WO2013056417A1

WO2013056417A1 - Dowel pin with adjustable diameter

Info

Publication number: WO2013056417A1
Application number: PCT/CN2011/080914
Authority: WO
Inventors: 罗海斌; 许辉; 候伟; 徐仁建
Original assignee: 中联重科股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2013-04-25

Abstract

A dowel pin with the adjustable diameter comprises a pin body (2), a shaft sleeve (4), at least two sleeve barrels (6) and an elastic ring (8). The pin body (2) comprises a nut (24) and a main shaft (22) that are integrally formed. The main shaft (22) comprises an external thread portion (220) and an urging portion. External threads are provided on the external thread portion (220). The shaft sleeve (4) is sleeved on the external thread portion (220) of the main shaft (22) of the pin body, and is provided with a penetrating sleeve hole (42) therein. Internal threads fitting the external threads of the external thread portion (220) are provided inside the sleeve hole (42). At least two fixture blocks (44) are arranged on the shaft sleeve (4). The at least two sleeve barrels (6) are clamped around the pin body (2) and the shaft sleeve (4). Each sleeve barrel (6) has a bayonet (622) fitting each fixture block (44) of the shaft sleeve (4). A shaft sleeve accommodating portion (62) and an urging surface are arranged in each sleeve barrel (6). The dowel pin with the adjustable diameter facilitates assembly and disassembly. Besides, each specification of the dowel pin with an adjustable diameter satisfies the requirement for tight-fit connection of all part pin holes within a certain diameter range.

Description

Adjustable diameter locating pin

Technical field

This invention relates to a connecting fastener, and more particularly to an adjustable diameter locating pin. Background technique

At present, locating pins are widely used in various fields of mechanical manufacturing as a common connecting fastener.

Typically, locating pins are used to connect two or more perforated parts for "centering" and "positioning". The locating pin is usually fixed in the hole by a small amount of interference, so the size, shape, surface roughness and the like of the part pin hole are required to be high, and the diameter of the locating pin is required to be slightly larger than the diameter of the part pin hole, and a certain tool is used during installation. Knock the locating pin into the part pin hole. However, in some cases, the locating pin needs to be disassembled frequently, which constitutes a contradiction. Because the locating pin and the part pin hole are closely matched, the disassembly process is very laborious, and when the part is located in a compact space, or positioning If rust is unique between the pin and the part, it is extremely difficult to remove the locating pin.

In addition, the locating pins need to be mated with the part pin holes, which necessitates the use of locating pins of different diameters for parts with pin holes of different diameters. If the site does not happen to have a locating pin of a suitable diameter, the tooling operation cannot be completed, thus greatly reducing the production efficiency.

At present, there has been an adjustable diameter locating pin in the industry, which includes a locating pin body and a spacer. The inner diameter of the spacer and the outer diameter of the locating pin body are identical, and the two have a small clearance fit, and the spacer is fastened by the limiting device. Locating the pin body. The solution adapts the locating pin body to different component pin hole diameter requirements by securing spacers having different diameters to the locating pin body. However, it can be seen that in order to meet the different pin hole diameter requirements of different parts, it is necessary to prepare a variety of different diameter blocks, which cannot completely solve the above adaptation problem, and after the spacer is installed, the positioning pin and the parts are still very disassembled. It is laborious, so it does not solve the problem of disassembly and assembly. Summary of the invention In view of the above problems, an object of the present invention is to provide a locating pin of adjustable diameter to completely solve the problem of inconvenient disassembly and assembly of the locating pin and poor versatility.

