Metal rubber vibration isolator press fitting tool

Abstract

A metal rubber vibration isolator press fitting tool comprises a base, a barrel and a pressing plate which can be coaxially assembled, the base is used for bearing an outer sleeve of a metal rubber vibration isolator, a first limiting pin is connected to the base, and a first limiting hole matched with the first limiting pin is formed in the lower portion of the barrel; the bottom face of the pressing plate is connected with a second limiting pin, the edge of the pressing plate is connected with a first guide pin extending in the press-fitting direction, and a first guide hole matched with the first guide pin is formed in the upper portion of the barrel. After an outer sleeve and a barrel of the metal rubber vibration isolator are sequentially and coaxially assembled to the base, the first limiting pin is used for limiting rotation of the outer sleeve and the barrel, the pressing plate can always provide vertical downward pressure for an upper connecting plate of the metal rubber vibration isolator under the guiding effect of the first guiding pin, and the second limiting pin is used for limiting rotation of the upper connecting plate. According to the press-fitting tool, relative torsion among the upper connecting plate, the mandrel and the outer sleeve can be prevented in the whole press-fitting process, and the product yield is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of vibration isolator manufacturing, in particular to the field of manufacturing rubber springs and vibration isolators with metal rubber vulcanization, and specifically to a metal rubber vibration isolator press-fitting tool. Background Art

[0002] Metal rubber isolators are widely used in rail transit vehicle bogies and passenger car and commercial vehicle chassis components. Their main function is to store and release energy. They also play an important role in achieving connection, positioning, and alleviating vibration and impact caused by uneven routes. To a large extent, they guarantee the dynamic performance and running quality of the vehicle. Figure 1 As shown, it is composed of a core shaft 6, a sleeve 4 and an upper connecting plate 5. The vulcanized connecting rubber between the core shaft 6 and the sleeve 4 plays a role of vibration isolation and buffering. In the manufacturing and assembly process of such a metal rubber vibration isolator, the upper connecting plate 5 needs to be pressed onto the top of the core shaft 6, and the good quality of the metal rubber vibration isolator requires that the relative position of the mounting hole 1 41 of the sleeve 4 and the mounting hole 2 51 of the upper connecting plate 5 must be accurate, and there must be no over-limit deviation, otherwise the sleeve 4 and the upper connecting plate 5 will not be able to be installed and connected with the external connecting parts. Since there is an elastic rubber layer between the core shaft 6 and the sleeve 4, which is not a rigid connection, when the connecting plate 5 needs to be pressed onto the top of the core shaft 6, the core shaft 6 may rotate relative to the sleeve 4 due to external forces such as friction. At this time, after the upper connecting plate 5 is pressed, the elastic rubber layer recovers its deformation, causing the upper connecting plate 5 to twist after the pressing, resulting in the relative position deviation between the mounting hole 1 41 and the mounting hole 2 51, which ultimately leads to the failure of the finished metal rubber vibration isolator. In order to solve this technical problem, it is necessary to provide a special tool to prevent relative twisting between the upper connecting plate 5, the core shaft 6 and the outer sleeve 4 during the press-fitting process.

[0003] Through searching, some technical documents of shock absorber assembly devices are disclosed in the prior art. For example, the invention patent publication document with the publication number of "CN112518286A" and the name of "High-pressure spring type press-fit rubber shock absorber mold" is disclosed. A high-pressure spring type press-fit rubber shock absorber mold is disclosed, in which the pressure head is connected to the upper guide column by bolts; the lower guide column is connected to the first screw rod, and the middle part moves up and down on the outer circle of the upper guide column by filling the first spring; the guide sleeve is connected to the second screw rod, and the middle part moves up and down in the inner cavity of the upper guide column by filling the second spring; the guide mandrel is connected to the die pressing base by bolts, the guide mandrel fixes the wheel hub of the pressed workpiece, and the die pressing base fixes the pulley of the pressed workpiece; the rubber ring is fixed in the gap between the guide sleeve and the lower guide column, and the rubber ring is pushed out and squeezed into the gap between the wheel hub and the pulley by applying pressure.

