CN218556962U - Press fitting auxiliary tool, press head and press-in device - Google Patents

Abstract

The application discloses pressure equipment appurtenance, pressure head and push in device. The opening bush has first state and second state, and opening bush is greater than its second external diameter at the second state at the first external diameter of first state, and pressure equipment appurtenance includes: a body including a first surface and a second surface oppositely disposed in a first direction; the pilot hole, the pilot hole extends and communicates first surface and second surface along the first direction, the internal wall face of pilot hole has transition portion, transition portion has first opening and the second opening of relative setting on the first direction, the internal diameter of first opening is more than or equal to first external diameter, the internal diameter of second opening is less than first external diameter and is more than or equal to the second external diameter, along first opening to second open-ended direction, the internal diameter of transition portion reduces gradually. The utility model provides a pressure equipment appurtenance can improve the convenience of pressing the pressure equipment hole of target part with the opening bush in.

Description

Press fitting auxiliary tool, press head and press-in device

Technical Field

The application belongs to the technical field of mechanical assembly, especially relates to a pressure equipment appurtenance, pressure head and push in device.

Background

The lining is a ring sleeve which is used for playing a role of a liner between mechanical parts, the lining can reduce abrasion, vibration and noise generated between the mechanical parts when in application, the lining also has an anti-corrosion effect, and the use of the lining can also facilitate the maintenance of machinery and simplify the structure and the manufacturing process of the machinery.

The variety of bush is more, and the opening bush be one of them, because the external diameter of opening bush when not closing up will be than the internal diameter in the pressure equipment hole of target spare more greatly for the opening bush is difficult to be impressed the pressure equipment hole of target spare, and when the opening bush was impressed the pressure equipment hole of target spare, the extrusion of opening bush and target spare made the opening bush to be crushed easily, even made the target spare crushed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a pressure equipment appurtenance, pressure head and push in device, aims at improving the convenience in the pressure equipment hole of impressing the opening bush target spare.

In a first aspect, an embodiment of the present application provides a press-fitting auxiliary tool for pressing an opening bushing into a press-fitting hole, the opening bushing having a first state and a second state, a first outer diameter of the opening bushing in the first state being greater than a second outer diameter thereof in the second state, the press-fitting auxiliary tool including: a body including a first surface and a second surface oppositely disposed in a first direction; the pilot hole, the pilot hole extends and communicates first surface and second surface along the first direction, the internal wall face of pilot hole has transition portion, transition portion has first opening and the second opening of relative setting on the first direction, the internal diameter of first opening is more than or equal to first external diameter, the internal diameter of second opening is less than first external diameter and is more than or equal to the second external diameter, along first opening to second open-ended direction, the internal diameter of transition portion reduces gradually.

According to an embodiment of the first aspect of the present application, the first opening is located on a side of the second opening facing the first surface, the guiding hole further has a first inner diameter portion disposed on a side of the first opening close to the first surface, the first inner diameter portion is formed by extending along the first direction, and an inner diameter of the first inner diameter portion is equal to an inner diameter of the first opening.

According to any one of the embodiments of the first aspect of the present application, a guide portion is connected between the first inner diameter portion and the first surface, and an inner diameter of the guide portion gradually increases in a direction away from the first inner diameter portion.

According to any one of the embodiments of the first aspect of the present application, the second opening is located on a side of the first opening facing the second surface, the guiding hole further has a second inner diameter portion disposed on a side of the transition portion close to the second surface, the second inner diameter portion is formed to extend along the first direction, and an inner diameter of the second inner diameter portion is equal to an inner diameter of the second opening.

According to any of the preceding embodiments of the first aspect of the present application, the extension of the first inner diameter portion in the axial direction thereof is greater than or equal to one half of the axial extension of the split bush.

In accordance with any of the preceding embodiments of the first aspect of the present application, the body has an annular boss for insertion into the press-fitting hole and mating with the chamfered inner surface of the press-fitting hole, the annular boss projecting from the second surface.

According to any of the preceding embodiments of the first aspect of the application, the transition portion further has an inclined inner wall connecting the first opening and the second opening, the inclined inner wall having a predetermined angle of inclination with the first surface, the predetermined angle of inclination being between 75 ° and 85 °.

In a second aspect, embodiments of the present application provide a press-fitting aid for pressing an open bushing into a press-fitting hole and any of the previously described embodiments of the first aspect, the press-fitting aid comprising: and the pressing part is used for pressing the opening bushing into the press-fitting auxiliary tool and the press-fitting hole.

