A noise reduction type automobile steering gear

Abstract

The utility model relates to the technical field of automobile steering gear, disclose a kind of noise reduction type automobile steering gear, including rack gear, two pull rods and two ball head pins, the outer wall of rack gear is engaged with steering lever by gear, the both sides of rack gear inner wall are fixedly connected with torque bar, the both sides of torque bar outer wall are respectively connected by hinged member hinged connection with the adjacent two sides of pull rod, the side of pull rod far from rack gear middle part is all connected with ball head pin by hinged member hinged connection, the outer wall of ball head pin upper end is all provided with slotted nut. In the utility model, the anaerobic adhesive used in the connecting place of pull rod and rack and torque bar tightening process ensure the firm and reliable connection, the molybdenum disulfide grease filled in ball head pin ensures its rotation smooth and reduces noise, rubber protective cover and the protective sleeve everywhere effectively isolate vibration, impact and external environment, further reduce noise.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, and in particular to a noise-reducing automotive steering system. Background Technology

[0002] The steering system is a key component of the car chassis system. Its core function is to precisely transmit the steering force applied by the driver through the steering wheel to the wheels through a series of mechanical, hydraulic, or even electric conversions and amplifications, thereby changing or maintaining the car's direction of travel. Simply put, it is like the "brain of the steering wheel" of the car, allowing the driver to easily and accurately control the vehicle's left and right steering. Depending on the technology, it can be a traditional hydraulic power steering system or a more modern electric power steering system (EPS). Although the forms are different, the ultimate goal is to ensure that the vehicle's steering response is rapid, the operation is easy, and the stability and reliability are good.

[0003] Traditional steering gears often lack anaerobic adhesive and torque bar tightening processes at the connection between the tie rod and rack, making the threaded connection prone to loosening under long-term vibration and alternating loads, affecting steering accuracy and safety. Furthermore, the ball joint pins may not use high-quality lubricants such as molybdenum disulfide grease, resulting in increased friction and poor lubrication. This not only makes the steering feel stiff but also easily produces "squeaking" noise and accelerates component wear. In addition, traditional designs may lack rubber protective covers and sleeves, allowing road vibrations and impacts to be directly transmitted to the steering components, increasing the structural burden and making the driving experience less smooth and quiet.

[0004] Therefore, those skilled in the art have provided a noise-reducing automotive steering system to address the problems mentioned in the background section. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a noise-reducing automotive steering system. The anaerobic adhesive and torque bar tightening process used at the connection between the tie rod and the rack ensure a firm and reliable connection. The molybdenum disulfide grease filled in the ball joint pin ensures smooth rotation and reduces noise. The rubber protective cover and protective sleeves at various locations effectively isolate vibration, impact and external environment, further reducing noise.

[0006] To achieve the above objectives, this utility model provides a noise-reducing automotive steering gear, including a rack and pinion frame, two tie rods, and two ball joint pins. The outer wall of the rack and pinion frame is fitted with a steering rod via gears. Both sides of the inner wall of the rack and pinion frame are fixedly connected to torque bars. The two sides of the outer wall of the torque bars are respectively hinged to the adjacent sides of the tie rods via hinges. The side of each tie rod away from the middle of the rack and pinion frame is hinged to a ball joint pin via a hinge. The outer wall of the upper end of each ball joint pin is provided with a slotted nut.

[0007] Through the above technical solution, the linear motion of the rack is converted into rotational motion through a meshing pinion, thereby achieving precise steering angle control. The main function of the torque bar is to provide steering return torque and suppress road impacts. It absorbs some of the impact from the road surface through its own elastic deformation and helps the wheels automatically return to center after steering, improving straight-line driving stability and steering feel. Fixing it to the inner wall of the rack allows for more direct transmission of the rack's motion and force to the torque bar, fulfilling its function. The torque bar is hinged to the tie rod via a hinge joint. When the torque bar is affected by road impacts or steering operations... During deformation, the force or motion can be transmitted to a more distant wheel knuckle via the tie rod, or it can be used as part of the overall steering system structure to enhance its overall rigidity and prevent local deformation. In addition, the articulated connection allows for changes in the relative angle between the tie rod and the ball joint pin, which enables the steering system to maintain effective connection and force transmission under complex road conditions, while reducing interference and wear between components. The ball joint pin provides a spherical contact articulation point, allowing for a large range of angle changes, making it ideal for connection to the wheel knuckle to accommodate wheel vertical movement and steering angle. The slotted nut is relatively easy to remove and install.

