Single bushing press-fitting tool and steering knuckle assembly bushing press-fitting method

Abstract

The present application relates to a single-bushing pressing tool and a method for pressing a bushing of a steering knuckle assembly, wherein a first guide limit shaft is coaxially fixedly connected to the bottom of a pressing core shaft; the outside of the pressing core shaft is used for sleeve-mounting the bushing; a second guide limit shaft is coaxially detachably connected to the top of the pressing core shaft; a supporting space for supporting the bushing up and down is formed between the bottom end surface of the second guide limit shaft and the top end surface of the first guide limit shaft; the diameter of the part of the second guide limit shaft used to extend into the main pin hole and the diameter of the first guide limit shaft are equal to the outer diameter of the bushing; the top and bottom of the bushing are clamped by the above structure to balance the force; in addition, the diameter of the part of the second guide limit shaft used to extend into the main pin hole and the diameter of the first guide limit shaft are equal to the outer diameter of the bushing, and when the bushing is located on the pressing core shaft, an integral lengthened guide structure is formed to solve the problems of high risk of deformation during the pressing process and poor bore diameter and coaxiality of the bushing when pressing a single bushing.

Description

Technical Field

[0001] The present application relates to the technical field of knuckle bushing press-fitting, and in particular to a single bushing press-fitting tool and a knuckle assembly bushing press-fitting method. Background Art

[0002] The steering knuckle assembly is a part used in automobiles. It includes a shaft end and a frame end. The shaft end is provided with a steering knuckle bearing position, and the frame end is provided with two steering knuckle fork ears. The two fork ears are respectively provided with a kingpin hole for the kingpin to pass through. An interference fit bushing needs to be installed in the kingpin hole.

[0003] In some related technologies, some commercial vehicle steering knuckle assemblies have two bushings pressed into the two kingpin holes of the upper and lower ears respectively, for a total of two bushings, but some steering knuckle assemblies have only one bushing pressed into the upper ear kingpin hole; to meet assembly requirements, after a single bushing is pressed into place, it is necessary to ensure the inner hole diameter of the bushing and the coaxiality of the bushing relative to the bottom hole of the lower ear kingpin hole. However, since the bottom hole of the kingpin hole and the bushing are processed in two different steps, the inner hole of the upper ear bushing and the bottom hole of the lower ear kingpin hole are not related during processing, and the force is uneven when the single bushing is pressed into place, the bushing guide stroke is short, and the risk of deformation during the pressing process is high, resulting in poor inner hole diameter and coaxiality of the bushing after the single bushing is pressed into place.

[0004] In order to solve the above problems, a single bushing press-fitting tool and a steering knuckle assembly bushing press-fitting method are proposed. Summary of the invention

[0005] The embodiments of the present application provide a single bushing pressing tool and a steering knuckle assembly bushing pressing method to solve the problems in the related art of uneven force during single bushing pressing, short bushing guide stroke, high risk of deformation during pressing, and poor bushing inner hole diameter and coaxiality.

[0006] In a first aspect, a single bushing press tool is provided, comprising:

[0007] A press-fitting mandrel, the bottom of which is coaxially fixedly connected with a first guide limit shaft; the outer portion of the press-fitting mandrel is used for sleeve-mounting a bushing;

[0008] The second guide limit shaft is coaxially and detachably connected to the top of the press-fitting core shaft; a supporting space for upper and lower supporting bushings is formed between the bottom end surface of the second guide limit shaft and the top end surface of the first guide limit shaft; the diameter of the part of the second guide limit shaft that extends into the main pin hole is equal to the diameter of the first guide limit shaft and the outer diameter of the bushing.

[0009] In some embodiments, a connecting shaft is provided on the top of the press-fitting mandrel;

[0010] The second guide limit shaft comprises a guide portion and a main pin hole baffle portion, wherein the main pin hole baffle portion is arranged above the guide portion; a through hole penetrating the central axis of the second guide limit shaft is provided on the guide portion and the main pin hole baffle portion;

[0011] A locking piece is provided on the main pin hole baffle portion; the connecting shaft extends into the through hole and rotates in the through hole; the connecting shaft is detachably connected to the main pin hole baffle portion through the locking piece.

