JPH0650671Y2 - Work vehicle braking system - Google Patents
Work vehicle braking systemInfo
- Publication number
- JPH0650671Y2 JPH0650671Y2 JP1989019109U JP1910989U JPH0650671Y2 JP H0650671 Y2 JPH0650671 Y2 JP H0650671Y2 JP 1989019109 U JP1989019109 U JP 1989019109U JP 1910989 U JP1910989 U JP 1910989U JP H0650671 Y2 JPH0650671 Y2 JP H0650671Y2
- Authority
- JP
- Japan
- Prior art keywords
- braking
- piston
- spring
- friction plate
- force
- 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.)
- Expired - Fee Related
Links
Landscapes
- Braking Arrangements (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、圧油供給時には、バネの付勢力に抗してピス
トンを制動解除方向に作動させ、排油時には、バネの付
勢力により摩擦板を圧接する制動方向に向けてピストン
を作動させて摩擦板と伝動連結する走行用の伝動軸に制
動力を作用させる作業車の制動装置に関し、詳しくは、
排油時において制動力を解除するための技術に関するも
のである。[Detailed Description of the Invention] [Industrial field of application] The present invention operates the piston in the braking release direction against the biasing force of the spring when pressure oil is supplied, and when the oil is drained, friction is generated by the biasing force of the spring. A braking device for a work vehicle, which operates a piston in a braking direction in which a plate is pressed to apply a braking force to a traveling transmission shaft that is transmission-coupled to a friction plate,
The present invention relates to a technique for releasing a braking force when oil is drained.
上記の如く構成された制動装置は、通常、エンジン動力
で駆動される油圧ポンプからの圧油を、そのピストンに
供給するよう系を形成することでエンジンの停止時には
バネの付勢力により必ず制動力を得るよう、作業者の走
行系等に設けられるものである。The braking device configured as described above normally forms a system to supply pressure oil from a hydraulic pump driven by engine power to its piston, so that when the engine is stopped, the braking force is always generated by the spring biasing force. It is provided in the traveling system of the worker so as to obtain
そして、この種の制動装置ではエンジンの故障時等にお
いて、この制動装置の制動力を解除するための機構を備
えるものも存在する(例えば実開昭63-76573号公報)。Some braking devices of this type include a mechanism for releasing the braking force of the braking device when the engine is out of order (for example, Japanese Utility Model Laid-Open No. 63-76573).
尚、この従来例では、ピストンを制動方向に向けて付勢
するバネの反力点を後退させることでピストンに作用す
る付勢力の解除を行う機構が備えられている。In this prior art example, a mechanism is provided for releasing the biasing force acting on the piston by retracting the reaction force point of the spring that biases the piston in the braking direction.
前記従来例ではバネの付勢力を解除する構造であるた
め、排油状態においてバネ付勢力を完全に解除しようと
すれば、ピストンが摩擦板を圧接しないよう設定したピ
ストンの位置を基準にして(このピストンの位置では制
動状態より、更にバネが圧縮される)、バネが自然長に
達する位置まで反力側の部材を移動させねばならず、こ
の機構の操作ストロークが大きくなるばかりでなく、こ
の機構の大型化に繋がることもある。Since the conventional example has a structure for releasing the spring biasing force, if the spring biasing force is to be completely released in the oil draining state, the piston is set so as not to press the friction plate against the piston position as a reference ( At this piston position, the spring is further compressed than in the braking state), and the member on the reaction force side must be moved to a position where the spring reaches the natural length, which not only increases the operation stroke of this mechanism, but also It may lead to an increase in the size of the mechanism.
又、この従来例の機構では、バネの付勢力を単に解除す
るだけなので、例えば、ピストンの作動不良等によりピ
ストンが制動位置から移動できないという故障を生じた
場合には、制動力の解除を行えないこともある。Further, in the mechanism of this conventional example, since the urging force of the spring is simply released, the braking force can be released when a failure occurs such that the piston cannot move from the braking position due to a malfunction of the piston or the like. Sometimes it doesn't.
本考案の目的は、制動装置のピストンに故障を生ずるこ
とがあっても確実に制動力の解除を行える機構を、でき
るだけ小型に構成する点にある。An object of the present invention is to make the mechanism that can reliably release the braking force as small as possible even if the piston of the braking device is damaged.
