JPH0754994A - Hydraulic transmission device - Google Patents
Hydraulic transmission deviceInfo
- Publication number
- JPH0754994A JPH0754994A JP5198173A JP19817393A JPH0754994A JP H0754994 A JPH0754994 A JP H0754994A JP 5198173 A JP5198173 A JP 5198173A JP 19817393 A JP19817393 A JP 19817393A JP H0754994 A JPH0754994 A JP H0754994A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- swash plate
- movable swash
- oil
- hydraulic pump
- 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.)
- Pending
Links
Landscapes
- Reciprocating Pumps (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は油圧伝動装置の変速操作
の操作力を軽減し、中立位置で確実に出力軸の回転を停
止させるための技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing the operating force of a gear shifting operation of a hydraulic power transmission device and reliably stopping the rotation of an output shaft at a neutral position.
【０００２】[0002]
【従来の技術】従来から油圧伝動装置は公知となってお
り、例えば、特開平１−２３８７６１号や実開平２−４
０５９号公報の技術がある。該技術は油圧伝動装置の操
作性を向上させるべくその中立範囲を拡大する手段とし
て、閉回路内の後進側で高圧となる油路に絞りを介して
タンクへの排出路を設けて、閉回路より常時作動油をド
レンさせるようにしていた。2. Description of the Related Art Conventionally, hydraulic power transmission devices have been known, for example, Japanese Patent Laid-Open No. 1-238761 and Japanese Utility Model Laid-Open No. 2-4.
There is a technology of 059 publication. As a means for expanding the neutral range of the hydraulic transmission in order to improve the operability of the hydraulic transmission, a drain passage to the tank is provided in the closed passage by providing a discharge passage to the tank through a throttle in the oil passage that becomes high pressure on the reverse side. The hydraulic oil was constantly drained.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の技術で
は油圧伝動装置の中立範囲はある程度拡大されるが、油
圧ポンプの可動斜板の傾倒一に関わらず、閉回路の作動
油が常時タンクに漏れているので、油圧伝動装置の容積
効率が低下するものであり、また、前進側と後進側の容
量のバランスが崩れ、また、前進又は後進から中立位置
へ戻した時に油圧モータの出力伝動系にブレーキをかけ
ないと油圧モータの出力回転を確実に止めることはでき
なかったのである。However, in the prior art, although the neutral range of the hydraulic transmission is expanded to some extent, the hydraulic oil in the closed circuit is constantly supplied to the tank regardless of the tilt of the movable swash plate of the hydraulic pump. Since there is a leak, the volumetric efficiency of the hydraulic transmission is reduced, the capacity balance between the forward and reverse sides is lost, and the output transmission system of the hydraulic motor is changed when the vehicle is returned from the forward or reverse to the neutral position. The output rotation of the hydraulic motor could not be reliably stopped unless the brake was applied to.
【０００４】[0004]
【課題を解決するための手段】本発明は上記のような課
題を解決するために、次のような手段を用いるものであ
る。即ち、油圧ポンプと油圧モータを接続する閉回路を
形成し、油圧ポンプの可動斜板の背面を、ハウジングに
形成した断面円弧状の案内面に沿って摺動自在に配置
し、前記案内面に油孔を開口して前記閉回路の高圧側と
連通させると共に、可動斜板が中立位置から一定の摺動
範囲α内にあるときに前記油孔をハウジング内に連通す
る油溝を可動斜板の背面に設けたものである。The present invention uses the following means in order to solve the above problems. That is, a closed circuit that connects the hydraulic pump and the hydraulic motor is formed, and the back surface of the movable swash plate of the hydraulic pump is slidably arranged along a guide surface having an arcuate cross section formed on the housing, and the guide surface is An oil groove is opened to communicate with the high pressure side of the closed circuit, and an oil groove for communicating the oil hole with the housing when the movable swash plate is within a certain sliding range α from the neutral position is formed with the movable swash plate. It is provided on the back of.