[0012] In some embodiments, the connecting shaft includes circular baffles spaced apart from each other, and a first flat portion vertically arranged outside the circumference of the circular baffle is provided; a circular shaft is provided between the two circular baffles to enclose a limiting groove; the circular shaft is concentrically arranged with the circular baffle; and a projection of the circular shaft on the bottom circular baffle is located in the top surface area of ​​the bottom circular baffle;

[0013] The main pin hole baffle portion is provided with a through hole arranged along the radial direction of the through hole; the locking member is a limiting rod, the limiting rod is arranged in the through hole and is used to extend into the limiting groove.

[0014] In some embodiments, the through hole is a threaded hole, and the limiting rod is a screw rod.

[0015] In some embodiments, a second flat portion is vertically arranged on the outer side of the main pin hole baffle portion; a rotating block is provided at one end of the screw away from the limiting groove, and the rotating block is used to fit with the second flat portion.

[0016] In some embodiments, the connecting shaft includes circular baffles spaced apart from each other; a circular shaft is disposed between the two circular baffles to enclose a limiting groove; the circular shaft is disposed concentrically with the circular baffles; and the diameter of the circular shaft is smaller than the diameter of the circular baffles;

[0017] The main pin hole baffle portion is provided with a through hole arranged along the radial direction of the through hole; the locking member includes a limiting rod; the limiting rod is arranged in the through hole, and one end of the limiting rod is used to extend into the limiting groove, and the other end is sleeved with a spring; one end of the spring is fixedly connected to the limiting rod, and the other end is fixedly connected to the outer side of the main pin hole baffle portion.

[0018] In some embodiments, the diameter of the main pin hole baffle portion is greater than the diameter of the guide portion, and the diameter of the main pin hole baffle portion is greater than the diameter of the main pin hole.

[0019] In some embodiments, the distance between the ground surface of the main pin hole baffle portion and the top end surface of the first guide limit shaft is equal to the length of the main pin hole.

[0020] In some embodiments, a chamfer is provided at the bottom end of the first guide limiting shaft.

[0021] In a second aspect, a method for pressing a bushing of a steering knuckle assembly is provided, which comprises the following steps:

[0022] Single bushing press-fitting tool is available;

[0023] Separate the second guide limit shaft of the single bushing press-fitting tool from the press-fitting mandrel, and then sleeve the bushing on the press-fitting mandrel;

[0024] Connecting the press-fitting mandrel and the press-fitting mandrel;

[0025] Align the first guide limit shaft with the kingpin hole; then press the single bushing press tool into the kingpin hole until the portion of the second guide limit shaft that is used to extend into the kingpin hole completely enters the kingpin hole;

[0026] After the press-fitting is completed, the second guide limiting shaft is separated from the press-fitting mandrel again.

[0027] The beneficial effects of the technical solution provided by this application include:

[0028] The embodiment of the present application provides a single bushing pressing tool and a method for pressing a bushing of a steering knuckle assembly, wherein a first guide limit shaft is coaxially fixedly connected to the bottom of a pressing mandrel; the outside of the pressing mandrel is used to sleeve the bushing; a second guide limit shaft is coaxially detachably connected to the top of the pressing mandrel; a supporting space for supporting the upper and lower bushings is formed between the bottom end surface of the second guide limit shaft and the top end surface of the first guide limit shaft; the diameter of the portion of the second guide limit shaft used to extend into the main pin hole and the diameter of the first guide limit shaft are equal to the outer diameter of the bushing; the top and bottom of the bushing are clamped by the above structure to balance the force; in addition, the diameter of the portion of the second guide limit shaft used to extend into the main pin hole and the diameter of the first guide limit shaft are equal to the outer diameter of the bushing, and when the bushing is located on the pressing mandrel, an integral lengthened guide structure is formed, thereby solving the problems of uneven force and short bushing guide stroke during press-fitting of a single bushing, resulting in a high risk of deformation during the pressing process, and poor bushing inner hole diameter and coaxiality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 It is a press-fitting method provided in the related art;

[0031] Figure 2 A schematic diagram of the state before press-fitting provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the state after press-fitting provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the three-dimensional structure of a single bushing press-fitting tool provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the three-dimensional structure of a single bushing press-fitting tool from another perspective provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the unlocked state of the locking member provided in the embodiment of the present application;

[0036] Figure 7 A schematic diagram of a locking state of a locking member provided in an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of the structure of the connecting shaft and the press-fitting mandrel provided in an embodiment of the present application.

[0038] In the figure: 1, press-fitting core shaft; 2, first guide limit shaft; 3, second guide limit shaft; 300, guide part; 301, main pin hole baffle part; 302, through hole; 303, second flat part; 4, bushing; 5, main pin hole; 6, connecting shaft; 600, circular baffle; 601, first flat part; 602, round shaft; 7, locking piece; 8, chamfer; 9, steering knuckle assembly. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] For the problems of uneven force during single bushing press-fitting proposed in this application, high risk of deformation during press-fitting caused by poor bushing guidance, and poor bushing inner hole diameter and coaxiality, please refer to Figure 1 , to explain:

[0041] The current bushing press-fitting tool a only applies force to the upper end face b of the bushing, while the lower end face d is not subjected to force, which will lead to uneven force during press-fitting. In addition, the guidance during press-fitting only relies on the chamfer c of the bushing and the kingpin hole, and the guidance is far from the end, resulting in poor guidance.

[0042] Therefore, a single bushing pressing tool and a steering knuckle assembly bushing pressing method are proposed to solve the problems of uneven force during single bushing pressing, high risk of deformation during pressing due to poor bushing guiding, and poor bushing inner hole diameter and coaxiality in related technologies.

[0043] See also Figure 2-Figure 8 , a single bushing press-fitting tool, comprising:

[0044] A press-fitting mandrel 1, the bottom of which is coaxially fixedly connected with a first guide limiter shaft 2; the outer portion of the press-fitting mandrel 1 is used for sleeve-mounting a bushing 4;

[0045] The second guide limit shaft 3 is coaxially and detachably connected to the top of the press-fitting core shaft 1; a supporting space for upper and lower supporting bushings 4 is formed between the bottom end surface of the second guide limit shaft 3 and the top end surface of the first guide limit shaft 2; the diameter of the part of the second guide limit shaft 3 that extends into the main pin hole 5 is equal to the diameter of the first guide limit shaft 2 and the outer diameter of the bushing 4.

[0046] The top and bottom of the bushing 4 are clamped by the above structure to balance the force. In addition, the diameter of the part of the second guide limit shaft 3 extending into the main pin hole 5 and the diameter of the first guide limit shaft 2 are equal to the outer diameter of the bushing 4. When the bushing 4 is located on the pressing core shaft 1, an integral lengthened guide structure is formed, thereby solving the problems of uneven force during press-fitting of a single bushing, short bushing guide stroke, high risk of deformation during pressing, and poor bushing inner hole diameter and coaxiality.

[0047] You can refer to Figure 4-Figure 8 , the structure of the single bushing press tool is specifically described:

[0048] A connecting shaft 6 is provided on the top of the press-fitting mandrel 1;

[0049] The second guide and limit shaft 3 includes a guide portion 300 and a main pin hole baffle portion 301, wherein the main pin hole baffle portion 301 is arranged above the guide portion 300; a through hole 302 penetrating the central axis of the second guide and limit shaft 3 is provided on the guide portion 300 and the main pin hole baffle portion 301;

[0050] A locking piece 7 is provided on the main pin hole baffle portion 301 ; the connecting shaft 6 extends into the through hole 302 and rotates in the through hole 302 ; the connecting shaft 6 is detachably connected to the main pin hole baffle portion 301 via the locking piece 7 .

[0051] The connection structure between the press-fitting mandrel 1 and the second guide and limit shaft 3 is described above, and can be disassembled so that the press-fitting mandrel 1 and the second guide and limit shaft 3 can be separated and disassembled.

[0052] In some preferred embodiments, in order to make the press-fitting process unnecessary to consider the press-fitting depth, the following settings are provided:

[0053] The diameter of the main pin hole baffle 301 is larger than the diameter of the guide portion 300, and the diameter of the main pin hole baffle 301 is larger than the diameter of the main pin hole 5. The distance between the ground of the main pin hole baffle 301 and the top end surface of the first guide limit shaft 2 is equal to the length of the main pin hole 5.

[0054] The press-fitting is completed only by the kingpin hole baffle portion 301 and the top of the steering knuckle being in contact, thereby ensuring the press-fitting quality during the press-fitting process.

[0055] Furthermore, in order to facilitate alignment with the main pin hole 5 during the press-fitting process, the bottom end of the first guide limit shaft 2 is provided with a chamfer 8. The chamfer 8 facilitates the alignment of the first guide limit shaft 2 and the main pin hole 5.