[0004] For example, the invention patent publication document with the publication number "CN115816369A" and the name "Assembly Tool for Vibration Isolation Decoupler" discloses an assembly tool for vibration isolation decoupler, which is used to assemble the internal components of the vibration isolation decoupler into the pulley, including a support frame and a fixed support seat, and the pulley of the vibration isolation decoupler is placed on the support seat; the first end of the support frame is placed with the internal components of the vibration isolation decoupler, and the second end of the support frame is axially limited and installed in the support seat, and can move along the axis between a first position and a second position; when the support frame is in the first position, the internal components of the vibration isolation decoupler are assembled to the support frame outside the pulley; when the support frame is in the second position, the internal components of the vibration isolation decoupler are accommodated in the pulley as the support frame moves, and some components of the vibration isolation decoupler are assembled on the outside of the pulley. The above two comparative documents did not propose corresponding technical solutions for the technical problem of relative torsion between the upper connecting plate, the core shaft, and the outer sleeve during the press-fitting process. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a metal rubber vibration isolator pressing tool, comprising a base, a cylinder and a pressing plate that can be coaxially assembled, the base is used to support the outer sleeve of the metal rubber vibration isolator, a first limit pin is connected to the base, and a first limit hole matching the first limit pin is opened at the lower part of the cylinder; a second limit pin is connected to the bottom surface of the pressing plate, the edge of the pressing plate is connected to a first guide pin extending in the pressing direction, and a first guide hole matching the first guide pin is opened at the upper part of the cylinder; when the outer sleeve and the cylinder of the metal rubber vibration isolator are coaxially assembled to the base in sequence, the first limit pin is used to limit the rotation of the outer sleeve and the cylinder, and the pressing plate can always provide vertical downward pressure to the upper connecting plate of the metal rubber vibration isolator under the guiding action of the first guide pin, and the second limit pin is used to limit the rotation of the upper connecting plate.

[0006] Furthermore, the middle part of the lower surface of the pressure plate has a first spring pin extending along the pressing direction. During the pressing process, the end of the first spring pin is always in contact with the top mounting hole of the core shaft of the metal rubber vibration isolator, and there is a circumferential limit portion between the first spring pin and the mounting hole that contacts each other.

[0007] Furthermore, a limiting component is connected to the base, and after the cylinder is assembled to the base, the first limiting pin and the limiting component are used to limit the rotation of the outer sleeve and the cylinder.

[0008] Furthermore, the limiting component includes a third limiting pin connected to the upper surface of the base, and also includes a limiting groove opened in the lower part of the cylinder.

[0009] Furthermore, the first limiting pin includes a hollow connecting column connected to the base, a first spring is provided in the hollow connecting column, and the upper end of the first spring is connected to the column pin.

[0010] Furthermore, the first spring pin includes a blind hole opened in the center of the pressure plate, and a second spring is arranged in the blind hole. The upper end of the second spring is connected to a column pin 1, and the column pin 1 is square, waist-shaped or spline-shaped.

[0011] Furthermore, a top column is connected to the upper surface of the base, and during the press-fitting process, the top surface of the top column contacts the rubber at the bottom of the core shaft of the metal rubber vibration isolator.

[0012] Furthermore, the bottom of the top column has a concave arc surface, and the concave arc surface matches the rubber surface of the bottom of the core shaft.

[0013] Furthermore, the top of the cylinder has a top flange, and the bottom has a bottom flange, the first limiting hole and the limiting groove are both provided on the bottom flange, and the first guide hole is provided on the top flange.

[0014] Furthermore, the first limiting hole, the limiting groove, the first guide hole, the first limiting pin, the second limiting pin, and the first guide pin are all distributed in pairs diagonally.

