Automobile bearing extractor

Abstract

The utility model provides a kind of automobile bearing extractor, including main body cylinder and screw rod push rod;Main body cylinder is configured as being detachably clamped in the cylinder liner inner cavity outside bearing, internally fixedly arranged nut, nut and main body cylinder are same direction;Screw rod push rod is by screw rod, push plate and clamping head and constitutes integrated structure;The screw rod and the nut form threaded engagement relationship;The push plate is fixedly arranged in the axial first end of screw rod, for abutting bearing end face;The clamping head is arranged in the axial second end of screw rod, is configured as accepting external rotary driving force The utility model has the beneficial effects that: by screw rod push rod and main body cylinder cooperation, ensure that push plate is along absolute straight line motion, thoroughly eliminate partial load risk, push plate covers bearing inner ring end face, and the pressure evenly distributed to entire stress area is applied, fundamentally avoid the indentation damage caused by local overload, let oil seal effectively avoid mechanical scraping in entire dismounting process.

Description

Technical Field

[0001] This utility model relates to the field of automotive repair tools, specifically to an automotive bearing remover. Background Technology

[0002] As a core load-bearing component of a vehicle's transmission system, automotive bearings require a structural design that balances high load transmission accuracy with long-term service stability. Based on their load-bearing principle, they can be broadly classified into rolling bearings and sliding bearings. Rolling bearings, due to their low coefficient of friction and high fatigue resistance, are widely used in critical components such as wheels and gearboxes. These bearings typically employ an interference fit, using a press-fit process to ensure a tight fit between the bearing inner ring and the journal, guaranteeing no relative displacement during high-speed operation. However, while interference fits enhance operational stability, they also introduce potential hazards for maintenance and disassembly—especially when the bearing is installed within deep, enclosed cavities such as cylinder liners or wheel hubs, where the operating space is often limited to narrow gaps, making it difficult for traditional disassembly tools to effectively intervene.

[0003] The difficulty in removing bearings from cylinder liners stems from two major bottlenecks: spatial adaptability and mechanical transmission efficiency. Firstly, the thickness of the claws in conventional pullers far exceeds the gap between the cylinder liner wall and the bearing end face; forced insertion can scratch the mating surfaces or even cause the claws to deform and break. Secondly, the initial pressure exerted by the interference fit requires 5–10 kN, but the deep cavity structure keeps the force application point far from the bearing axis. An excessively large length-to-diameter ratio can easily cause the puller rod to deflect, decomposing the axial force into a radial component. This not only drastically reduces disassembly efficiency by more than 50% but may also cause the cylinder liner inner wall to be squeezed, resulting in out-of-roundness errors. Furthermore, bearings that have been in service for a long time may adhere to the cylinder liner due to grease carbonization or metal corrosion, creating additional resistance.

[0004] Tool failure and loss of control during disassembly directly lead to damage to parts and personal injury: At the part level, forcibly striking the outer ring of a bearing can cause the rolling elements to shatter or the cage to deform plastically, rendering a repairable bearing completely unusable; if the pulling force is off-target, it can even scratch the inner wall of the cylinder liner, increasing repair costs by more than 200%. The personnel safety risks are even more severe: when the operator applies force to rotate the wrench, if the screw thread breaks or the claw hook breaks, the operator's body inertia may cause them to strike the sharp metal edge, resulting in hand crush injuries or facial lacerations; the flying metal fragments generated by hammering during disassembly may directly injure the operator's eyes. Utility Model Content

[0005] To solve the problem of inconvenient removal of the bearing inside the cylinder liner of automobiles.

[0006] This utility model provides an automotive bearing remover, characterized in that it includes a main cylinder and a lead screw push rod;

[0007] The main body is configured to be detachably snapped into the cylinder liner cavity outside the bearing, and a nut is fixedly installed inside, with the nut facing the same direction as the main body;

[0008] The lead screw push rod is an integrated structure consisting of a lead screw, a push plate, and a clamping head. The lead screw and the nut are threaded together. The push plate is fixed to the first axial end of the lead screw and is used to abut against the bearing end face. The clamping head is located at the second axial end of the lead screw and is configured to receive external rotational driving force. By rotating the clamping head, the lead screw push rod is driven to move axially along the main body cylinder, so that the push plate applies an axial ejection force to the bearing, thereby realizing the ejection operation of the bearing from the cylinder liner.

[0009] As a preferred embodiment, at least two connecting rods are symmetrically arranged on the inner wall of the main body cylinder. The inner radial end of the connecting rod is rigidly connected to the outer wall of the nut, and the outer radial end extends to the side wall of the main body cylinder. The connecting rod is used to transmit axial load and maintain the circumferential positioning of the nut.

[0010] As a preferred embodiment, the central axis of the nut coincides with the central axis of the main cylinder, forming a coaxial structure to ensure that the axial movement trajectory of the lead screw push rod is free from deviation.

[0011] As a preferred embodiment, the main body cylinder has through holes on its side wall that match the number of connecting rods, and the connecting rods are rotatably assembled into the through holes.