本考案の特徴は圧油供給時には、バネの付勢力に抗して
ピストンを制動解除方向に作動させ、排油時には、バネ
の付勢力により摩擦板を圧接する制動方向に向けてピス
トンを作動させて摩擦板と伝動連結する走行用の伝動軸
に制動力を作用させる作業車の制動装置であって、前記
伝動軸の軸芯に沿う方向で該伝動軸に動力を伝える伝動
ケースの側に前記バネを配置し、圧油供給により前記ピ
ストンが非制動位置にある状態で前記摩擦板を制動操作
する人為操作用のピストンを前記摩擦板を挟んで前記バ
ネと対向する側に配置し、前記ピストンを制動解除方向
に作動させるための油室を貫通してピストンの押圧操作
を行う制動力解除用のロッドを備え、このロッドの反ピ
ストン側に接当して、螺進によりこのロッドに押圧力を
作用させるネジ材を、該制動装置のケーシングの反伝動
ケース側に備え、かつ、このロッドの挿通する部位にオ
イルシールを備えて成る点にあり、その作用、及び、効
果は次の通りである。The feature of the present invention is that when the pressure oil is supplied, the piston is actuated in the braking release direction against the biasing force of the spring, and when the oil is drained, the piston is actuated in the braking direction in which the friction plate is pressed by the biasing force of the spring. A braking device for a working vehicle that applies a braking force to a traveling transmission shaft that is transmission-coupled to a friction plate, wherein the transmission case transmits power to the transmission shaft in a direction along an axis of the transmission shaft. A piston is provided for arranging a spring, and a piston for manual operation for braking the friction plate in a state where the piston is in a non-braking position by supplying pressure oil is arranged on a side facing the spring with the friction plate interposed therebetween. Is equipped with a rod for releasing the braking force that penetrates the oil chamber to operate the piston in the braking release direction and presses the piston.The rod contacts the opposite piston side and pushes against this rod by screwing. Screw material Comprises a counter-transmission case side of the casing of the braking device, and, located in the site of insertion of the rod to the point comprising an oil seal, its action and effects are as follows.
上記特徴によると、排油状態で制動力の解除を行う場合
には、ネジ材を回動操作することにより、このネジ材の
螺進力がロッドを介してピストンに伝えられ、このピス
トンはロッドからの押圧力により制動力解除方向に移動
するものとなる。又、圧油供給状態で制動を行う場合に
は人為作用のピストンを操作することにより、摩擦板を
制動方向に操作できるものとなる。According to the above feature, when the braking force is released in the oil draining state, the screw member is rotated to transmit the screwing force of the screw member to the piston through the rod, and the piston is connected to the rod. It is moved in the braking force releasing direction by the pressing force from. Further, when braking is performed in the pressure oil supply state, the friction plate can be operated in the braking direction by operating the artificial piston.
つまり、前記従来例のようにバネの付勢力を解除する方
向に操作するのでは無く、バネの付勢力に抗して螺進力
によりピストンを移動操作するので、例えば、ピストン
に作動不良を生じていても、比較的強力な螺進力で制動
力の解除を行え、又、この解除に要するネジの螺進スト
ロークも、プストンを摩擦板から離間させる程度なの
で、小さくできるものとなり、しかも、ロッドが油室を
貫通する位置に備えられるにも拘らず、オイルシールに
よって作動油のリークを防止できるものとなる。そし
て、圧油供給状態での制動を行う場合にも特別に制動用
の摩擦板を備えずとも摩擦板を兼用することが可能とな
る。That is, instead of operating the spring in the direction of releasing the biasing force as in the conventional example, the piston is moved and operated by the screwing force against the biasing force of the spring. However, the braking force can be released by a relatively strong screwing force, and the screwing stroke of the screw required for this release can be made smaller because the pushstone is separated from the friction plate. Despite being provided at a position penetrating the oil chamber, the oil seal can prevent leakage of hydraulic oil. Further, even when braking is performed in the pressure oil supply state, it is possible to serve as a friction plate without specially providing a friction plate for braking.