【０００５】また、前記油圧モータの出力伝動系に、油
圧モータの駆動の妨げとならない程度の軽い制動力を有
するブレーキ装置を設け、好ましくは、該ブレーキ装置
は、油圧ポンプの可動斜板が前記の摺動範囲α内にある
ときに制動し、それ以外の範囲で制動が解除されるよう
に油圧ポンプの可動斜板と連動連係させるように構成し
たり、また、油圧ポンプの可動斜板が前記の範囲にあっ
ても人為的に制動を解除可能とする操作具が備えられて
いるように構成しても良い。Further, the output transmission system of the hydraulic motor is provided with a brake device having a light braking force that does not hinder the driving of the hydraulic motor. Preferably, the brake device has the movable swash plate of the hydraulic pump. Of the hydraulic pump is linked to the movable swash plate of the hydraulic pump so that the braking is performed when the sliding range is within the range α, and the braking is released in the other range. It may be configured such that an operation tool that can artificially release the braking is provided even within the above range.
【０００６】[0006]
【作用】このような手段を用いることによって、可動斜
板を摺動操作する時に可動斜板の背面とハウジングの案
内面との間には閉回路の高圧側の圧油が送られて摺動操
作力が小さくて済むようになり、中立近辺の一定の摺動
範囲内の位置では圧油が油溝に流れてハウジング内に排
出される為、油圧ポンプから若干量の油が吐出されてい
ても油圧モータは動力を出力しない中立状態を維持する
ようになる。なお、この時油圧モータの、出力軸は伝動
系がブレーキ装置によって、制動されると閉回路の圧力
が上昇し、前記油溝からの油排出量が増大し、油溝を大
きくすることなしに、更に中立を確実に得ることができ
る。By using such means, when the movable swash plate is slid, the pressure oil on the high pressure side of the closed circuit is sent between the back surface of the movable swash plate and the guide surface of the housing to slide. A small operating force is required, and at a position within a certain sliding range near neutral, pressure oil flows into the oil groove and is discharged into the housing, so a small amount of oil is discharged from the hydraulic pump. Also, the hydraulic motor maintains a neutral state in which it does not output power. At this time, when the transmission system of the output shaft of the hydraulic motor is braked by the braking device, the pressure in the closed circuit rises, the amount of oil discharged from the oil groove increases, and without increasing the oil groove. In addition, neutrality can be surely obtained.
【０００７】[0007]
【実施例】次に本発明の一実施例を図面に従って説明す
る。図１は本発明の油圧伝動装置の側面断面図、図２は
可動斜板の操作部とブレーキ装置操作部の斜視図であ
る。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a hydraulic power transmission device of the present invention, and FIG. 2 is a perspective view of an operating portion of a movable swash plate and a braking device operating portion.
【０００８】図１において、本発明の油圧伝動装置は油
路板２に油圧ポンプＰと油圧モータＭを装着してハウジ
ング１に内装して成り、前記ハウジング１と油路板２
に、前記油圧ポンプＰを駆動する入力軸３が横架され、
その下方に、前記油圧モータＭにより駆動される出力軸
４を平行に横架している。該出力軸４にブレーキ装置Ｂ
が配され、前記入力軸３と出力軸４の端部は油路板２よ
り外へ突出して任意の原動機及び、被駆動装置が接続さ
れる。Referring to FIG. 1, the hydraulic transmission of the present invention is constructed by mounting a hydraulic pump P and a hydraulic motor M on an oil passage plate 2 and installing the hydraulic pump P and a hydraulic motor M inside the housing 1.
The input shaft 3 for driving the hydraulic pump P is horizontally mounted on the
Below that, the output shaft 4 driven by the hydraulic motor M is horizontally provided in parallel. A brake device B is attached to the output shaft 4.
The end portions of the input shaft 3 and the output shaft 4 project outward from the oil passage plate 2 and are connected to an arbitrary prime mover and a driven device.
【０００９】前記油圧ポンプＰは、シリンダブロック１
１を入力軸３上にスプライン嵌合し、該シリンダブロッ
ク１１にはピストン１２・１２・・・を往復動自在に挿
入し、該ピストン１２・１２・・・頭部を可動斜板１３
に当接させて成る。該可動斜板１３は一端に係合部１３
ａを設けて後述するアーム１７の先端部１７ａを挿入す
るようにしている。該可動斜板１３のピストン１２の当
接面と反対側の背面は断面視円弧状の凸部とし、ハウジ
ング１の内面を断面視円弧状の凹部を形成して案内面１
ａとし、前記可動斜板１３の背面は案内面１ａに沿って
摺動するように嵌合されている。The hydraulic pump P is a cylinder block 1
1 is spline-fitted onto the input shaft 3, pistons 12, 12, ... Are reciprocally inserted into the cylinder block 11, and the pistons 12, 12 ,.
