Steering gear rack guiding device

Abstract

The utility model discloses a steering gear rack guiding device, and belongs to the technical field of steering gear, the steering gear rack guiding device comprises a steering gear shell and a spherical nut seat arranged in the steering gear shell, a worm is sleeved in the spherical nut seat, one end of the worm is fixedly provided with a steering shaft, the side edge of the steering gear shell is detachably provided with an assembly seat, and the assembly seat is fixedly provided with an assembly hole. The steering gear shell is provided with a swing arm shaft, and one end of the swing arm shaft is provided with a sector gear connected with the lower end of the spherical nut seat in an engaged mode. Lubricating oil is stored in the oil storage box, the oil outlet pressure is controlled through the micro pressure valve, the lubricating oil flows to the flow sensor through the connecting pipe, flow data are monitored in real time and fed back to the vehicle ECU, the ECU dynamically adjusts the oil injection amount according to parameters such as the steering frequency, a driver or maintenance personnel is prompted, and therefore oil outlet is controlled through the micro pressure valve. And finally, the lubricating oil drips onto the moving path of the steel ball through the oil dripping nozzle, so that the service lives of the worm and the spherical nut seat are prolonged.

Description

Technical Field

[0001] This application relates to the field of steering gear technology, specifically a steering gear rack guide device. Background Technology

[0002] In existing steering gear designs, recirculating ball steering gears are widely used in the steering systems of automobiles and other vehicles due to their unique structure and excellent performance. One of the key components of recirculating ball steering gears is the rack guide device, which cooperates with the worm gear through a ball nut seat to guide and limit the worm gear. This design enables the steering gear to operate smoothly and ensures the vehicle's steering and handling performance.

[0003] The rolling contact between the ball bearing seat and the worm gear in a recirculating ball steering gear provides low-friction operating conditions. However, over time, the decline in lubrication performance leads to an increase in friction. Typically, a circulating lubrication system is used for this device to reduce friction by periodically adding oil. However, current recirculating ball steering gears have a significant technical problem: the interval between lubrication injections is relatively long. This may result in the lubricant not being replenished in time during prolonged use, causing the contact surface between the steel ball and the ball bearing seat to lose sufficient lubrication protection. Due to insufficient lubrication, the friction between the steel ball and the ball bearing seat increases significantly, leading to wear and corrosion on the steel ball surface, ultimately affecting the overall steering gear's operating accuracy and durability.

[0004] Therefore, this application provides a steering rack guide device to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a steering rack guide device, which aims to solve the problem mentioned in the background art that the interval between single oil injection and lubrication of the recirculating ball steering gear is too long, which may lead to the failure of lubricating oil to be replenished in time during long-term use, thereby causing the contact surface between the steel ball and the ball nut seat to lose sufficient lubrication protection.

[0006] To achieve the above objectives, this application provides the following technical solution: a steering gear rack guide device, comprising a steering gear housing and a spherical nut seat disposed inside the steering gear housing, a worm gear being fitted inside the spherical nut seat, a steering shaft being fixedly mounted at one end of the worm gear, a mounting base being detachably mounted on the side of the steering gear housing, the mounting base being sleeved with the steering shaft, a swing arm shaft being disposed on the steering gear housing, a sector tooth being disposed at one end of the swing arm shaft and meshing with the lower end of the spherical nut seat, and a cover being detachably mounted on the upper end of the steering gear housing;

[0007] An oil injection mechanism is provided at the upper end of the ball nut seat;

[0008] The oil injection mechanism includes a top cover mounted on a ball nut seat. An oil storage box is detachably mounted on the upper end of the top cover. A through hole is provided on the top cover, and an oil drip nozzle is inserted into the through hole. A miniature pressure valve connected to the oil drip nozzle is installed at the oil outlet of the oil storage box.

[0009] Preferably, a mounting base is fixedly installed on the upper end of the drip nozzle, and a flow sensor is provided on the upper end of the mounting base. The input port of the flow sensor is connected to the output port of the micro pressure valve through a connecting pipe. The flow sensor is linked with the ECU and can automatically adjust the output of lubricating oil according to the steering frequency, reducing the oil injection frequency when driving at high speed and increasing the oil injection when steering at low speed.