According to the second aspect of the present application, the opening bushing further includes a support portion extending from the press-in portion along the first direction, the support portion protrudes from the press-in portion, an outer diameter of the support portion is equal to an inner diameter of the through hole of the opening bushing, and the support portion is configured to extend into the through hole to support the opening bushing.

According to any of the foregoing embodiments of the second aspect of the present application, the split bushing includes a body and a protrusion disposed on the body in the first direction, the press-in portion further includes a relief portion disposed around at least a portion of the support portion, a space surrounded by the relief portion is used for accommodating the protrusion, and an inner diameter of the relief portion is greater than or equal to a maximum diameter of the protrusion.

According to any one of the foregoing embodiments of the second aspect of the present application, the indenter further includes a stopper portion provided on a side of the press-in portion away from the support portion, an outer diameter of the stopper portion being larger than a maximum inner diameter of the guide hole; the extending dimension of the press-in portion in the first direction is equal to or greater than the distance between the first surface and the second surface in the first direction.

In a third aspect, the present embodiment provides a press-fitting device, including the press-fitting auxiliary tool in any one of the foregoing first aspect embodiments and the press head in any one of the foregoing second aspect embodiments.

The utility model provides a pressure equipment appurtenance for impress the opening bush pressure equipment hole, pressure equipment appurtenance includes main part and guiding hole, and the guiding hole extends and communicates the first surface and the second surface of main part along the first direction, and the opening bush can pass the main part through the guiding hole and be impressed in the pressure equipment hole of target spare. The internal wall face of guiding hole has transition portion, and transition portion has relative first opening and the second opening that sets up in the first direction, and along first opening to the direction of second opening, the internal diameter of transition portion reduces gradually, and consequently, transition portion has the guide effect. When the opening bushing is pressed into the guide hole of the press-fitting auxiliary tool and is pressed to the second opening of the transition part from the first opening of the transition part, the opening bushing can be gradually pressed to be contracted, so that the opening bushing can be pre-contracted in the guide hole of the press-fitting auxiliary tool, namely, the opening bushing can be changed from the first state with a larger outer diameter to the second state with a smaller outer diameter, the opening bushing can be easily pressed into the press-fitting hole of the target part, the convenience of pressing the opening bushing into the press-fitting hole is improved, and the possibility of crushing the opening bushing and the target part is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a ram, split bushing in a first state, press-fit auxiliary tool, and a target part in relative position according to some embodiments of the present application;

FIG. 2 is a cross-sectional view of the indenter, the split bushing in a first state, a press-fitting aid, and a target part according to some embodiments of the present application;

FIG. 3 is a cross-sectional view of the indenter, split bushing, press-fit assist tool and target member in a second state according to some embodiments of the present application;

FIG. 4 is a cross-sectional view of a press-fitting aid of some embodiments of the present application in connection with a target part;

figure 5 is a cross-sectional schematic view of a ram and split bushing according to some embodiments of the present application.

Description of the reference numerals:

1-press fitting auxiliary tools;

11-a body; 111-a first surface; 112-a second surface; 113-an annular boss;

12-a pilot hole; 121-a first inner diameter portion; 122-a second inner diameter portion; 123-a transition portion; 123 a-a first opening; 123 b-a second opening; 123 c-an inclined inner wall; 124-a guide part;

2-a pressure head;

21-a press-in part; 211-a bit-letting part;

22-a support;

23-a limiting part;

3-an open bushing;

31-an outer wall; 311-abdication openings;

32-a through hole;

33-protrusions;

4-target part;

41-press mounting holes; 411-chamfering;

x-a first direction.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The lining is a ring sleeve which is used between mechanical parts and plays a role of a liner, when the lining is applied, the lining can reduce abrasion, vibration and noise generated between the mechanical parts, has an anti-corrosion effect, and can facilitate the maintenance of machinery and simplify the structure and the manufacturing process of the machinery. The applicant researches and discovers that the outer diameter of the opening bushing when the opening bushing is not closed up is much larger than the inner diameter of a press mounting hole of a target part, and a transition structure for extruding the opening bushing to reduce the opening bushing cannot be arranged in the press mounting hole, so that the opening bushing is not easy to be pressed into the press mounting hole of the target part, and the opening bushing is easily pressed to be damaged if the opening bushing is forcibly pressed into the target part, and even the target part is damaged.

The present application is provided to solve the above technical problems. For a better understanding of the present application, the press-fitting auxiliary tool 1, the press ram 2, and the press-fitting device according to the embodiments of the present application will be described in detail below with reference to the drawings.