Abutting against. The movable swash plate 13 has an engaging portion 13 at one end.
A is provided so that a tip portion 17a of the arm 17 described later is inserted. The rear surface of the movable swash plate 13 opposite to the contact surface of the piston 12 is a convex portion having an arcuate cross section, and the inner surface of the housing 1 is formed with a concave portion having an arcuate cross section to form a guide surface 1.
a, the back surface of the movable swash plate 13 is fitted so as to slide along the guide surface 1a.
【００１０】そして、ハウジング１の案内面１ａの中央
部には油孔１ｂが開口され、該油孔１ｂは後述する閉回
路の高圧側と接続され、一方、可動斜板１３の背面の略
中央から側方へ、ハウジング１内に向けて開口する油溝
１３ｂが形成されて、可動斜板１３が中立位置から一定
の摺動範囲α内にあるときにのみ、前記油孔１ｂが油溝
１３ｂを介してハウジング１内に連通するように配設さ
れて前記摺動範囲αから外れると、前記油孔１ｂは可動
斜板１３の背面で閉鎖されるのである。An oil hole 1b is opened in the center of the guide surface 1a of the housing 1, and the oil hole 1b is connected to the high-voltage side of a closed circuit described later, while the rear surface of the movable swash plate 13 is substantially in the center. From the side to the side, an oil groove 13b opening toward the inside of the housing 1 is formed, and only when the movable swash plate 13 is within a certain sliding range α from the neutral position, the oil hole 1b is formed into the oil groove 13b. The oil hole 1b is closed on the back surface of the movable swash plate 13 when the oil hole 1b is disposed so as to communicate with the housing 1 via the and moves out of the sliding range α.
【００１１】油圧モータＭは、出力軸４上にシリンダブ
ロック１４をスプライン嵌合し、該シリンダブロック１
４にはピストン１５・１５・・・を往復動自在に挿入
し、該ピストン１５・１５・・・頭部を固定斜板１６に
当接させて成る。In the hydraulic motor M, the cylinder block 14 is spline-fitted onto the output shaft 4 to provide the cylinder block 1.
4, pistons 15, 15 ... Are reciprocally inserted so that the heads of the pistons 15, 15 ... Contact the fixed swash plate 16.
【００１２】また、前記油路板２には前記のシリンダー
ブロック１１・１４が当接して回転自在に摺動できるよ
うに取付面が形成され、該取付面上にはそれぞれ一対の
キドニーポート２ａ・２ｂ及び、２ｃ・２ｄを穿設し
て、それぞれ一対の油路２ｅ・２ｆにて連通して、油圧
ポンプＰと油圧モータＭの間で作動油が循環するように
閉回路を形成している。そして、チャージポンプＣｐか
ら吐出される圧油はチェックバルブ２０・２０を介して
閉回路内へ補給できるようにしている。２１はチャージ
圧を設定するリリーフバルブである。A mounting surface is formed on the oil passage plate 2 so that the cylinder blocks 11 and 14 can abut and rotate freely, and a pair of kidney ports 2a and 2d are mounted on the mounting surface. 2b, 2c and 2d are bored, communicated with a pair of oil passages 2e and 2f, respectively, and a closed circuit is formed so that hydraulic oil circulates between the hydraulic pump P and the hydraulic motor M. . The pressure oil discharged from the charge pump Cp can be replenished into the closed circuit via the check valves 20. Reference numeral 21 is a relief valve for setting the charge pressure.