[0008] Furthermore, a spline is fixedly connected to the upper end of the steering rod;

[0009] Through the above technical solutions, the main function of the spline is to efficiently and reliably transmit torque and axial force. In the steering system, the torque output by the steering gear needs to be transmitted to the wheel through the steering rod. The spline can ensure that this transmission process is smooth and without slippage.

[0010] Furthermore, rubber protective covers are provided on the outer walls of adjacent sides of the tie rod and torque bar on the same side;

[0011] The above technical solution utilizes the rubber protective cover's excellent elasticity and cushioning properties to absorb some of the impact and vibration, reducing direct contact between metal parts, thereby effectively reducing the resulting noise and vibration and improving driving comfort.

[0012] Furthermore, the ball thread of the steering rod and the spline of the input shaft are both equipped with protective sleeves;

[0013] Through the above technical solutions, once contaminants such as dust, iron filings, and oil enter the mating gap of ball threads or splines, they will not only affect the smoothness of the initial assembly, but may also accelerate wear during subsequent use, or even cause jamming or poor fit. The protective sleeve can effectively isolate the external environment, keep these surfaces clean, and ensure smooth operation during assembly and subsequent use.

[0014] Furthermore, the connection between the tie rod and the rack of the frame is coated with threaded anaerobic adhesive and tightened by a torque bar;

[0015] Through the above technical solutions, anaerobic adhesive is an adhesive that can cure rapidly in an oxygen-free environment. After being applied to the threads, it will quickly cure when the nut is tightened and air is cut off, forming a tough adhesive layer between the threads, firmly bonding the bolt and nut together. This can prevent the threads from loosening due to vibration, impact, or long-term use. Furthermore, the application of anaerobic adhesive can effectively maintain the tightness of the connection, avoiding the impact on steering accuracy or even safety hazards caused by loosening. A torque bar is a simple but effective tool used to control the applied torque when tightening bolts, preventing damage to the threads or connectors due to uneven or excessive human force, and ensuring that the required tightness is achieved. The tightening torque is 69-98 N.m.

[0016] Furthermore, the lower end of the ball head pin is filled with molybdenum disulfide grease, and both the ball head pin and the slotted nut are plated with trivalent environmentally friendly zinc.

[0017] Through the above technical solution, molybdenum disulfide is an excellent solid lubricant that provides good lubrication even under harsh conditions such as high temperature, high pressure, or humidity. Filling the ball joint with this grease ensures very smooth relative movement between the ball and the pin seat, reducing direct metal-to-metal friction. Good lubrication can eliminate or reduce "squeaking" or other abnormal noises caused by dry friction, jamming, or uneven wear, making steering operation smoother and quieter. In addition, the zinc coating can form a dense protective film on the metal surface, effectively isolating corrosive media such as air, moisture, and road salt, preventing the ball joint and nut from rusting. Preventing corrosion means that the components will not fail, jam, or degrade in performance due to rust. This ensures the long-term effectiveness of the flexible rotation of the ball joint and the reliable fastening function of the slotted nut, improving the durability and operational reliability of the entire steering system.