Fig. 1 is a schematic diagram showing relative positions of a ram 2, an opening bush 3 and a press-fitting auxiliary tool 1 in a first state and a target member 4 according to some embodiments of the present application, fig. 2 is a schematic diagram showing a cross-sectional connection of the ram 2, the opening bush 3 and the press-fitting auxiliary tool 1 in the first state and the target member 4 according to some embodiments of the present application, and fig. 3 is a schematic diagram showing a cross-sectional connection of the ram 2, the opening bush 3 and the press-fitting auxiliary tool 1 in a second state and the target member 4 according to some embodiments of the present application, wherein an X direction is a first direction X.

As shown in fig. 1 to 3, an embodiment of the present application provides a press-fitting auxiliary tool 1 for pressing an opening bush 3 into a press-fitting hole 41, the opening bush 3 having a first state and a second state, a first outer diameter of the opening bush 3 in the first state being larger than a second outer diameter thereof in the second state, the press-fitting auxiliary tool 1 including: the guide hole 12 extends along the first direction X and communicates the first surface 111 and the second surface 112, an inner wall surface of the guide hole 12 is provided with a transition portion 123, the transition portion 123 is provided with a first opening 123a and a second opening 123b which are oppositely arranged along the first direction X, an inner diameter of the first opening 123a is larger than or equal to a first outer diameter, an inner diameter of the second opening 123b is smaller than the first outer diameter and larger than or equal to a second outer diameter, and an inner diameter of the transition portion 123 gradually decreases along a direction from the first opening 123a to the second opening 123 b.

According to the press-fitting auxiliary tool 1 provided by the embodiment of the application, the opening bush 3 is pressed into the press-fitting hole 41, the press-fitting auxiliary tool 1 comprises the main body 11 and the guide hole 12, the guide hole 12 extends along the first direction X and is communicated with the first surface 111 and the second surface 112 of the main body 11, and the opening bush 3 can penetrate through the main body 11 through the guide hole 12 and is pressed into the press-fitting hole 41 of the target member 4. The inner wall surface of the guide hole 12 has a transition portion 123, the transition portion 123 has a first opening 123a and a second opening 123b which are oppositely arranged in the first direction X, and the inner diameter of the transition portion 123 is gradually reduced along the direction from the first opening 123a to the second opening 123b, so that the transition portion 123 has a guiding function. When the split bush 3 is pressed into the guide hole 12 of the press-fitting auxiliary tool 1 and is pressed from the first opening 123a of the transition portion 123 toward the second opening 123b of the transition portion 123, the split bush 3 can be gradually pressed to be constricted, so that the split bush 3 can be pre-contracted in the guide hole 12 of the press-fitting auxiliary tool 1, that is, the split bush 3 can be shifted from a first state having a larger first outer diameter to a second state having a smaller second outer diameter, so that the split bush 3 can be easily pressed into the press-fitting hole 41 of the object 4, the convenience of pressing the split bush 3 into the press-fitting hole 41 is improved, and the possibility of crushing the split bush 3 and the object 4 is reduced.

Optionally, referring to fig. 2 and 3, the transition portion 123 further has an inclined inner wall 123c connecting the first opening 123a and the second opening 123b, and a preset inclination angle is formed between the inclined inner wall 123c and the first surface 111, in some embodiments, the preset inclination angle may be 75 ° to 85 °, and the inclined inner wall 123c having a larger preset inclination angle makes the extrusion deformation of the opening bush 3 generated when the opening bush is pressed into the transition portion 123 of the guide hole 12 smaller in variation range, so as to reduce the stress in the deformation process of the opening bush 3, and improve the problem of extrusion damage to the opening bush 3 caused by the larger variation range of the extrusion deformation of the opening bush 3 generated when the opening bush 3 is pressed into the transition portion 123 of the guide hole 12 when the preset inclination angle is smaller.

In the present embodiment, the opening bush 3 has the outer wall 31, the outer wall 31 of the opening bush 3 has the relief opening 311, the relief opening 311 can be compressed and reduced and can be restored without being compressed, so that the outer diameter of the opening bush 3 can be changed, when the opening bush 3 is not pressed into the press-fitting auxiliary tool 1 or the press-fitting hole 41 of the target member 4, as shown in fig. 2, the opening bush 3 is in the first state and has the first outer diameter, and when the opening bush 3 is gradually pressed into the press-fitting auxiliary tool 1, the outer wall 31 of the opening bush 3 is compressed by the transition portion 123 in the guide hole 12, so that the relief opening 311 is gradually compressed and reduced, so that the opening bush 3 is changed from the first state to the second state, and the outer diameter of the opening bush 3 is gradually reduced.

