CN211102551U - Operation tool for precisely installing hole inner bushing - Google Patents

Abstract

The utility model discloses an downthehole bush precision installation is used as industry frock, the operation frock includes action bars and location base, the location base have can go on the part body the location face of fixing a position and can under the positioned state with the guiding hole that the bush mounting hole axial on the part body corresponds, the action bars stretches into with axial displaceable structure in the guiding hole of location base, just the action bars is in be connected with in the guiding hole can the axial displaceable and the pressure head of propelling movement bush. The utility model discloses fix a position, support with the bush of butt joint on the positioning base to the part body to can correspond the bush in the guide hole of positioning base carrying out axial displacement's action bars and pressure head and realize positive axial propelling movement, prevent that the bush from producing the slope when getting into the bush mounting hole, also can not cause the damage to the part body and bush, easy operation can make the bush light, high-efficient, high-quality accurate install in the corresponding bush mounting hole on the part body.

Description

A work tool for precise installation of a bushing in a hole

technical field

The utility model relates to a working tool for assembling parts, in particular to a working tool for precise installation of a bushing in a hole, which is particularly suitable for bushing installation in a shaft fitting hole on an aero-engine casing.

Background technique

In the installation structure of the shaft, in order to reduce the wear caused by the motion friction between the shaft and/or the seat, the shaft is usually assembled in the mounting hole on the seat with a bushing with lower hardness and better wear resistance ( For the convenience of description, such holes are collectively referred to as "bushing mounting holes" hereinafter), the bushing is fitted in the bushing mounting hole on the seat body with interference fit, and the bushing and the shaft piece are fitted with clearance. When a certain degree of wear occurs between the shaft member and the seat body during long-term motion friction, the replacement of the bushing can save the cost of replacing the shaft member and/or the seat body. It can be seen that the bushing is an important accessory for sealing and wear protection in moving parts.

There are many complex gear train structures in aero-engines, which are one of the typical moving parts. As mentioned above, the shaft member of the wheel train structure in the aero-engine is usually installed with a bushing in the corresponding bushing mounting hole on the casing. For example, the shaft member of the idler in the aero-engine is on the casing. Install it with a bushing in the idler shaft mounting hole of .

During the long-term operation of the aero-engine, the bushings assembled in the bushing mounting holes corresponding to the gear train structure on the casing will fail due to wear, which requires the corresponding bushing mounting holes on the casing. The original bushing is removed, and the new bushing is installed in the bushing mounting hole. It even involves the operation of reaming the corresponding bushing mounting hole on the receiver. Installation of bushings.

Based on the high precision of aero-engines, operations such as assembling the bushings in the bushing mounting holes corresponding to the gear train structure on the casing are all high-precision operations, and the bushings are installed in the corresponding bushing mounting holes on the casing. The following two technical conditions need to be met at the same time:

1. The bushing installed in the corresponding bushing mounting hole on the casing needs to be perpendicular to the surface formed by the bushing mounting hole on the casing, that is, the bushing needs to maintain a precise axial direction in the corresponding bushing mounting hole state;

2. The end face of the bushing installed in the corresponding bushing mounting hole on the casing shall not be higher than the surface formed by the bushing mounting hole on the casing, that is, the bushing shall be flush or inward (usually flush way) into the corresponding bushing mounting hole.

The above two installation technical conditions directly affect the precision, stability and reliability of the installation of the shaft corresponding to the gear train structure on the casing and the subsequent movement.

At present, the installation of the bushing in the corresponding bushing mounting hole on the aero-engine casing is mainly performed by the traditional operation method of hammer knocking due to the lack of effective special work tooling. The specific operation process is: first The bushing is docked at the corresponding bushing mounting hole on the casing; then a stepped punch rod is used to press against the outer end face of the bushing; then the tail end of the punch rod is hit with a hammer to push the bushing onto the casing in the corresponding bushing mounting holes.

It can be clearly seen from the above installation operation process that the installation thrust of the bushing in the corresponding bushing installation hole comes from the knocking of the hammer on the ram, and the knocking force is determined by the operator's subjective behavior. If the bushing is too small, it will not be able to fit the bushing into the bushing mounting hole effectively, and it will protrude somewhat at the outer edge of the bushing mounting hole. If the knocking force is too large, it is easy to cause the punch to the casing formed by the bushing mounting hole. The surface is damaged, so the entire installation process is difficult to operate and difficult to control. What's more, during the installation of the bushing, the direction of the hammer is not necessarily positive axial, so that the thrust on the bushing is not necessarily all axial, and there is also a radial thrust, which The punch will damage the inner wall of the bushing, and the bushing will be inclined during the installation process, which not only fails to meet the requirements of installation technical conditions, but also damages the wall of the bushing mounting hole on the casing. , which will adversely affect the installation precision of the bushing.

Utility model content

The technical purpose of the present utility model is to provide a corresponding bushing that can make the bushing easy, efficient and high-quality precisely mounted on the part body in view of the particularity of the above-mentioned bushing precision installation and the technical deficiencies of the existing work tooling. Work tooling in the mounting hole.

The technical purpose of the present utility model is achieved through the following technical solutions: a working tool for precision installation of a bushing in a hole, the working tool includes an operating rod and a positioning base, and the positioning base has a function that can be mounted on the part body A positioning surface for positioning, and a guide hole that can axially correspond to the bushing mounting hole on the part body in a positioning state, and the operating rod extends into the guide hole of the positioning base with an axially displaceable structure Inside, and the operating rod is connected with a pressing head capable of being axially displaceable to push the bushing in the guide hole.

As one of the preferred solutions, the positioning base has a threaded sleeve portion located at the axial outer side of the guide hole, and the operating rod extends into the guide hole through the threaded sleeve portion in a threaded fitting structure. Further, the guide hole of the positioning base is provided with a thrust conversion member between the operating rod and the pressing head. Still further, the thrust conversion member is an anti-friction washer or a thrust ball bearing. The operating rod has a handle part and a rod body part in the axial direction, the rod body part has a threaded structure connected with the positioning base, and the handle part is located outside the positioning base. Further, the operating rod also has a connecting neck and a limit portion located at the front end of the rod body in the axial direction, the connecting neck is used to fit the limit portion to sleeve the pressure head, and the limit portion It is connected with the pressure head in a threaded structure; the thread direction of the operation rod connecting the pressure head is opposite to the thread direction of the operation rod connecting the screw sleeve part; the axial direction of the pressure head is close to the thrust conversion member The threaded hole section on one side and the limit counterbore section on the side close to the pushing surface, the inner diameter of the limit counterbore section is larger than the inner diameter of the threaded hole section.

As one of the preferred solutions, the positioning base is mainly composed of a guide cylinder, a screw sleeve part and a base plate, the guide cylinder has a guide hole in the axial direction, and the screw sleeve part is located in a radially inwardly folded structure. One end of the guide cylinder, the base plate is located at the other end of the guide cylinder in a radially outward folded structure. Further, the base plate has at least one waist-shaped hole corresponding to the positioning hole on the part body. The guide cylinder and the screw sleeve part are of a separate combined structure. The guide cylinder and the base plate are integrally formed.

As one of the preferred solutions, the part body is a casing of an aero-engine. Further, the bushing mounting hole on the part body is an idler shaft mounting hole.

The beneficial technical effects of the present utility model are:

1. The utility model uses the positioning base to position and support the butt-jointed bushings on the part body, so that the corresponding bushings of the operating rod and the pressure head that can be axially displaced in the guide holes of the positioning base can achieve positive axial Push, prevent the bushing from tilting when entering the bushing installation hole, and will not cause damage to the part body and the bushing, easy to operate, and can make the bushing easy, efficient, and high-quality precision installation on the corresponding bushing on the part body inside the mounting hole;

2. The screw fitting structure between the operating rod and the positioning base of the present invention makes the axial displacement process of the operating rod in the guide hole of the positioning base stable and adjustable. The thrust is relatively balanced, which is conducive to the protection of the part body and the bushing;

3. The thrust conversion element between the operating rod and the indenter of the present invention can reliably convert the axial displacement thrust of the circumferential rotation of the operating rod into the axial displacement thrust of the linear motion of the indenter, so that when the bushing is pushed , reduce the relative circumferential friction movement between the pressure head and the bushing to protect the bushing;

4. The connection structure between the operating rod and the indenter of the present invention can not only effectively ensure the stability of the relative matching relationship between the two, but also has the characteristics of easy and easy assembly and disassembly of the two, and can also enable the two to achieve High-precision assembly will not affect the push installation of the bushing, nor will it cause damage to the bushing;

5. The forming structure of the positioning base of the present invention is conducive to stable and reliable installation and positioning on the part body, especially the waist-shaped hole structure on the base plate is conducive to flexibly adjust the installation position of the positioning base on the part body , so as to effectively ensure that the guide hole on the positioning base and the bushing mounting hole on the part body can be axially centered reliably; in addition, the split combination structure between the threaded sleeve part and the guide cylinder is conducive to lowering the positioning base The difficulty of the craftsmanship during processing.

Description of drawings

Fig. 1 is a kind of structure schematic diagram of the utility model.

FIG. 2 is an A-A view of FIG. 1 .

FIG. 3 is an external perspective view of the utility model.

FIG. 4 is a reference diagram of the use state of the present invention.

The meaning of the code in the figure: 1—operating lever; 11—handle part; 12—rod body part; 13—force transmission part; 14—connecting neck; 15—limiting part; 2—positioning base; 21—screw sleeve part; 22 - Guide cylinder; 23 - Base plate; 24 - Guide hole; 25 - Waist hole; 26 - Pin; 3 - Thrust conversion part; 4 - Press head; 41 - Threaded hole section; Part body; 51 - bushing mounting hole; 52 - positioning hole; 6 - positioning screw; 7 - bushing.

Detailed ways

The utility model relates to a working tool for parts assembly, in particular to a working tool for precise installation of a bushing in a hole. The following takes the bushing installation in the idler shaft mounting hole on the aero-engine casing as the object (that is, the following The part body is an aero-engine casing, and the bushing mounting hole is an idler shaft mounting hole on the aero-engine casing). The main technical content of the present utility model is described in detail through a number of embodiments, among which, Embodiment 1 is combined with the accompanying drawings in the description - That is, Figure 1, Figure 2, Figure 3 and Figure 4 clearly and intuitively describe the main technical content of the present utility model in detail. Although other embodiments have not drawn the corresponding drawings separately, their main technical solutions can still refer to the embodiments. 1 attached.

It should be noted here that the accompanying drawings of the present invention are schematic, and unnecessary details have been simplified for the purpose of clarifying the technical purpose of the present invention, so as to avoid obscuring the technology that the present invention contributes to the prior art Program.

Example 1

Referring to FIG. 1 , FIG. 2 , FIG. 3 and FIG. 4 , the present invention includes an operating rod 1 and a positioning base 2 .

The positioning base 2 is mainly composed of a guide cylinder 22 , a screw sleeve part 21 and a base plate 23 . The guide cylinder 22 is a cylindrical structure with a guide hole 24 with a through-hole structure in the axial direction. The guide hole 24 is an axial equal diameter structure. The inner diameter of the guide hole 24 should be at least equal to the bushing on the part body 5 The inner diameter (at the orifice) of the mounting hole 51 is generally slightly larger than the inner diameter of the bushing mounting hole 51 on the component body 5 . When the positioning base 2 is properly positioned on the part body 5 (ie, in the positioning state), the guide hole 24 of the guide cylinder 22 can axially correspond to the bushing mounting hole 51 on the part body 5 .

The screw sleeve portion 21 and the guide cylinder 22 are of a separate combined structure. Specifically, the outer contour of the screw sleeve portion 21 has a coaxial stepped structure with a large upper portion and a small lower portion. The inner diameter of the guide hole 24 of the guide cylinder 22 is the inner diameter; In order to ensure the reliability and stability of the connection between the screw sleeve portion 21 and the guide cylinder 22, a plurality of sets of one-to-one corresponding pin holes are provided in the circumferential direction of the telescoping area between the guide cylinder 22 and the screw sleeve portion 21. A pin 26 is inserted into the group of pin holes, and a plurality of pins 26 lock the guide cylinder 22 and the threaded sleeve part 21 in both the circumferential direction and the axial direction; usually, there is an interference between each pin 26 and the guide cylinder 22 Assembly, and the screw sleeve part 21 is a gap assembly. In addition, the threaded hole of the threaded sleeve portion 21 has a through-hole structure in the axial direction, and the threaded hole is used for inserting the operating rod 1. The threaded hole of the threaded sleeve portion 21 and the guide hole 4 of the guide cylinder 22 are substantially coaxial. layout.

The base plate 23 and the guide cylinder 22 are integrally formed. The base plate 23 is formed at the lower end of the guide cylinder 22 in a radially outward folding structure. The base plate 23 and the guide cylinder 22 form an inverted T-shaped structure. The existence of the base plate 23 should not affect the The guide hole 24 on the guide cylinder 22. There are two waist-shaped holes 25 on the base plate 23 radially extending out of the guide cylinder 22, and the orientation of the two waist-shaped holes 25 is the same. The shaped holes 25 should be able to correspond to the positioning holes 52 on both sides of the bushing mounting holes 51 on the part body 5 , that is, the two waist-shaped holes 25 on the base plate 23 should be able to be able to match the positioning holes 52 on the part body 5 . correspond. In addition, when the positioning base 2 of the above structure is in contact with the component body 5, the positioning base 2 uses the bottom surface of the base plate 23 as the joint surface, so the bottom surface of the base plate 23 is used as the positioning base 2. 5 , which also requires that the contour line of the bottom surface of the base plate 23 match the molding surface where the bushing mounting holes 51 on the part body 5 are located.

The operating rod 1 has a handle part 11 , a rod body part 12 , a force transmission part 13 , a connecting neck 14 and a limiting part 15 in sequence in the axial direction.

The rod body 12 has a threaded structure for connecting the threaded sleeve portion 21 on the positioning base 2, that is, the threaded structure on the rod head 12 matches the threaded structure on the threaded sleeve portion 21, and the rod body 12 passes through the threaded sleeve with a threaded structure. The portion 21 axially extends into the guide hole 24 of the positioning base 2 .

The handle portion 11 is located at the upper end of the rod body portion 12 . When the rod body portion 12 axially extends into the guide hole 24 of the positioning base 2 , the handle portion 11 is located outside the positioning base 2 . The outer periphery of the handle portion 11 is provided with a hand-kneaded friction-increasing structure, such as a mesh knurled structure.

The force transmission portion 13 is located below the threaded structure on the rod body portion 12 , and is formed in a radial plane structure, that is, the rod body at the force transmission portion 13 has a coaxial stepped structure.

The connecting neck 14 is located below the force transmission portion 13 , and the connecting neck 14 is an axial polished rod structure. The inner diameter of the end face of the force transmission portion 13 is substantially equal to the outer diameter of the connection neck 14 , and the outer diameter of the end face of the force transmission portion 13 is larger than the outer diameter of the connection neck 14 .

The limiting portion 15 is located below the connecting neck 14 , and the outer diameter of the limiting portion 15 is slightly larger than the outer diameter of the connecting neck 14 . The limiting portion 15 is provided with a threaded structure, and the helical direction of the threaded structure is opposite to the helical direction of the threaded structure on the rod body 12. If the threaded structure on the rod body 12 is set to be a right-handed thread, the thread on the limiting portion 15 The structure is left-hand thread.

The operating rod 1 of the above structure extends into the guide hole 24 of the positioning base 2 of the above structure through the screw structure that can be screwed in the circumferential direction with an axially displaceable structure, and the operating rod 1 basically maintains the coaxial center with the positioning base 2. In cooperation, the operating rod 1 is connected with the thrust converting member 3 and the pressing head 4 in the guide hole 24 .

The thrust conversion member 3 is an annular anti-friction washer of bronze structure, which is sleeved at the connecting neck 14 of the operating rod 1 and forms clearance fit with the inside of the guide hole 24 of the positioning base 2 . The upper surface of the thrust conversion member 3 forms a surface contact fit with the force transmission portion 13 on the operating rod 1 . The lower surface of the thrust conversion member 3 is in surface contact with the top surface of the press head 4 . The function of the thrust conversion member 3 is to convert the circumferential rotational motion of the operating rod 1 into the linear displacement motion of the indenter 4 .

The indenter 4 is a cylindrical structure matching the guide hole 24 on the positioning base 2 , and the indenter 4 and the guide hole 24 maintain clearance fit. The outer diameter of the indenter 4 should be at least equal to the outer diameter of the bushing 7 to be installed. Normally, the outer diameter of the indenter 4 is slightly larger than the outer diameter of the bushing 7 to be installed. The bottom end face of the indenter 4 is used as the surface of the pushing bush 7, and it needs to form a flat contact with the bush 7. Therefore, the bottom end face of the indenter 4 is a plane structure. The inside of the indenter 4 has a through hole structure in the axial direction, the through hole structure is used for connecting the operating rod 1 , and the inner diameter of the through hole structure must be smaller than the inner diameter of the bushing 7 to be installed. Specifically, the inner axial direction of the indenter 4 has a threaded hole section 41 on the side close to the thrust conversion member 3 and a limit counterbore section 42 on the side close to the pushing surface (ie, the bottom end face). The threaded hole on the indenter 4 The segment 41 has a threaded structure that fits with the limiting portion 15 on the operating rod 1. The depth of the threaded hole segment 41 is generally less than the length of the connecting neck 14 on the operating rod 1; the inner diameter of the counterbore segment 42 is larger than the threaded hole. The inner diameter of the segment 41 is also larger than the outer diameter of the limiting portion 15 on the operating rod 1 . The pressing head 4 of the aforementioned structure is connected to the limiting portion 15 and/or the connecting neck 14 of the above-mentioned operating rod 1 through the threaded hole section 41 and/or the limiting counterbore section 42 in the inner axial direction.

Referring to Fig. 4, the operation process of installing the bushing 7 in the bushing mounting hole 51 on the part body 5 using the present invention is roughly as follows:

- Axially butt the bushing 7 at the orifice of the bushing mounting hole 51 on the part body 5;

- Align the guide hole 24 of the positioning base 2 with the bushing 7 on the part body 5 and the bushing mounting hole 51 axially, so that the guide hole 24 fits the bushing 7, and ensure that the positioning surface on the positioning base 2 and The forming surfaces of the bushing mounting holes 51 on the part body 5 form surface contact; on this basis, the positioning base 2 is adjusted with the positioning holes 52 on the part body 5 as the target, so that the waist-shaped holes 25 on the base plate 23 are adjusted. Corresponding to the positioning holes 52 on the part body 5, the positioning screws 6 are installed in the corresponding waist-shaped holes 25 and the positioning holes 52, thereby positioning the positioning base 2 on the part body 5;

- Rotate the operating rod 1 in a direction that can displace the operating rod 1 downward (eg clockwise), the circumferential rotational thrust of the operating rod 1 acts on the indenter 4 through the thrust conversion member 3, and the indenter 4 is in the guide hole 24 The linear displacement goes down and comes into contact with the upper end face of the bushing 7. Continuing this operation, the indenter 4 pushes the bushing 7 axially, so that the bushing 7 is all pushed and pressed into the bushing installation hole 51 on the part body 5. The head 4 acts on the surface of the part body 5, and the surface is installed in place when it cannot go down. At this time, the end face of the bushing 7 and the end face of the bushing installation hole 51 form a smooth fit.

During the above installation process, a floating connection is formed between the front end of the operating rod 1 and the indenter 4; as for the upward linear displacement of the indenter 4 in the guide hole 24, the indenter 4 can be aligned by rotating the operating rod 1 in the opposite direction. Due to the opposite helical directions of the two threaded structures on the operating rod 1, the reverse rotation of the operating rod 1 will not cause the limiting portion 15 to be screwed into the threaded hole section 41 of the pressing head 4, so that the pressure can be reliably driven. The straight line in the axial direction of the head 4 moves upward.