更に、バネを伝動ケースの側に配置し、ネジ材を制動装
置のケーシングを挟んで伝動ケースと対向する側に配置
しているので、ピストンに付勢力を作用させるバネの受
け側の部材に伝動ケースを利用することも可能となり、
又、このネジ材を操作する際にも、工具類が伝動ケース
に接触する等の不都合を生ずること無く伝動ケースから
離間した広い空間を利用して制動力の解除操作を行える
ものとなる。Further, since the spring is arranged on the side of the transmission case and the screw member is arranged on the side facing the transmission case with the casing of the braking device interposed therebetween, it is transmitted to the member on the receiving side of the spring which applies the urging force to the piston. It is also possible to use the case,
Also, when the screw member is operated, the releasing operation of the braking force can be performed by utilizing the wide space separated from the transmission case without causing any inconvenience such as the tools coming into contact with the transmission case.
従って、制動装置のピストンに故障を生ずることがあっ
ても楽な操作で確実に制動力の解除を行える機構が部品
数を増大させず小型に、かつ、作動油にリークを生じ難
い状態に構成できたのである。Therefore, even if the piston of the braking device may break down, the mechanism that can reliably release the braking force by an easy operation is small in size without increasing the number of parts and is in a state in which hydraulic fluid does not easily leak. I was able to do it.
特に、本考案では摩擦板の兼用で作業時、走行時等、油
室に圧油が供給される状態でも人為操作による制動も可
能で、しかも、ピストンを押圧操作するための部材がロ
ッドとネジ材との2部材で成り、しかも、オイルシール
が用いられているため、ネジ材に通常のボルト等を用い
ても、作動油のリークを防止できるという効果も生ず
る。In particular, in the present invention, the friction plate can also be used for braking by manual operation even when pressure oil is supplied to the oil chamber during work, traveling, etc., and the member for pressing the piston is the rod and screw. Since it is made up of two members, and an oil seal is used, the effect of preventing leakage of hydraulic oil can be obtained even if a normal bolt or the like is used for the screw material.
以下、本考案の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第3図に示すように、左右一対の駆動前車輪(1)を有
する前部車体(2)と、左右一対の駆動後車輪(3)を
有する後部車体(4)とを縦向き軸芯(Y)周りで揺動
自在に連結し、前部、後部車体(2),(4)夫々の間
にステアリングシリンダ(5)を設けて走行車体を構成
すると共に、前部車体(2)に、左右一対のアーム
(6)によって昇降自在に支持されるショベル(7)、
及び、これらを駆動するリフトシリンダ(8)、チルト
シリンダ(9)を設け、又、後部車体(4)にエンジン
(10)、運転座席(11)、ステアリングハンドル(1
2)、前後の車輪(1),(3)夫々の動力を伝える駆
動系を設けてホイールローダを構成する。As shown in FIG. 3, a front vehicle body (2) having a pair of left and right driving front wheels (1) and a rear vehicle body (4) having a pair of left and right driving rear wheels (3) are provided with a longitudinal axis ( Y) swingably connected, and a steering cylinder (5) is provided between each of the front and rear vehicle bodies (2) and (4) to form a traveling vehicle body. An excavator (7) supported by a pair of left and right arms (6) so as to be able to move up and down,
Further, a lift cylinder (8) and a tilt cylinder (9) for driving them are provided, and an engine (10), a driver's seat (11), a steering wheel (1) are provided on the rear body (4).
2), a wheel loader is configured by providing a drive system that transmits the power of each of the front and rear wheels (1) and (3).
このホイールローダでは第1図乃至第3図に示すよう
に、前記エンジン(10)からに動力が伝えられる可変容
量型の油圧ポンプ(13)と、この油圧ポンプ(13)から
の圧油で駆動される油圧モータ(14)とで成る無段変速
系を備え、この油圧モータ(14)からの動力は略縦長姿
勢に設けられた伝動ケース(15)に伝えられると共に、
この伝動ケース(15)の下部位置に設けられた走行用の
伝動軸としての出力軸(16)を介して後車輪(3)の差
動装置(3a)、及び、中間軸(17)を更に介して前車輪
(1)の差動装置(1a)夫々に伝えられる。In this wheel loader, as shown in FIGS. 1 to 3, a variable displacement hydraulic pump (13) to which power is transmitted from the engine (10) and pressure oil from the hydraulic pump (13) are used for driving. The hydraulic motor (14) is provided with a continuously variable transmission system, and the power from the hydraulic motor (14) is transmitted to the transmission case (15) provided in a substantially vertical position.
The differential device (3a) of the rear wheel (3) and the intermediate shaft (17) are further connected via an output shaft (16) as a transmission shaft for traveling provided at a lower position of the transmission case (15). It is transmitted to each differential device (1a) of the front wheel (1) via the.
