Press fitting mechanism with precise control function
By designing a spherical contact pressure head structure, the press and wheel axle head can be self-aligned, solving the problem of uneven force on the press, improving the service life of the press and reducing machining costs.
Patent Information
- Application Number
- CN202520406663.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-10
AI Technical Summary
The pressure on the press head of the existing press is uneven, which causes the press shaft to bend, deform and wear, affecting its service life.
Design a precision control pressing mechanism. One end of the press head is a ball head that forms a spherical pair with the output end of the press, and the other end has multiple contact points. The free rotation characteristics of the spherical pair are used to achieve adaptive alignment and ensure that the contact points are uniformly stressed.
It effectively prevents the press spindle from bending and deforming, improves the service life of the press, reduces machining costs, and achieves uniform force contact.
Smart Images
Figure CN223876460U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of press-fitting device technology, and specifically relates to a precise control press-fitting mechanism with rear axle adaptive alignment. Background Technology
[0002] The axle is an important component of automobiles or other motor vehicles. It is the transmission system that connects the wheels, transmitting power from the engine to the wheels, enabling the vehicle to move. The rear axle is a type of automobile axle. It has neither steering nor driving functions, and is located at the rear wheels of the vehicle, providing load-bearing and guiding support for the vehicle frame. The rear axle assembly and wheel end system ensure good load-bearing capacity, braking stability, and durability of the entire vehicle. It is a major component of the rear suspension system, connecting springs, the body, shock absorbers, braking units, wheel end interfaces, etc., ensuring overall vehicle stability.
[0003] like Figure 1 The diagram shows the existing press T1 and rear axle assembly press-fit structure. For a rear axle assembly with a tube-type interference fit between the axle tube S1 and the wheel axle head S2, the press T1 is required to press-fit the axle tube S1 and the wheel axle head S2 to achieve the product connection function. However, the press head T2 of the existing press T1 has only one degree of freedom of motion (i.e., linear motion along the main shaft axis of the press), which places strict requirements on the wheel axle head S2 of the rear axle assembly. The force-bearing area in contact with the press head T2 of the press T1 (i.e., multiple contact points, such as...) Figure 2 The areas corresponding to wheel axle heads S2 in T201, T202, and T203 need to be machined, increasing costs. In addition, since machining inevitably involves machining errors, the multiple contact points of the press head T2 of press T1 and the wheel axle head S2 cannot actually contact simultaneously (for example, after one contact point contacts, the other two contact points are in an unsupported state). Therefore, the force is uneven, which will cause the main shaft of press T1 to bend, deform, wear, and affect its service life.
[0004] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] The purpose of this invention is to provide a precise control pressing mechanism that can effectively improve the service life of the press.
[0006] To solve the above-mentioned technical problems, this utility model provides a precise control pressing mechanism, including a press and a pressing head;
[0007] One end of the pressure head is a ball head, and the ball head and the output end of the press form a spherical pair contact; the other end of the pressure head is at least two contact pressure points, and the contact pressure points are in abutment with one of the two components to be pressed; and the press pushes the pressure head to realize the press fitting of the two components to be pressed.
[0008] Optionally, in the precision control press fitting mechanism, the output end of the press is a ball seat with a semispherical recess.
[0009] Optionally, in the precision control press fitting mechanism, the body of the pressure head is in a disc structure, and the ball head and the contact pressure points are respectively located at two ends of the body.
[0010] Optionally, in the precision control press fitting mechanism, the pressure head is in an integral structure.
[0011] Optionally, in the precision control press fitting mechanism, the contact pressure points are a plurality of support claws uniformly distributed on the body.
[0012] Optionally, in the precision control press fitting mechanism, the support claws comprise an inclined section and a vertical section, the inclined section connects the body and the vertical section, the vertical section is vertically arranged relative to the abutment surface of the component to be pressed, and the inclined section and the vertical section are connected at a preset angle.
[0013] Optionally, in the precision control press fitting mechanism, a press positioning and clamping mechanism is further arranged to clamp the two components to be pressed.
[0014] Optionally, in the precision control press fitting mechanism, the two components to be pressed comprise a shaft tube and a wheel shaft head, and the contact pressure points are in abutment with the wheel shaft head.
[0015] Optionally, in the precision control press fitting mechanism, a press workbench is further arranged to provide support.
[0016] Optionally, in the precision control press fitting mechanism, the press and the pressure head each comprise two groups arranged oppositely.
[0017] The precision control press fitting mechanism has the following beneficial effects:
[0018] According to the free rotation characteristic principle of the spherical pair, one end of the pressure head of the press fitting mechanism is designed as a ball head, and the ball head and the output end of the press form a spherical pair contact structure. The contact pressure points at the other end of the pressure head can self-adaptively swing and align until all the contact pressure points are in complete contact with one of the two components to be pressed, thereby completely avoiding the harmful bending deformation of the main shaft of the press, ensuring the contact and uniform force of the contact pressure points of the pressure head and the component to be pressed, and thus a self-adaptive alignment precision control press fitting mechanism is designed, and the service life of the press can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only constitute the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.