【００１３】そして、前記閉回路を形成する油路２ｅ・
２ｆ間に連絡油路１８が連通され、該連絡油路１８の中
途部にシャトル弁１９が介装され、該シャトル弁１９よ
り分岐した油路１９ａが前記油孔１ｂと接続されてい
る。なお、油孔１ｂへの油路１９ａ途中に絞り２２が配
設されている。よって、後述する変速操作ペダル２９を
回動して可動斜板１３を正転方向、或いは逆転方向に摺
動すると、油路２ｅ・２ｆの一方が高圧となり、高圧側
の油路から連絡油路１８に至った圧油はシャトル弁１９
の作動により低圧側は閉じられて油孔１ｂ側へ流れるよ
うになり、前記案内面１ａから可動斜板１３の背面へ圧
油が送油されて潤滑するようになり、可動斜板１３の摺
動摩擦が減少されて、変速操作ペダル２９の操作力の増
加を低減する。可動斜板１３が真の中立位置の時には油
圧ポンプＰは圧油を発生しないが、それより外れた前記
摺動範囲α内では、圧油が連絡油路１８より油孔１ｂへ
流れて油溝１３ｂに至り、該油溝１３ｂよりハウジング
内へ排出される。The oil passage 2e, which forms the closed circuit,
A communication oil passage 18 is communicated between 2f, a shuttle valve 19 is interposed in the middle of the communication oil passage 18, and an oil passage 19a branched from the shuttle valve 19 is connected to the oil hole 1b. A throttle 22 is provided midway in the oil passage 19a to the oil hole 1b. Therefore, when the shift operation pedal 29 described later is rotated to slide the movable swash plate 13 in the normal direction or the reverse direction, one of the oil passages 2e and 2f becomes a high pressure, and the oil passage from the high pressure side to the communication oil passage. The pressure oil that reached 18 is the shuttle valve 19
The low-pressure side is closed by the operation of (1) to flow to the oil hole 1b side, and the pressure oil is sent from the guide surface 1a to the back surface of the movable swash plate 13 to lubricate the movable swash plate 13. The dynamic friction is reduced, and the increase in the operating force of the shift operation pedal 29 is reduced. When the movable swash plate 13 is in the true neutral position, the hydraulic pump P does not generate pressure oil, but within the sliding range α outside of that, the pressure oil flows from the communication oil passage 18 to the oil hole 1b and the oil groove is formed. 13b, the oil is discharged into the housing through the oil groove 13b.
【００１４】前記ブレーキ装置Ｂは次の構成をしてい
る。即ち、ハウジング１の外側面にブレーキケース５を
付設し、該ブレーキケース５内に前記出力軸４の一端を
挿入し、該出力軸４の端部上に摩擦板６・６・・・を一
体回転可能に固設し、該摩擦板６・６・・・に対して交
互に摩擦板７・７・・・を配置して、摩擦板７・７・・
・をブレーキケース５の内面に回転不能に嵌合し、両摩
擦板６・７を圧接可能にアクチュエータ９をブレーキケ
ース５内に挿入し、該アクチュエータ９はバネ８にて摩
擦板６・７の圧接方向に常時、油圧モータＭの駆動の妨
げにならない程度の軽い制動力を出力軸４に与える程度
に付勢され、該アクチュエータ９と一体のロッド９ａは
ブレーキケース５より外側へ突出している。The brake device B has the following structure. That is, a brake case 5 is attached to the outer surface of the housing 1, one end of the output shaft 4 is inserted into the brake case 5, and friction plates 6, 6, ... Are integrated on the end portion of the output shaft 4. It is fixed rotatably, and the friction plates 7.6 are alternately arranged with respect to the friction plates 6.6.
Is non-rotatably fitted to the inner surface of the brake case 5, and the actuator 9 is inserted into the brake case 5 so that both friction plates 6 and 7 can be pressed against each other. The rod 9a integral with the actuator 9 is projected outward from the brake case 5 by being constantly urged in the pressing direction to such an extent that a light braking force that does not hinder the driving of the hydraulic motor M is applied to the output shaft 4.