An adjustable diameter locating pin of the present invention includes a pin body, the adjustable diameter locating pin further comprising a sleeve, at least two sleeve bodies, and an elastic annular body, the pin body comprising an integrally formed a nut and a main shaft, the main shaft includes an external thread portion and an abutting top, and the external thread portion is provided with an external thread, and the sleeve is sleeved on the external thread portion of the pin body main shaft, and the through shaft is provided therein a sleeve hole, wherein the sleeve hole is provided with an internal thread that cooperates with an external thread of the external thread portion, and at least two blocks are disposed on the sleeve, and at least two sleeve bodies are disposed at the sleeve Around the pin body and the sleeve, each of the sleeve bodies has a bayonet that cooperates with each of the blocks of the sleeve, and each sleeve body is provided with a sleeve receiving portion and a top surface, the pin The top of the body spindle can top the top surface of each of the sleeve bodies, and the elastic annular body is sleeved around the outer circumference of the at least two sleeves. In one embodiment of the invention, the top end of the pin body of the pin is tapered, and the top surface of each of the sleeve bodies is tapered.

In one embodiment of the invention, the taper of the top of the pin body of the pin body and the taper of the top surface of each of the sleeve bodies are the same.

In one embodiment of the invention, the aforementioned block of the bushing extends outwardly perpendicular to the axis of the sleeve.

In one embodiment of the invention, the number of the blocks of the aforementioned bushing is the same as the number of the sleeve bodies.

In one embodiment of the invention, each of the aforementioned sleeve bodies are identical in shape and may collectively enclose a cylindrical sleeve.

In one embodiment of the invention, the nut of the pin body is a polygonal cylinder or a hexagonal groove at its end, a circular hole of a vertical axis, a m-shaped groove, a cross groove or a slot. In one embodiment of the invention, the aforementioned elastic annular body is a spring file.

In an embodiment of the present invention, an annular positioning groove is further formed on an outer circumferential surface of the sleeve body, and the elastic annular body is locked in the positioning groove.

In an embodiment of the present invention, the spindle of the pin body further includes a connecting portion, an end shaft portion, and a second top portion. Accordingly, the sleeve body further includes a neck portion and an end shaft receiving portion. And second Abutting against the top surface, the second abutting top of the pin body main shaft can abut the second abutting surface of each of the sleeve bodies, and the radius of the neck portion of the sleeve body is larger than the radius of the connecting portion of the pin body main shaft However, it is smaller than the radius of the external thread portion and the end shaft portion of the pin main shaft.

The invention has the beneficial effects that the use of the adjustable diameter positioning pin completely reverses the structure of the existing positioning pin and the disassembly and assembly method, and has an adjustable diameter range, which is convenient for installation or disassembly, and is Due to its adjustable diameter, the same type of adjustable diameter locating pin can be used for part pin holes in a certain diameter range. That is, each type of adjustable diameter locating pin can meet all parts within a certain diameter range. The tight fitting connection of the pin holes allows the size of the adjustable diameter locating pins to be standardized, thereby significantly increasing production efficiency.

The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be more clearly understood. The following specific embodiments are described in detail below with reference to the accompanying drawings. BRIEF abstract

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a preferred embodiment of an adjustable diameter locating pin of the present invention.

2 is a perspective view of the pin body of the preferred embodiment of the adjustable diameter locating pin of the present invention. 3 is a perspective view of a bushing of a preferred embodiment of the adjustable diameter locating pin of the present invention. Figure 4 is a perspective view of a sleeve body of a preferred embodiment of the adjustable diameter locating pin of the present invention.

Figure 5 is a view of the state of use of a preferred embodiment of the adjustable diameter locating pin of the present invention. Figure 6 is a perspective view of a second embodiment of the adjustable diameter locating pin of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The specific embodiments, structures, characteristics and effects of the adjustable diameter positioning pin according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments as follows:

The foregoing and other technical contents, features, and effects of the present invention are incorporated in the following reference drawings. The detailed description of the preferred embodiment will be apparent. The description of the embodiments is to be understood as illustrative and not restrictive

Referring to Figure 1, the adjustable diameter locating pin of the embodiment of the present invention comprises a pin body 2, a bushing 4, two sleeve bodies 6 and an elastic annular body 8.