[0018] This utility model has the following beneficial effects:

[0019] This utility model proposes a noise-reducing automotive steering gear. The anaerobic adhesive and torque bar tightening process used at the connection between the tie rod and the rack ensure a firm and reliable connection. The molybdenum disulfide grease filled in the ball joint pin ensures smooth rotation and reduces noise. The rubber protective cover and protective sleeves at various locations effectively isolate vibration, impact and external environment, further reducing noise. Attached Figure Description

[0020] Figure 1 This is a front cross-sectional view of a noise-reducing automotive steering system proposed in this utility model;

[0021] Figure 2 This is a partial structural isometric view of a noise-reducing automotive steering system proposed in this utility model;

[0022] Figure 3This is a partial structural cross-sectional view of a noise-reducing automotive steering system proposed in this utility model;

[0023] Figure 4 This is a partial structural isometric view of a noise-reducing automotive steering system proposed in this utility model.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Frame rack; 101. Torque bar; 2. Steering rod; 201. Spline; 3. Tie rod; 4. Ball head pin; 401. Slotted nut; 5. Rubber protective cover. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Reference Figure 1 and Figure 2This utility model provides a specific embodiment: a noise-reducing automotive steering gear, including a rack and pinion 1, two tie rods 3, and two ball joint pins 4. A steering rod 2 is meshed with the outer wall of the rack and pinion 1 via gears. Torque bars 101 are fixedly connected to both sides of the inner wall of the rack and pinion 1. The two sides of the outer wall of the torque bars 101 are hinged to the adjacent sides of the tie rods 3 via hinges. Ball joint pins 4 are hinged to the side of the tie rods 3 away from the middle of the rack and pinion 1 via hinges. Slotted nuts 401 are provided on the outer wall of the upper end of each ball joint pin 4. The linear motion of the rack and pinion 1 is converted into rotational motion through the meshing pins, thereby achieving precise steering angle control. The main function of the torque bars 101 is to provide steering return torque and suppress road impact. It absorbs some of the impact from the road surface through its own elastic deformation and helps the wheels automatically return to center after steering, improving straight-line driving stability and steering. The tactile feedback, by fixing it to the inner wall of the rack, allows for a more direct transmission of the rack's movement and force to the torque bar 101, thus fulfilling its function. The torque bar 101 is hinged to the tie rod 3 via a hinge joint. When the torque bar 101 deforms due to road impact or steering operation, this force or movement can be transmitted to a more distant wheel steering knuckle via the tie rod 3. Alternatively, it can serve as part of the overall steering system structure, enhancing its overall rigidity and preventing local deformation. Furthermore, the hinged connection allows for relative angle variations between the tie rod 3 and the ball joint pin 4, enabling the steering system to maintain effective connection and force transmission under complex road conditions while reducing interference and wear between components. The ball joint pin 4 provides a spherical contact hinge point, allowing for a large range of angle variations, making it ideal for connection to the wheel steering knuckle to accommodate wheel vertical movement and steering angle. The slotted nut 401 is relatively easy to remove and install.

[0028] Reference Figure 1 and Figure 3The upper end of the steering rod 2 is fixedly connected to a spline 201. The main function of the spline 201 is to efficiently and reliably transmit torque and axial force. In the steering system, the torque output by the steering gear needs to be transmitted to the wheels through the steering rod 2. The spline 201 ensures that this transmission process is smooth and without slippage. Rubber protective covers 5 are provided on the outer walls of the tie rod 3 and the torque bar 101 on the same side. The rubber protective covers 5 have good elasticity and buffering performance, which can absorb this impact and vibration, reduce the direct contact between metal parts, and thus effectively reduce the noise and vibration generated, improving driving comfort. The ball thread of the steering rod 2 and the spline 201 of the input shaft are both equipped with protective sleeves. Once contaminants such as dust, iron filings, and oil enter the mating clearance of the ball thread or spline 201, they will not only affect the smoothness of the initial assembly, but may also accelerate wear in subsequent use, or even cause jamming or poor fit. The protective sleeves can prevent these contaminants from entering the mating clearance of the ball thread or spline 201. Effectively isolating the external environment and keeping these surfaces clean ensures smooth operation during assembly and subsequent use. Anaerobic adhesive is applied to the connection between the tie rod 3 and the rack 1 of the frame, and then tightened using the torque bar 101. Anaerobic adhesive is a fast-curing adhesive that cures quickly in an oxygen-free environment. After being applied to the threads, it rapidly cures when the nut is tightened and air is isolated, forming a tough adhesive layer between the threads that firmly bonds the bolt and nut together. This prevents loosening of the threads due to vibration, impact, or long-term use. Furthermore, the application of anaerobic adhesive effectively maintains the tightness of the connection, preventing loosening from affecting steering accuracy or even causing safety hazards. The torque bar 101 is a simple yet effective tool used to control the applied torque when tightening bolts, preventing damage to the threads or connectors due to uneven or excessive force, and ensuring the required tightness is achieved. The tightening torque is 69-98 N·m.