【００１５】そして、前記ロッド９ａの端部は図２に示
すように、リンク２３の一端と連結され、該リンク２３
の他端はアーム２４の一端と枢結されている。該アーム
２４はその中途部に回動支点があり、その他端にワイヤ
ー２５の一端を枢支している。該ワイヤー２５の他端は
アーム２７の一端と枢結し、該アーム２７にはその中途
部に回動支点があり、アーム２７の他端に配されたロー
ラを前記可動斜板１３を回動させる前記アーム１７の他
側に設けたＶ字形凹部１７ｂに係合させ、該アーム１７
の別のアーム部１７ｃに変速操作ペダル２９と連動連結
している。アーム２７には付勢バネ２７ａが係止され
て、前記凹部１７ｂの深部へアーム２７のローラが滑り
込んで、アーム１７、即ち可動斜板１３に、中立姿勢へ
自動復帰するような付勢力が作用するようにしている。The end of the rod 9a is connected to one end of a link 23, as shown in FIG.
The other end of is connected to one end of the arm 24. The arm 24 has a rotation fulcrum in the middle thereof, and one end of the wire 25 is pivotally supported at the other end. The other end of the wire 25 is pivotally connected to one end of an arm 27, and the arm 27 has a rotation fulcrum in the middle thereof, and a roller arranged at the other end of the arm 27 rotates the movable swash plate 13. The arm 17 is engaged with a V-shaped recess 17b provided on the other side of the arm 17,
Is connected to another arm portion 17c of the gearshift operation pedal 29. A biasing spring 27a is locked to the arm 27, and the roller of the arm 27 slides into the deep portion of the recess 17b, and a biasing force that automatically returns to the neutral posture on the arm 17, that is, the movable swash plate 13 acts. I am trying to do it.
【００１６】変速操作ペダル２９を操作して、アーム１
７が前記一定の摺動範囲αを越える回動量に達すると、
アーム２７、ワイヤー２５、アーム２４、リンク２３を
介してロッド９ａ及びアクチュエータ９がバネ８に抗し
て引っ張られて摩擦板６・７間の圧接が解除され、出力
軸４に制動力が与えられずロスなく回転できるように
し、アーム１７が前記範囲α内にあると、ブレーキ装置
Ｂが作動し、その制動力により出力軸４の回転が阻止さ
れる。By operating the shift operation pedal 29, the arm 1
When 7 reaches a rotation amount exceeding the above-mentioned constant sliding range α,
The rod 9a and the actuator 9 are pulled against the spring 8 via the arm 27, the wire 25, the arm 24, and the link 23 to release the pressure contact between the friction plates 6 and 7, and the braking force is applied to the output shaft 4. When the arm 17 is in the range α, the brake device B is actuated, and the braking force prevents the output shaft 4 from rotating.
【００１７】また、前記アーム２４の端部には円弧状の
長孔２４ａが開口され、該長孔２４ａにワイヤー２６の
一端が係合されている。これは前記ワイヤー２５がアー
ム２４を回動した時に、該アーム２４の回動力がワイヤ
ー２６に伝わらないようにする為である。該ワイヤー２
６の他端はアーム３０に枢結される。該アーム３０には
リンク３２を介して接当アーム３３と枢結され、該接当
アーム３３の他端には前記チェックバルブ２０・２０の
解除ロッドと当接され、更に、前記アーム３０の他端に
は操作具としてバイパス操作レバー３１と連結されてい
る。An arc-shaped long hole 24a is formed at the end of the arm 24, and one end of a wire 26 is engaged with the long hole 24a. This is to prevent the turning force of the arm 24 from being transmitted to the wire 26 when the wire 25 rotates the arm 24. The wire 2
The other end of 6 is pivotally connected to the arm 30. The arm 30 is pivotally connected to a contact arm 33 via a link 32, and the other end of the contact arm 33 is in contact with the release rod of the check valve 20, 20. A bypass operation lever 31 is connected to the end as an operation tool.
【００１８】このように構成することによって、前記バ
イパス操作レバー３１を回動するとアーム３０と接当ア
ーム３３が連動して回動し、接当アーム３３はチェック
バルブ２０・２０の解除ロッドを押して閉回路の油路２
ｅ・２ｆ間を連通させることにより油圧モータＭへ圧油
が送られなくなり油圧モータＭは作動せず出力軸４が回
転自在となり、同時に、アーム３０がワイヤー２６を引
っ張ることによりアーム２４、リンク２３を介してロッ
ド９ａを引っ張って摩擦板６・７間の圧接を解除して、
出力軸４に作用するブレーキ装置Ｂの制動力を牽引等の
時に解除するようにしている。With this structure, when the bypass operating lever 31 is rotated, the arm 30 and the contact arm 33 are rotated in conjunction with each other, and the contact arm 33 pushes the release rod of the check valve 20. Closed circuit oil passage 2
By communicating between e and 2f, pressure oil is not sent to the hydraulic motor M, the hydraulic motor M does not operate, and the output shaft 4 becomes rotatable, and at the same time, the arm 30 pulls the wire 26 so that the arm 24 and the link 23 Through the rod 9a to release the pressure contact between the friction plates 6 and 7,
The braking force of the brake device B that acts on the output shaft 4 is released when pulling or the like.
【００１９】[0019]
【発明の効果】本発明は以上のように構成したので次の
ような効果を奏するものである。即ち、請求項１の如
く、可動斜板がその中立位置から一定の摺動範囲内にあ
る時には、閉回路の高圧側と連通して案内面に開口した
油孔が該可動斜板の背面に設けた油溝と連通するので、
油溝から高圧側の圧油がハウジング内へドレンされ、高
圧側の圧力上昇が抑制されて、油圧モータは駆動されず
中立範囲が拡大する。Since the present invention is constructed as described above, it has the following effects. That is, when the movable swash plate is within a certain sliding range from its neutral position as in claim 1, an oil hole communicating with the high-voltage side of the closed circuit and opened on the guide surface is formed on the back surface of the movable swash plate. Since it communicates with the oil groove provided,
The pressure oil on the high pressure side is drained from the oil groove into the housing, the pressure increase on the high pressure side is suppressed, the hydraulic motor is not driven, and the neutral range is expanded.
【００２０】また、可動斜板が一定の摺動範囲を越える
と、油孔は可動斜板の背面により閉鎖されるので、油圧
伝動装置の容積効率の低下が抑制されるとともに、高圧
側の圧力が上昇して油圧モータが駆動を開始する。そし
て、油孔から可動斜板の背面に送り込まれた圧油は該背
面に油膜を形成することとなり、可動斜板の摺動抵抗の
軽減となり、操作性が向上する。Further, when the movable swash plate exceeds a certain sliding range, the oil hole is closed by the back surface of the movable swash plate, so that the volume efficiency of the hydraulic power transmission is prevented from being lowered and the pressure on the high pressure side is suppressed. Rises and the hydraulic motor starts driving. The pressure oil sent from the oil holes to the back surface of the movable swash plate forms an oil film on the back surface, which reduces the sliding resistance of the movable swash plate and improves the operability.
【００２１】また、請求項２の如く、油圧モータの出力
伝動系にはブレーキ装置により、油圧モータの駆動の妨
げとならない程度の軽い制動力が作用しているので、高
圧側と低圧側との圧力差が大きくなり、可動斜板が一定
の摺動範囲内にある時に可動斜板の背面の油溝から作動
油のドレンされる量が増え中立範囲も大きくなる。Further, as described in claim 2, since the output transmission system of the hydraulic motor is acted by the braking device to exert a light braking force to the extent that it does not hinder the driving of the hydraulic motor, the high pressure side and the low pressure side are connected. When the pressure difference increases and the movable swash plate is within a certain sliding range, the amount of hydraulic oil drained from the oil groove on the back surface of the movable swash plate increases and the neutral range also increases.
【００２２】また請求項３の如く、油圧ポンプの可動斜
板が前記の範囲外に位置した時に、自動的に油圧モータ
の出力伝動系に作用するブレーキ装置の制動力が解除さ
れるようにすると、摩擦部品の摩耗及び焼き付き等の発
生が抑えられブレーキ装置の耐久性が高められる。Further, when the movable swash plate of the hydraulic pump is located outside the above range, the braking force of the brake device acting on the output transmission system of the hydraulic motor is automatically released. The wear of the friction parts and the occurrence of seizure are suppressed, and the durability of the brake device is enhanced.