Example 2

The other contents of this embodiment are the same as those of Embodiment 1, except that the thrust conversion member is a thrust ball bearing.

Example 3

The other contents of this embodiment are the same as those of Embodiment 1, except that the screw sleeve portion of the positioning base and the guide cylinder are integrally formed.

Example 4

The other contents of this embodiment are the same as those of Embodiment 1, except that the base plate of the positioning base and the guide cylinder are of a separate combined structure.

The above embodiments are only used to illustrate the present invention, but not to limit it. Although the present utility model has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific technical solutions of the above-mentioned embodiments, or to perform equivalent replacements to some of the technical features; and These modifications or substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides an in-hole bush precision mounting is as industry frock which characterized in that: the operation frock includes action bars (1) and location base (2), location base (2) have can be on the part body (5) go on the location face of location and can with guiding hole (24) that bush mounting hole (51) axial on the part body (5) correspond under the positioned state, action bars (1) stretch into with axial displaceable structure in guiding hole (24) of location base (2), just action bars (1) are in be connected with in guiding hole (24) can axial displaceable and push away pressure head (4) of bush (7).

2. An industrial tool for precisely installing an inner bushing in a hole according to claim 1, wherein: the positioning base (2) is provided with a screw sleeve part (21) which is positioned at the axial outer side of the guide hole (24), and the operating rod (1) extends into the guide hole (24) through the screw sleeve part (21) in a thread matching structure.

3. An industrial tool for precisely installing an inner bushing in a hole according to claim 2, wherein: a thrust conversion piece (3) positioned between the operating rod (1) and the pressure head (4) is arranged in a guide hole (24) of the positioning base (2).

4. An industrial tool for precisely installing an inner bushing in a hole according to claim 2 or 3, wherein: the axial of action bars (1) has handle portion (11) and body portion (12), have on the body portion (12) and connect the screw thread structure of location base (2), handle portion (11) are in the outside of location base (2).

5. An industrial tool for precisely installing an inner bushing in a hole according to claim 4, wherein: the axial direction of the operating rod (1) is also provided with a connecting neck (14) and a limiting part (15) which are positioned at the front end of the rod body part (12), the connecting neck (14) is used for matching with the limiting part (15) to sleeve the pressure head (4), and the limiting part (15) is matched and connected with the pressure head (4) in a threaded structure; the direction of the thread of the operating rod (1) connected with the pressure head (4) is opposite to the direction of the thread of the operating rod (1) connected with the screw sleeve part (21); the axial direction of the pressure head (4) is provided with a threaded hole section (41) close to one side of the thrust conversion piece (3) and a limiting counter bore section (42) close to one side of the pushing surface, and the inner diameter of the limiting counter bore section (42) is larger than that of the threaded hole section (41).

6. An industrial tool for precisely installing an inner bushing in a hole according to claim 3, wherein: the thrust conversion piece (3) is an antifriction washer or a thrust ball bearing.

7. An industrial tool for precisely installing an inner bushing in a hole according to claim 1 or 2, wherein: the positioning base (2) mainly comprises a guide cylinder (22), a threaded sleeve part (21) and a base plate (23), wherein a guide hole (24) is formed in the axial direction of the guide cylinder (22), the threaded sleeve part (21) is located at one end of the guide cylinder (22) in a radial inward folding structure, and the base plate (23) is located at the other end of the guide cylinder (22) in a radial outward folding structure.

8. An industrial tool for precisely installing an inner bushing in a hole according to claim 7, wherein: the base plate (23) is provided with at least one waist-shaped hole (25) which can correspond to the positioning hole (52) on the part body (5).

9. An industrial tool for precisely installing an inner bushing in a hole according to claim 7, wherein: the guide cylinder (22) and the screw sleeve part (21) are of a split combined structure.

10. An industrial tool for precisely installing an inner bushing in a hole according to claim 1, wherein: the part body (5) is a casing of an aircraft engine.

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