[0029] Reference Figure 1 , Figure 3 and Figure 4 The lower end of the ball head pin 4 is filled with molybdenum disulfide grease. Both the ball head pin 4 and the slotted nut 401 are plated with trivalent environmentally friendly zinc. Molybdenum disulfide is an excellent solid lubricant that can provide good lubrication even under harsh conditions such as high temperature, high pressure or humidity. Filling the ball head pin 4 with this grease can ensure that the relative movement between the ball head and the pin seat is very smooth, reducing direct friction between metals. Good lubrication can eliminate or reduce "squeaking" or other abnormal noises caused by dry friction, jamming or uneven wear, making steering operation smoother and quieter. In addition, the zinc coating can form a dense protective film on the metal surface, effectively isolating corrosive media such as air, moisture and road salt, preventing the ball head pin 4 and nut from rusting. Preventing corrosion means that the parts will not fail, jam or degrade in performance due to rust. This ensures that the flexible rotation of the ball head pin 4 and the reliable fastening function of the slotted nut 401 are effective for a long time, improving the durability and operational reliability of the entire steering system.

[0030] Working principle: When the driver turns the steering wheel, the input power first drives the pinion on the steering lever 2 to mesh with the rack 1 on the frame, causing the rack to reciprocate in a straight line. The torque bar 101 fixed on the inner wall of the rack moves synchronously and absorbs part of the road impact. At the same time, it provides the return torque after the steering is completed. The movement of the rack is transmitted through the tie rods 3 hinged to its two sides. The ball joint pin 4 at the other end of the tie rod 3 is connected to the steering knuckle of the wheel, thereby driving the wheel to turn. In this process, the anaerobic adhesive used at the connection between the tie rod 3 and the rack and the tightening process of the torque bar 101 ensure a firm and reliable connection. The molybdenum disulfide grease filled in the ball joint pin 4 ensures its smooth rotation and reduces noise. The rubber protective cover 5 and the protective sleeves in various places effectively isolate vibration, impact and external environment, further reducing noise and protecting the components. The trivalent environmentally friendly zinc plating provides anti-corrosion protection. All these designs work together to enable the steering gear to accurately, smoothly, quietly and reliably translate the driver's steering intention into the actual movement of the wheels.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A noise-reducing automobile steering gear comprising a rack (1), two tie-rods (3) and two ball head pins (4), characterized in that: The outer wall of the rack (1) of the frame is connected to a steering rod (2) by gear meshing. Both sides of the inner wall of the rack (1) of the frame are fixedly connected to torque rods (101). The two sides of the outer wall of the torque rods (101) are respectively connected to the adjacent sides of the tie rods (3) by hinges. The side of the tie rods (3) away from the middle of the rack (1) of the frame is connected to a ball head pin (4) by hinges. The upper end of the ball head pin (4) is provided with a slotted nut (401).

2. The noise reducing automotive steering gear of claim 1 wherein: The upper end of the steering rod (2) is fixedly connected to a spline (201).

3. The noise reducing automotive steering gear of claim 1 wherein: Rubber protective covers (5) are provided on the outer walls of adjacent sides of the tie rod (3) and torque bar (101) on the same side.

4. The noise reducing automotive steering gear of claim 1 wherein: The ball thread of the steering rod (2) and the spline of the input shaft (201) are both equipped with protective sleeves.

5. The noise reducing automotive steering gear of claim 1 wherein: The connection between the tie rod (3) and the rack (1) of the frame is coated with threaded anaerobic adhesive and tightened by a torque bar (101).

6. The noise reducing automotive steering gear of claim 1 wherein: The lower end of the ball head pin (4) is filled with molybdenum disulfide grease, and the ball head pin (4) and the slotted nut (401) are plated with trivalent environmentally friendly zinc.

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