【００２３】また請求項４の如く、油圧ポンプの可動斜
板が前記の範囲にあっても、実施例に示したバイパス操
作レバー等の操作具を人為的に操作した時に、任意にブ
レーキ装置の制動力が解除されるようにすると、車両の
牽引時等に油圧モータの出力伝動系に作用する負荷を軽
減でき、ブレーキ装置の摩擦部品の摩耗及びの焼き付き
等の発生がなくなるのである。Further, even if the movable swash plate of the hydraulic pump is in the above range as described in claim 4, when the operation tool such as the bypass operation lever shown in the embodiment is manually operated, the brake device is arbitrarily operated. When the braking force is released, the load acting on the output transmission system of the hydraulic motor when the vehicle is towed can be reduced, and wear and seizure of friction parts of the brake device are eliminated.
【図１】本発明の油圧伝動装置の側面断面図である。FIG. 1 is a side sectional view of a hydraulic transmission device of the present invention.
【図２】可動斜板の操作部とブレーキ装置操作部の斜視
図である。FIG. 2 is a perspective view of an operating portion of a movable swash plate and an operating portion of a brake device.
Ｐ 油圧ポンプ Ｍ 油圧モータ Ｃｐ チャージポンプ １ ハウジング １ａ 案内面 １ｂ 油孔 ２ 油路板 １３ 可動斜板 １３ｂ 油溝 ２９ 変速操作ペダル ３１ バイパス操作レバー P hydraulic pump M hydraulic motor Cp charge pump 1 housing 1a guide surface 1b oil hole 2 oil passage plate 13 movable swash plate 13b oil groove 29 speed change operation pedal 31 bypass operation lever
Claims (4)
ングに形成した断面円弧状の案内面に沿って摺動自在に
配置し、前記案内面に油孔を開口して、油圧ポンプと油
圧モータを接続する閉回路の高圧側と連通させるととも
に、可動斜板が中立位置から一定の摺動範囲内にあると
きに前記油孔をハウジング内に連通する油溝を可動斜板
の背面に設けたことを特徴とする油圧伝動装置。1. A back surface of a movable swash plate of a hydraulic pump is slidably arranged along a guide surface having an arc-shaped cross section formed in a housing, and an oil hole is opened in the guide surface to provide a hydraulic pump and a hydraulic pump. An oil groove is provided on the back surface of the movable swash plate that communicates with the high pressure side of the closed circuit that connects the motor and that communicates the oil hole with the housing when the movable swash plate is within a certain sliding range from the neutral position. A hydraulic power transmission device characterized in that
油圧モータの出力伝動系に、油圧モータの駆動の妨げと
ならない程度の軽い制動力を有するブレーキ装置を設け
たことを特徴とする油圧伝動装置。2. The hydraulic transmission according to claim 1,
A hydraulic transmission device characterized in that a brake device having a light braking force that does not hinder driving of the hydraulic motor is provided in an output transmission system of the hydraulic motor.
前記ブレーキ装置は、油圧ポンプの可動斜板が前記の摺
動範囲内にあるときに制動し、それ以外の範囲では制動
が解除されるように油圧ポンプの可動斜板と連動連係さ
せてあることを特徴とする油圧伝動装置。3. The hydraulic transmission device according to claim 2,
The brake device is interlocked with the movable swash plate of the hydraulic pump so that braking is performed when the movable swash plate of the hydraulic pump is within the sliding range, and the braking is released in other ranges. Hydraulic transmission characterized by.
前記ブレーキ装置には、油圧ポンプの可動斜板が前記の
範囲にあっても人為的に制動を解除可能とする操作具が
備えられていることを特徴とする油圧伝動装置。4. The hydraulic transmission according to claim 3,
The hydraulic transmission device, wherein the brake device is provided with an operation tool that can artificially release the braking even when the movable swash plate of the hydraulic pump is in the above range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5198173A JPH0754994A (en) | 1993-08-10 | 1993-08-10 | Hydraulic transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5198173A JPH0754994A (en) | 1993-08-10 | 1993-08-10 | Hydraulic transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0754994A true JPH0754994A (en) | 1995-02-28 |
Family
ID=16386692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5198173A Pending JPH0754994A (en) | 1993-08-10 | 1993-08-10 | Hydraulic transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754994A (en) |
-
1993
- 1993-08-10 JP JP5198173A patent/JPH0754994A/en active Pending
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