[0015] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the press-fitting tool provided by the present invention prevents the outer sleeve and the cylinder from twisting by the mutual limitation of the first limit pin and the first limit hole, prevents the upper connecting plate from twisting by the mutual limitation of the second limit pin and the second mounting hole, and the press plate can always maintain vertical downward pressure during the press-fitting process through the interaction of the first guide pin and the first guide hole. The entire press-fitting process can prevent relative twisting between the upper connecting plate, the mandrel, and the outer sleeve, thereby ensuring product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : A typical schematic diagram of the structure of a metal rubber isolator; Figure 2 : Schematic diagram of the overall structure of the press tooling; Figure 3 : Schematic diagram of the split structure of the press-fitting tooling; Figure 4 : Schematic diagram of the bottom structure of the press-fitting tooling; Figure 5 :Schematic diagram of pressure plate structure Figure 1 ; Figure 6 :Schematic diagram of pressure plate structure Figure 2 ; Figure 7 : Figure 4 A-direction sectional view; Figure 8 : Figure 4 B-direction cross-sectional view. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A metal rubber isolator press-fitting tool comprises a base 1, a cylinder 2 and a pressing plate 3 which can be coaxially assembled, wherein the base 1 is used to carry a jacket 4 of the metal rubber isolator, a first limit pin 11 is connected to the base 1, and a first limit hole 21 matching the first limit pin 11 is provided at the lower portion of the cylinder 2; a second limit pin 31 is connected to the bottom surface of the pressing plate 3, an edge of the pressing plate 3 is connected to a first guide pin 33 extending in a press-fitting direction, and a first guide hole 22 matching the first guide pin 33 is provided at the upper portion of the cylinder 2; when the jacket 4 and the cylinder 2 of the metal rubber isolator are coaxially assembled to the base 1 in sequence, the first limit pin 11 is used to limit the rotation of the jacket 4 and the cylinder 2, and the pressing plate 3 can always provide vertical downward pressure to the upper connecting plate 5 of the metal rubber isolator under the guiding action of the first guide pin 33, and the second limit pin 31 is used to limit the rotation of the upper connecting plate 5.

[0019] like Figure 1 and Figure 2 , Figure 7 , Figure 8 As shown. In this embodiment, the base 1 is a flat base, the cylinder 2 is a cylindrical cylinder, the outer sleeve 4 and the core shaft 6 that carry the metal rubber vibration isolator can be placed on the base 1, and the cylinder 2 can be sleeved on the outside of the metal rubber vibration isolator. When the outer sleeve 4 and the base 1 are assembled, the first limit pin 11 needs to pass through the mounting hole 1 41 and needs to pass through the first limit hole 21, and the first limit pin 11 is diagonally distributed. Therefore, the outer sleeve 4 and the cylinder 2 will not be twisted after being limited. During press fitting, after the upper connecting plate 5 is sleeved on the top of the core shaft 6, the second limit pin 31 passes through the mounting hole 2 51, which can limit the upper connecting plate 5 to prevent it from twisting. When pressure is applied during press fitting, the first guide pin 33 of the pressing plate 3 cooperates with the first guide hole 22 opened on the upper part of the cylinder 2 to maintain the downward pressure in the vertical direction. When the accuracy of the aforementioned limiting guide components is guaranteed, twisting between the upper connecting plate 5, the core shaft 6, and the outer sleeve 4 can be prevented during the press fitting process.

[0020] In a more preferred embodiment, the middle part of the lower surface of the pressing plate 3 has a first spring pin 32 extending in the press-fitting direction. During the press-fitting process, the end of the first spring pin 32 is always in contact with the top mounting hole 61 of the core shaft 6 of the metal rubber vibration isolator, and there is a circumferential limit portion between the first spring pin 32 and the mounting hole 61 that contacts each other. Figure 7 , Figure 8As shown. Under the above embodiment, it can be ensured to a certain extent that there is no twisting between the upper connecting plate 5, the core shaft 6, and the outer sleeve 4. However, since the core shaft 6 and the outer sleeve 4 are not rigidly connected, although the upper connecting plate 5 will not twist during the press-fitting process, when pressure is applied, the upper connecting plate 5 and the core shaft 6 may be relatively twisted due to the existence of friction. After the pressure is applied and the press-fitting is completed, the upper connecting plate 5 and the core shaft 6 are connected by interference fit, and the core shaft 6 will rotate slightly due to the rebound of the rubber body. Therefore, under the above embodiment, there will still be a small number of cases where the relative position between the upper connecting plate 5 and the outer sleeve 4 is deflected. In order to further prevent the core shaft 6 from deflecting during the press-fitting process, in this embodiment, the first spring pin 32 can form a mutual restriction with the top mounting hole 61 of the core shaft 6 through a circumferential limit portion, thereby limiting the torsion of the core shaft 6.