[0056] In some preferred embodiments, there are two specific ways for the locking member 7 to be disassembled and connected:

[0057] The first type is that the connecting shaft 6 includes circular baffles 600 spaced apart from each other, and a first flat portion 601 arranged vertically is arranged on the outer side of the circular baffle 600; a circular shaft 602 is arranged between the two circular baffles 600 to enclose a limiting groove; the circular shaft 602 is arranged concentrically with the circular baffle 600; and the projection of the circular shaft 602 on the bottom circular baffle 600 is located in the top surface area of ​​the bottom circular baffle 600;

[0058] A through hole is provided on the main pin hole baffle portion 301 along the radial direction of the through hole 302; the locking member 7 is a limiting rod, which is provided in the through hole and is used to extend into the limiting groove.

[0059] When locking is required, the connecting shaft 6 is rotated so that the two circular baffles 600 are respectively located at the upper and lower sides directly opposite the locking member 7, so that when there is a vertical displacement, the locking member 7 is limited; when unlocking is required, the connecting shaft 6 is rotated so that the two circular baffles 600 are away from the locking member 7. At this time, the first flat portion 601 provides a space for escape, that is, the locking member 7 is not in the limiting groove at this time, so when there is a vertical displacement, the circular baffles 600 will not be limited. Figure 6 and Figure 7 shown.

[0060] The through hole is a threaded hole, and the limiting rod is a screw rod, so that when the limiting rod is subjected to force, no shaking occurs.

[0061] Furthermore, a second flat portion 303 is vertically arranged on the outer side of the main pin hole baffle portion 301; a rotating block is arranged at one end of the screw away from the limiting groove, and the rotating block is used to fit with the second flat portion 303. Such a configuration allows the rotating block of the screw to fit with the second flat portion 303, increasing the contact surface and facilitating the limiting and rotation.

[0062] The second type is that the connecting shaft 6 includes circular baffles 600 spaced apart from each other; a circular shaft 602 is provided between the two circular baffles 600 to enclose a limiting groove; the circular shaft 602 is concentrically arranged with the circular baffle 600; and the diameter of the circular shaft 602 is smaller than the diameter of the circular baffle 600;

[0063] The main pin hole baffle portion 301 is provided with a through hole arranged along the radial direction of the through hole 302; the locking member 7 includes a limiting rod; the limiting rod is arranged in the through hole, and one end of the limiting rod is used to extend into the limiting groove, and the other end is sleeved with a spring; one end of the spring is fixedly connected to the limiting rod, and the other end is fixedly connected to the outer side of the main pin hole baffle portion 301.

[0064] When locking is required, there is no need to pull the limit rod, the limit rod is located in the limit slot, and limits are performed up and down; when unlocking is required, the limit rod is pulled, and the limit rod withdraws from the limit slot, thereby canceling the limit. The above locking is normal through the spring.

[0065] In the above two structural forms, the diameter of the limiting rod is equal to the width of the limiting groove.

[0066] The present application also provides a method for pressing a steering knuckle assembly bushing, which comprises the following steps:

[0067] Step 100, providing a single bushing press-fitting tool;

[0068] Step 101, separating the second guide limiting shaft 3 of the single bushing press-fitting tool from the press-fitting mandrel 1, and then sleeve the bushing 4 on the press-fitting mandrel 1;

[0069] Step 102, connecting the press-fitting mandrel 1 and the press-fitting mandrel 1;

[0070] Step 103, align the first guide limit shaft 2 with the kingpin hole 5; then press the single bushing press-fitting tool into the kingpin hole 5 until the portion of the second guide limit shaft 3 that is used to extend into the kingpin hole 5 completely enters the kingpin hole 5;

[0071] Step 104: After the press-fitting is completed, the second guide limit shaft 3 is separated from the press-fitting mandrel 1 again to facilitate the next press-fitting.

[0072] Because the single bushing pressing tool limits the upper and lower end faces of the bushing 4 and lengthens the guide stroke to ensure the stability of the bushing pressing process, the single bushing is subjected to uneven force and the bushing guide stroke is short during pressing, resulting in a high risk of deformation during the pressing process and poor bushing inner hole diameter and coaxiality.

[0073] In addition, after the pressing is completed, it is also convenient to disassemble and separate the single bushing pressing tool and repeat the next pressing operation to adapt to the scenario where the two kingpin holes of the upper and lower ears of the steering knuckle assembly 9 of some commercial vehicles are respectively pressed with one bushing, and a total of two bushings are pressed, but some steering knuckle assemblies 9 only have one bushing pressed in the upper ear kingpin hole.

