JP5277080B2 - Air spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air spring incorporated at a regular position and modified to prevent a trouble of twist of a tubular rubber film during piston fixing operation while employing a structure attaching a piston on a support member (unsprung part) thereof by a bolt disposed on an axial center. <P>SOLUTION: This air spring includes the tubular rubber film 1, a large diameter plate shape member 2 airtightly joined to one end part in an axial center P direction, and the piston 3 airtightly joined to another end part in the axial center P direction of the tubular rubber film 1, and has a circumference surface 7 which can roll and guide an inside out tube part 1C formed by turning back another end parts side with elastic deformation of the tubular rubber film 1 formed on the piston 3. The piston 3 is equipped with a rotation prevention mechanism B preventing rotation around the axial center P relatively to a piston support member f supporting the same. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to an air spring used for truck cars, railway vehicles, and the like, and more particularly to an air spring that improves the assembly of a piston.

  Conventionally, an air spring has a cylindrical rubber membrane, a large-diameter plate-like member that is airtightly joined to one end portion in the axial direction of the cylindrical rubber membrane, and a piston that is airtightly joined to the other end portion in the axial direction of the cylindrical rubber membrane. And a peripheral surface capable of rolling and guiding an inverted cylindrical portion formed by folding the other end side with the elastic deformation of the cylindrical rubber film is formed on the piston. As such conventional techniques, those disclosed in Patent Document 1 and Patent Document 2 are known.

  In order to assemble an air spring to an actual installation location of an automobile or the like to make an air spring structure, a large-diameter plate-like member is attached to the upper part of a spring such as a body frame, and the piston is attached to the lower part of a spring such as a suspension arm that supports an axle. Comes to be installed. In this case, the large-diameter plate-like member is attached to the upper part of the spring in a positioning state by a plurality of bolts through a bracket fixed thereto. On the other hand, the piston is provided with a bolt or a nut that is integrally provided along the center (axial center) thereof, and is attached to the lower part of the spring by a set of bolts and nuts.

  Therefore, when the piston is fastened to be attached to the lower part of the spring, the piston is operated with the other hand while the piston is supported with the other hand, but the piston is often rotated by the tightening torque. is there. Since the cylindrical rubber film is greatly twisted when it is pivoted to a large extent, the problem can be immediately recognized and the reassembly operation is forced. Accordingly, there is a problem that extra man-hours may occur.

  In addition, the piston may turn slightly from its normal position and the cylindrical rubber film may be assembled in a slightly twisted state. In addition, there is a problem that the quality is likely to be deteriorated, such as early breakage of the cylindrical rubber film. Therefore, the means for attaching the piston with one bolt at the center has left room for improvement.

JP 2007-321936 A JP 2007-051745 A

The object of the present invention is to attach the piston to its support member (unsprung part) with a single bolt arranged on the shaft center, but to assemble it at a regular position. An object of the present invention is to provide an air spring which is improved so as not to cause a twisting disadvantage.

The invention according to claim 1 includes a cylindrical rubber film 1, a large-diameter plate-like member 2 hermetically joined to one end in the axial center P direction of the cylindrical rubber film 1, and the axial center P direction of the cylindrical rubber film 1. A peripheral surface 7 having a piston 3 hermetically joined to an end portion and capable of rolling and guiding a reverse cylinder portion 1C formed by folding the other end side with elastic deformation of the cylindrical rubber film 1; In the air spring formed on the piston 3,
A single bolt 9 for supporting the piston 3 on the piston support member f is provided in a state along the axis P direction,
The piston 3 is equipped with a rotation prevention mechanism B that prevents relative rotation around the axis P with the piston support member f,
The anti-rotation mechanism B is provided in the piston support member f and is provided in the engagement hole 11 into which the protrusion 13 protruding in the direction of the axis P can be fitted, or provided in the piston support member f and the axis. It has a projection 15 that can be fitted in the engagement hole 14 that is recessed in the P direction ,
The piston 3 is made of synthetic resin, and the anti-rotation mechanism B can be fitted into a protrusion 13 provided on the piston support member f and projecting in the direction of the axis P, and the inner periphery is hard. The engagement hole 11 is reinforced by a cylindrical member 16 made of a material .