[0010] Preferably, the inner side of the fixed base is provided with a threaded surface, and the lower end of the flow sensor is provided with a threaded joint that is threadedly connected to the fixed base.

[0011] Preferably, a filter screen is provided on the inner side of the fixing seat, and a sealing ring is provided at the connection between the fixing seat and the top cover. The filter screen and the self-lubricating material provide double protection, which extends the service life of the worm gear and the ball nut seat.

[0012] Preferably, the ball nut seat has a rectangular groove, and a threaded hole is formed opposite to the rectangular groove. The top cover and the ball nut seat are fixedly connected by a cross screw.

[0013] This guiding device stores lubricating oil in an oil reservoir and controls the oil pressure through a miniature pressure valve. The lubricating oil flows through a connecting pipe to a flow sensor, which monitors the flow data in real time and feeds it back to the vehicle's ECU. The ECU dynamically adjusts the oil supply based on parameters such as steering frequency. When the flow sensor detects that the flow rate is below a threshold, it triggers a low oil alarm, alerting the driver or maintenance personnel. The miniature pressure valve then controls the oil supply, and finally, the lubricating oil is dripped onto the path of the moving steel ball through an oil drip nozzle, thereby extending the life of the worm gear and ball nut seat. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a steering rack guide device.

[0015] Figure 2 This is a schematic diagram of the structure of a ball nut seat;

[0016] Figure 3 This is a schematic diagram of the top cover structure;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the top cover;

[0018] Figure 5 This is a schematic diagram of the oil drip nozzle.

[0019] In the picture:

[0020] 1. Steering gear housing; 11. Cover; 2. Mounting base; 3. Swing arm shaft; 4. Ball nut seat; 5. Worm gear; 51. Steering shaft; 6. Oil injection mechanism; 61. Top cover; 62. Oil reservoir; 63. Miniature pressure valve; 64. Connecting pipe; 65. Flow sensor; 651. Threaded joint; 66. Mounting base; 67. Oil drip nozzle; 68. Filter screen. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This embodiment provides a steering rack guide device, such as Figure 1-5 As shown, the guiding device includes a steering gear housing 1 and a ball nut seat 4 disposed inside the steering gear housing 1. A worm gear 5 is fitted inside the ball nut seat 4. A steering shaft 51 is fixedly installed at one end of the worm gear 5. An assembly seat 2 is detachably installed on the side of the steering gear housing 1. The assembly seat 2 is sleeved with the steering shaft 51. A swing arm shaft 3 is provided on the steering gear housing 1. One end of the swing arm shaft 3 is provided with sector teeth that mesh with the lower end of the ball nut seat 4. A cover 11 is detachably installed on the upper end of the steering gear housing 1.

[0023] An oil injection mechanism 6 is provided at the upper end of the ball nut seat 4;

[0024] The oil filling mechanism 6 includes a top cover 61 mounted on a ball nut seat 4. An oil storage box 62 is detachably mounted on the upper end of the top cover 61. A through hole is provided on the top cover 61, and an oil drip nozzle 67 is inserted into the through hole. A miniature pressure valve 63 connected to the oil drip nozzle 67 is installed at the oil outlet of the oil storage box 62.

[0025] Specifically, a rack is provided at the lower end of the ball nut seat 4. The steering shaft 51 drives the worm gear 5 to rotate. The sector gear meshes with the rack of the ball nut seat 4, converting the rotational motion into the linear motion of the ball nut seat 4. In the oil injection mechanism 6, the lubricating oil in the oil storage box 62 controls the flow rate through the micro pressure valve 63 and drips into the steel ball circulation path of the ball nut seat 4 through the oil drip nozzle 67. The steel balls that pass through contact with the lubricating oil, thereby achieving lubrication. The micro pressure valve 63 controls the output pressure of the lubricating oil to avoid leakage due to excessive oil pressure or insufficient lubrication due to excessively low oil pressure. The capacity of the oil storage box 62 is 200mL.

[0026] The upper end of the drip nozzle 67 is fixedly mounted with a mounting base 66, and the upper end of the mounting base 66 is provided with a flow sensor 65. The input port of the flow sensor 65 is connected to the output port of the miniature pressure valve 63 through a connecting pipe 64.