[0021] Preferably, the first spring pin 32 includes a blind hole 321 opened in the center of the pressing plate 3, and a second spring 322 is arranged in the blind hole 321, and the upper end of the second spring 322 is connected to a pin 323. The pin 323 can cooperate with the square top mounting hole 61 of the mandrel 6 to prevent the mandrel 6 from twisting. The first spring pin 32 can be extended and retracted under the action of the second spring 322, because when the pin 323 contacts the bottom surface of the top mounting hole 61 of the mandrel 6, the pressing plate 3 is pressed down to press the upper connecting plate 5 down, and the pin 323 should interfere with the bottom surface of the top mounting hole 61. At this time, the pin 323 can compress the second spring 322 to retract. After the press-fitting is completed, the pin 323 rebounds under the action of the second spring 322. The circumferential limit portion between the first spring pin 32 and the top mounting hole 61 of the mandrel 6 has a variety of structural forms, for example, the pin 323 can be square or waist-shaped or spline-shaped or elliptical, etc., and the top mounting hole 61 also has a corresponding matching shape.

[0022] In a more preferred embodiment, a limiting member is also connected to the base 1 , and after the cylinder 2 is assembled to the base 1 , the first limiting pin 11 and the limiting member are used to limit the rotation of the outer sleeve 4 and the cylinder 2 .

[0023] One embodiment of the limiting member may include a third limiting pin 12 connected to the upper surface of the base 1, and a limiting groove 23 provided at the lower part of the cylinder 2. The limiting groove 23 may be an open groove provided at the bottom edge of the cylinder 2, or may be an open circular hole.

[0024] like Figure 6 As shown, the lower surface of the pressing plate 3 has a boss 34, and during the pressing process, the boss 34 serves as a contact surface with the upper connecting plate 5 for transmitting the downward pressure.

[0025] In a more preferred embodiment, the first limiting pin 11 comprises a hollow connecting column 111 connected to the base 1, wherein the hollow connecting column 111 has a first spring 112, and the upper end of the first spring 112 is connected to a column pin 113. Figure 8 As shown, when the outer cover 4 is assembled on the base 1, the mounting hole 41 and the first stop pin 11 need to be aligned. At this time, if the first stop pin 11 is a rigid part, if the alignment is not accurate, the first stop pin 11 may be damaged due to the weight of the outer cover 4. Therefore, the first stop pin 11 is designed as a spring pin. If the alignment is not accurate, the pin 113 will retract to prevent damage.

[0026] In a more preferred embodiment, a top column 13 is also connected to the upper surface of the base 1, and during the press-fitting process, the top surface of the top column 13 is in contact with the rubber bottom of the core shaft 6 of the metal rubber vibration isolator. Figure 7 and Figure 8 As shown, some metal spring shock absorbers have a conical rubber body vulcanized to connect the core shaft 6 and the outer sleeve 4, so there will be a gap between the core shaft 6 and the bottom of the outer sleeve 4. When the outer sleeve 4 is assembled on the base 1, the core shaft 6 cannot contact the bottom surface of the base 1. In order to provide support for the bottom of the core shaft 6, a top column 13 is designed on the upper surface of the base 1 so that the core shaft 6 will not drop due to the downward pressure during the press-fitting process. Of course, for metal rubber isolators whose bottom surfaces of the core shaft 6 and the outer sleeve 4 are in the same plane, it is not necessary to design this top column 13. The bottom of the top column 13 has a concave arc surface 131, which is a more optimized design. The concave arc surface 131 matches the rubber profile of the bottom of the core shaft 6, so that the rubber at the bottom of the core shaft 6 can be completely fitted to the top of the top column 13, and the core shaft 6 is more firmly supported.

[0027] In a more preferred embodiment, Figure 7 and Figure 8 and Figure 3 The cylinder 2 has a top flange 24 on the top and a bottom flange 25 on the bottom, the first limiting hole 21 and the limiting groove 23 are both formed on the bottom flange 25 , and the first guide hole 22 is formed on the top flange 24 .