In some embodiments, as shown in fig. 3, after the split bush 3 is passed through the press-fitting auxiliary tool 1 and pressed into the press-fitting hole 41 of the target member 4, the outer wall 31 of the split bush 3 is fitted to the inner wall of the press-fitting hole 41, and the split bush 3 is in the second state and has the second outer diameter.

Alternatively, as shown in fig. 2 and 3, the first outer diameter of the split bush 3 is the outer diameter of the outer wall 31 when the split bush 3 is in the first state, that is, the first outer diameter is the outer diameter of the outer wall 31 when the split bush 3 is not pressed; the second outer diameter of the split bush 3 is the outer diameter of the outer wall 31 when the split bush 3 is in the second state, that is, the second outer diameter is the outer diameter of the outer wall 31 when the split bush 3 is pressed, and the second outer diameter is the same as the inner diameter of the press-fitting hole 41.

In some embodiments, with continued reference to fig. 2 and fig. 3, the first opening 123a is located on a side of the second opening 123b facing the first surface 111, the guide hole 12 further has a first inner diameter portion 121 disposed on a side of the first opening 123a close to the first surface 111, the first inner diameter portion 121 extends along the first direction X, and an inner diameter of the first inner diameter portion 121 is equal to an inner diameter of the first opening 123a, so that the first inner diameter portion 121 can limit an axis of the opening bush 3 from rotating in the first direction X, so that the opening bush 3 can be more easily pressed into the transition portion 123 along the first direction X.

Alternatively, the extension of the first inner diameter portion 121 in the first direction X may be greater than or equal to one-half of the axial extension of the split bush 3. The first inner diameter portion 121 has a sufficient extension size in the first direction X, the opening bushing 3 with a larger size enters the transition portion after extending into the first inner diameter portion 121 and is compressed, the first inner diameter portion can provide a limit for the opening bushing 3, the problem of inclination of the axis of the opening bushing deviating from the first direction X is solved, and the opening bushing 3 is more easily pressed into the transition portion 123 in the first direction X.

As shown in fig. 2 and 3, in some embodiments, a guide portion 124 is connected between the first inner diameter portion 121 and the first surface 111, and an inner diameter of the guide portion 124 is gradually increased in a direction away from the first inner diameter portion 121. When the split bush 3 and the press-fitting auxiliary tool 1 are aligned, the split bush 3 is relatively easily slid into the first inner diameter portion 121 through the guide portion 124, and the alignment efficiency between the split bush 3 and the press-fitting auxiliary tool 1 is improved.

Alternatively, the inner diameter of the guide portion 124 on the side close to the first inner diameter portion 121 may be equal to the inner diameter of the first inner diameter portion 121, so as to further improve the alignment efficiency between the opening bush 3 and the pressing auxiliary tool 1.

In some embodiments, as shown in fig. 2 and 3, the second opening 123b is located on a side of the first opening 123a facing the second surface 112, the guiding hole 12 may further have a second inner diameter portion 122 disposed on a side of the transition portion 123 close to the second surface 112, the second inner diameter portion 122 extends along the first direction X, and an inner diameter of the second inner diameter portion 122 is equal to an inner diameter of the second opening 123 b. When the split bush 3 is pressed into the second inner diameter portion 122 through the transition portion 123, since the inner diameter of the second opening 123b is smaller than the first outer diameter, the inner diameter of the second inner diameter portion 122 is smaller than the first outer diameter, so that the split bush 3 is held in a state of being pressed and reduced in the second inner diameter portion 122, that is, the portion of the split bush 3 located in the second inner diameter portion 122 has already been pre-shrunk, and the split bush 3 after passing through the second inner diameter portion 122 can more easily enter the press-fitting hole 41 of the target member 4.

Alternatively, the inner diameter of the second inner diameter portion 122 may be equal to the second outer diameter, that is, the inner diameter of the second inner diameter portion 122 may be equal to the inner diameter of the press-fitting hole 41 of the target member 4, so that the split bush 3 can be more easily entered into the press-fitting hole 41 of the target member 4.

The present application does not limit the extension of the second inner diameter portion 122 in the first direction X, and when the extension of the second inner diameter portion 122 in the first direction X is larger, the more the portion of the opening bush 3 that can be located in the second inner diameter portion 122, that is, the more the portion of the opening bush 3 that can be in the pre-contracted state, the more stably the opening bush 3 can pass through the second inner diameter portion 122 and enter the press-fitting hole 41 of the target member 4.

