JP2009063123A - Air spring for vehicle - Google Patents

Air spring for vehicle Download PDF

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Publication number
JP2009063123A
JP2009063123A JP2007233093A JP2007233093A JP2009063123A JP 2009063123 A JP2009063123 A JP 2009063123A JP 2007233093 A JP2007233093 A JP 2007233093A JP 2007233093 A JP2007233093 A JP 2007233093A JP 2009063123 A JP2009063123 A JP 2009063123A
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JP
Japan
Prior art keywords
plate
air spring
portion
support portion
body frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2007233093A
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Japanese (ja)
Inventor
Eijiro Honda
永二郎 本多
Original Assignee
Toyo Tire & Rubber Co Ltd
東洋ゴム工業株式会社
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Application filed by Toyo Tire & Rubber Co Ltd, 東洋ゴム工業株式会社 filed Critical Toyo Tire & Rubber Co Ltd
Priority to JP2007233093A priority Critical patent/JP2009063123A/en
Publication of JP2009063123A publication Critical patent/JP2009063123A/en
Application status is Withdrawn legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an air spring capable of suppressing or eliminating such inconvenience as an increase in the costs for production equipment, the weight of the product, etc. by reducing to possible minimum the thickness change of a plate-form supporting part or eliminating necessity for the change even through the relative position of the body frame arranged on the surface of the plate-form supporting part is changed variously. <P>SOLUTION: The air spring for a vehicle is equipped with the plate-form supporting part 11 located on the vehicle body side, a part 12 to be supported on the wheel side, and a diaphragm 13 to be joined air-tightly with the area over the two parts 11 and 12, wherein the plate-form supporting part 11 is furnished with a mounting means T for the body frame F arranged on the surface of the part 11 in crossing it and provided rigidly with concave/convex grooves M in such a condition as straddling the end line L of the body frame F. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicular air spring used in truck automobiles, railway vehicles, and the like, and more specifically, a plate-like support portion on the vehicle body side, a supported portion on the wheel side, and a hermetic joint over both. The present invention relates to an air spring for a vehicle having a diaphragm.

  As disclosed in Patent Document 1, this type of air spring includes an upper disk (plate-like support portion), a cylindrical diaphragm, and a piston (supported portion), and is used for elastic deformation of the diaphragm. Accordingly, there is known a structure in which a piston is formed with a peripheral surface capable of rolling and guiding an inverted tube portion folded back at the lower end side. Moreover, as disclosed in Patent Document 2, an outer cylinder (plate-like support portion), an inner cylinder (supported portion), and a diaphragm that is airtightly disposed over both of them are provided. Things are also known.

  For example, when the air spring having the former structure is applied to a vehicle such as a truck or a bus, generally, the piston is mounted on a member on the wheel side, and the body frame is mounted on the upper disk, and is incorporated in the actual machine. (See FIG. 3). In that case, conventionally, as shown in FIG. 7, the relationship between the air spring A and the vehicle body frame F is such that the left-right center (center in the left-right dimension) X of the main frame member 1 having a U-shaped cross section is a plan view. In this case, the bolt is such that, for example, the lower horizontal wall 1A of the main frame member 1 and the plate-like support portion 11 are shown by an imaginary line. -It is connected and integrated using a nut 30.

  In other words, the vehicle body frame F is disposed relative to the plate-like support portion 11 in a state of being symmetrical or substantially symmetrical in dimension, and the air spring A and the vehicle body frame F, that is, the plate-like support portion 11 and the main frame. With the member 1, the vertical load is wide across the entire plate-like support portion 11 and acts evenly on the left and right, and the arrangement structure has a balanced support strength. In FIG. 7, 13 is a cylindrical diaphragm, and 12 is a piston.

  Depending on the type and size of the truck or the specification change of the vehicle body structure, the main frame member may not necessarily pass through the left and right center of the plate-like support portion. That is, as in the comparative example shown in FIG. 6, the main frame member 1 having a U-shaped cross section is arranged in a lateral direction with respect to the center P of the air spring A (inward in the lateral direction of the vehicle body in FIG. 6). This is the case. In this case, an L-shaped reinforcing plate 15 connected by means such as bolting is provided across the vertical wall portion 1B of the main frame member 1 and the plate-like support portion 11, and the reinforcing plate 15 is interposed through the reinforcing plate 15. In many cases, the main frame member 1 and the plate-like support portion 11 are connected and integrated.

In the case of the eccentric structure shown in FIG. 6, when a lateral force such as a curved run is applied, the vicinity of the left and right central portions of the plate-like support portion 11 (the vertical wall portion 17 and the vertical wall portion 1B of the bracket 15 are separated). Since the bending moment acts on the position of the mating portion) and the load is transmitted from the reinforcing plate 15, the plate-like plate-like support portion 11 has a larger load (bending load) than the structure shown in FIG. Is easy to act. Therefore, as a countermeasure, as shown in FIG. 6, the plate thickness of the plate-like support portion 11 is made thicker than the plate thickness of the plate-like support portion 11 shown in FIG.
JP 2007-107665 A JP 2006-329280 A

  6 and 7, the vehicular air spring has a structure in which the upper peripheral portion of the diaphragm 13 is caulked (clamped) to the outer peripheral portion of the plate-like support portion 11 to be airtightly joined. In the case where the plate-like support portion 11 is formed of a sheet metal material by a steel plate press, there is a problem that the plate thickness of the plate-like support portion 11 changes depending on the vehicle body structure and the like as described above. That is, the press die must be changed due to the change in the plate thickness, and the press pressure must also be changed. This causes equipment costs such as die costs and consequently product costs to increase, and production. There was also annoyance that equipment and its management items increase. Moreover, it is not good at the point that weight and material cost increase by the plate | board thickness increase of the plate-shaped support part 11. FIG.

  The object of the present invention is to change the plate thickness of the plate-like support portion even if the relative position of the vehicle body frame arranged on the surface of the plate-like support portion may be changed variously by reviewing and improving the structure. However, it is an object of the present invention to provide an improved air spring that can suppress or eliminate inconveniences such as a production equipment cost and an increase in product weight.

The invention according to claim 1 is a vehicle having a plate-like support portion 11 on the vehicle body side, a supported portion 12 on the wheel side, and a diaphragm 13 that is hermetically joined over both 11 and 12. For air springs,
Attaching means T for the vehicle body frame F disposed across the surface of the plate-like support portion 11 is provided on the plate-like support portion 11, and an end line L of the vehicle body frame F is provided on the plate-like support portion 11. The concavo-convex groove M in a straddling state is integrally formed.

  The invention according to claim 2 is the air spring for vehicle according to claim 1, wherein the plate-like support portion 11 is made of a sheet metal material in which the concave and convex grooves M are integrally formed. It is.

  According to a third aspect of the present invention, in the vehicle air spring according to the first or second aspect, the mounting means T includes a standing wall portion 17 attached to the vertical wall portion 1B of the vehicle body frame F, and the plate-like support. It is characterized by having a bracket 15 provided with a substrate portion 18 attached to the surface of the portion 11.

  The invention according to claim 4 is the air spring for vehicle according to claim 3, wherein both the groove ends 21a and 21a are located in the portion where the concave and convex groove M is attached to the base plate portion 18, and the circular shape It is formed in the C-shaped groove | channel 21 which becomes concentric with the plate-shaped support part 11 or substantially concentric.

  According to a fifth aspect of the present invention, in the vehicle air spring according to the fourth aspect of the present invention, the air supply fixed to the plate-like support portion 11 at a location between the groove ends 21a, 21a in the base plate portion 18 is provided. The bracket 15 is attached to the surface of the plate-like support portion 11 by providing an insertion hole 18a through which the exhaust tube 14 is passed and tightening the substrate portion 18 with a nut 20 screwed to the outer peripheral portion of the air supply / exhaust tube 14. It is characterized by being attached to.

  According to the first aspect of the present invention, since the plate-like support portion is integrally formed with the concave and convex grooves extending across the end line of the vehicle body frame, the vehicle body frame is biased in the left-right direction of the vehicle body of the plate-like support portion. The plate-like support part has sufficient strength and rigidity to withstand bending moments that occur in the end line due to rolling or curved running, etc., and bending loads acting through the mounting means. Become. Due to the increase in strength and rigidity due to the concave and convex grooves, it can withstand the conventional thin thickness (see FIG. 7) without increasing the plate thickness of the plate-like support portion 11 like the air spring A of the comparative example shown in FIG. Accordingly, there is no increase in mold cost due to the additional setting of the mold as described above, and there is no increase in management cost for production equipment, and almost no increase in weight as a product occurs.

  As a result, even if the relative position of the vehicle body frame arranged on the surface of the plate-like support part may be changed variously due to the review and improvement of the structure, the plate thickness change of the plate-like support part is the minimum necessary An improved air spring can be provided so that inconveniences such as production equipment costs and increased product weight can be suppressed or eliminated as the limit is sufficient or unnecessary. Further, if the plate-like support portion is made of a sheet metal material in which the concave and convex grooves are integrally formed as in claim 2, it is possible to realize a cheaper air spring while having sufficient strength and rigidity. There is. For example, if the diaphragm is made of a cylindrical rubber film having an inverted cylinder portion, an air spring suitable for trucks can be obtained.

  According to the invention of claim 3, since the bracket having the upright wall portion attached to the vertical wall portion of the vehicle body frame and the base plate portion attached to the surface of the plate-like support portion is provided as the attachment means, the bracket The present invention provides an air spring that can reduce the load and bending moment exerted on the plate-like support by the other company's frame, and can further enhance any of the above effects according to the invention of claim 1 or 2. can do.

  According to the invention of claim 4, since the C-shaped groove concentrically or substantially concentric with the circular plate-like support portion is formed by positioning both ends of the groove at the portion where the substrate portion is attached. It can be reinforced with a well-balanced strength suitable for the shape of the spring (plate-shaped support part) and the contact area between the substrate part and the plate-shaped support part can be increased as much as possible by making the concave and convex grooves C-shaped instead of circular. In addition, it is preferable in terms of adhesion strength between the bracket and the plate-like support portion.

  According to the invention of claim 5, the air supply / discharge means provided in the air spring is provided as an air supply / discharge cylinder fixed between both ends of the C-shaped groove in the plate-like support portion, and the air supply / discharge cylinder The bracket is fixed to the plate-like support portion by a nut that is screwed using the screw. With such a configuration, the above-described effect according to the invention of claim 4 can be obtained while a rational configuration capable of exhibiting both functions of the air supply / discharge function and the bracket fixing function with essential necessary parts. There is.

  Hereinafter, an embodiment of an air spring for a vehicle according to the present invention will be described with reference to the drawings in the case of being used in a portion for suspending a rear wheel of a truck. 1 and 2 are a cross-sectional view and a plan view of the air spring according to the first embodiment, FIG. 3 is a schematic perspective view showing an example of mounting on a truck rear wheel suspension, and FIGS. FIG. 6 is a sectional view of an air spring according to a comparative example, and FIG. 7 is a sectional view showing a conventional air spring.

[Example 1]
First, the structure of the rear wheel suspension portion of the truck will be outlined. As shown in FIG. 3, the vehicle body frame F includes a pair of left and right main frame members 1, 1 extending in the front-rear direction, and has rear-wheel shafts 2, 2 on the left and right below the rear part. The differential device 3 is suspended and supported. A tire (an example of a wheel) (not shown) is attached to each rear wheel shaft 2. A suspension beam 5 is connected to the left and right case ends 4a, 4a of the differential case 4 in the differential device 3, and vehicle air springs (hereinafter simply referred to as "vehicle air springs") are respectively provided between the front and rear ends of the suspension beam 5 and the main frame member 1. A) (abbreviated as “air spring”). In addition, 6 is a V rod for supporting the differential device 3, 7 is a torque rod connecting the support arm 8 fixed to the main frame member 1 and the case end 4a, 9 is a stabilizer, and 10 is a shock absorber.

  As shown in FIGS. 1 and 2, the truck air spring A includes an upper plate (an example of a plate-like support portion) 11 on the vehicle body side, a piston (an example of a supported portion) 12 on the wheel side, A diaphragm 13 that is hermetically joined over the both 11 and 12 is provided. A cylindrical rubber film diaphragm 13 is hermetically joined to the upper end of the piston 12, and an outer peripheral surface capable of rolling and guiding an inverted cylinder portion 13C formed by folding the piston side end side with elastic deformation of the diaphragm 13. 12 b is formed on the piston 12. In FIGS. 1 and 2, the arrow A indicates the inner direction in the left-right direction of the vehicle body, and the arrow B indicates the outer direction.

  More specifically, a large-diameter bead portion formed at the upper end of the vertical cylindrical diaphragm 13 that constitutes the wall portion of the first internal space S1 that is a gas chamber and the vertical axis P thereof. An air spring A is configured by including a disk-like upper plate 11 that is caulked and fixed to 13A, and a piston 12 that is closely fitted to a small-diameter bead portion 13B that is formed at the lower end of the diaphragm 13. The upper plate 11 includes a bracket (an example of an attachment means T) 15 that is an attachment plate for attaching and fixing the upper plate 11 to the vehicle body frame F (see FIG. 3), and an air supply / exhaust cylinder for supplying and discharging air into the diaphragm 13. 14. The air supply / exhaust cylinder 14 is air-tightly fixed to the upper plate 11 through penetration welding, and has an air supply / discharge hole 14a that communicates with the first internal space S1.

  The piston 12 is a straight cylinder-shaped main body that covers a small-diameter fitting cylinder portion 12A to which the lower end portion of the diaphragm 13 is externally fitted and a reverse cylinder portion 13C that is a portion where the lower side of the diaphragm 13 is folded inward. It has a cylindrical portion 12 </ b> B and has a common axis P with the diaphragm 13. The main cylinder 12B and the fitting cylinder 12A having a smaller diameter and disposed above are integrally formed by press molding, and the fitting cylinder 12A and the main cylinder 12B have an annular step surface 12C. Connected through. Thus, the diaphragm 13 is pushed so as to cover the piston 12, and the outer peripheral surface 12b of the main cylinder portion 12B is configured to be able to roll and guide the inverted cylinder portion 13C.

  Further, a large circular hole 16 is formed in the upper surface of the fitting cylinder portion 12A, and the second internal space S2 and the first space S1 which are inside the piston 3 are communicated with each other through the large circular hole 16. . Although not shown, there is a bottom plate portion that covers the bottom of the piston 3, and the bottom plate portion is connected to the suspension beam 5 using appropriate attachment means (for example, bolts and nuts). The That is, the piston 12 is attached to a wheel side member (suspension beam 5). The outer peripheral end of the upper plate 11 is formed in a curling portion 11A that is processed to be folded downward and folded in order to fix the large-diameter bead portion 13A by caulking, whereby the diaphragm 13 and the upper plate 11 are connected to each other. Airtightly joined.

  As shown in FIGS. 1 and 2, the main frame member 1 having a U-shaped cross section includes a lower horizontal wall portion 1A, a vertical wall portion 1B, and an upper horizontal wall portion 1C. The outer surface 1b is disposed relative to the air spring A so as to slightly exceed the axial center P of the air spring A. The inner ends of both lateral wall portions 1A, 1B are extended inward within a range that fits within the diameter of the upper plate 11. The bracket 15 includes an upright wall portion 17 attached to the outer surface of the vertical wall portion 1B of the main frame member 1 by bolts, nuts, etc., not shown, and a substrate portion 18 attached to the upper surface (an example of the surface) 11B of the upper plate 11. And a sheet metal member having reinforcing wall portions 19 disposed at the front and rear ends.

  An insertion hole 18a for inserting the air supply / exhaust cylinder 14 is formed in the front and rear center of the substrate part 18, and a male screw 14b is formed on the outer periphery of the air supply / exhaust cylinder 14, and the insertion hole 18a passes through the insertion hole 18a. In this state, the bracket 15 can be fixed to the upper plate 11 by screwing the nut 20 into the air supply / discharge cylinder 14. That is, the mounting means T for the vehicle body frame F arranged across the upper surface 11B of the upper plate 11 is constituted by the bracket 15, the nut 20, and the bolts and nuts (not shown) that connect the upright wall portion 17 and the vertical wall portion 1B. Has been.

  As shown in FIGS. 1 and 2, the upper plate 11 is integrally formed with a concavo-convex groove M in a state straddling the end line L of the main frame member 1. The concave / convex groove M is formed in a C-shaped groove 21 which is concentric with the circular upper plate 11 and has both groove ends 21 a and 21 a at the portion where the substrate portion 18 is attached. The air supply / discharge cylinder 14 is located at the center between the front and rear of both the groove ends 21a, 21a. The C-shaped groove 21 is a groove recessed downward and greatly improves the rigidity of the upper plate 11 made of a sheet metal material.

  Accordingly, because the main frame member 1 crosses the position of the upper plate 11 that is greatly biased inward in the left-right direction of the vehicle body, the bending moment acting on the end line L due to rolling or curved running, etc., and thereby via the bracket 15 The upper plate 11 has sufficient strength and rigidity to withstand bending loads acting. That is, unlike the air spring A of the comparative example shown in FIG. 6, it can withstand the conventional thin thickness (see FIG. 7) without increasing the plate thickness of the upper plate 11. Therefore, there is an advantage that there is no increase in the mold cost due to the additional setting of the mold as described above, and there is no increase in the management cost related to the production facility, and there is almost no increase in the weight as a product.

[Example 2]
As shown in FIG. 4, the air spring A according to the second embodiment is the same as the air spring A according to the first embodiment except that the shape of the concave and convex grooves M is different. The different concavo-convex grooves M are composed of a plurality (four places) of linear grooves 22, 23, 23, 22 arranged in the front-rear direction so as to extend straight from side to side. Each of the linear grooves 22 and 23 is formed to have intrusion portions 22 a and 23 a that enter the lower part of the bracket 15. For example, the short linear grooves 22 and 22 located at the front and rear ends are formed on the substrate portion 18. You may form in the state which remove | deviates back and forth. A means for fixing the bracket 15 to the upper plate 11 by welding may be employed.

Example 3
As shown in FIG. 5, the air spring A according to the third embodiment may have a structure in which a downward U-shaped leg member 24 on which the main frame member 1 is mounted is integrated on the upper plate 11. The leg member 24 made of a sheet metal material is composed of front and rear vertical wall portions 24A and 24B, and an upper horizontal wall 24C that is a horizontal portion on which the main frame member 1 is placed, and is an air spring according to the second embodiment. It is fixed to the upper surface 11B of the upper plate 11 of A by means such as welding.

  In FIG. 5, the front and rear vertical wall portions 24A and 24B are positioned on the upper surface 11B while avoiding the concave and convex grooves M, and are fixed by welding or the like, and an L-shaped bracket 15 that is a standing wall portion 17 and a reinforcing wall portion 19 The end surface 24t of the upper horizontal wall 24C and the rear vertical wall portion 24B and the standing wall portion 17 are brought into contact with each other and welded together. As described above, the bracket 15 and the leg member 24 to be welded to the upper surface 11B are arranged with their front and rear positions shifted from each other, but the configuration is not limited thereto.

[Another Example]
The attachment means T can have various configurations. For example, in the case of a structure in which the bracket 15 is integrated with the main frame member 1, the mounting means T includes an air supply / discharge cylinder 14 and a nut 20 for fixing the bracket 15. Is done. A means for effectively increasing the strength and rigidity is also possible as a structure in which the depth of the concavo-convex groove M is maximized in the end line L and becomes shallower as it goes away from the end line L. Further, the present invention can also be applied to an air spring having a configuration as shown in Patent Document 2.

Sectional side view of the air spring for vehicles by Example 1 Plan view of the air spring of FIG. Schematic perspective view showing an example of mounting an air spring to a truck rear wheel suspension The top view of the air spring by Example 2 The top view of the air spring by Example 3 Sectional drawing which shows the air spring of a comparative example Sectional view showing a conventional air spring

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Plate-shaped support part 12 Supported part 12b Circumferential surface 13 Diaphragm 13C Flip cylinder part 14 Air supply / discharge cylinder 15 Bracket 17 Standing wall part 18 Substrate part 18a Insertion hole 20 Nut 21 C-shaped groove 21a Groove end F Body frame M Concave groove T Attachment means

Claims (5)

  1. A vehicular air spring comprising a plate-like support portion on the vehicle body side, a supported portion on the wheel side, and a diaphragm that is hermetically joined over both of them,
    Mounting means for the vehicle body frame arranged transversely on the surface of the plate-like support portion is provided in the plate-like support portion, and the plate-like support portion is integrally provided with an uneven groove extending across the end line of the vehicle body frame. The air spring for vehicles currently formed.
  2.   The vehicular air spring according to claim 1, wherein the plate-like support portion is made of a sheet metal material in which the concave and convex grooves are integrally formed.
  3.   The said attachment means is comprised including the bracket which has a standing wall part attached to the vertical wall part of the said vehicle body frame, and the board | substrate part attached to the surface of the said plate-shaped support part. The air spring for vehicles as described in 2.
  4.   The said uneven groove | channel is formed in the C-shaped groove | channel which both groove ends are located in the part to which the said board | substrate part is attached, and is concentric or substantially concentric with the said circular plate-shaped support part. Air spring for vehicles.
  5.   An insertion hole for passing an air supply / discharge tube fixed to the plate-like support portion is provided at a location between the both ends of the groove in the substrate portion, and a nut screwed to the outer peripheral portion of the air supply / discharge tube The vehicle air spring according to claim 4, wherein the bracket is attached to a surface of the plate-like support portion by tightening the substrate portion.
JP2007233093A 2007-09-07 2007-09-07 Air spring for vehicle Withdrawn JP2009063123A (en)

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JP2007233093A JP2009063123A (en) 2007-09-07 2007-09-07 Air spring for vehicle

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JP2007233093A JP2009063123A (en) 2007-09-07 2007-09-07 Air spring for vehicle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2488770A4 (en) * 2009-10-14 2018-05-16 Firestone Industrial Products Company, LLC End member, gas spring assembly and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2488770A4 (en) * 2009-10-14 2018-05-16 Firestone Industrial Products Company, LLC End member, gas spring assembly and method

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Effective date: 20101207