  According to the first aspect of the present invention, the rotation prevention mechanism that prevents the relative rotation around the axis between the piston and the piston support member is provided, so that the piston is moved when the bolt is turned in the tightening direction. No turning around. Therefore, the cylindrical rubber film is greatly twisted and reassembly operation is forced, and it takes extra man-hours, or the cylindrical rubber film is assembled while being slightly twisted, and early bolt loosening or cylindrical rubber film The problem that the quality is likely to be degraded, such as early breakage, is solved. As a result, it is possible to assemble the piston to the support member (unsprung portion) with a single bolt arranged on the shaft center, but to assemble the piston rubber in a proper position, and the cylindrical rubber film is twisted during the piston fixing operation. It is possible to provide an air spring that is improved so as not to occur.

  According to the first aspect of the present invention, the anti-rotation mechanism equipped on the piston can be configured with a simple and inexpensive structure such as an engagement hole in which the protrusion can be fitted, or a protrusion that can be fitted in the engagement hole. There are advantages.

According to the invention of claim 1 , since the engagement hole is reinforced with the cylindrical member made of hard material, even if the piston is made of synthetic resin, the engagement hole can be sufficiently configured without causing damage such as crushing, There exists an advantage that the said effect by invention of Claim 1 can be show | played, making it lightweight and cheap.

Sectional view showing structure of air spring ( Reference Example 1 ) Bottom view of piston Enlarged sectional view of the main part showing the structure of the detent mechanism Front view showing an example of air spring use (air spring structure) The expanded sectional view of the principal part which shows the detent mechanism etc. of Example 1 . Enlarged sectional view of the main part showing the detent mechanism etc. of Reference Example 2 Enlarged sectional view of the main part showing the detent mechanism etc. of Reference Example 3

  Embodiments of an air spring and an air spring structure according to the present invention will be described below with reference to the drawings.

[ Reference Example 1 ]
FIG. 4 shows an air spring A and an air spring device K provided between a body frame (an example of an upper part of a spring) F and an axle side (an example of an unsprung part) f of a truck (which may be a railway vehicle, a bus, etc.). It is. That is, the air spring device K has a configuration in which the air spring A ( Reference Example 1 ) is disposed between the upper and lower plates 27 of the body frame F that supports the passage portion 22 of the vehicle body 21 and the upper surface plate 27 of the axle 24. That is, it is an air spring structure. Incidentally, 25 is a tire, 26 is a tire house, and C is a left and right center of the vehicle body.

  As shown in FIG. 1, the air spring A includes a vertical cylindrical diaphragm (an example of a cylindrical rubber film) 1 that constitutes a wall portion of the gas chamber S, and an upper end of the diaphragm 1 having a longitudinal axis P thereof. A large-diameter bead portion (an example of one end portion) formed on the disk-shaped upper plate (an example of a large-diameter plate-like member) 2 that is caulked and fixed to 1A, and a small-diameter bead portion formed on the lower end of the diaphragm 1 ( An example of the other end portion) is provided with a piston 3 that is closely fitted to 1B. The upper plate 2 includes a mounting bolt 5 for mounting and fixing the upper plate 2 to the vehicle body frame F (see FIG. 4), and an air supply / discharge hole 4 for the gas chamber S. The air supply / exhaust hole 4 is constituted by a metal pipe 12 or the like that is welded to the upper plate 2 and is hermetically fixed.

  The piston 3 includes a main tube portion 6 made of synthetic resin, a bead presser 8 made of metal plate, a mounting bolt 9, and a cushion material 10 made of rubber, soft resin, or the like. As shown in FIGS. 1 and 2, the main cylinder portion 6 is basically mounted with a rolling-side peripheral surface 7 whose bottom end is curved and expands, and a tray-shaped bead retainer 8. Lower recessed portion 6a, a horizontal ring top surface 6b which is an outer peripheral portion of the lower recessed portion 6a, a bolt insertion hole 6c, a downwardly opening engaging hole 11 facing the lower surface 6d of the main cylindrical portion 6, circumferential ribs 6e, 6i, This is a molded product having radiation ribs 6f, 6g, 6h and the like. The lower surface 6 d is a surface that also includes the bottom surfaces of the ribs 6 e to 6 i, and is essentially a surface that can be placed on the upper surface plate 27.

  The bead retainer 8 is integrally provided with a cushion material 10 having a substantially trapezoidal cross-sectional shape by vulcanization adhesion or the like on its upper surface (not shown), so that it passes through a center hole (not shown) in advance. The three parts with the mounting bolt 9 are formed into a complete part. In a state where the bead presser 8 is mounted on the main cylinder portion 6, the small diameter bead portion 1B is fitted and mounted by the cooperation of the fitting cylinder portion 8a and the horizontal ring top surface 6b. The rolling side peripheral surface 7 is covered with an inverted tube portion 1C which is a portion where the lower side of the diaphragm 1 is folded back inward. In this way, the diaphragm 1 is pushed so as to cover the piston 3, and the outer peripheral surface 7 of the main cylinder portion 6 is configured to be able to roll and guide the inverted cylinder portion 1C.

  Next, the detent mechanism B will be described. As shown in FIGS. 1 to 3, the rotation prevention mechanism B that prevents relative rotation about the axis P with the upper surface plate (an example of the piston support member f) 27 of the axle 24 that supports the piston 3 is provided on the piston 3. Equipped. That is, the anti-rotation mechanism B is configured by an engagement hole 11 provided in the main cylinder portion 6 so that a shaft pin (an example of a projection portion) 13 provided on the upper surface plate 27 and protruding in the direction of the axis P can be fitted therein. Has been.

  In the air spring structure in which the air spring A is assembled to the actual machine to form the air spring device K, the upper plate 2 is bolted to the mounting plate 23 and the piston 3 is passed through the hole 27a of the upper surface plate 27 through a single mounting bolt 9. Screwed using a spring washer 9b and a nut 9a. In this case, since the mounting bolt 9 is on the shaft center P, there is a possibility that the piston 3 is rotated by the turning operation of the nut 9a. Therefore, the piston 3 is prevented from being twisted so that the diaphragm 1 is not twisted. The anti-rotation mechanism B functions in order to screw it in place. That is, the piston 3 is assembled in a state in which the relative position between the piston 3 and the axle 24 is fixed by passing the mounting bolt 9 through the hole 27a and fastening the nut at the position where the shaft pin 13 is fitted into the engagement hole 11. Can do.

  In other words, the accompanying rotation preventing structure of the piston 3 is a rotation preventing means D that prevents the relative rotational movement around the axis P between the piston 3 and the upper plate 27 that is the unsprung portion f. That is, the rotation preventing means D includes the shaft pin 13 which is a protrusion t provided on the upper surface plate 27 which is either the piston 3 or the unsprung portion f, and projects in the direction of the axis P, and the piston 3 and the unsprung portion. It is configured by an engagement hole h (engagement hole 11) provided in the piston 3 which is the other of f and into which the shaft pin 13 can be fitted. That is, the air spring A is equipped with a rotation prevention mechanism B, and the air spring device (air spring structure) K is provided with rotation prevention means D.

  The engagement hole 11 serving as the rotation preventing mechanism B is located at a radial position near the intermediate peripheral rib 6i between the outer wall 6A having the rolling side peripheral surface 7 and the intermediate peripheral rib 6i and of the continuous radiation rib 6f. It is formed in the seat part 17 which is built up on the part of the external radiation rib 6h on the extension line. Therefore, even if it is a product made from a synthetic resin, it has a structure that can sufficiently withstand the rotational torque acting on the engagement hole 11 by the screwing operation.