Referring to Figures 1 and 2, the pin body 2 includes a main shaft 22 and a nut 24 disposed at the end of the main shaft 22. The nut 24 is a cylinder having a regular hexagonal cross section. The main shaft 22 is a stepped cylinder having a slightly larger diameter at both ends and a smaller intermediate diameter, and each of which is perpendicular to the axis. The upper portion is provided with an external thread portion 220, a first top portion 222, and a connection. Portion 224, end shaft portion 226, and second top portion 228. The externally threaded portion 220 is adjacent to the nut 24, and the externally threaded portion 220 has the largest diameter on the main shaft 22 and is provided with an external thread on its outer circumference. The first abutting top portion 222 is disposed adjacent to the externally threaded portion 220, and its diameter is gradually reduced, that is, the first top portion 222 is surrounded by a tapered surface having a trapezoidal shape through the axis. The connecting portion 224 is disposed adjacent to the top portion 222 of the fourth portion and has the smallest diameter. The end shaft portion 226 is disposed adjacent to the connecting portion 224 and has a diameter smaller than the inner diameter of the outer thread portion 220 but larger than the outer diameter of the connecting portion 224. A second top portion 228 is provided at the end of the end shaft portion 226, the diameter of which is also gradually reduced, i.e., the second top portion 228 is also surrounded by a tapered surface having a trapezoidal cross section through the axis. The external thread portion 220 of the main shaft 22, the first abutting top portion 222, the connecting portion 224, the end shaft portion 226, and the second abutting top portion 228 and the nut 24 are coaxially disposed and integrally formed.

Referring to FIG. 1 and FIG. 3, the sleeve 4 is substantially an annular cylinder, and a through hole 42 is formed therein, and an external thread of the external thread portion 220 of the pin body 2 is disposed in the sleeve hole 42. Fit the internal thread. Two blocks 44 are symmetrically disposed at both ends of the sleeve 4, and the blocks 44 extend perpendicularly to the axis of the sleeve 4.

Referring to FIG. 1 and FIG. 4, the sleeve body 6 is substantially a semi-cylindrical body, and the two sleeve bodies 6 have the same shape and can be collectively surrounded by a cylindrical sleeve (see FIG. 5), the pin body 2 and the sleeve. The sleeve 4 on the pin body 2 is received in a cylindrical sleeve which is enclosed by the two sleeve bodies 6. The outer peripheral surface of the cylindrical sleeve which is formed by the two sleeve bodies 6 is the contact surface of the adjustable diameter positioning pin of the embodiment of the invention and the pin hole of the component to be fastened. The sleeve body 6 is provided with an accommodating space 60 extending through the axis of the semi-cylindrical body, and a sleeve receiving portion 62 and a first four-top portion are disposed in the accommodating space 60. Face 64, neck 65, end shaft receiving portion 66, and second top surface 68. Bushing The accommodating portion 62 is substantially a semi-cylindrical cavity, and the two sleeve accommodating portions 62 of the two sleeve bodies 6 can accommodate the sleeve 4 together, and are further disposed on the wall surface surrounding the sleeve accommodating portion 62. The bayonet 622 of the block 44 of the sleeve 4 can be received and engaged. The end shaft receiving portion 66 is substantially a semi-cylindrical cavity, and the two end shaft receiving portions 66 of the two sleeve bodies 6 can collectively receive the end shaft portion 226 of the main shaft 22 of the pin body 2. The first top surface 64 is disposed adjacent to the sleeve receiving portion 62, which is a half rounded surface with a gradually decreasing radius. In the present embodiment, the first abutting surface 64 and the main shaft 22 of the pin body 2 The first abutting top 222 has the same degree of pushing. The neck portion 65 is disposed between the first abutting surface 64 and the end shaft receiving portion 66, and is the portion having the smallest radius in the accommodating space 60 of the sleeve body 6. The second abutting surface 68 is disposed at the end of the end shaft receiving portion 66 in the sleeve body 6, which is also a half rounded surface with a gradually decreasing radius. In the present embodiment, the second dome surface 68 and the pin The second abutting top 228 of the main body 22 of the body 2 has the same degree of pushing. Referring to FIG. 5 together, a boss 61 is protruded from an end of the sleeve body 6 on the outer peripheral surface of the sleeve body 6 so as to be close to the inner sleeve receiving portion 62. The boss 61 has a polygonal cross section. In this embodiment, the cross section of the boss 61 has two straight sides parallel to each other, and the sides connecting the two straight sides are curved. Thus, the cross-sectional shape formed by the two bosses 61 of the two sleeve bodies 6 is substantially rounded. Two annular positioning grooves 69 are further defined on the outer circumferential surface of the sleeve body 6. The positioning grooves 69 are disposed substantially perpendicular to the axis of the sleeve body 6 for receiving the elastic annular body 8 and for the elastic annular body. 8 positioning.

