), and the upper end cover (201) pre-installed with the deep groove ball bearing (200) is pressed against the top surface of the reducer housing (204) so ​​that the top of the gear shaft (10) penetrates the deep groove ball bearing (200), and the rack shaft (208) is inserted into the steering gear housing (207). The second O-ring (206) is placed in the second O-ring installation groove on the top surface of the steering gear housing (207), and the steering gear housing (207) pre-installed with the needle roller bearing (209) is pressed against the bottom surface of the reducer housing (204) so ​​that the bottom of the gear shaft (10) penetrates the needle roller bearing (209), and the gear shaft (10) is meshed with the rack shaft (208) in the steering gear housing (207); Step 3.3: Finally, the housing connecting bolts (202) are passed through the mounting holes of the upper end cover (201) and the mounting holes of the reducer housing (204) in sequence, and then fixed to the mounting holes of the steering gear housing (207). The torque is tightened and the vent valve (211) is installed on the mounting opening of the vent valve (211) provided on one side of the steering gear housing (207), thereby completing the fastening installation of the housing assembly (2).

3. A method for installing a rotation angle sensor according to claim 2, characterized in that: When the rotation angle sensor (12) is disassembled for maintenance, the housing connecting bolts (202) are loosened, the upper end cover (201) is removed from the reducer housing (204), the shaft elastic retaining ring (11) is removed from the gear shaft (10), and the rotation angle sensor (12) is removed from the gear shaft (10).

4. A method for installing a rotation angle sensor according to claim 2, characterized in that: The gear shaft (10) is provided with five steps, and the steps at the upper and lower ends and the middle of the gear shaft (10) are provided with bearing positions; The upper step of the gear shaft (10) is mounted in cooperation with the deep groove ball bearing (200), the lower step of the gear shaft (10) is mounted in cooperation with the needle roller bearing (209), and the middle step of the gear shaft (10) is mounted in cooperation with the intermediate bearing (205); The deep groove ball bearing (200), the intermediate bearing (205) and the needle roller bearing (209) are coaxial; The rotation angle sensor (12) is mounted on a step between the intermediate bearing (205) and the deep groove ball bearing (200); The worm wheel (212) is located on a step between the rotation angle sensor (12) and the intermediate bearing (205); A gear is provided in the area between the intermediate bearing (205) and the needle bearing (209) mounted on the gear shaft (10), and the gear is meshed with the rack shaft (208).

5. A method for installing a rotation angle sensor according to claim 2, characterized in that: The first O-type sealing ring (203) is installed on the top surface of the reducer housing (204), and the second O-type sealing ring (206) is installed on the top surface of the steering gear housing (207).

6. A method for installing a rotation angle sensor according to claim 2, characterized in that: The locking nut (210) is mounted on the gear shaft (10), and the locking nut (210) is locked via the hexagon socket on the upper end of the gear shaft (10); The housing connecting bolts (202) are sequentially passed through the mounting holes of the upper end cover (201), the reducer housing (204) and the steering gear housing (207) for fixing; A channel penetrating the internal cavity is provided on one side of the steering gear housing (207), and the vent valve (211) is installed outside the channel opening.

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