又、前記伝動ケース(15)には3つのギヤ(18)‥が内
装され、この伝動ケース(15)の下部には前記出力軸
(16)が貫通する状態に制動装置(B)が取付けられて
いる。Further, the transmission case (15) is internally provided with three gears (18), and a braking device (B) is attached to a lower portion of the transmission case (15) in a state where the output shaft (16) penetrates. ing.
即ち、この制動装置(B)は、伝動ケース(15)にボル
ト(19)で連結されるケーシング(20)と、このケーシ
ング(20)及び出力軸(16)夫々に係合支持される多数
の摩擦板(21)‥、バネ(22)の付勢力によって摩擦板
(21)‥を制動方向に押圧するピストン(23)、人為操
作用のリング状ピストン(24)夫々を有して成り、前記
ピストン(23)はケーシング(20)との間に形成される
油室(R)に対してエンジン(10)で駆動される油圧ポ
ンプ(25)からの圧油が供給されることにより、エンジ
ン(10)の稼動時には制動力の解除が行われ、又、この
制動力の解除時において、車体のフートペダル(26)の
操作により、マスタシリンダ(27)からの圧力を前記リ
ング状ピストン(24)に作用させて制動を行えるように
も構成されている。That is, the braking device (B) is provided with a casing (20) connected to the transmission case (15) with bolts (19), and a large number of engaging and supported by the casing (20) and the output shaft (16). The friction plate (21), the piston (23) for pressing the friction plate (21) in the braking direction by the urging force of the spring (22), and the ring-shaped piston (24) for manual operation. The piston (23) is supplied with pressure oil from a hydraulic pump (25) driven by the engine (10) to an oil chamber (R) formed between the piston (23) and the engine ( When the braking force is released during operation of 10), the pressure from the master cylinder (27) is applied to the ring-shaped piston (24) by operating the foot pedal (26) of the vehicle body when releasing the braking force. It is also configured so that it can be actuated to perform braking.
尚、バネ(22)は伝動ケース(15)に形成された凹部に
嵌込み状態に備えられ、摩擦板(21)‥を挟んでバネ
(22)で押圧操作されるピストン(23)と対向する位置
にリング状ピストン(24)が配置されている。The spring (22) is fitted in a recess formed in the transmission case (15) and faces the piston (23) which is pressed by the spring (22) with the friction plates (21) sandwiched therebetween. The ring-shaped piston (24) is arranged at the position.
更に、この制動装置(B)では、エンジン(10)が故障
した際等、前記油室(R)に圧油を供給できない場合で
も制動状態を解除するため、油室(R)を貫通するロッ
ド(28)と、このロッド(28)の反ピストン側に押圧力
を作用させるネジ材(29)がケーシング(20)の反伝動
ケース側の2箇所に設けられ、このロッド(28)にはオ
イルシール(30)が設けられ、ネジ材(29)にはワッシ
ャ(31)が嵌め込まれている。Further, in this braking device (B), the rod that penetrates the oil chamber (R) is released in order to release the braking state even when pressure oil cannot be supplied to the oil chamber (R), such as when the engine (10) fails. (28) and a screw member (29) for exerting a pressing force on the side opposite to the piston of the rod (28) are provided at two locations on the side opposite to the transmission case of the casing (20). A seal (30) is provided, and a washer (31) is fitted in the screw material (29).
そして、制動状態を解除する場合には、ワッシャ(31)
を取外し、ネジ材(29)の頭部(29a)がケーシング(2
0)に接するまでネジ材(29)を螺進操作することによ
り、ロッド(28)がピストン(23)を摩擦板(21)‥と
離間する位置まで移動させるようになっている。Then, when releasing the braking state, the washer (31)
Remove the head (29a) of the screw material (29) from the casing (2
The rod (28) moves the piston (23) to a position separated from the friction plates (21) by screwing the screw member (29) until it comes into contact with the friction plate (21).
本考案は上記実施例以外に例えば、ケーシングの側のロ
ッド挿通孔に溝を形成してロッド挿通部のオイルシール
を設けて良く、又、人為操作用のピストンを備えない構
造の制動装置に適用する等、様々に実施可能である。In addition to the above embodiment, the present invention may be applied to a braking device having a structure in which a groove is formed in the rod insertion hole on the casing side to provide an oil seal for the rod insertion portion, and a piston for manual operation is not provided. It can be implemented in various ways.
