JP3144024U - Cylinder boot mounting structure - Google Patents

Abstract

An object of the present invention is to provide a cylinder boot mounting structure capable of improving the assembling performance of a cylinder boot.
A cylinder boot 40 covering a cylinder rod or the like of a power steering cylinder provided on a forklift is installed between a fixed member and a movable member. Both attachment portions 46 provided on the extending portion 43 of the cylinder boot 40 are provided at both ends of the knuckle-side connecting pin 25 that rotatably connects the both tie rods 17 and the knuckle arm 21b of the steering knuckle 21 in the movable member. Support. The mounting holes 47 provided in both the mounting portions 46 are fitted into the annular mounting grooves 33 and 35 provided in the connecting pin 25, respectively.
[Selection] Figure 2

Description

  The present invention relates to a cylinder boot mounting structure in which a cylinder boot that protects against rainwater, dust, or the like by covering a cylinder rod or the like of a cylinder in an industrial vehicle is mounted on a movable member.

  A conventional example of the cylinder boot mounting structure will be described. Since this conventional example relates to a power steering cylinder in a rear axle of a forklift as an industrial vehicle, a cylinder boot mounting structure will be described after the outline of the rear axle is described first. FIG. 5 is a perspective view showing the rear axle of the forklift.

  As shown in FIG. 5, the rear axle beam 11 in the rear axle 10 includes an upper plate member 11a and a lower plate member 11b, and a front plate member 11c and a rear plate member 11d constructed between these plate members 11a and 11b. And is configured in a horizontally long rectangular tube shape. A power steering cylinder 13 is disposed in the central portion of the rear axle beam 11. The power steering cylinder 13 is a double rod type hydraulic cylinder, and includes a cylinder housing 14 and a cylinder rod 15. In addition, one end of a pair of upper and lower tie rods 17 disposed on both upper and lower sides of the cylinder rod 15 is rotatably connected via a connecting pin 19 on the rod side.

  A steering knuckle 21 is rotatably supported via a king pin 23 between an upper plate member 11a and a lower plate member 11b at both end portions (only one end portion is shown in FIG. 5) of the rear axle beam 11. Yes. The steering knuckle 21 is provided with a spindle 21a that projects to the side of the vehicle and a knuckle arm 21b that projects to the rear of the vehicle. Steering wheels (not shown) are supported on the spindle 21a. Further, the other end portions of the pair of tie rods 17 arranged on both the upper and lower sides of the knuckle arm 21b are connected to each other via a connecting pin 25 on the knuckle side. Therefore, as the cylinder rod 15 is expanded and contracted by the operation of the power steering cylinder 13, the steering knuckle 21 is rotated around the axis of the king pin 23 via the tie rod 17, whereby the steered wheels are steered. The cylinder housing 14 corresponds to a “fixed member” in this specification. The cylinder rod 15, both tie rods 17, the knuckle arm 21b, the rod-side connecting pin 19, and the knuckle-side connecting pin 25 correspond to the “movable member” in this specification.

Next, a conventional example of a cylinder boot mounting structure related to the power steering cylinder 13 will be described. FIG. 6 is a perspective view showing a rear axle to which a cylinder boot is attached.
As shown in FIG. 6, the cylinder boot 100 includes an expandable / contracted bellows-shaped bellows tube portion 101, a cylindrical attachment base portion 102 formed at the base end portion of the bellows tube portion 101, and the bellows tube portion 101. And an extension portion 103 extending in the axial direction from the tip portion. The extending part 103 is formed in a semi-cylindrical shape that opens one side (the back side in FIG. 6). Grease nipples 27 are attached to the upper end surfaces of the rod-side connecting pin 19 and the knuckle-side connecting pin 25, respectively.

  Next, a procedure for attaching the cylinder boot 100 will be described. First, the mounting base 102 of the cylinder boot 100 is fitted into the cylinder housing 14 through the cylinder rod 15 of the power steering cylinder 13. In this state, the mounting base 102 is fastened and fixed to the cylinder housing 14 by the hose clamp 105 wound around the mounting base 102. Accordingly, the bellows tube portion 101 covers the periphery of the cylinder rod 15 of the power steering cylinder 13. Subsequently, the extension part 103 is attached to the tie rod 17 by winding the wire 107 around the extension part 103 in a state where the extension part 103 covers the rear side periphery of the tie rod 17. Note that the upper and lower piece portions at the tip of the extending portion 103 have opening holes 103a (only the upper hole portion opening hole is shown in FIG. 6) for loosely inserting the upper and lower end portions of the connecting pin 25 on the knuckle side. Is formed.

  In the cylinder boot 100 that has been mounted as described above, the bellows tube portion 101 is pulled by the extension portion 103 being pulled together with the connecting pin 25 on the knuckle side as the cylinder rod 15 of the power steering cylinder 13 is expanded and contracted. Expands. As the cylinder rod 15 of the power steering cylinder 13 is shortened, the bellows tube portion 101 contracts by the extension portion 103 being pulled together with the connecting pin 25 on the knuckle side.

  Patent Document 1 describes a structure in which a movable end of a cylinder boot is attached to a cylinder rod of a cylinder by tightening a clamp. Note that a wire, a clamp, and the like that attach a movable side end of a cylinder boot to a movable side member such as a tie rod and a cylinder rod are collectively referred to as a “winding member”.

Japanese Utility Model Publication No. 1-94662

According to the conventional mounting structure of the cylinder boot 100, the cylinder boot 100 is mounted on the tie rod 17 which is a movable member by winding the wire 107 as a winding member. In this attachment method, the work of cutting the wire 107 to a required length in advance, the work of twisting the wire 107 after winding, the work of cutting the extra wire 107 after that, etc. are required, and it takes time and effort. There was a problem of poor assembly.
Further, even in the above-mentioned Patent Document 1, there is a problem that the assemblability is poor since the movable side end of the cylinder boot must be attached to the cylinder rod of the cylinder by tightening a clamp as a winding member. .

  The problem to be solved by the present invention is to provide a cylinder boot mounting structure capable of improving the assembling property of the cylinder boot.

The above-mentioned problem can be solved by a cylinder boot mounting structure having the gist of the configuration described in the column of the utility model registration claim.
That is, according to the cylinder boot mounting structure described in claim 1 of the utility model registration claim, the cylinder boot covering the cylinder rod and the like of the cylinder provided in the industrial vehicle has the fixed side member and the movable side member. In this structure, the cylinder boot is constructed so that the end of the cylinder boot on the movable side is supported by a connecting pin that rotatably connects two members of the member on the movable side. Therefore, the assembling property of the cylinder boot can be improved by supporting the end of the cylinder boot on the movable side without using a conventionally required winding member.

  According to the cylinder boot mounting structure described in claim 2 of the utility model registration claim, the movable side end of the cylinder boot is supported on both ends of the connecting pin. Therefore, it is possible to prevent or reduce deformation of the movable side end portion of the cylinder boot due to water pressure of a high pressure car wash or the like. Further, the connecting portion of the two members by the connecting pin can be covered with the end portion on the movable side of the cylinder boot.

  Further, according to the cylinder boot attachment structure described in claim 3 of the utility model registration claim, the cylinder boot is provided with an attachment hole at the movable side end and an annular attachment groove at the connecting pin. Are fitted in the mounting grooves of the connecting pins. Therefore, the movable pin end of the cylinder boot can be easily supported by the connecting pin.

  According to the cylinder boot mounting structure described in claim 4 of the utility model registration claim, a mounting groove is formed in the connecting pin itself. Therefore, another member for forming the attachment groove in the connecting pin can be omitted.

  According to the cylinder boot mounting structure described in claim 5 of the utility model registration claim, the mounting groove is formed by mounting another member on the connecting pin. Therefore, the attachment groove can be easily formed by selectively attaching another member to the connecting pin as required.

  Further, according to the cylinder boot mounting structure described in claim 6 of the utility model registration claim, as a separate member, a bolt fastened to the end face of the connecting pin, and a bolt shaft of the bolt are fitted and A washer that forms a groove wall surface facing the end face of the connecting pin, and a spacer that is fitted to the bolt shaft of the bolt and forms the groove bottom surface of the mounting groove. Therefore, the attachment groove can be formed by attaching the washer and the spacer to the connecting pin with the bolt. In this case, commercially available products can be used as bolts, washers, and spacers.

  According to the cylinder boot mounting structure described in claim 7 of the utility model registration claim, the fixed side end of the cylinder boot is mounted on the cylinder housing of the power steering cylinder of the industrial vehicle, and the tie rod and The movable side end of the cylinder boot is supported on a knuckle-side connecting pin that rotatably connects the steering knuckle. Therefore, the assembling property of the cylinder boot that covers the cylinder rod, the tie rod and the like of the power steering cylinder can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Example 1]
A first embodiment of the present invention will be described. Since this embodiment is applied to the mounting structure of the cylinder boot related to the power steering cylinder 13 in the rear axle 10 (see FIG. 5) of the forklift described above, the description of the outline of the rear axle 10 will be omitted, and different configurations will be described. explain. FIG. 2 is a cross-sectional view showing the mounting structure of the cylinder boot with respect to the connecting pin on the knuckle side.

  As shown in FIG. 2, the connecting pin 25 on the knuckle side in this embodiment has a pin main portion 30 that forms the main body, and a flange shape formed at one end portion (the upper end portion in FIG. 2) of the pin main portion 30. The head 31 and an overhanging pin part 32 protruding on the head 31 are provided. The pin main portion 30 and the overhang pin portion 32 are formed with the same pin outer diameter d1. An annular mounting groove (referred to as an upper mounting groove) 33 is formed in the overhang pin portion 32. The mounting groove 33 is formed with the upper end surface 31a of the head 31 as a lower groove wall surface. In addition, an annular ring groove 34 is formed at the distal end portion (lower end portion in FIG. 2) of the pin main portion 30, and an annular mounting groove (lower side) located on the distal end side of the ring groove 34. 35) (referred to as a mounting groove). Both the mounting grooves 33 and 35 are formed in the connecting pin 25 itself. The grease nipple 27 is attached to the upper end surface of the overhang pin portion 32.

  The pin main portion 30 is inserted into the pin hole 17 a at the tip of the upper tie rod 17, the pin hole 21 c at the tip of the knuckle arm 21 b of the steering knuckle 21, and the pin hole 17 a at the tip of the lower tie rod 17. Has been. In this state, the coupling pin 25 is prevented from coming off by attaching the snap ring 37 to the ring groove 34 of the pin main portion 30 by utilizing its elastic deformation. In this manner, the tie rods 17 and the steering knuckle 21 (specifically, the knuckle arm 21b) are rotatably connected via the connecting pin 25 on the knuckle side. The connecting pin 25 on the knuckle side corresponds to a “connecting pin” in this specification. Further, the tie rods 17 and the steering knuckle 21 correspond to “two members” in this specification.

Next, the cylinder boot will be described. 1 is a perspective view showing a rear axle to which a cylinder boot is attached, and FIG. 3 is a perspective view showing the cylinder boot.
As shown in FIGS. 1 and 3, the cylinder boot 40 includes an expandable / contracted bellows-shaped bellows tube portion 41, a cylindrical attachment base portion 42 formed at the base end portion of the bellows tube portion 41, and a bellows tube. And an extending portion 43 extending in the axial direction from the tip portion of the portion 41. The extending portion 43 is formed in a semi-cylindrical shape that opens one side (the back side in FIG. 1). A fitting portion 44 having a nipple insertion hole 45 corresponding to the grease nipple 27 attached to the upper end surface of the connecting pin 19 on the rod side is formed on the upper side portion of the base end portion of the extending portion 43 ( (See FIG. 3). 3 is a perspective view of the cylinder boot 40 in FIG. 1 as viewed from the back side of the drawing.

  The distal end portion of the extension portion 43 corresponds to the end portion on the movable side. As shown in FIG. 3, a pair of upper and lower mounting portions 46 that are parallel to each other are formed on both upper and lower sides of the distal end portion of the extending portion 43. Both mounting portions 46 correspond to the upper and lower end portions of the knuckle-side connecting pin 25, and circular mounting holes 47 corresponding to the upper and lower mounting grooves 33, 35 of the connecting pin 25 are formed. . An annular reinforcing patch 48 is joined to the hole edge of the mounting hole 47 on the outer surface side of both mounting portions 46 (see FIG. 2). The cylinder boot 40 (including the reinforcing patch 48) is formed of a material having flexibility and elasticity, such as a rubber material, a resin material, a resin-coated cloth material, or the like. The hole diameter d2 of the mounting hole 47 is set to be smaller than the pin outer diameter d1 of the connecting pin 25 on the knuckle side (see FIG. 2).

  Next, a procedure for attaching the cylinder boot 40 will be described. First, the mounting base 42 of the cylinder boot 40 is fitted into the cylinder housing 14 through the cylinder rod 15 of the power steering cylinder 13. In this state, the mounting base 42 is fastened and fixed to the cylinder housing 14 by the hose clamp 49 wound around the mounting base 42. Accordingly, the bellows cylinder portion 41 covers the periphery of the cylinder rod 15 of the power steering cylinder 13. This is the same as the conventional example (see FIG. 6).

  Subsequently, with the extended portion 43 of the cylinder boot 40 covering the rear side periphery of the tie rod 17, the mounting holes 47 of both mounting portions 46 are knuckled by utilizing the elastic deformation of the hole edge portions of the mounting holes 47. It fits in both mounting grooves 33 and 35 of the connecting pin 25 on the side (see FIG. 2). At this time, both mounting holes 47 are fitted in both mounting grooves 33 and 35 in a loosely fitting manner, so that both mounting portions 46 of the cylinder boot 40 are rotatably supported by the connecting pin 25. . The mounting hole 47 of the upper mounting portion 46 is fitted into the mounting groove 33 through the grease nipple 27 on the connecting pin 25 on the knuckle side. Further, the nipple insertion hole 45 (see FIG. 3) of the fitting portion 44 is fitted into the grease nipple 27 on the connecting pin 19 (see FIG. 5) on the rod side (see FIG. 1).

  In the cylinder boot 40 (see FIG. 1) that has been mounted in this manner, the extension portion 43 is pulled together with the connecting pin 25 on the knuckle side as the cylinder rod 15 of the power steering cylinder 13 is expanded and contracted. The bellows tube portion 41 extends. Further, as the cylinder rod 15 of the power steering cylinder 13 is shortened, the bellows tube portion 41 contracts by the extension portion 43 being pulled together with the connecting pin 25 on the knuckle side.

  According to the above-described mounting structure of the cylinder boot 40, the cylinder boot 40 is provided between the cylinder housing 14 and the connecting pin 25 on the knuckle side so as to cover the cylinder rod 15 and the like of the power steering cylinder 13 provided on the forklift. The extension portion 43 of the cylinder boot 40 is connected to the connecting pin 25 on the knuckle side that rotatably connects the tie rods 17 and the steering knuckle 21 (specifically, the knuckle arm 21b) of the movable member. The tip is supported. Therefore, the assembling property of the cylinder boot 40 can be improved by supporting the tip end portion of the extended portion 43 of the cylinder boot 40 on the knuckle-side connecting pin 25 without using a conventionally required winding member. it can.

  Moreover, the front-end | tip part of the extension part 43 of the cylinder boot 40 is supported by the both ends of the connection pin 25 by the side of a knuckle (refer FIG. 2). Therefore, it is possible to prevent or reduce the deformation of the distal end portion of the extending portion 43 of the cylinder boot 40 due to the water pressure of a high-pressure car wash or the like (for example, the expansion deformation in the vertical direction of both mounting portions 46). Further, the connecting portion between the tie rods 17 and the steering knuckle 21 (specifically, the knuckle arm 21 b) by the connecting pin 25 on the knuckle side can be covered with the distal end portion of the extending portion 43 of the cylinder boot 40.

  Further, the mounting holes 47 are provided in the both mounting portions 46 at the distal end portion of the extending portion 43 of the cylinder boot 40, and the annular mounting grooves 33 and 35 are provided in the connecting pin 25 on the knuckle side. 46 mounting holes 47 are fitted into the mounting grooves 33 and 35 of the connecting pin 25 on the knuckle side (see FIG. 2). Therefore, the distal end portion of the extending portion 43 of the cylinder boot 40 can be easily supported by the connecting pin 25 on the knuckle side.

  Further, mounting grooves 33 and 35 are formed in the connecting pin 25 itself on the knuckle side. Therefore, another member for forming the attachment grooves 33 and 35 in the connecting pin 25 on the knuckle side can be omitted.

  Further, an attachment base 42 which is an end portion on the fixed side of the cylinder boot 40 is attached to the cylinder housing 14 of the power steering cylinder 13 of the forklift, and at the knuckle side which rotatably connects the tie rod 17 and the steering knuckle 21. The connecting pin 25 supports the distal end portion of the extending portion 43 of the cylinder boot 40. Therefore, the assembling property of the cylinder boot 40 that covers the cylinder rod 15 and the tie rod 17 of the power steering cylinder 13 can be improved.

[Example 2]
A second embodiment of the present invention will be described. Since the present embodiment is obtained by changing a part of the first embodiment, the changed portion will be described, and redundant description will be omitted. FIG. 4 is a cross-sectional view showing a structure for attaching the cylinder boot to the knuckle-side connecting pin.
In this embodiment, as shown in FIG. 4, the overhanging pin portion 32 is omitted from the knuckle-side connecting pin 25 in the first embodiment (see FIG. 2), and the knuckle-side connecting pin 25 is separated from the following. An attachment groove (reference numeral 50) is formed instead of the attachment groove 33 by attaching the member. That is, as a separate member, a headed bolt 52 fastened to a screw hole 51 formed in the upper end surface 31a of the head 31 of the knuckle-side connecting pin 25 and a bolt shaft 52a of the bolt 52 are fitted. A washer 53 that forms a groove wall surface facing the upper end surface 31a of the head 31 of the connecting pin 25 on the knuckle side, and a spacer 54 that is fitted to the bolt shaft 52a of the bolt 52 and forms the annular groove bottom surface of the mounting groove 50. The mounting groove 50 is formed.

  If comprised in this way, the attachment groove | channel 50 is formed by attaching another member (The volt | bolt 52, the washer 53, the spacer 54) to the connection pin 25 by the side of a knuckle. Therefore, the attachment groove 50 can be easily formed by selectively attaching another member to the knuckle-side connecting pin 25 as necessary.

  As another member, a bolt 52 fastened to the upper end surface 31a of the head 31 of the knuckle-side connecting pin 25, and a head of the knuckle-side connecting pin 25 fitted to the bolt shaft 52a of the bolt 52. 31 is provided with a washer 53 that forms a groove wall surface that faces the upper end surface 31 a of 31, and a spacer 54 that is fitted to the bolt shaft 52 a of the bolt 52 and forms an annular groove bottom surface of the mounting groove 50. Therefore, the attachment groove 50 can be formed by attaching the washer 53 and the spacer 54 to the connecting pin 25 on the knuckle side with the bolt 52. In this case, commercially available products can be used as the bolts 52, washers 53, and spacers 54.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the present invention is not limited to a forklift, and can be applied to a mounting structure of a cylinder boot that covers a towing tractor, a power steering cylinder in other forklifts, a tilt cylinder, a cylinder rod of other cylinders, and the like. The cylinder is not limited to a hydraulic cylinder, and can be a pneumatic cylinder, an electric cylinder, or the like. Further, the cylinder is not limited to a double rod type, and may be a single rod type, and may be a single acting type or a double acting type. In the above embodiment, the base end portion (mounting base portion 42) of the cylinder boot 40 is attached to the cylinder housing 14. However, the base end portion of the cylinder boot 40 can be attached to the rear axle beam 11. In the above-described embodiment, both mounting portions 46 of the cylinder boot 40 are attached to both ends of the knuckle-side connecting pin 25, but one mounting portion of the cylinder boot 40 is attached to at least one end portion of the knuckle-side connecting pin 25. 46 may be supported. In this case, the other attachment portion and attachment groove can be omitted. Further, instead of the knuckle-side connecting pin 25, the rod-side connecting pin 19 may support the tip of the extending portion 43 of the cylinder boot 40. In the above embodiment, the mounting hole 47 of the mounting portion 46 of the cylinder boot 40 is fitted into the mounting grooves 33 (or 50) and 35 of the connecting pin 25 on the knuckle side. The tip can be supported on the knuckle-side connecting pin 25 by a bolt, clip, or the like. Further, by inserting the pin main portion 30 of the connecting pin 25 on the knuckle side into the mounting hole 47 of the mounting portion 46 in the cylinder boot 40, the mounting portion 46 of the cylinder boot 40 may be supported on the connecting pin 19 on the rod side. it can. Further, in the second embodiment, instead of attaching the washer 53 and the spacer 54 as separate members to the connecting pin 25 on the knuckle side with the bolt 52, another member with a groove provided with an attaching groove is used as the connecting pin 25 on the knuckle side. You may attach with attachment means, such as a screw. In the embodiment, the reinforcing patch 48 provided at the hole edge of the mounting hole 47 of the cylinder boot 40 may be omitted.

It is a perspective view which shows the rear axle which attached the cylinder boot which concerns on Example 1. FIG. It is sectional drawing which shows the attachment structure of the cylinder boot with respect to the connection pin by the side of a knuckle. It is a perspective view which shows a cylinder boot. FIG. 6 is a cross-sectional view illustrating a mounting structure of a cylinder boot with respect to a knuckle side connection pin according to a second embodiment. It is a perspective view which shows the rear axle of a forklift. It is a perspective view which shows the rear axle which attached the cylinder boot which concerns on a prior art example.

Explanation of symbols

10 Rear axle 11 Rear axle beam 13 Power steering cylinder 14 Cylinder housing (fixed side member)
15 Cylinder rod 17 Tie rod (one of two members)
19 Connecting pin on rod side 21 Steering knuckle (one of two members)
21b Knuckle arm 25 Connecting pin on the knuckle side (movable member)
30 Pin main portion 31 Head 32 Overhang pin portion 33 Upper mounting groove 35 Lower mounting groove 37 Snap ring 40 Cylinder boot 41 Bellows cylinder portion 42 Mounting base 43 Extension portion 46 Mounting portion 47 Mounting hole 50 Mounting groove 52 Bolt 53 Washer 54 Spacer

Claims (7)

A cylinder boot mounting structure in which a cylinder boot covering a cylinder rod or the like of a cylinder provided in an industrial vehicle is installed between a fixed member and a movable member,
A cylinder boot mounting structure characterized in that a movable pin end of the cylinder boot is supported by a connecting pin that rotatably connects two members of the movable member. The cylinder boot mounting structure according to claim 1,
The cylinder boot mounting structure, wherein the movable end of the cylinder boot is supported by both ends of the connecting pin. The cylinder boot mounting structure according to claim 1 or 2,
A cylinder boot characterized in that a mounting hole is provided at an end portion on the movable side of the cylinder boot, an annular mounting groove is provided in the connecting pin, and the mounting hole of the cylinder boot is fitted in the mounting groove of the connecting pin. Mounting structure. The cylinder boot mounting structure according to claim 3,
An attachment structure for a cylinder boot, wherein the attachment groove is formed in the connecting pin itself. The cylinder boot mounting structure according to claim 3,
A mounting structure for a cylinder boot, wherein the mounting groove is formed by mounting another member on the connecting pin. The cylinder boot mounting structure according to claim 5,
As the separate member, a bolt fastened to an end surface of the connecting pin, a washer fitted to the bolt shaft of the bolt and forming a groove wall surface facing the end surface of the connecting pin, and a bolt shaft of the bolt A cylinder boot mounting structure comprising: a spacer that is fitted and forms a groove bottom surface of the mounting groove. The cylinder boot mounting structure according to any one of claims 1 to 6,
The cylinder is a power steering cylinder that steers the steering wheel of the industrial vehicle;
The two members support a tie rod rotatably connected to a cylinder rod of the power steering cylinder via a rod-side connecting pin, and support the steering wheel and rotate to the tie rod via a knuckle-side connecting pin. A steering knuckle connected movably,
The cylinder boot mounting structure is characterized in that the fixed end of the cylinder boot is attached to the cylinder housing of the cylinder, and the movable end of the cylinder boot is supported by the connecting pin on the knuckle side. .

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