[0074] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0075] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0076] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A single bushing press tool, characterized in that: It includes: A press-fitting mandrel (1) has a bottom coaxially fixedly connected with a first guide limiter shaft (2); the outside of the press-fitting mandrel (1) is used for sleeve-mounting a bushing (4); The second guide limit shaft (3) is coaxially and detachably connected to the top of the press-fitting core shaft (1); a supporting space for upper and lower supporting bushings (4) is formed between the bottom end surface of the second guide limit shaft (3) and the top end surface of the first guide limit shaft (2); the diameter of the part of the second guide limit shaft (3) used to extend into the main pin hole (5) is equal to the diameter of the first guide limit shaft (2) and the outer diameter of the bushing (4).

2. The single bushing press tool according to claim 1, characterized in that: A connecting shaft (6) is provided on the top of the press-fitting mandrel (1); The second guide and limit shaft (3) comprises a guide portion (300) and a main pin hole baffle portion (301), wherein the main pin hole baffle portion (301) is arranged above the guide portion (300); a through hole (302) penetrating the central axis of the second guide and limit shaft (3) is provided on the guide portion (300) and the main pin hole baffle portion (301); The main pin hole baffle portion (301) is provided with a locking piece (7); the connecting shaft (6) extends into the through hole (302) and rotates in the through hole (302); the connecting shaft (6) is detachably connected to the main pin hole baffle portion (301) via the locking piece (7).

3. The single bushing press tool according to claim 2, characterized in that: The connecting shaft (6) comprises circular baffles (600) arranged at intervals in the upper and lower parts, and a first flat portion (601) arranged vertically is arranged on the outer side of the circumference of the circular baffle (600); a circular shaft (602) is arranged between the two circular baffles (600) to enclose a limiting groove; the circular shaft (602) and the circular baffle (600) are arranged concentrically; and the projection of the circular shaft (602) on the bottom circular baffle (600) is located in the top surface area of ​​the bottom circular baffle (600); The main pin hole baffle portion (301) is provided with a through hole arranged along the radial direction of the through hole (302); the locking member (7) is a limiting rod, which is arranged in the through hole and is used to extend into the limiting groove.

4. The single bushing press tool according to claim 3, characterized in that: The through hole is a threaded hole, and the limiting rod is a screw rod.

5. The single bushing press tool according to claim 4, characterized in that: A second flat portion (303) arranged vertically is provided on the outer side of the main pin hole baffle portion (301); a rotating block is provided at one end of the screw rod away from the limiting groove, and the rotating block is used to fit with the second flat portion (303).

6. The single bushing press tool according to claim 3, characterized in that: The connecting shaft (6) comprises circular baffles (600) spaced apart from each other; a circular shaft (602) is arranged between the two circular baffles (600) to enclose a limiting groove; the circular shaft (602) and the circular baffle (600) are arranged concentrically; the diameter of the circular shaft (602) is smaller than the diameter of the circular baffle (600); The main pin hole baffle portion (301) is provided with a through hole arranged along the radial direction of the through hole (302); the locking member (7) includes a limiting rod; the limiting rod is arranged in the through hole, and one end of the limiting rod is used to extend into the limiting groove, and the other end is sleeved with a spring; one end of the spring is fixedly connected to the limiting rod, and the other end is fixedly connected to the outer side of the main pin hole baffle portion (301).

7. The single bushing press tool according to claim 2, characterized in that: The diameter of the main pin hole baffle portion (301) is greater than the diameter of the guide portion (300), and the diameter of the main pin hole baffle portion (301) is greater than the diameter of the main pin hole (5).

8. The single bushing press tool according to claim 7, characterized in that: The distance between the ground surface of the main pin hole baffle portion (301) and the top end surface of the first guide limit axis (2) is equal to the length of the main pin hole (5).

9. The single bushing press tool according to claim 1, characterized in that: The bottom end of the first guide limiting shaft (2) is provided with a chamfer (8).

10. A method for pressing a bushing of a steering knuckle assembly, characterized in that: It includes the following steps: Providing a single bushing press tool as described in any one of claims 1 to 9; The second guide limiting shaft (3) of the single bushing press-fitting tool is separated from the press-fitting mandrel (1), and then the bushing (4) is sleeved on the press-fitting mandrel (1); Connecting the press-fitting mandrel (1) and the press-fitting mandrel (1); Align the first guide limit shaft (2) with the main pin hole (5); then press the single bushing press tool into the main pin hole (5) until the portion of the second guide limit shaft (3) that is used to extend into the main pin hole (5) completely enters the main pin hole (5); After the press-fitting is completed, the second guide limiting shaft (3) is separated from the press-fitting mandrel (1) again.

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