[0012] As a preferred embodiment, the main body cylinder has multiple snap-fit ​​bolts evenly distributed around its sidewall, and the snap-fit ​​bolts can be rotated to accommodate cylinder liners with different inner diameters.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention utilizes a lead screw and push rod in conjunction with the main cylinder to ensure the push plate moves in an absolutely linear fashion, completely eliminating the risk of off-center loading. The push plate covers the inner ring end face of the bearing, and the applied pressure is evenly distributed throughout the entire stress area, fundamentally avoiding indentation damage caused by local overload. This allows the oil seal to effectively avoid mechanical scratching during the entire disassembly process, transforming complex engineering problems into an efficient and reliable operation. The rapid anchoring of the locking bolts eliminates repeated adjustment time, and the large-stroke lead screw drive enables uninterrupted ejection operations. Feedback from actual maintenance shows that even with old bearings with severe interference fits, this device can smoothly disassemble them without damaging components, significantly reducing associated maintenance costs due to operational errors. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2This is a structural schematic diagram of the present invention from another angle.

[0018] Numbering on the map:

[0019] 1. Main cylinder; 11. Nut; 12. Connecting rod; 14. Snap bolt; 2. Lead screw push rod; 21. Lead screw; 22. Push plate; 23. Clamping head. Detailed Implementation

[0020] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0021] Example:

[0022] Please refer to the following: Figure 1 and Figure 2 This utility model embodiment consists of a main cylinder 1 and a lead screw push rod 2. The main cylinder 1 is machined from 45# seamless steel pipe with an outer diameter of Φ80mm and a wall thickness of 8mm. Its inner cavity is fixedly fitted with nuts 11 via two radially evenly distributed connecting rods 12. The radial inner end of the connecting rod 12 is rigidly connected to the outer wall of the nut 11 by argon arc welding, and the radial outer end extends to the side wall of the main cylinder 1, passing through a through hole in the side wall for rotatable assembly. The central axis of the nut 11 is strictly coincident with the central axis of the main cylinder 1, ensuring no deviation in the transmission trajectory. Two M10 snap-fit ​​bolts 14 are evenly distributed circumferentially on the outer wall of the main cylinder 1. The bolt ends are welded with hard alloy conical heads, which can be adapted to cylinder liners with an inner diameter range of Φ82-Φ92mm during rotational adjustment. Pre-tightening force enables rapid fixing of the cylinder.

[0023] The lead screw 2 is an integrated forged component: the lead screw 21 adopts a Tr30×6 trapezoidal thread with a length of 250mm to achieve precise engagement with the nut 11; the push plate 22 has a diameter of Φ75mm and a thickness of 15mm, and is welded to the first axial end of the lead screw 21, with a polyurethane buffer pad embedded on the end face for uniform contact with the bearing end face; the clamping head 23 is located at the second axial end of the lead screw 21 and is knurled for anti-slip, and can accept the rotational driving force of an electric wrench or torque wrench.

[0024] The workflow of this embodiment is as follows:

[0025] Insert the main body 1 into the cylinder liner cavity outside the bearing, and rotate the two locking bolts 14 until the cone head is pressed against the inner wall of the cylinder liner, forming a radial self-locking. At this time, a 2-3mm gap is left between the push plate 22 and the bearing end face to avoid preload damage.

[0026] Rotate the clamping head 23 using a torque wrench to drive the lead screw 21 to move along the thread engagement direction of the nut 11. The push plate 22 continuously presses against the bearing end face with an axial force of ≥5kN. When the bearing disengages from the interference fit section, the ejection force drops sharply to below 1kN, at which point the bearing can be manually pulled out.

[0027] After disassembly and assembly, reverse the clamping head 23 to return the lead screw push rod 2 to its initial position, and then loosen the locking bolt 14 to remove the tool. The entire process requires no hammering or hot operation, avoiding journal deformation caused by traditional disassembly.

[0028] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A car bearing remover, characterized in that: It includes the main cylinder (1) and the lead screw push rod (2); The main body (1) is configured to be detachably snapped into the cylinder liner cavity outside the bearing, and a nut (11) is fixedly installed inside, with the nut (11) and the main body (1) in the same direction; The lead screw push rod (2) is an integrated structure consisting of a lead screw (21), a push plate (22), and a clamping head (23). The lead screw (21) and the nut (11) form a threaded engagement relationship. The push plate (22) is fixed to the first axial end of the lead screw (21), and a polyurethane buffer pad is embedded on the end face to abut against the bearing end face. The clamping head (23) is located at the second axial end of the lead screw (21) and is configured to receive external rotational driving force. By rotating the clamping head (23), the lead screw push rod (2) is driven to move axially along the main body cylinder (1), so that the push plate (22) applies an axial ejection force to the bearing, thereby realizing the ejection operation of the bearing from the cylinder liner.

2. The automotive bearing extractor according to claim 1, characterized in that: At least two connecting rods (12) are symmetrically arranged on the inner wall of the main body (1). The inner radial end of the connecting rod (12) is rigidly connected to the outer wall of the nut (11), and the outer radial end extends to the side wall of the main body (1). The connecting rod (12) is used to transmit axial load and maintain the circumferential positioning of the nut (11).

3. The automotive bearing extractor according to claim 1, characterized in that: The central axis of the nut (11) coincides with the central axis of the main cylinder (1), forming a coaxial structure to ensure that the axial movement trajectory of the lead screw push rod (2) is not deviated.

4. The automotive bearing extractor according to claim 2, characterized in that: The main body (1) has through holes on its side wall that match the number of connecting rods (12), and the connecting rods (12) are rotatably assembled in the through holes.

5. The automotive bearing extractor according to any one of claims 1-4, characterized in that: The main body (1) has multiple snap-fit ​​bolts (14) evenly distributed around its side wall. The snap-fit ​​bolts (14) can be rotated to fit cylinder liners with different inner diameters.

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