[ Example 1 ]
As shown in FIG. 5, as the first embodiment of the rotation preventing mechanism B, the shaft pin 13 provided in the axle 24 and protruding in the direction of the axis P can be fitted, and the inner periphery is a metal covered cylinder. is constituted by engaging hole 11 is reinforced by 16. This covers the weakness of local stress due to the synthetic resin, and it is convenient if the covered cylinder 16 is inserted when the main cylinder part 6 is molded, but the mounting formed on the main cylinder part 6 A structure in which the covered cylinder 16 is press-fitted into the hole 11A may be used.

The anti-rotation mechanism B of the first embodiment includes a reinforced engagement hole 11 formed in the piston 3 and a shaft pin 13 that is implanted in the upper surface plate 27 and can be fitted into the engagement hole 11. It is also a detent means D that prevents the relative rotational movement of the piston 3 and the upper surface plate 27 around the axis P.

[ Reference Example 2 ]
As shown in FIG. 6, the anti-rotation mechanism B according to the second embodiment can be internally fitted in an engagement hole (an example of an engagement hole) 14 provided in the upper surface plate 27 and recessed in the direction of the axis P. You may be comprised by the projection part 15 projected and formed from the cylinder part 6 below. The protrusion 15 is made of a synthetic resin that is integrally formed with the main cylinder portion 6 (seat portion 17). Both the engagement hole 14 and the protrusion 15 have a circular shape when viewed in the direction of the axis P, but may have other shapes. The anti-rotation mechanism B of the reference embodiment 2 includes a protrusion t that is provided on the piston 3 and protrudes in the direction of the axis P, and an engagement hole h that is provided on the top plate and into which the protrusion t can be fitted. The anti-rotation means D is also used.

[ Reference Example 3 ]
As shown in FIG. 7, Reference Example 3 of the rotation preventing mechanism B is configured so that it can be fitted in an engagement hole (an example of an engagement hole) 14 provided in the upper surface plate 27 and recessed in the axis P direction. You may be comprised by the projection part 15 projected and formed from the cylinder part 6 below. The projecting portion 15 is made of an insert at the time of molding or a metal pin implanted by post-processing (press-fit or the like) on the main cylinder portion 6 (seat portion 17), and is sufficiently strong in strength. The anti-rotation mechanism B of the reference embodiment 3 includes a protrusion t provided on the piston 3 and protruding in the direction of the axis P, and an engagement hole h provided on the upper plate and into which the protrusion t can be fitted. The anti-rotation means D is also used.

[Another Example]
The detent mechanism B by the engagement hole 11 may be provided at a plurality of locations around the axis P. Although illustration is omitted, it is convenient if the mounting bolt 9 is separately provided with a lock nut for fixing the bead presser 8 and the main cylinder portion 6 (see FIG. 1).

DESCRIPTION OF SYMBOLS 1 Cylindrical rubber film 1C Reversed cylinder part 2 Large diameter plate-shaped member 3 Piston 7 Circumference surface 9 Bolt 11 Engagement hole 13 Protrusion part 14 Engagement hole 15 Protrusion part 16 Cylindrical member B Anti-rotation mechanism D Anti-rotation means F Spring upper part P shaft center f piston support member, unsprung portion h engagement hole t protrusion

Claims (1)

A cylindrical rubber film, a large-diameter plate-like member that is airtightly joined to one end portion in the axial direction of the cylindrical rubber film, and a piston that is airtightly joined to the other end portion in the axial direction of the cylindrical rubber film, An air spring formed on the piston with a circumferential surface capable of rolling and guiding an inverted tube portion formed by folding the other end side with elastic deformation of the cylindrical rubber film,
A single bolt for supporting the piston on the piston support member is provided in a state along the axial direction,
The piston is equipped with a rotation prevention mechanism that prevents relative rotation around the axis with the piston support member,
An engagement hole in which the detent mechanism is provided in the piston support member and can be fitted with a protrusion protruding in the axial direction, or an engagement hole provided in the piston support member and recessed in the axial direction It has a protrusion that can be fitted inside,
The piston is made of a synthetic resin, and the anti-rotation mechanism can be fitted into a protrusion provided on the piston support member and projecting in the axial direction, and the inner periphery is a cylindrical member made of a hard material. An air spring constituted by a reinforced engagement hole .

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