Single-bushing extrusion tool and device and knuckle assembly bushing press-fitting method

Abstract

The invention relates to a single bush extrusion tool and device and a knuckle assembly bush press-fitting method. A first guide sleeve flush with the top face of a clamp base is arranged on the clamp base; a second guide sleeve is concentrically arranged on the top end surface of the first guide sleeve; the outer diameter of the second guide sleeve is smaller than that of the first guide sleeve and is equal to the diameter of an upper lug main pin hole of the steering knuckle; the top end face of the second guide sleeve is a lining abutting face. The inner diameters of the first guide sleeve and the second guide sleeve are slightly greater than the diameter of the extrusion rod guide section; during use, the second guide sleeve is inserted into the main pin hole of the upper lug of the steering knuckle, the top of the second guide sleeve abuts against the top of the lining in the main pin hole of the upper lug, the bottom face of the upper lug of the steering knuckle is attached to the top face of the first guide sleeve and the top face of the clamp base, the extrusion rod guide section extends into the clamp base to complete extrusion, and the upper lug of the steering knuckle and the clamp base are conveniently positioned through the second guide sleeve. It is guaranteed that the extrusion bar is coaxial with the upper lug of the steering knuckle, the second guide sleeve and the first guide sleeve, the second guide sleeve provides vertical supporting to avoid downward movement, and the requirement for the coaxiality of the extrusion lining is met.

Description

Technical Field

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

[0002] At present, the steering knuckle assembly is one of the important parts in the steering axle of the automobile, which can make the automobile run stably and transmit the driving direction sensitively. The bushing is pressed into the pin hole of the steering knuckle to reduce wear. The single bushing steering knuckle assembly structure includes a coaxial sleeve-shaped upper ear and a lower ear set on the bracket; in some commercial vehicle steering knuckle assemblies, only the upper ear kingpin hole has two kingpin holes in the upper and lower ears. The bushing in the upper ear kingpin hole is radially squeezed and expanded to a suitable inner diameter through the axial movement of the extrusion rod structure, and the lower ear kingpin hole is press-fitted with a needle bearing.

[0003] To ensure smooth assembly, the inner diameter of the upper ear kingpin hole and the coaxiality of the bushing inner hole relative to the lower ear kingpin hole must be ensured after press-fitting. However, since the bushing inner hole is used as a guide during the axial movement of the extruded rod structure, it has no direct connection with the upper ear inner kingpin hole, making it difficult to ensure the coaxiality of the bushing and the upper ear kingpin hole after extrusion. In addition, the position of the steering knuckle assembly will also shift during the extrusion process, and there is also a risk of the bushing moving downward. Summary of the invention

[0004] The embodiments of the present application provide a single bushing extrusion tool, device, and steering knuckle assembly bushing press-fitting method to solve the problem in the related art that the inner hole of the bushing is used as a guide during the axial movement of the extruded rod structure, and has no direct connection with the kingpin hole in the upper ear, resulting in difficulty in ensuring the coaxiality of the bushing and the kingpin hole in the upper ear after extrusion, and there is also a risk of the bushing moving downward.

[0005] In a first aspect, a single bushing extrusion tool is provided, comprising:

[0006] The first guide sleeve has a second guide sleeve concentrically disposed on its top end surface; the outer diameter of the second guide sleeve is smaller than the outer diameter of the first guide sleeve, and the outer diameter of the second guide sleeve is equal to the diameter of the main pin hole of the upper ear of the steering knuckle; the top end surface of the second guide sleeve is a bushing abutment surface; the inner diameters of the first guide sleeve and the second guide sleeve are slightly larger than the diameter of the rod extrusion guide section;

[0007] The first guide sleeve is installed on the top surface of the fixture base through the guide sleeve installation hole.

[0008] In some embodiments, there are multiple first guide sleeves, and they are selectively installed on the fixture base; the number of the second guide sleeves is equal to the number of the first guide sleeves, and the outer diameter of each second guide sleeve is different.

[0009] In some embodiments, the top surface of the fixture base is located on the same horizontal plane as the top surface of the first guide sleeve, and is used to fit with the bottom surface of the upper ear of the steering knuckle;

[0010] The single bushing extrusion tooling also includes a backing plate, on which a through hole having an outer diameter equal to that of the second guide sleeve is provided; the backing plate is sleeved on the second guide sleeve through the through hole and is located on the top surface of the fixture base;

[0011] The thickness of the backing plate is smaller than the length of the second guide sleeve.