尚、実用新案登録請求の範囲の項に図面との対照を便利
にする為に符号を記すが、該記入により本考案は添付図
面の構造に限定されるものではない。It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.
図面は本考案に係る作業車の制動装置の実施例を示し、
第1図は伝動ケースの断面図、第2図はホイルローダの
概略背面図、第3図はホイルローダの全体側面図であ
る。 (15)……伝動ケース、(16)……伝動軸、(20)……
ケーシング、(21)……摩擦板、(22)……バネ、(2
3)……ピストン、(28)……ロッド、(29)……ネジ
材、(30)……オイルシール、(B)……制動装置、
(R)……油室。The drawings show an embodiment of a braking system for a work vehicle according to the present invention,
FIG. 1 is a sectional view of a transmission case, FIG. 2 is a schematic rear view of a wheel loader, and FIG. 3 is an overall side view of the wheel loader. (15) …… Transmission case, (16) …… Transmission shaft, (20) ……
Casing, (21) …… Friction plate, (22) …… Spring, (2
3) …… Piston, (28) …… Rod, (29) …… Screw material, (30) …… Oil seal, (B) …… Brake,
(R) ... Oil chamber.
Claims (1)
してピストン(23)を制動解除方向に作動させ、排油時
には、バネ(22)の付勢力により摩擦板(21)を圧接す
る制動方向に向けてピストン(23)を作動させて摩擦板
(21)と伝動連結する走行用の伝動軸(16)に制動力を
作用させる作業車の制動装置であって、 前記伝動軸(16)の軸芯に沿う方向で該伝動軸(16)に
動力を伝える伝動ケース(15)の側に前記バネ(22)を
配置し、圧油供給により前記ピストン(23)が非制動位
置にある状態で前記摩擦板(21)を制動操作する人為操
作用のピストン(24)を前記摩擦板(21)を挟んで前記
バネ(22)と対向する側に配置し、前記ピストン(23)
を制動解除方向に作動させるための油室(R)を貫通し
てピストン(23)の押圧操作を行う制動力解除用のロッ
ド(28)を備え、このロッド(28)の反ピストン側に接
当して、螺進によりこのロッド(28)に押圧力を作用さ
せるネジ材(29)を、該制動装置(B)のケーシング
(20)の反伝動ケース側に備え、かつ、このロッド(2
8)の挿通する部位にオイルシール(30)を備えて成る
作業車の制動装置。Claims: 1. When pressure oil is supplied, the piston (23) is actuated in the braking release direction against the biasing force of the spring (22), and when draining oil, the friction plate (21) is driven by the biasing force of the spring (22). A braking device for a working vehicle, wherein a piston (23) is actuated in a braking direction in which pressure is applied to actuate a braking force on a traveling transmission shaft (16) that is transmission-coupled to a friction plate (21). The spring (22) is arranged on the side of the transmission case (15) that transmits power to the transmission shaft (16) in a direction along the axis of the shaft (16), and the piston (23) is not braked by supplying pressure oil. The piston (24) for manual operation for braking the friction plate (21) in the position is arranged on the side facing the spring (22) with the friction plate (21) interposed therebetween, and the piston (23 )
Is provided with a rod (28) for releasing the braking force that penetrates the oil chamber (R) for operating the engine in the braking release direction and presses the piston (23). A screw member (29) for exerting a pressing force on the rod (28) by screwing is provided on the side opposite to the transmission case of the casing (20) of the braking device (B), and the rod (2) is provided.
A braking device for a work vehicle, which is provided with an oil seal (30) at a portion through which 8) is inserted.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1989019109U JPH0650671Y2 (en) | 1989-02-21 | 1989-02-21 | Work vehicle braking system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1989019109U JPH0650671Y2 (en) | 1989-02-21 | 1989-02-21 | Work vehicle braking system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02110725U JPH02110725U (en) | 1990-09-05 |
JPH0650671Y2 true JPH0650671Y2 (en) | 1994-12-21 |
Family
ID=31234329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1989019109U Expired - Fee Related JPH0650671Y2 (en) | 1989-02-21 | 1989-02-21 | Work vehicle braking system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0650671Y2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5482284U (en) * | 1977-11-21 | 1979-06-11 |
-
1989
- 1989-02-21 JP JP1989019109U patent/JPH0650671Y2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH02110725U (en) | 1990-09-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |