JP4874782B2 - Work vehicle - Google Patents

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JP4874782B2
JP4874782B2 JP2006343488A JP2006343488A JP4874782B2 JP 4874782 B2 JP4874782 B2 JP 4874782B2 JP 2006343488 A JP2006343488 A JP 2006343488A JP 2006343488 A JP2006343488 A JP 2006343488A JP 4874782 B2 JP4874782 B2 JP 4874782B2
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cylinder
hydraulic cylinder
cap
hydraulic
cylinder device
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JP2008155668A (en
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勝 安部
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Mitsubishi Agricultural Machinery Co Ltd
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Mitsubishi Agricultural Machinery Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle which enables compact constitution in a radial direction of a hydraulic cylinder device for automatic braking, sharing a part by enhancing applicability of the hydraulic cylinder device to various kinds of working vehicles, and attains reduction of cost of the hydraulic cylinder device itself as well as reduction of cost of the whole working vehicle. <P>SOLUTION: When a steering angle of a front wheel exceeds a predetermined angle, the hydraulic cylinder device in the working vehicle for operating a rear wheel brake at an inner side in a turning direction of left and right rear wheels, has: a cylinder 71 of the hydraulic cylinder devices 12, 13; a piston 81 fitted so as to be projected from one end of the cylinder 71 and capable of being interlocked with an operation system of the rear wheel brake; and a cap 91 attached to the cylinder 71 so as to close the other end of the cylinder 71. An adaptor 101 for feeding an oil pressure to a hydraulic chamber between the cylinder 71 and the piston 81 is fixed to the cap 91 coaxially to the cylinder 71. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

本発明は、前輪操舵角が所定角度を越えると、左右の後輪の内、旋回方向内側の後輪ブレーキを作動させるようにした、いわゆるオートブレーキを備えた作業用車輌に関する。   The present invention relates to a working vehicle equipped with a so-called autobrake that operates a rear wheel brake on the inner side in a turning direction among left and right rear wheels when a front wheel steering angle exceeds a predetermined angle.

トラクタ等の作業用車輌において、前輪の操舵角が所定の角度を越えると、左右の後輪の内、旋回方向内側の後輪に対応するオートブレーキ用の油圧シリンダ装置が作動して、旋回方向内側の後輪に制動力を作用させ、回転半径の小さい急旋回を行うようにした作業用車輌が知られている（例えば、特許文献１参照）。   In a working vehicle such as a tractor, when the steering angle of the front wheels exceeds a predetermined angle, the hydraulic cylinder device for auto brake corresponding to the rear wheels on the inner side in the turning direction is activated, and the turning direction is increased. There is known a working vehicle in which a braking force is applied to an inner rear wheel to make a sharp turn with a small turning radius (see, for example, Patent Document 1).

特開２００１−１８０４６６号公報（第２頁、図１）JP 2001-180466 A (2nd page, FIG. 1)

前記の作業用車輌においては、後輪ブレーキを作動する油圧シリンダ装置に対して油圧を供給するアダプタがシリンダの側面に接続されているため、オートブレーキ用の油圧シリンダ装置が径方向に大きくなり、その周囲に配置される各種部材との干渉を避けるために、該油圧シリンダ装置の各種作業用車輌への適用性を低下させ、作業車輌の車種毎に油圧シリンダ装置を変更しなければならず、油圧シリンダ装置自体のコストが高くなるだけでなく、作業用車輌全体のコストアップにもつながることになる。   In the above working vehicle, since an adapter for supplying hydraulic pressure to the hydraulic cylinder device that operates the rear wheel brake is connected to the side surface of the cylinder, the hydraulic cylinder device for autobrake becomes larger in the radial direction, In order to avoid interference with various members arranged around it, the applicability of the hydraulic cylinder device to various working vehicles must be reduced, and the hydraulic cylinder device must be changed for each type of working vehicle, This not only increases the cost of the hydraulic cylinder device itself, but also increases the cost of the entire working vehicle.

前記の事情にかんがみ、本発明は、オートブレーキ用の油圧シリンダ装置の径方向をコンパクトに構成でき、該油圧シリンダ装置の各種作業用車輌への適用性を高めて部品の共用化を可能とし、該油圧シリンダ装置自体のコストダウンと相俟って、作業用車輌全体のコストダウンを図ることができる作業用車輌を提供することを目的とする。   In view of the above circumstances, the present invention can be configured compactly in the radial direction of the hydraulic cylinder device for autobrake, making it possible to share parts by increasing the applicability of the hydraulic cylinder device to various working vehicles, An object of the present invention is to provide a working vehicle capable of reducing the cost of the entire working vehicle in combination with the cost reduction of the hydraulic cylinder device itself.

前記の目的を達成するため、本発明は、前輪（２、２）操舵角が所定角度を越えると、左右後輪（３、３）の内の旋回方向内側の後輪ブレーキを作動する油圧シリンダ装置（１２、１３）を備えた作業用車輌（１）において、
前記油圧シリンダ装置（１２、１３）は、機体に配設されたシリンダ（７１）と、該シリンダ（７１）の一端から突出するように嵌合して前記後輪ブレーキの操作系に連係し得るピストン（８１）と、該ピストンが挿入された大径の孔（７３）からなる前記シリンダ（７１）の他端を閉塞するように該シリンダ（７１）に装着されるキャップ（９１）と、前記シリンダ（７１）と前記ピストン（８１）との間の油圧室に油圧を供給するアダプタ（１０１）と、を有し、
前記アダプタ（１０１）は、前記キャップ（９１）に前記シリンダ（７１）と同一軸上で固定されてなる。 In order to achieve the above object , the present invention provides a hydraulic cylinder that operates a rear wheel brake inside the turning direction in the left and right rear wheels (3, 3) when the steering angle of the front wheels (2, 2) exceeds a predetermined angle. In the working vehicle (1) provided with the devices (12, 13),
The hydraulic cylinder device (12, 13) can be linked to a cylinder (71) disposed in the fuselage so as to protrude from one end of the cylinder (71) and linked to the operation system of the rear wheel brake. A piston (81), a cap (91) attached to the cylinder (71) so as to close the other end of the cylinder (71) comprising a large-diameter hole (73) into which the piston is inserted ; An adapter (101) for supplying hydraulic pressure to a hydraulic chamber between the cylinder (71) and the piston (81),
The adapter (101) is fixed to the cap (91) on the same axis as the cylinder (71) .

前記キャップ（９１）は、前記シリンダ（７１）の他端に抜け止めされて油密状に装着される大径の軸部（９２）と、前記シリンダ（７１）の外方における外周面に形成された２面取りからなる回り止め部（９４）とを有し、
前記キャップ（９１）に前記アダプタ（１０１）がネジ結合により取付け又は取外す際、前記キャップ（９１）を前記回り止め部（９４）にて回り止めしてなる。 Before Symbol cap (91), the axis of the large diameter is retained at the other end is attached to the oil-tight of the cylinder (71) and (92), the outer circumferential surface of the outside of the cylinder (71) a detent portion consisting of formed 2 chamfered and (94),
When the adapter (101) is attached to or removed from the cap (91) by screw connection, the cap (91) is prevented from being rotated by the rotation stopper (94) .

なお、前記した括弧内の符号等は、図面を参照するためのものであって、本発明を何ら限定するものではない。   The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

本発明によると、シリンダの他端を閉塞するキャップに、油圧供給用のアダプタがシリンダと同一軸で固定されるので、オートブレーキ用の油圧シリンダ装置をコンパクト、特に径方向にコンパクトに構成でき、該油圧シリンダ装置の各作業用車輌への適用性を高めて部品の共用化を可能とし、該油圧シリンダ装置自体のコストダウンと相俟って、作業用車輌全体のコストダウンを図ることができる。 According to the present invention, the cap for closing the other end of the cylinder, the adapter for the hydraulic supply is fixed in the same axis as the cylinder, can configure the hydraulic cylinder device for the automatic brake compact, compact in particular radially, The applicability of the hydraulic cylinder device to each work vehicle can be increased, and the parts can be shared. In combination with the cost reduction of the hydraulic cylinder device itself, the cost of the entire work vehicle can be reduced. .

更に、キャップにアダプタを取付け又は取外す際、回り止め部によりキャップの連れ回りを防止したので、アダプタをスパナ等で回転することにより容易かつ確実にキャップに取付け、取外しを行うことができる。 Further , when the adapter is attached to or removed from the cap, the rotation of the cap is prevented by the rotation preventing portion, so that the adapter can be easily and reliably attached to and removed from the cap by rotating with a spanner or the like.

以下、図面に基づき本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１乃至図６は、本発明の実施の形態を示すもので、図１は、トラクタの斜視図、図２は、オートブレーキ用の油圧シリンダ装置の配置を示す斜視図、図３は、トラクタの油圧系統図、図４は、オートブレーキ用の油圧シリンダ装置の取付け構造を示す斜視図、図５は、オートブレーキ用の油圧シリンダ装置の分解斜視図、図６は、オートブレーキ用の油圧シリンダ装置におけるシリンダを破断した状態で示す分解斜視図、図７は、オートブレーキ用の油圧シリンダ装置の他の取付け構造を示す斜視図である。   1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a tractor, FIG. 2 is a perspective view showing the arrangement of a hydraulic cylinder device for an autobrake, and FIG. 3 is a tractor. FIG. 4 is a perspective view showing a mounting structure of a hydraulic cylinder device for autobrake, FIG. 5 is an exploded perspective view of a hydraulic cylinder device for autobrake, and FIG. 6 is a hydraulic cylinder for autobrake. FIG. 7 is a perspective view showing another mounting structure of a hydraulic cylinder device for an autobrake. FIG.

図１に示すように、作業用車輌であるトラクタ１は、前輪２、２と後輪３（３）に支持されたミッションケースを含む機体５を有し、該機体５の前部にはエンジン（図示せず）が搭載され、ボンネット６で覆われている。前記機体５の中央上部には、運転席７が形成され、該運転席７には、ステアリング用のハンドル８と座席１０が配設されている。また、前記トラクタ１の後部には、ロータリなどの作業機１５が連結されている。   As shown in FIG. 1, a tractor 1 as a working vehicle has a body 5 including a transmission case supported by front wheels 2, 2 and a rear wheel 3 (3). (Not shown) is mounted and covered with a hood 6. A driver's seat 7 is formed at the upper center of the body 5, and a steering handle 8 and a seat 10 are disposed in the driver's seat 7. A work machine 15 such as a rotary is connected to the rear portion of the tractor 1.

図２に示すように、前記機体５の前方の左右両側面には、それぞれ前記前輪２、２のブレーキ装置（図示せず）を作動させるためのレバー１１（１１）と対向するようにオートブレーキ用の油圧シリンダ装置１２、１３が配置されている。   As shown in FIG. 2, on both the left and right front sides of the front of the airframe 5, an auto brake is provided so as to face a lever 11 (11) for operating a brake device (not shown) for the front wheels 2 and 2, respectively. Hydraulic cylinder devices 12 and 13 are arranged.

図３に示すように、前記トラクタ１の油圧系統２０は、オイルタンクを兼ねる機体（ミッションケース）５に、フィルタ２１を介して油圧リフト用のポンプ２２とパワーステアリング用のポンプ２３が接続されている。   As shown in FIG. 3, the hydraulic system 20 of the tractor 1 has a hydraulic lift pump 22 and a power steering pump 23 connected to a machine body (mission case) 5 also serving as an oil tank via a filter 21. Yes.

前記油圧リフト用のポンプ２２には、油圧取出しブロック２５、フィルタ２７及び分流弁２８を介して、昇降制御系３０と傾斜制御系４０が接続されている。前記油圧取出しブロック２５には、ポンプポートP、タンクポートＴ及びニュートラルポートＮが形成され、かつ内部にリリーフ弁２６が配設され、前記ポンプポートＰ、タンクポートＴ及びニュートラルポートＮを介して、機外への油圧の取出しができるようになっている。   A lift control system 30 and an inclination control system 40 are connected to the hydraulic lift pump 22 via a hydraulic take-out block 25, a filter 27 and a flow dividing valve 28. A pump port P, a tank port T, and a neutral port N are formed in the hydraulic pressure take-out block 25, and a relief valve 26 is disposed therein, and through the pump port P, the tank port T, and the neutral port N, The hydraulic pressure can be taken out of the machine.

前記昇降制御系３０は、リリーフ弁３１、電磁比例切換え弁３２、上げ側主弁３３、電磁比例切換え弁３５及び下げ側主弁３６等を有し、前記作業機１５を昇降移動させる油圧シリンダ装置３７の駆動を制御するようになっている。   The lifting control system 30 includes a relief valve 31, an electromagnetic proportional switching valve 32, a raising main valve 33, an electromagnetic proportional switching valve 35, a lowering main valve 36, and the like, and a hydraulic cylinder device that moves the working machine 15 up and down. The drive of 37 is controlled.

前記傾斜制御系４０は、パイロットチェック弁４１、チェック弁４２、絞り弁４３及び電磁切換え弁４５等を有し、前記作業機１５の傾斜を制御する油圧シリンダ装置４６の駆動を制御するようになっている。   The tilt control system 40 includes a pilot check valve 41, a check valve 42, a throttle valve 43, an electromagnetic switching valve 45, and the like, and controls the drive of a hydraulic cylinder device 46 that controls the tilt of the work implement 15. ing.

前記パワーステアリング用のポンプ２３には、前輪操舵系５０とオートブレーキターン系６０が接続されている。前記前輪操舵系は、リリーフ弁５１と、チェック弁５２と、操舵方向切換え用の油圧切換え弁５３及び油圧シリンダ装置５５等を有し、前記ハンドル８の操作により前記電磁切換え弁５３を切換えて、前記油圧シリンダ装置５５の作動方向、即ち前輪２の操舵方向を切換えるようになっている。   A front wheel steering system 50 and an autobrake turn system 60 are connected to the power steering pump 23. The front wheel steering system includes a relief valve 51, a check valve 52, a hydraulic switching valve 53 for switching the steering direction, a hydraulic cylinder device 55, and the like. The electromagnetic switching valve 53 is switched by operating the handle 8, The operating direction of the hydraulic cylinder device 55, that is, the steering direction of the front wheel 2 is switched.

前記オートブレーキターン系６０は、リリーフ弁６１と、前輪増速クラッチ６２用の油圧切換え弁６３及び電磁切換え弁６５等を有し、前記電磁切換え弁６５に前記オートブレーキ用の油圧シリンダ装置１２、１３が接続されている。そして、前記ハンドル８の操作角度が一定の操作角度（例えば４０度）を越えると、前記電磁切換え弁６５が作動して、トラクタ１の旋回方向内側の後輪ブレーキに対応する前記油圧シリンダ装置１２（又は油圧シリンダ装置１３）を作動させる。   The auto brake turn system 60 includes a relief valve 61, a hydraulic pressure switching valve 63 for the front wheel speed increasing clutch 62, an electromagnetic switching valve 65, and the like. The electromagnetic switching valve 65 includes the hydraulic cylinder device 12 for auto braking, 13 is connected. When the operation angle of the handle 8 exceeds a certain operation angle (for example, 40 degrees), the electromagnetic switching valve 65 is activated, and the hydraulic cylinder device 12 corresponding to the rear wheel brake inside the turning direction of the tractor 1 is operated. (Or hydraulic cylinder device 13) is operated.

図４乃至図７に示すように、前記油圧シリンダ装置１２（１３）は、ブラケット６７を介して前記機体５に側面にネジ６８で固定されている。前記油圧シリンダ装置１２（１３）は、両端開口形のシリンダ７１と、該シリンダ７１内に往復移動自在に配置されたピストン８１と、前記シリンダ７１の後端に装着され、その後端にアダプタ１０１を接続して油圧を供給するためのキャップ９１とを備えている。   As shown in FIGS. 4 to 7, the hydraulic cylinder device 12 (13) is fixed to a side surface of the machine body 5 with a screw 68 via a bracket 67. The hydraulic cylinder device 12 (13) is attached to a cylinder 71 having an opening at both ends, a piston 81 disposed in a reciprocating manner in the cylinder 71, and a rear end of the cylinder 71, and an adapter 101 at the rear end. And a cap 91 for connecting and supplying hydraulic pressure.

前記シリンダ７１には、先端側に小径の孔７２、後端側に大径の孔７３が貫通するように形成され、その先端部内周面にダストシール７５とＯリング７６が配置されている。また、前記孔７２と孔７３の段差部には、ばね受７７が配置され、後端部には、環状の溝７８が形成されている。   The cylinder 71 is formed with a small-diameter hole 72 on the front end side and a large-diameter hole 73 on the rear end side, and a dust seal 75 and an O-ring 76 are disposed on the inner peripheral surface of the front end portion. A spring receiver 77 is disposed at the step between the hole 72 and the hole 73, and an annular groove 78 is formed at the rear end.

前記ピストン８１は、先端側が前記ダストシール７５及びOリング７６を摺動可能に貫通し、前記シリンダ７１の先端から突出する大径の軸部８２と、後端側が前記ばね受７７を移動自在に貫通する小径の軸部８３が形成され、該小径の軸部８３の後端には、前記シリンダ７１の大径の孔７３に摺動自在に嵌合し、油圧を受ける受圧部材と前記ばね受７７と対向するばね受けを兼ねるフランジ８５がネジ８６で固定されている。そして、前記ばね受７７とフランジ８５の間には、戻しスプリング８８が装着され、前記ピストン８１を後方に向けて押し戻すように付勢している。   The piston 81 slidably penetrates the dust seal 75 and the O-ring 76 on the front end side, and has a large-diameter shaft portion 82 projecting from the front end of the cylinder 71 and the rear end side movably penetrates the spring receiver 77. A small-diameter shaft portion 83 is formed, and at the rear end of the small-diameter shaft portion 83 is slidably fitted into a large-diameter hole 73 of the cylinder 71 and receives the hydraulic pressure and the spring receiver 77. A flange 85 that also serves as a spring receiver is fixed with a screw 86. A return spring 88 is mounted between the spring receiver 77 and the flange 85 and urges the piston 81 to push back backward.

前記キャップ９１は、前記シリンダ７１の後端に嵌合する大径の軸部９２と、回り止め部９４となる２面取りが形成された小径の軸部９３を有し、前記軸部９２、９３の軸心には、油圧の供給、排出を行うための貫通孔９５が形成されている。また、前記軸部９２の先端側端面には、前記貫通孔９５から径方向に延びる溝９６が形成され、前記ネジ８６が前記軸部９２の先端面に接触しても、該溝９６を介して油圧の供給を可能にしている。前記キャップ９１の軸部９２には、Oリング９７とダストシール９８が装着されている。   The cap 91 has a large-diameter shaft portion 92 fitted to the rear end of the cylinder 71, and a small-diameter shaft portion 93 formed with two chamfers serving as a rotation preventing portion 94. The shaft portions 92, 93 A through hole 95 for supplying and discharging hydraulic pressure is formed in the shaft center. Further, a groove 96 extending in the radial direction from the through hole 95 is formed on the end surface on the front end side of the shaft portion 92, and even if the screw 86 contacts the front end surface of the shaft portion 92, the groove 96 passes through the groove 96. This makes it possible to supply hydraulic pressure. An O-ring 97 and a dust seal 98 are attached to the shaft portion 92 of the cap 91.

前記キャップ９１は、前記シリンダ７１の後端部に装着された後、前記シリンダ７１の後端部に形成された溝７８に嵌合するCリング１００で抜け止めされる。また、前記軸部９３の後端には、前記油圧系統の切換え弁６５に接続されたアダプタ１０１がネジ結合により接続される。即ち、前記アダプタ１０１は、前記キャップ９１の後端に前記シリンダ７１と同一軸上に接続することができる。   After the cap 91 is attached to the rear end portion of the cylinder 71, the cap 91 is prevented from coming off by a C-ring 100 fitted in a groove 78 formed in the rear end portion of the cylinder 71. An adapter 101 connected to the switching valve 65 of the hydraulic system is connected to the rear end of the shaft portion 93 by screw coupling. That is, the adapter 101 can be connected to the rear end of the cap 91 on the same axis as the cylinder 71.

この時、図７に示すように、前記ブラッケット６７に一体に固定されるプレート１０５に形成されたU字状の溝１０６で、前記キャップ９１の軸部９３に形成された回り止め部９４（２面取り）を拘束することにより、アダプタ１０１をネジ結合する際に、前記キャップ９１の連れ回りを防止することができる。また、上記プレート１０５の溝１０６に２面取り９４を嵌挿して、回り止めを図った場合でも、２面取り９４の軸方向長さは、スパナをかける余裕がある長さからなり、スパナにより回り止めをすることも可能である。   At this time, as shown in FIG. 7, the U-shaped groove 106 formed in the plate 105 integrally fixed to the bracket 67 is used to prevent the rotation prevention portion 94 (2) formed in the shaft portion 93 of the cap 91. By restraining chamfering, the cap 91 can be prevented from being rotated when the adapter 101 is screwed. Further, even when a double chamfer 94 is inserted into the groove 106 of the plate 105 to prevent rotation, the axial direction length of the two chamfer 94 is a length that allows a spanner to be applied. It is also possible to do.

前記のように、前記油圧シリンダ装置１２（１３）を構成する前記シリンダ７１の一端を閉塞する前記キャップ９１に、油圧供給用の前記アダプタ１０１が、前記シリンダと同一軸で固定されるので、オートブレーキ用の前記油圧シリンダ装置１２（１３）の径方向をコンパクトに構成でき、該油圧シリンダ装置１２（１３）の各種の作業用車輌への適用性を高めることができる。よって部品の共用化を可能とし、前記油圧シリンダ装置１２（１３）自体のコストダウンと相俟って、トラクタ１（作業用車輌）全体のコストダウンを図ることができる。   As described above, since the adapter 101 for supplying hydraulic pressure is fixed to the cap 91 that closes one end of the cylinder 71 constituting the hydraulic cylinder device 12 (13) on the same axis as the cylinder, The radial direction of the hydraulic cylinder device 12 (13) for braking can be made compact, and the applicability of the hydraulic cylinder device 12 (13) to various working vehicles can be enhanced. Therefore, the parts can be shared, and the cost of the entire tractor 1 (work vehicle) can be reduced in combination with the cost reduction of the hydraulic cylinder device 12 (13) itself.

トラクタの斜視図である。It is a perspective view of a tractor. オートブレーキ用の油圧シリンダ装置の配置を示す斜視図である。It is a perspective view which shows arrangement | positioning of the hydraulic cylinder apparatus for autobrakes. トラクタの油圧系統図である。It is a hydraulic system figure of a tractor. オートブレーキ用の油圧シリンダ装置の取付け構造を示す斜視図である。It is a perspective view which shows the attachment structure of the hydraulic cylinder apparatus for autobrakes. オートブレーキ用の油圧シリンダ装置の分解斜視図である。It is a disassembled perspective view of the hydraulic cylinder apparatus for autobrakes. オートブレーキ用の油圧シリンダ装置におけるシリンダを破断した状態で示す分解斜視図である。It is a disassembled perspective view in the state which fractured | ruptured the cylinder in the hydraulic cylinder apparatus for autobrakes. オートブレーキ用の油圧シリンダ装置の他の取付け構造を示す斜視図である。It is a perspective view which shows the other attachment structure of the hydraulic cylinder apparatus for autobrakes.

符号の説明Explanation of symbols

１ 作業用車輌（トラクタ）
２ 前輪
３ 後輪
５ 機体
１２ 油圧シリンダ装置
１３ 油圧シリンダ装置
７１ シリンダ
８１ ピストン
９１ キャップ
９４ 回り止め部
１０１ アダプタ 1 Work vehicle (tractor)
2 Front wheel 3 Rear wheel 5 Airframe 12 Hydraulic cylinder device 13 Hydraulic cylinder device 71 Cylinder 81 Piston 91 Cap 94 Non-rotating portion 101 Adapter

Claims (1)

前輪操舵角が所定角度を越えると、左右後輪の内の旋回方向内側の後輪ブレーキを作動する油圧シリンダ装置を備えた作業用車輌において、
前記油圧シリンダ装置は、機体に配設されたシリンダと、該シリンダの一端から突出するように嵌合して前記後輪ブレーキの操作系に連係し得るピストンと、該ピストンが挿入された大径の孔からなる前記シリンダの他端を閉塞するように該シリンダに装着されるキャップと、前記シリンダと前記ピストンとの間の油圧室に油圧を供給するアダプタと、を有し、
前記アダプタは、前記キャップに前記シリンダと同一軸上で固定され、
前記キャップは、前記シリンダの他端に抜け止めされて油密状に装着される大径の軸部と、前記シリンダの外方における外周面に形成された２面取りからなる回り止め部とを有し、
前記キャップに前記アダプタがネジ結合により取付け又は取外す際、前記キャップを前記回り止め部にて回り止めしてなる、
ことを特徴とする作業用車輌。 When the front wheel steering angle exceeds a predetermined angle, in a working vehicle equipped with a hydraulic cylinder device that operates a rear wheel brake inside the turning direction of the left and right rear wheels,
The hydraulic cylinder device includes a cylinder disposed in the airframe, a piston that can be fitted so as to protrude from one end of the cylinder, and can be linked to the operation system of the rear wheel brake, and a large diameter into which the piston is inserted. A cap that is attached to the cylinder so as to close the other end of the cylinder, and an adapter that supplies hydraulic pressure to a hydraulic chamber between the cylinder and the piston,
The adapter is fixed to the cap on the same axis as the cylinder ;
The cap has a large-diameter shaft portion that is secured to the other end of the cylinder so as to be oil-tight, and a rotation-preventing portion that is formed by two chamfers formed on the outer circumferential surface of the cylinder. And
When the adapter is attached to or removed from the cap by screw connection, the cap is prevented from being rotated by the detent portion.
A working vehicle characterized by that.
JP2006343488A 2006-12-20 2006-12-20 Work vehicle Expired - Fee Related JP4874782B2 (en)

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JP6435155B2 (en) * 2014-10-15 2018-12-05 ヤンマー株式会社 Tractor

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JP2557890Y2 (en) * 1992-02-04 1997-12-17 埼玉機器株式会社 Clutch master cylinder
JP4188527B2 (en) * 1999-12-24 2008-11-26 三菱農機株式会社 Working vehicle
JP2003081588A (en) * 2001-09-10 2003-03-19 Nissan Motor Co Ltd Reach type forklift brake device

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