[0012] In some embodiments, the outer ring of the guide sleeve mounting hole is provided with a limiting step connected thereto; the first guide sleeve is provided with a positioning ring that is flush with and concentric with the top thereof; and the positioning ring is located in the limiting step.

[0013] In some embodiments, the projection of the backing plate on the top surface of the fixture base covers the top end surfaces of the first guide sleeve and the positioning ring.

[0014] In some embodiments, the clamp base includes two horizontal parts and a vertical part; two ends of the vertical part are respectively connected to a horizontal part to form a accommodating space for the lower ear of the steering knuckle.

[0015] In some embodiments, a reinforcing rib is provided at the connection between the vertical portion and the horizontal portion.

[0016] In a second aspect, a single bushing extrusion device is provided, comprising:

[0017] Single bushing extrusion tooling;

[0018] The extrusion assembly comprises an extrusion rod, wherein the extrusion rod comprises an extrusion rod installation section, an extrusion rod cutting section and an extrusion rod guide section which are sequentially connected from top to bottom; the diameters of the extrusion rod installation section and the extrusion rod guide section are equal to the inner diameter of the bushing.

[0019] In some embodiments, the length of the rod extrusion guide section is greater than or equal to the sum of the lengths of the first guide sleeve and the second guide sleeve; the number of cutting edges of the rod extrusion cutting section is greater than or equal to the designed value.

[0020] In a third aspect, a method for pressing a bushing of a steering knuckle assembly is provided, comprising:

[0021] Provide a single bushing extrusion device;

[0022] Installing the first guide sleeve connected to the second guide sleeve on the fixture base;

[0023] Place the steering knuckle without the bushing pressed on the fixture base, so that the second guide sleeve is inserted into the main pin hole of the upper ear of the steering knuckle, and the top of the second guide sleeve abuts against the top of the bushing;

[0024] Align the extrusion rod of the extrusion assembly with the second guide sleeve, and then move it vertically to the designed position to complete the extrusion expansion of the bushing.

[0025] The beneficial effects of the technical solution provided by this application include:

[0026] The embodiment of the present application provides a single bushing extrusion tool, device, and steering knuckle assembly bushing press-fitting method. Since a first guide sleeve is installed on the fixture base, the top surface of the fixture base and the top surface of the first guide sleeve are located on the same horizontal plane and are used to fit with the bottom surface of the steering knuckle upper ear; a second guide sleeve is concentrically provided on the top surface of the first guide sleeve; the outer diameter of the second guide sleeve is smaller than the outer diameter of the first guide sleeve, and the outer diameter of the second guide sleeve is equal to the diameter of the main pin hole of the steering knuckle upper ear; the top surface of the second guide sleeve is the bushing abutment surface; the first guide sleeve and the second guide sleeve are connected to each other. The inner diameter of the sleeve is slightly larger than the diameter of the rod extrusion guide section; when in use, the steering knuckle without the bushing is placed on the fixture base so that the second guide sleeve is inserted into the main pin hole of the steering knuckle upper ear, and the top is abutted against the top of the bushing; then the rod extrusion guide section of the rod extrusion extends into the first guide sleeve and the second guide sleeve to complete the extrusion. The above process can complete the positioning of the steering knuckle upper ear and the fixture base through the second guide sleeve, while ensuring that the extruded rod is guided by the steering knuckle upper ear, the second guide sleeve and the first guide sleeve to ensure coaxiality, and the second guide sleeve provides support for the bushing to prevent it from moving downward. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A schematic diagram of a state of pressing a knuckle assembly bushing using a single bushing extrusion device provided in an embodiment of the present application;

[0029] Figure 2 A schematic diagram of the structure of a single bushing extrusion tooling provided in an embodiment of the present application;

[0030] Figure 3 A simplified diagram of the use state of the second guide sleeve provided in the embodiment of the present application when the length is relatively long;

[0031] Figure 4 This is a simplified diagram of the usage status of the second guide sleeve provided in an embodiment of the present application when the length is shorter.

[0032] In the figure: 1, first guide sleeve; 2, second guide sleeve; 3, fixture base; 4, pad; 5, reinforcing rib; 6, extrusion rod; 600, extrusion rod installation section; 601, extrusion rod cutting section; 602, extrusion rod guide section. DETAILED DESCRIPTION

[0033] 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.

[0034] The embodiments of the present application provide a single bushing extrusion tool, device, and steering knuckle assembly bushing press-fitting method to solve the problem in the related art that the inner hole of the bushing is used as a guide during the axial movement of the extruded rod structure, and has no direct connection with the kingpin hole in the upper ear, resulting in difficulty in ensuring the coaxiality of the bushing and the kingpin hole in the upper ear after extrusion, and there is also a risk of the bushing moving downward.

[0035] See also Figure 1-Figure 2 , a single bushing extrusion tool, comprising:

[0036] The first guide sleeve 1 has a second guide sleeve 2 concentrically disposed on its top surface; the outer diameter of the second guide sleeve 2 is smaller than the outer diameter of the first guide sleeve 1, and the outer diameter of the second guide sleeve 2 is equal to the diameter of the main pin hole of the upper ear of the steering knuckle; the top surface of the second guide sleeve 2 is a bushing abutment surface; the inner diameters of the first guide sleeve 1 and the second guide sleeve 2 are slightly larger than the diameter of the rod extrusion guide section 602;

[0037] The first guide sleeve 1 is installed on the top surface of the fixture base 3 through the guide sleeve installation hole; the top surface of the fixture base 3 and the top end surface of the first guide sleeve 1 are located on the same horizontal plane and are used to fit with the bottom surface of the upper ear of the steering knuckle.

[0038] When in use, the steering knuckle without the bushing squeezed out is placed on the fixture base 3, so that the second guide sleeve 2 is inserted into the main pin hole of the upper ear of the steering knuckle, and the top is against the top of the bushing, so as to ensure that the upper ear of the steering knuckle and the fixture base 3 can be positioned through the second guide sleeve 2, and the fixture base 3 provides a press-fitting position; then the extrusion rod guide section of the extrusion rod 6 is extended into the first guide sleeve 1 and the second guide sleeve 2 to complete the extrusion; during the extension process, the extrusion rod guide section is guided by the upper ear of the steering knuckle, the second guide sleeve 2 and the first guide sleeve 1 to ensure coaxiality, and the second guide sleeve 2 provides support for the bushing to prevent it from moving downward. This solves the problem that the inner hole of the bushing is used as a guide during the axial movement of the extrusion rod structure, and has no direct connection with the main pin hole in the upper ear, resulting in the difficulty in ensuring the coaxiality of the bushing and the main pin hole of the upper ear after extrusion, and the risk of the bushing moving downward.

[0039] In some preferred embodiments, in order to improve the versatility of the single bushing extrusion tooling, different sizes of main pin holes can be adapted, and the following settings are provided:

[0040] There are multiple first guide sleeves 1, and they are selectively installed on the fixture base 3; the number of second guide sleeves 2 is equal to the number of first guide sleeves 1, and the outer diameter of each second guide sleeve 2 is different.

[0041] refer to Figure 3 and Figure 4 In some preferred embodiments, the above only defines that the second guide sleeve 2 is inserted into the upper ear of the steering knuckle for positioning, and then the top end surface of the second guide sleeve 2 is the bushing abutment surface to support the bushing. However, in actual use, different lengths of the second guide sleeve 2 will cause different problems:

[0042] The first one is that when the length of the second guide sleeve 2 is shorter, the top surface of the clamp base 3 and the top end surface of the first guide sleeve 1 are located on the same horizontal plane, and are used to fit with the bottom surface of the steering knuckle upper ear; that is, to ensure that the steering knuckle upper ear does not move, the bottom of the steering knuckle upper ear needs to fit with the clamp base 3 and the top surface of the first guide sleeve 1, so there is a problem of too short guide length.

[0043] The second type is that when the length of the second guide sleeve 2 is shorter, after the second guide sleeve 2 is inserted into the supporting sleeve, there is a certain gap between the bottom of the upper ear of the steering knuckle and the bottom surface of the clamp base 3. Although a certain guide length is guaranteed, after being subjected to force during the extrusion process, the upper ear of the steering knuckle will be offset in the front, rear, left and right directions due to the gap, which will act on the second guide sleeve 2, resulting in excessive local pressure on the second guide sleeve 2 and deformation.

[0044] Therefore, in order to improve the force on the workpiece during press-fitting, ensure the stability of the press-fitting process, and avoid the coaxiality affected by the deformation of the workpiece, the following settings are made:

[0045] The top surface of the clamp base 3 is located on the same horizontal plane as the top surface of the first guide sleeve 1, and is used to fit with the bottom surface of the upper ear of the steering knuckle;

[0046] The single bushing extrusion tooling also includes a backing plate 4, on which a through hole having an outer diameter equal to that of the second guide sleeve 2 is provided; the backing plate 4 is sleeved on the second guide sleeve 2 through the through hole and is located on the top surface of the fixture base 3;

[0047] The thickness of the backing plate 4 is smaller than the length of the second guide sleeve 2 .

[0048] The above arrangement ensures that when the upper ear of the steering knuckle is subjected to a force that is biased to the left or right relative to the fixture base 3, the pad 4 blocks it, that is, at this time, the force acts on the pad 4, and does not act on the second guide sleeve 2. In addition, the pad 4 also serves to place the wear fixture base 3.

[0049] Therefore, under the effect of ensuring the guide length, the force on the workpiece during press-fitting is improved, the press-fitting process is guaranteed to be stable, and the coaxiality affected by the deformation of the workpiece is avoided.

[0050] Of course, the first situation mentioned above is also retained in this application and is also within the scope of protection of this application.

[0051] In some preferred embodiments, in order to facilitate the replacement of the first guide sleeve 1 and provide a stable installation point for the first guide sleeve 1 without vertical displacement, the following settings are provided:

[0052] The outer ring of the guide sleeve mounting hole is provided with a limiting step connected thereto; the first guide sleeve 1 is provided with a positioning ring which is flush with and concentric with the top thereof; the positioning ring is located in the limiting step.

[0053] Of course, in one embodiment, due to the presence of the limiting step, it is necessary to ensure that the projection of the pad 4 on the top surface of the fixture base 3 covers the top surfaces of the first guide sleeve 1 and the positioning ring. At this time, the pad 4 can completely press the first guide sleeve 1 and be restricted in the guide sleeve installation hole to prevent it from deflecting after being stressed.

[0054] In some preferred embodiments, in order to facilitate the placement of the upper ear of the steering knuckle on the fixture base 3, the lower ear of the steering knuckle and the fixture base 3 are interfered with by the following settings:

[0055] The fixture base 3 includes two horizontal parts and a vertical part; both ends of the vertical part are respectively connected to a horizontal part to form a accommodating space for the lower ear of the steering knuckle.

[0056] Furthermore, in order to improve the overall structural strength of the clamp base 3, a reinforcing rib 5 is provided at the connection between the vertical portion and the horizontal portion.

[0057] The present application also proposes a single bushing extrusion device, which comprises:

[0058] Single bushing extrusion tooling;

[0059] The extrusion assembly includes an extrusion rod 6, which includes an extrusion rod installation section 600, an extrusion rod cutting section 601 and an extrusion rod guide section 602 connected in sequence from top to bottom; the diameters of the extrusion rod installation section 600 and the extrusion rod guide section 602 are equal to the inner diameter of the bushing.

[0060] The length of the rod extrusion guide section 602 is greater than or equal to the sum of the lengths of the first guide sleeve 1 and the second guide sleeve 2; the number of cutting edges of the rod extrusion cutting section 601 is greater than or equal to the design value. Thus, the structure of the rod extrusion 6 is optimized, the number of cutting edges is increased, the size difference of adjacent edges is reduced, and the size and coaxiality of the hole after extrusion are guaranteed.

[0061] The present application also proposes a method for pressing a steering knuckle assembly bushing, which comprises the following steps:

[0062] Step 100, providing a single bushing extrusion device;

[0063] Step 101, installing the first guide sleeve 1 connected with the second guide sleeve 2 on the fixture base 3;

[0064] Step 102, placing the steering knuckle without the bushing squeezed on the fixture base 3, so that the second guide sleeve 2 is inserted into the main pin hole of the upper ear of the steering knuckle, and the top of the second guide sleeve abuts against the top of the bushing;

[0065] Step 103, align the extrusion rod 6 of the extrusion assembly with the second guide sleeve 2, and then move it vertically to the designed position to complete the extrusion expansion of the bushing.