[0027] More specifically, the flow sensor 65 monitors the lubricating oil flow in real time through the connecting pipe 64 and feeds the data back to the vehicle ECU. When the flow is abnormal, an alarm is triggered to indicate that the oil is low. The mounting bracket 66 provides support for the sensor installation and ensures the connection is sealed.

[0028] The inner side of the fixed base 66 is provided with a threaded surface, and the lower end of the flow sensor 65 is provided with a threaded connector 651 that is threadedly connected to the fixed base 66.

[0029] Furthermore, the flow sensor 65 is threadedly connected to the mounting base 66 via a threaded connector 651, facilitating disassembly, calibration, or replacement.

[0030] A filter screen 68 is provided on the inner side of the fixed base 66, and a sealing ring is provided at the connection between the fixed base 66 and the top cover 61.

[0031] It should be noted that filter 68 filters impurities in the lubricating oil to prevent particles from entering the meshing surface and aggravating wear. The sealing ring is made of nitrile rubber to ensure that there is no leakage at the connection between the fixed seat 66 and the top cover 61. Filter 68 intercepts metal shavings and other impurities.

[0032] The ball nut seat 4 has a rectangular groove, and a threaded hole is provided opposite to the rectangular groove. The top cover 61 is fixedly connected to the ball nut seat 4 by a cross screw.

[0033] It is worth mentioning that the top cover 61 is fixed in the rectangular groove of the ball nut seat 4 by a cross screw, which ensures that the oil injection mechanism 6 is firmly installed. The installation stability of the oil injection mechanism 6 is improved, and oil leakage or component detachment caused by vibration is avoided.

[0034] During use, the oil reservoir 62 stores lubricating oil, and the oil outlet pressure is controlled by the micro pressure valve 63. The lubricating oil flows to the flow sensor 65 through the connecting pipe 64, which monitors the flow data in real time and feeds it back to the vehicle ECU. The ECU dynamically adjusts the oil injection amount according to parameters such as steering frequency. When the flow sensor 65 detects that the flow is lower than the threshold, it triggers an oil shortage alarm to alert the driver or maintenance personnel. After the lubricating oil passes through the filter screen 68 to filter impurities, it is injected into the meshing surface of the ball nut seat 4 and the worm gear 5 through the oil drip nozzle 67 to form an oil film and reduce friction.

[0035] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A steering gear rack guide device, comprising a steering gear housing (1) and a ball nut seat (4) disposed inside the steering gear housing (1), wherein a worm gear (5) is fitted inside the ball nut seat (4), and a steering shaft (51) is fixedly installed at one end of the worm gear (5), a mounting seat (2) is detachably installed on the side of the steering gear housing (1), the mounting seat (2) is sleeved with the steering shaft (51), a swing arm shaft (3) is provided on the steering gear housing (1), one end of the swing arm shaft (3) is provided with a sector tooth that meshes with the lower end of the ball nut seat (4), and a cover (11) is detachably installed on the upper end of the steering gear housing (1). Its features are: The upper end of the ball nut seat (4) is provided with an oil injection mechanism (6). The oil injection mechanism (6) includes a top cover (61) set on a ball nut seat (4). An oil storage box (62) is detachably installed on the upper end of the top cover (61). A through hole is opened on the top cover (61), and an oil drip nozzle (67) is inserted into the through hole. A miniature pressure valve (63) connected to the oil drip nozzle (67) is installed at the oil outlet of the oil storage box (62).

2. The steering rack guide device according to claim 1, characterized in that: The upper end of the drip nozzle (67) is fixedly mounted with a mounting base (66), and the upper end of the mounting base (66) is provided with a flow sensor (65). The input port of the flow sensor (65) is connected to the output port of the miniature pressure valve (63) through a connecting pipe (64).

3. The steering rack guide device according to claim 2, characterized in that: The inner side of the fixed base (66) is provided with a threaded surface, and the lower end of the flow sensor (65) is provided with a threaded connector (651) that is threadedly connected to the fixed base (66).

4. The steering rack guide device according to claim 3, characterized in that: A filter screen (68) is provided on the inner side of the fixed base (66), and a sealing ring is provided at the connection between the fixed base (66) and the top cover (61).

5. The steering rack guide device according to claim 1, characterized in that: The ball nut seat (4) has a rectangular groove, and a threaded hole is provided opposite to the rectangular groove. The top cover (61) and the ball nut seat (4) are fixedly connected by a cross screw.

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