The elastic annular body 8 is a spring file, which may be a rubber band or a rubber crucible having elasticity or the like.

The assembly process of the adjustable diameter locating pin of the embodiment of the present invention is detailed below.

Referring to FIG. 1, at the time of assembly, first, the end shaft portion 226 of the main shaft 22 of the pin body 2 is inserted into the sleeve hole 42 of the sleeve 4 until the external thread portion 220 of the main shaft 22 of the pin body 2 touches the sleeve 4 The internal thread in the hole 42 rotates the main shaft 22 of the pin body 2 relative to the sleeve 4, and the external thread portion 220 of the main shaft 22 is screwed into the sleeve hole 42 of the sleeve 4 until the sleeve 4 is completely seated on the main shaft 22 On the external thread portion 220. Then, the pin body 2 sleeved with the sleeve 4 is sandwiched between the two sleeve bodies 6, so that the sleeve 4 is housed in the two sleeve housing portions 62 of the two sleeve bodies 6, and The block 44 of the sleeve 4 is inserted into the bayonet 622 of the sleeve body 6 in the sleeve receiving portion 62, and the end shaft portion 226 of the main shaft 22 of the pin body 2 is accommodated in the two end shafts of the two sleeve bodies 6. The inside of the accommodating portion 66. Finally, the two elastic annular bodies 8 are respectively sleeved outside the two sleeve bodies 6, and are clamped into the positioning grooves 69 outside the sleeve body 6. Thus, the adjustable diameter locating pin of the embodiment of the present invention is installed. Thus, the block 44 of the sleeve 4 is defined in the bayonet 622 of the sleeve body 6 such that the sleeve body 6 is not axially axial with respect to the sleeve 4 Move, but can be close to or away from the main shaft 22 of the pin body 2. At this time, the first 4 氐 top 222 of the main body 22 of the pin body 2 corresponds to the position of the first 4 top surface 64 in the sleeve body 6, but does not contact each other; the second abutting top 228 and the sleeve of the main body 22 of the pin body 2 The second abutting faces 68 in the cylinder 6 are also in positional correspondence, but are not in contact with each other. As in the state shown in Fig. 1, the lower casing is referred to as an initial state. In this state, the adjustable diameter positioning pin of the embodiment of the present invention is in the state of the smallest diameter, but the elastic annular body 8 is already in a stretched state so that the elements of the adjustable diameter positioning pin are not scattered.

In the present embodiment, the radius of the neck portion 65 in the sleeve body 6 is larger than the radius of the connecting portion 224 of the main shaft 22 of the pin body 2, but smaller than the radius of the external thread portion 220 and the end shaft portion 226 of the main shaft 22 of the pin body 2, so After the mounting, even if the external thread portion 220 of the main shaft 22 of the pin body 2 and the threaded sleeve 4 are loosely fitted, the pin body 2 does not fall out from between the sleeve bodies 6.

The adjustable diameter positioning pin of the embodiment of the invention is adapted to connect the pin hole aperture to be slightly larger than the initial state of the positioning pin, that is, the first 4 top 222 of the main shaft 22 of the pin body 2 and the first 4 top surface of the sleeve body 6. The 64 positions correspond to each other but do not contact each other; the second 4th top 228 of the main body 22 of the pin body 2 and the second abutting surface 68 of the sleeve body 6 are also parts of a diameter corresponding to each other but not in contact with each other. For example, an adjustable diameter locating pin of an embodiment of the present invention has a diameter of 39 mm in the initial state, and the locating pin is adapted to connect a part having a pin hole diameter of 40 to 45 mm.

When the user needs to use the adjustable diameter locating pin connection part of the embodiment of the present invention, the pin holes (not shown) of the parts to be joined are first aligned, and then the adjustable diameter locating pin of the embodiment of the present invention is inserted. In the corresponding pin hole, for example, the adjustable diameter positioning pin has a diameter of 39 mm in the initial state, and the pin hole of the part to be joined has a hole diameter of 42 mm, and the positioning pin can be easily inserted into the pin hole. Then, the user selects two wrenches in the general mechanical tool kit, and clamps the two bosses 61 of the two sleeve bodies 6 with a wrench, since the two bosses 61 of the two sleeve bodies 6 have two cross sections. Straight edges that are parallel to each other, so they can be easily caught. Then, the nut 24 of the pin body 2 is rotated clockwise by another wrench, so that the pin body 2 continues to be screwed into the sleeve 4 which is inserted into the two sleeve bodies 6, and then moved into the two sleeve bodies 6. Space 60. When the first 4 氐 top 222 of the main shaft 22 of the pin body 2 begins to contact the first 4 top surface 64 in the sleeve body 6, the second 4 top 228 of the main shaft 22 of the pin body 2 begins to contact the inside of the sleeve body 6. The second abutting surface 68 continues the above operation to continue the movement of the pin body 2, and the first 4th top portion 222 of the main shaft 22 of the pin body 2 pushes the first 4th top surface 64 of the 4 sleeve body 6, and the pin The second abutting top 228 of the main shaft 22 of the body 2 is urged against the second abutting surface 68 in the sleeve body 6. Thereby resisting The elastic force of the elastic annular body 8 causes the two sleeve bodies 6 to be pushed outward in the axial direction, and the maximum diameter of the outer circumference of the two sleeve bodies 6 is increased. When the diameter is increased to be larger than the aperture of 42 mm, the locating pin forms an interference fit with the pin hole, that is, a tight fit. At this time, the user can determine whether to continue the above operation according to the connection requirement of the part, so that the cooperation between the positioning pin and the pin hole is more tight. If the user thinks that the predetermined matching requirement has been reached between the positioning pin and the pin hole, the above operation can be stopped, and the two wrenches are removed, and the positioning pin is installed.

Since the thread has a self-locking function, the pin body 2 is held in this position relative to the two sleeve bodies 6 after the user no longer applies force to the pin body 2. The locating pin is firmly fixed in the pin hole of the part.

When the user needs to remove the positioning pin mounted on the pin hole of the part, it is also necessary to use two wrenches, clamp the two bosses 61 of the two sleeve bodies 6 with one wrench, and rotate counterclockwise with the other wrench. The nut 24 of the pin body 2 rotates the pin body 2 relative to the sleeve 4 that is inserted into the two sleeve bodies 6, and the accommodating space 60 in the two sleeve bodies 6 is relatively slightly removed. The first top portion 222 of the main shaft 22 of the pin body 2 is retracted by the abutting state of the first abutting surface 64 in the sleeve body 6, and the second abutting top portion 228 of the main shaft 22 of the pin body 2 is also supported by the sleeve body. The pushing state of the second abutting surface 68 in 6 is retracted. At this time, under the elastic force of the elastic annular body 8, the two sleeve bodies 6 move toward each other, so that the maximum diameter of the outer circumferences of the two sleeve bodies 6 is reduced. When the diameter is reduced to less than 42 mm, the locating pin can be easily removed from the pin hole. Of course, it is also possible to continue the above operation on the positioning pin until the first 4 氐 top 222 of the main shaft 22 of the pin body 2 leaves the first 4 氐 top surface 64 in the sleeve body 6, and the second 4 氐 of the main shaft 22 of the pin body 2 The top portion 228 exits the second top surface 68 of the sleeve body 6, and the locating pin returns to the initial state.

Referring to FIG. 6, in the second embodiment of the adjustable diameter positioning pin of the present invention, the other components are the same as in the first embodiment, except that the positioning pin includes four sleeves of the same shape. The body 6, the sleeve body 6, is substantially a cylinder having a quarter-circle cross section, that is, four sleeve bodies 6, which can collectively enclose a cylindrical sleeve. Each sleeve body 6 is provided with a bayonet 622, and correspondingly, the sleeve 4 has four blocks 44. The assembly and use process are the same as those in the first embodiment, and will not be described again.

Thus, the adjustable diameter locating pin of the present invention completely reverses the structure of the existing locating pin and the detaching method, and has an adjustable diameter range, which is convenient for installation or disassembly, and is adjustable due to its diameter, Parts pin holes in a certain diameter range, can use the same model Adjusting the diameter of the positioning pin, that is, the adjustable diameter of each type of positioning pin can meet the requirements of the tight fitting connection of all the part pin holes in a certain diameter range, so the size of the adjustable diameter positioning pin can be standardized. This can significantly increase production efficiency.

It can be understood that in other embodiments of the adjustable diameter locating pin of the present invention, the locating pin can also include three sleeve bodies 6 of the same shape, each sleeve body 6 being substantially a column having a one-third circle. The body, that is to say the three sleeve bodies 6, can together enclose a cylindrical sleeve. It will also be appreciated that the locating pin may also include more than two other numbers of sleeve bodies 6, each sleeve body 6 preferably having the same shape and having an equally symmetrical cylindrical cross section. The adjustable diameter locating pin of the present invention is not limited to use with a circular pin hole, but may also cooperate with other shaped pin holes, such as elliptical, square or other polygonal shapes. In the case that the pin holes are square or other polygonal shapes, it is only necessary to form the outer shape of at least two sleeve bodies 6 of the adjustable diameter positioning pins of the present invention into a square shape or other polygonal shape, and the technical effect of the present invention can also be achieved. .

It can also be understood that the main shaft 22 of the pin body 2 may not be provided with the connecting portion 224, the end shaft portion 226, and the second abutting portion 228, and only includes the external thread portion 220 and the abutting top portion 222; correspondingly, the sleeve body 6 The accommodating space 60 may not include the neck portion 65, the end shaft accommodating portion 66, and the second top surface 68, and only includes the sleeve accommodating portion 62 and the fourth top surface 64. That is, only the top portion 222 of the main shaft 22 of the pin body 2 and the dome surface 64 of the sleeve body 6 housing space 60 may be engaged. The size of the locating pin depends on the size of the locating pin in the initial state, the thrust of the spindle 22 of the pin body 2 against the top 222 and its projected length on the axis of the spindle 22. These factors can be changed and adjusted as needed. Further, the abutting surface 64 in the housing space 6 of the sleeve body 6 is preferably the same as the pressing force of the abutting top portion 222 of the main shaft 22 of the pin body 2, but this is not a requirement. Even the four top faces 64 of the sleeve body 6 accommodating space 60 and the four top faces 222 of the main body 22 of the pin body 2 may not be mating tapered faces and push bodies, for example, the sleeve body 6 accommodates the space 60. The abutting surface 64 is a tapered surface, and the abutting top portion 222 of the main shaft 22 of the pin body 2 is a drum portion that bulges on the main shaft 22; or conversely, the abutting surface 64 in the housing space 6 of the sleeve body 6 is bulged. The drum top surface, and the top portion 222 of the main shaft 22 of the pin body 2 is a tapered surface; or the top surface 64 of the sleeve body 6 accommodating space 60 and the abutting top portion 222 of the main shaft 22 of the pin body 2 are drum-shaped, both of which are The technical effect of the adjustable diameter positioning pin of the present invention can be achieved. That is, as long as the top 4 of the main shaft 22 of the pin body 2 is 222, the top surface of each of the sleeve bodies 6 can be 4 64, and the elastic annular body 8 is placed on the outer circumference of the sleeve body 6, so that the technical effect of the adjustable diameter positioning pin of the present invention can be achieved.