[0066] Furthermore, when the length of the second guide sleeve 2 is shorter, in step 102 , it is necessary to ensure that the bottom surface of the upper ear of the steering knuckle is in contact with the plane of the fixture base 3 .

[0067] When the length of the second guide sleeve 2 is long, a pad 4 is added to the second guide sleeve 2 to optimize the pressure during extrusion and ensure the size and coaxiality of the hole after extrusion.

[0068] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art,

[0069] This application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of this application should be included in the scope of the claims of this application.

[0070] 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.

[0071] 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.

[0072] 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 extrusion tool, characterized in that: It includes: A first guide sleeve (1) has a second guide sleeve (2) coaxially arranged on its top end surface; the outer diameter of the second guide sleeve (2) is smaller than the outer diameter of the first guide sleeve (1), and the outer diameter of the second guide sleeve (2) is equal to the diameter of the main pin hole of the upper ear of the steering knuckle; the top end surface of the second guide sleeve (2) is a bushing abutment surface; the inner diameters of the first guide sleeve (1) and the second guide sleeve (2) are slightly larger than the diameter of the rod extrusion guide section (602); The first guide sleeve (1) is installed on the top surface of the fixture base (3) through the guide sleeve installation hole.

2. The single bushing extrusion tooling according to claim 1, characterized in that: The number of the first guide sleeves (1) is multiple and they are selectively installed on the fixture base (3); the number of the second guide sleeves (2) is equal to the number of the first guide sleeves (1), and the outer diameter of each second guide sleeve (2) is different.

3. The single bushing extrusion tooling according to claim 1, characterized in that: The top surface of the clamp base (3) and the top surface of the first guide sleeve (1) are located on the same horizontal plane, and are used to fit with the bottom surface of the upper ear of the steering knuckle; The single bushing extrusion tooling also includes a backing plate (4), on which a through hole having an outer diameter equal to that of the second guide sleeve (2) is provided; the backing plate (4) is sleeved on the second guide sleeve (2) through the through hole and is located on the top surface of the fixture base (3); The thickness of the backing plate (4) is smaller than the length of the second guide sleeve (2).

4. The single bushing extrusion tooling according to claim 3, characterized in that: The outer ring of the guide sleeve mounting hole is provided with a limiting step connected thereto; the first guide sleeve (1) is provided with a positioning ring which is flush with and concentric with the top thereof; the positioning ring is located in the limiting step.

5. The single bushing extrusion tooling according to claim 4, characterized in that: The projection of the pad (4) on the top surface of the fixture base (3) covers the top end surfaces of the first guide sleeve (1) and the positioning ring.

6. The single bushing extrusion tooling according to claim 1, characterized in that: The clamp base (3) comprises two horizontal parts and a vertical part; the two ends of the vertical part are respectively connected to a horizontal part to form a accommodating space for the lower ear of the steering knuckle.

7. The single bushing extrusion tooling according to claim 6, characterized in that: A reinforcing rib (5) is provided at the connection between the vertical portion and the horizontal portion.

8. A single bushing extrusion device, characterized in that: It includes: The single bushing extrusion tooling as described in any one of claims 1 to 7; The extrusion assembly comprises an extrusion rod (6), wherein the extrusion rod (6) comprises an extrusion rod installation section (600), an extrusion rod cutting section (601) and an extrusion rod guide section (602) which are connected in sequence from top to bottom; the diameters of the extrusion rod installation section (600) and the extrusion rod guide section (602) are equal to the inner diameter of the bushing.

9. The single bushing extrusion device according to claim 8, characterized in that: The length of the rod extrusion guide section (602) is greater than or equal to the sum of the lengths of the first guide sleeve (1) and the second guide sleeve (2); the number of cutting edges of the rod extrusion cutting section (601) is greater than or equal to the designed value.

10. A method for pressing a bushing of a steering knuckle assembly, characterized in that: Providing a single bushing extrusion device as described in any one of claims 8-9; Mounting the first guide sleeve (1) connected to the second guide sleeve (2) on the fixture base (3); The steering knuckle without the bushing pressed is placed on the fixture base (3), so that the second guide sleeve (2) is inserted into the main pin hole of the upper ear of the steering knuckle, and the top thereof abuts against the top of the bushing; The extrusion rod (6) of the extrusion assembly is aligned with the second guide sleeve (2), and then vertically moved to the designed position to complete the extrusion expansion of the bushing.

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