[0020] Figure 1 It is a structure schematic diagram of the existing technology of the press and the rear axle assembly press fitting;
[0021] Figure 2 It is a structure schematic diagram of the existing technology of the press head and the rear axle assembly press fitting (only one side is shown);
[0022] Figure 3 It is a structure schematic diagram of the existing technology of the rear axle assembly;
[0023] Figure 4 It is a sectional view of the existing technology of the rear axle assembly press fitting;
[0024] Figure 5 It is a structure schematic diagram of a precise control press fitting mechanism provided by the embodiments of the present application;
[0025] Figure 6 It is a structure schematic diagram of the press head and the rear axle assembly press fitting provided by the embodiments of the present application (only one side is shown).
[0026] In the above figure:
[0027] T1-press; T2-press head; T201, T202, T203-three contact pressure points;
[0028] S1-shaft tube; S2-wheel shaft head;
[0029] 100-press;
[0030] 200-press head;
[0031] 210-ball head; 221-first support claw; 222-second support claw; 223-third support claw;
[0032] 300-press positioning and clamping mechanism;
[0033] 400-rear axle assembly;
[0034] 410-shaft tube; 420-wheel shaft head;
[0035] 500-press workbench. DETAILED DESCRIPTION
[0036] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application.
[0037] The core of the present application is to provide a precise control press-fit mechanism, which can effectively improve the service life of the press.
[0038] In order to enable those skilled in the art to better understand the technical solutions provided by the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.
[0039] Specifically, please refer to Figures 1-6 The present application provides a precise control press-fit mechanism, which comprises a press 100 and a press head 200.
[0040] The press 100 is generally a servo press, which provides accurate axial force and displacement to realize the press-fit function of the rear axle assembly. The output end of the press 100 usually has only one degree of freedom of motion, i.e. linear motion along the spindle axis of the press 100.
[0041] The press head 200 is used to transmit the pressure applied by the spindle of the press 100 to the wheel shaft head 420, and press the wheel shaft head 420 and the shaft tube 410 together. One end of the press head 200 is a ball head 210 which cooperates with the output end of the press 100 to form a spherical pair contact, and the other end of the press head 200 is at least two contact pressure points which are in abutment with one of the two components to be press-fit, and the press-fit of the two components to be press-fit is realized by pushing the press head 200 by the press 100.
[0042] It should be noted that the spherical pair (also known as spherical hinge spherical pair) is a special pair of movements, in which the relative movement of the two components (i.e. the two components to be press-fit) is spherical movement. The feature of this pair of movements is that the contact part can adapt to a larger relative displacement while maintaining good movement precision and stability.
[0043] The precise control press-fit mechanism provided by the present application utilizes the free rotation characteristic principle of the spherical pair, and designs one end of the press head 200 of the press-fit mechanism as a ball head 210 which cooperates with the output end of the press 100 to form a spherical pair contact structure. The contact pressure points at the other end of the press head 200 can adaptively swing and align until all the contact pressure points are in complete contact with one of the two components to be press-fit, completely avoiding harmful bending deformation of the press spindle, ensuring uniform contact and stress of the contact pressure points of the press head 200 and the components to be press-fit, thereby designing a self-adaptive alignment precise control press-fit mechanism which can effectively improve the service life of the press.
[0044] In a specific embodiment, the output end of the press 100 is a ball seat with a hemispherical groove. The hemispherical groove matches the ball head 210, allowing the ball head 210 to move spherically within the hemispherical groove of the ball seat. To prevent the ball head 210 from detaching from the ball seat, an anti-detachment sleeve is provided on the outer side of the ball seat. The anti-detachment sleeve does not restrict the rotation of the ball head 210 but also prevents the ball head 210 from detaching away from the ball seat.
[0045] In a specific embodiment, the body of the pressure head 200 has a disc-shaped structure, particularly a circular structure, with the ball head 210 and the contact pressure point located at both ends of the body.
[0046] To improve structural strength, the pressure head 200 is a one-piece molded structure.
[0047] In one embodiment, the contact pressure point can be a rib provided on the side of the disc-shaped structure, with the rib protruding from the side of the disc-shaped structure, so that the other end of the pressure head 200 can be connected to the component to be pressed only through the contact point.
[0048] In another form, the contact points can be multiple support claws evenly distributed on the body. The support claws protrude from the side of the disc-shaped structure so that the other end of the pressure head 200 can dock with the part to be pressed only through contact points.
[0049] The number of support claws can be two, three, or even more. As shown in the figure, there are three support claws, namely the first support claw 221, the second support claw 222, and the third support claw 223. The three support claws form three pressure points with the part to be pressed.
[0050] In a specific embodiment, such as Figure 6 As shown, the support claw includes an inclined section and a vertical section. The inclined section connects the main body and the vertical section, while the vertical section is perpendicular to the mating surface of the component to be pressed, increasing the contact area between the vertical section and the component and improving stability. The inclined and vertical sections are connected at a preset angle, which is determined according to the specific needs of the actual application, aiming to achieve stable clamping of components of different shapes and sizes. The support claw can be made of a robust metal material with high hardness and wear resistance, capable of withstanding large pressure without deformation or damage, ensuring a continuous and reliable clamping force for the component during long-term use.