[0028] In a more preferred embodiment, the first limiting hole 21 , the limiting groove 23 , the first guide hole 22 , the first limiting pin 11 , the second limiting pin 31 , and the first guide pin 33 are all distributed in pairs diagonally.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal rubber vibration isolator press-fitting tool, characterized in that: The invention comprises a base (1), a cylinder (2) and a pressure plate (3) which can be coaxially assembled, the base (1) being used to bear a jacket (4) of a metal rubber vibration isolator, a first limit pin (11) being connected to the base (1), a first limit hole (21) matching the first limit pin (11) being provided at the bottom of the cylinder (2); a second limit pin (31) being connected to the bottom surface of the pressure plate (3), a first guide pin (33) extending in a pressing direction being connected to the edge of the cylinder (2), A first guide hole (22) matching with the first guide pin (33) is provided in the upper portion; when the outer sleeve (4) and the cylinder (2) of the metal rubber vibration isolator are coaxially assembled on the base (1) in sequence, the first limit pin (11) is used to limit the rotation of the outer sleeve (4) and the cylinder (2); the pressure plate (3) can always provide vertical downward pressure to the upper connecting plate (5) of the metal rubber vibration isolator under the guiding action of the first guide pin (33); and the second limit pin (31) is used to limit the rotation of the upper connecting plate (5).

2. The metal rubber isolator press-fitting tool as claimed in claim 1, characterized in that: The middle portion of the lower surface of the pressing plate (3) has a first spring pin (32) extending in the pressing direction. During the pressing process, the end of the first spring pin (32) is always in contact with the top mounting hole (61) of the core shaft (6) of the metal rubber vibration isolator, and a circumferential limiting portion in contact with each other is provided between the first spring pin (32) and the mounting hole (61).

3. The metal rubber isolator press-fitting tool as claimed in claim 2, characterized in that: The base (1) is also connected to a limiting member, and after the cylinder (2) is assembled on the base (1), the first limiting pin (11) and the limiting member are used to limit the rotation of the outer sleeve (4) and the cylinder (2).

4. The metal rubber vibration isolator press-fitting tool as claimed in claim 3, characterized in that: The limiting component comprises a third limiting pin (12) connected to the upper surface of the base (1), and also comprises a limiting groove (23) provided at the lower part of the cylinder (2).

5. The metal rubber vibration isolator press-fitting tool as claimed in claim 1, characterized in that: The first limiting pin (11) comprises a hollow connecting column (111) connected to the base (1), a first spring (112) is provided in the hollow connecting column (111), and the upper end of the first spring (112) is connected to a column pin (113).

6. The metal rubber isolator press-fitting tool as claimed in claim 2, characterized in that: The first spring pin (32) comprises a blind hole (321) opened in the center of the pressure plate (3), a second spring (322) is arranged in the blind hole (321), the upper end of the second spring (322) is connected to a column pin 1 (323), and the column pin 1 (323) is square, waist-shaped or spline-shaped.

7. The metal rubber isolator press-fitting tool as claimed in claim 1, characterized in that: A top column (13) is also connected to the upper surface of the base (1), and during the press-fitting process, the top surface of the top column (13) contacts the rubber bottom of the core shaft (6) of the metal rubber vibration isolator.

8. The metal rubber vibration isolator press-fitting tool as claimed in claim 7, characterized in that: The bottom of the top column (13) has an inner concave arc surface (131), and the inner concave arc surface (131) matches the rubber profile of the bottom of the core shaft (6).

9. The metal rubber vibration isolator press-fitting tool as claimed in claim 8, characterized in that: The cylinder (2) has a top flange (24) at the top and a bottom flange (25) at the bottom, the first limiting hole (21) and the limiting groove (23) are both provided on the bottom flange (25), and the first guide hole (22) is provided on the top flange (24).

10. The metal rubber vibration isolator press-fitting tool as claimed in claim 9, characterized in that: The first limiting hole (21), the limiting groove (23), the first guide hole (22), the first limiting pin (11), the second limiting pin (31), and the first guide pin (33) are all distributed diagonally in pairs.

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