Alternatively, the extension of the second inner diameter portion 122 in the first direction X may be equal to the axial extension of the split bush 3.

Fig. 4 is a schematic cross-sectional view of the press-fitting auxiliary tool 1 and the target member 4 according to some embodiments of the present application, and referring to fig. 2 to 4, in some embodiments, the main body 11 may have an annular protrusion 113 for being inserted into the press-fitting hole 41 and fitting with an inner surface of a chamfer 411 of the press-fitting hole 41, the annular protrusion 113 protrudes from the second surface 112, so that the annular protrusion 113 can be fitted with the chamfer 411 of the press-fitting hole 41, and the chamfer 411 of the press-fitting hole 41 can provide a limit for the annular protrusion 113, so that the split bush 3 can be easily pressed into the press-fitting hole 41 of the target member 4.

In some embodiments, the annular protruding portion 113 is concentric with the guiding hole 12, that is, after the annular protruding portion 113 is matched with the chamfer 411 of the press-fitting hole 41, the guiding hole 12 and the press-fitting hole 41 of the target part 4 also complete alignment, so that alignment efficiency between the press-fitting auxiliary tool 1 and the target part 4 can be improved.

Figure 5 is a cross-sectional view of a ram and split bushing according to some embodiments of the present application.

According to some embodiments of the present application, referring to fig. 2, 3 and 5, the present application further provides a press head 2, the press head 2 being used for pressing the split bush 3 into the press-fitting auxiliary tool 1 and the press-fitting hole 41 in any of the foregoing embodiments, the press head 2 including a pressing portion 21, an outer diameter of the pressing portion 21 being smaller than or equal to a second outer diameter, the pressing portion 21 being used for pressing the split bush 3 into the press-fitting auxiliary tool 1 and the press-fitting hole 41.

Since the outer diameter of the press-fitting portion 21 is smaller than the second outer diameter, the press-fitting portion 21 can enter into the guide hole 12 and further press-fit the split bush 3 located in the guide hole 12 into the press-fitting hole 41 of the target member 4.

In some embodiments, the indenter 2 may further include a support portion 22 extending from the pressing portion 21 along the first direction X, the support portion 22 is disposed to protrude from the pressing portion 21, an outer diameter of the support portion 22 is equal to an inner diameter of the through hole 32 of the split bush 3, and the support portion 22 is configured to extend into the through hole 32 to support the split bush 3. Since the outer diameter of the support portion 22 is equal to the inner diameter of the through hole 32 of the split bush 3, so that the support portion 22 can restrict the rotation of the axis of the split bush 3 from deviating from the first direction X, the working stability of the indenter 2 pressing the split bush 3 into the guide hole 12 of the press-fitting auxiliary tool 1 or the press-fitting hole 41 of the target workpiece can be improved.

In some embodiments, referring to fig. 2, 3 and 5, the split bush 3 may include a body and a protrusion 33 disposed on the body in the first direction X, the pressing portion 21 may further include an avoiding portion 211 disposed around at least a portion of the support portion 22, a space surrounded by the avoiding portion 211 is used for accommodating the protrusion 33, and an inner diameter of the avoiding portion 211 is greater than or equal to a maximum diameter of the protrusion 33, so as to further limit rotation of the split bush 3 from the first direction X, and further improve working stability of the pressing head 2 pressing the split bush 3 into the guide hole 12 of the press-fitting auxiliary tool 1 or the press-fitting hole 41 of the target workpiece.

In some embodiments, the indenter 2 may further include a stopper portion 23 provided on a side of the press-in portion 21 away from the support portion 22, an outer diameter of the stopper portion 23 being larger than a maximum inner diameter of the guide hole 12; the extending dimension of the press-fitting portion 21 in the first direction X is equal to or greater than the distance between the first surface 111 and the second surface 112 in the first direction X. Because the outer diameter of the limiting portion 23 is larger than the maximum inner diameter of the guide hole 12, the limiting portion 23 cannot enter the guide hole 12, so that when the press-in portion 21 completely enters the guide hole 12, that is, the press-in portion 21 presses the opening bush 3 into the press-fitting hole 41 of the target part 4, the limiting portion 23 will be blocked outside the guide hole 12, that is, the press head 2 cannot move continuously toward the target part 4 along the first direction X, and it can be improved that the press head 2 presses the opening bush 3 out of the press-fitting hole 41 of the target part 4, or crushes the opening bush 3.