Similarly, the number of the elastic annular bodies 8 may not be two, but one or more. The elastic annular body 8 may also be a rubber sleeve having a certain width, for example, the width of which is the same as the length of the sleeve body 6, i.e., the elastic annular body 8 is placed outside the sleeve body 6 and surrounded. Thus, when the aligning pin of the adjustable diameter of the present invention is located in the pin hole of the component and is in an interference fit state, the force of the entire locating pin can be improved. Of course, the elastic annular body 8 may also be a metal crucible having a strong elasticity or a metal snap spring having an opening. The nut 24 of the pin body 2 may not be a hexagonal cylinder, but other polygonal cylinders, or a circular cylinder, and a hexagonal groove, a circular hole of a vertical axis, a m-shaped groove, Cross slot or slotted slot.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Without departing from the spirit and scope of the invention, the invention may be modified or modified as equivalents without departing from the scope of the invention. Within the scope of the technical solution.

Industrial applicability

In the adjustable diameter locating pin of the present invention, the structure of the existing locating pin and the disassembly method are completely reversed, and the adjustable diameter range is convenient, whether it is installation or disassembly, and is adjustable due to its diameter. For the pin hole of the part within a certain diameter range, the same type of adjustable diameter locating pin can be used, that is, the adjustable diameter locating pin of each specification can meet the tight fit of all parts of the pin hole in a certain diameter range. The requirement of the connection makes it possible to standardize the size of the adjustable diameter locating pin, which can significantly increase the production efficiency.

Claims

Claim

An adjustable diameter locating pin, comprising a pin body, wherein the adjustable diameter locating pin further comprises a sleeve, at least two sleeve bodies, and an elastic annular body, the pin body comprising An integrally formed nut and a main shaft, the main shaft including an external thread portion and an abutting top, wherein the external thread portion is provided with an external thread, and the sleeve is sleeved on the external thread portion of the pin body main shaft, a through hole is provided, and an internal thread is formed in the sleeve hole to cooperate with an external thread of the external thread portion, and at least two blocks are disposed on the sleeve, at least two sleeve body clips Provided around the pin body and the sleeve, each of the sleeve bodies has a bayonet that cooperates with each of the blocks of the sleeve, and each sleeve body is provided with a sleeve receiving portion and a top surface. The top of the pin body of the pin body may top the top surface of each of the sleeve bodies, and the elastic annular body is sleeved around the outer circumference of the at least two sleeves.

2. The adjustable diameter positioning pin according to claim 1, wherein: the abutting top of the pin body main shaft is tapered, and the abutting surface of each of the sleeve bodies is a tapered surface.

3. The adjustable diameter locating pin according to claim 2, wherein: the taper of the pin body to the top of the pin and the taper of the abutting top surface of each of the sleeve bodies are the same.

4. The adjustable diameter locating pin of claim 1 wherein: the retaining block of the bushing extends outwardly perpendicular to the axis of the bushing.

5. The adjustable diameter positioning pin according to claim 1, wherein: the number of the blocks of the sleeve is the same as the number of the sleeve bodies.

6. The adjustable diameter locating pin of claim 1 wherein: each of the sleeves is identical in shape and can collectively enclose a cylindrical sleeve.

7. The adjustable diameter positioning pin according to claim 1, wherein: the nut of the pin body is a polygonal cylinder, or a hexagonal W groove, a circular hole of a vertical axis is provided at an end thereof, M-shaped slot, cross slot or slotted.

8. The adjustable diameter locating pin of claim 1 wherein: said resilient annular body is a spring file.

9. The adjustable diameter positioning pin according to claim 1, wherein: an annular positioning groove is further disposed on an outer circumferential surface of each of the sleeve bodies, and the elastic annular body is clamped in the Positioning

10. The adjustable diameter positioning pin according to claim 1, wherein: the main shaft of the pin body further comprises a connecting portion, an end shaft portion, and a second top portion, and correspondingly, the sleeve body further The neck, the end shaft receiving portion, and the second abutting surface, the second abutting top of the pin body main shaft can abut the second top surface of each of the sleeve bodies, the sleeve body neck The radius is larger than the radius of the connecting portion of the pin main shaft, but smaller than the radius of the external thread portion and the end shaft portion of the pin main shaft.