[0051] The inclined section gradually expands outward in the direction towards the vertical section, and the plurality of supporting claws on the pressure head 200 form a gradually expanding claw, which helps to more evenly distribute the pressing force when the pressure head 200 applies pressure, thereby improving the stability and reliability of the pressing. In addition, it can also reduce the stress concentration of the supporting claws during the pressing process, reduce the risk of damage to the supporting claws, and prolong their service life. The gradually expanding design can also adjust the size of one end of the pressure head while keeping the size of the other end unchanged, to adapt to different sizes and shapes of the parts to be pressed.
[0052] For the prior art, the force transmission mode of the wheel shaft head of the press head and the rear axle assembly adopts planar contact, and the multiple contact points of the wheel shaft head corresponding to the force of the press head contact need to be machined, increasing the manufacturing cost. By using the ball head 210 and the supporting claw structure in the above specific embodiments, machining can be avoided, and the face difference of general forging or casting is within 3mm. The ball hinge form can self-adaptively cover the face difference fluctuation and does not need machining, and the same purpose of balancing the force of the press head is achieved.
[0053] The present scheme also includes a press positioning and clamping mechanism 300 for clamping two parts to be pressed.
[0054] In particular, when the precise control pressing mechanism is applied to the assembly of the rear axle assembly 400, the two parts to be pressed include the shaft tube 410 and the wheel shaft head 420 of the rear axle assembly 400, and the contact pressure point is in butt joint with the wheel shaft head 420. The press positioning and clamping mechanism 300 is mainly used to position the rear axle assembly 400, and fix the rear axle assembly 400 through the press positioning and clamping mechanism 300. The rear axle assembly 400 is composed of shaft tube 410, wheel shaft head 420, leaf spring seat, shock absorber mounting bracket and other parts, which connects the spring / car body, shock absorber, brake unit, wheel end interface, etc., to ensure the stability of the whole vehicle driving.
[0055] Of course, the present scheme includes but is not limited to the rear axle assembly product, and can also be applied to other products that need to be pressed to realize the interference fit of two parts.
[0056] Through the above settings, a press head structure scheme that is self-adaptive to the complete contact with the wheel shaft head can be provided while maintaining the overall structure of the existing rear axle assembly unchanged.
[0057] The present scheme also includes a press workbench 500 for providing support. The press workbench 500 is mainly used to install and connect the press 100 and the press positioning and clamping mechanism 300.
[0058] One press 100 and one pressure head 200 constitute a set of matched pressing mechanisms. For the rear axle assembly 400, the press 100 and the pressure head 200 each include two sets of relatively arranged groups, and the two sets of pressing mechanisms are arranged at the two ends of the rear axle assembly 400. The two sets of pressing mechanisms are symmetrical.
[0059] The utility model discives a press fitting tool head, which is characterized by the following technical scheme: a ball hinge is arranged on the contact surface of the press fitting tool head, and the contact surface of the press fitting tool head is provided with a plurality of contact pressure points.
[0060] In the description of the present application, the meaning of plurality is more than two, and if the first and the second are described, they are only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0061] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.
[0062] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.
[0063] The principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the utility model, the utility model can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the claims of the utility model.
Claims
1. A precision control press-fit mechanism, characterized by, The device comprises a press (100) and a pressing head (200); One end of the pressing head (200) is a spherical head (210) which cooperates with the output end of the press (100) to form a spherical pair contact, and the other end of the pressing head (200) is at least two contact pressing points which are in abutment with one of the two components to be pressed, and the pressing of the two components to be pressed is realized by pushing the pressing head (200) by the press (100).
2. The precision control press-fit mechanism of claim 1, wherein, The output end of the press (100) is a spherical seat with a semispherical recess.
3. The precision control press-fit mechanism of claim 1, wherein, The body of the pressing head (200) is in a disc structure, and the spherical head (210) and the contact pressing points are respectively located at two ends of the body.
4. The precision control press-fit mechanism of claim 3, wherein, The pressing head (200) is an integral structure.
5. The precision control press-fit mechanism of claim 3, wherein, The contact pressing points are a plurality of support claws which are uniformly distributed on the body.
6. The precision control press-fit mechanism of claim 5, wherein, The support claws comprise an inclined section and a vertical section, the inclined section connects the body and the vertical section, the vertical section is vertically arranged relative to the abutment surface of the component to be pressed, and the inclined section and the vertical section are connected at a preset angle.
7. The precision control press-fit mechanism of claim 1, wherein, The device further comprises a press positioning and clamping mechanism (300) for clamping the two components to be pressed.
8. The precision control press-fit mechanism of claim 7, wherein, The two components to be pressed comprise a shaft tube (410) and a wheel shaft head (420), and the contact pressing points are in abutment with the wheel shaft head (420).
9. The precision control press-fit mechanism of claim 1 or 7, wherein, The device further comprises a press workbench (500) for providing support.
10. The precision control press-fit mechanism of claim 7, wherein, The press (100) and the pressing head (200) each comprise two groups which are oppositely arranged.