According to some embodiments of the present application, the present application also provides a press-fitting device, which includes the press-fitting auxiliary tool 1 in any one of the foregoing embodiments and the press head 2 in any one of the foregoing embodiments. The pressing device can press the opening bush 3 into the press fitting auxiliary tool 1 through the pressing head 2 so as to complete the pre-shrinkage of the opening bush 3, the outer diameter of the opening bush 3 which completes the pre-shrinkage is reduced, the opening bush 3 can be easily pressed into the press fitting hole 41 of the target part 4, the convenience of pressing the opening bush 3 into the press fitting hole 41 is improved, and the possibility of crushing the opening bush 3 and the target part 4 is reduced.

As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.

Claims (12)

1. A press-fitting assist tool for pressing an open bushing into a press-fitting hole, the open bushing having a first state and a second state, a first outside diameter of the open bushing in the first state being greater than a second outside diameter thereof in the second state, the press-fitting assist tool comprising:

a body including a first surface and a second surface oppositely disposed in a first direction;

the guide hole extends along the first direction and is communicated with the first surface and the second surface, the inner wall surface of the guide hole is provided with a transition part, the transition part is provided with a first opening and a second opening which are oppositely arranged in the first direction, the inner diameter of the first opening is larger than or equal to the first outer diameter, the inner diameter of the second opening is smaller than the first outer diameter and larger than or equal to the second outer diameter, and the inner diameter of the transition part is gradually reduced along the direction from the first opening to the second opening.

2. A press-fitting aid as claimed in claim 1, wherein said first opening is located on a side of said second opening facing said first surface, said guide hole further has a first inner diameter portion provided on a side of said first opening adjacent to said first surface, said first inner diameter portion is formed to extend in said first direction, and an inner diameter of said first inner diameter portion is equal to an inner diameter of said first opening.

3. A press-fitting auxiliary tool as set forth in claim 2, wherein a guide portion is connected between said first inner diameter portion and said first surface, and an inner diameter of said guide portion is gradually increased in a direction away from said first inner diameter portion.

4. A press-fitting auxiliary tool as set forth in claim 1, wherein said second opening is located on a side of said first opening facing said second surface, said guide hole further has a second inner diameter portion provided on a side of said transition portion adjacent to said second surface, said second inner diameter portion is formed to extend in said first direction, and an inner diameter of said second inner diameter portion is equal to an inner diameter of said second opening.

5. A press-fitting auxiliary tool as set forth in any one of claims 2 to 3, wherein said first inner diameter portion has an extension in said first direction which is greater than or equal to one-half of an axial extension of said split bush.

6. A press-fitting aid as claimed in any one of claims 1 to 4, wherein said body has an annular projection for insertion into said press-fitting hole and for mating with a chamfered inner surface of said press-fitting hole, said annular projection projecting from said second surface.

7. A press-fitting aid as claimed in any one of claims 1 to 4, wherein said transition portion further has an inclined inner wall connecting said first opening and said second opening, said inclined inner wall having a predetermined angle of inclination with said first surface, said predetermined angle of inclination being 75 ° to 85 °.

8. A press-fitting attachment tool as claimed in any one of claims 1 to 7, wherein the press-fitting attachment tool is adapted to press an open sleeve into a press-fitting hole, and the press-fitting attachment tool comprises: and the pressing part is used for pressing the opening bushing into the press-fitting auxiliary tool and the press-fitting hole.

9. The indenter of claim 8, further comprising a support extending from the press-in section in the first direction, the support being disposed proud of the press-in section, the support having an outer diameter equal to an inner diameter of the bore of the split bushing, the support being adapted to extend into the bore to support the split bushing.

10. A chuck according to claim 9, wherein said split sleeve includes a body and a projection disposed on said body in said first direction, said drive-in portion further includes a relief portion disposed around at least a portion of said support portion, said relief portion defining a space for receiving said projection, and said relief portion having an inner diameter that is greater than or equal to a maximum diameter of said projection.

11. A indenter as claimed in any of claims 9 to 10, further comprising a retaining portion provided on a side of the press-in portion remote from the support portion, the retaining portion having an outer diameter greater than the largest inner diameter of the guide hole;

the extending dimension of the press-fitting portion in the first direction is equal to or greater than the distance between the first surface and the second surface in the first direction.

12. A press-fitting device comprising the press-fitting auxiliary tool according to any one of claims 1 to 7 and the press-fitting head according to any one of claims 8 to 11.

Images