CN1176902A - 重型建筑机械用的行走连动装置 - Google Patents
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Abstract
本发明涉及重型建筑机械用的行走连动装置,该装置包含分歧油路、油压缸和连接机构;分歧油路与减压阀和前后进选择阀之间的油路连接,该减压阀与行走踏板连动并将液压泵的排出油供给到前后进选择阀;油压缸与上述分歧油路连接,当行走踏板操作时,通过上述分歧油路得到液压泵的排出油;连接机构连接在发动机的节流阀与油压缸之间,上述油压缸的变位使节流杆变位而增减发动机的转数。
Description
本发明涉及重型建筑机械用的行走连动装置，更具体地说，是涉及一种能减少行走踏板的操作力、简便地调节发动机的旋转力、借助行走踏板的最大动作区间和行走阻力安全地变换发动机的输出和转矩、进行高效率驱动的重型建筑机械用的行走连动装置。
借助行走踏板的操作同时地控制主控制阀和发动机的装置是公知的。
即，如图1所示，操作行走踏板101和前后进选择阀103，从液压泵105排出的动作油通过与行走踏板101的操作连动的减压阀107及前后进选择阀103作为阀柱移动力作用到行走控制阀109的阀柱。这样，行走控制阀109 被切换、主泵P的排出油量通过控制阀109供给行走马达M，行走马达M根据前后进选择阀103的选择前进或后退。
另外，行走踏板101的移动力通过连动装置111和缆绳115传递给发动机的节流杆113，使操作行走踏板101的发动机ENG的转数增减。上述缆绳115的一端连接在设在行走踏板101底部的连动装置111上，另一端连接在发动机ENG的节流杆113上。
这样，借助行走踏板101的操作，就可同时地控制行走马达M和发动机ENG。
但是，上述的现有行走连动装置构造复杂，设计和组装都较困难，所以增加成本和工序。另外，因连动装置111的部分产生的油阻等原因，不能准确地对发动机ENG和行走马达M进行最适当的控制。
另外，在现有技术中还有一种能克服上述技术缺点的装置，该装置中是把行走踏板的移动力切换为油压力，用油压力使发动机的节流杆移动。与此相关的文献有日本实用新型公开公报昭和61-167440号(1986年10月17日公开)和韩国实用新型申请第95-06053号。
在日本实用新型公开公报平成3-42855号中揭示了一种更为先进的技术，该技术也是单纯地借助行走踏板的操作产生2次压力，行走控制阀被该2次压力直接或间接操作，该技术中是由该行走控制阀和另外设置的感知该2次压力的计算机构来操作泵和发动机。
但是，由于回流阀不适应异物质，行走控制阀不能复回到中立位置，在中止行走踏板的动作时，因油压阻力而不能使建筑机械停止。另外，将前后进选择阀操作为中立、行走控制阀的控制压油向油箱返回并被切换为中立位置时，建筑机械可能会停止，如果操作者不操作前后进选择阀，则发生安全事故的可能性非常高。
因此，本发明的目的在于提供一种能排除上述现有技术中发生安全事故可能性的重型建筑机械用的行走连动装置。该装置备有油压缸、限位开关和计算装置。油压缸行走踏板的2次压力成正比地增减发动机的转数，以便能减少行走踏板的踏力；限位开关设在行走踏板的下部，操作发动机的转数以便产生建筑机械行走所需的动力；计算装置将信号送给计算机构，使供给泵控制阀的电流值变化，上述泵控制阀用于操作泵，使发动机产生的动力被输入行走装置。
为了实现上述目的，本发明一实施例的重型建筑机械用的行走连动装置包含分歧油路、油压缸和连接机构；
分歧油路与减压阀和前后进选择阀之间的油路连接，该减压阀与行走踏板连动并将液压泵的排出油供给到前后进选择阀；
油压缸与上述分歧油路连接，当行走踏板操作时，通过上述分歧油路得到液压泵的排出油；
连接机构连接在发动机的节流阀与油压缸之间，上述油压缸的变位使节流杆变位而增减发动机ENG的转数。
借助上述行走踏板和前后进选择阀的操作，液压泵的排出油通过减压阀及前后进选择阀，使行走控制阀的阀柱移动，主泵的排出油通过被切换了的行走控制阀供给行走马达而进行前后进驱动，这一构造及作用与现有的相同，对此不作详细说明。
本发明中，设有开关动作机构、限位开关和控制器，开关动作机构附设在上述行走踏板的下段部，当行走踏板的动作到达下限点时，限位开关被开关动作机构动作，将机械变位变换为电气信号，控制器输入了限位开关的电气信号时，将发动机的转数控制为最大。
上述发动机上连接着检测转数用的转数检测机构，控制器根据转数检测机构的输入信号控制比例阀，控制主泵的排出油量，当无行走阻力时使发动机的转数最大，当有行走阻力时使发动机的转数减少，使发动机的输出和转矩及行走速度安全地变化进行有效的控制。
即、上述控制器这样进行 控制：发动机的转数最大时，使发动机输出的全部量被行走装置利用，行走速度达到最大；当因行走阻力发动机的转数减少时，使行走速度减慢，防止熄火。
图1是表示现有行走连动装置的图。
图2是表示本发明行走连动装置的图。
下面参照附图详细说明本发明重型建筑机械用的行走连动装置的实施例。
图2是表示本发明构造的图。图中1表示行走踏板，3表示前后进选择阀，5表示液压泵，7表示减压阀。当行走踏板1被操作时，减压阀7连动并将液压泵5的排出油传递给前后进选择阀3，主泵P1、P2与发动机ENG连接，行走控制阀9与行走马达M连接。
本发明重型建筑机械的行走连动装置由分歧油路13、油压缸15、连接机构19、开关动作机构33和限位开关31构成。分歧油路13从减压阀7与前后进选择阀3之间的油路11中的预定位置分歧出来；油压缸15与该分歧油路13连接，当行走踏板1被操作时，液压泵5的排出油通过分歧油路13供给油压缸15，该油压缸15与分歧油路13的压力成正比地作变位动作；连接机构19将油压缸15的动作变位量传递给发动机的节流杆21，使发动机的转数增减；开关动作机构33附设在行走踏板1下段部；限位开关31在行走踏板1的最大动作区间时，被开关动作机构33动作并将机械变位转换为电气信号。
上述限位开关31与控制器23电气连接。
上述控制器23连接着检测发动机ENG转数的转数检测机构35，还连接着使发动机ENG的节流杆21动作的步进马达25，步进马达25被发动机ENG的转数控制旋转，使节流杆21动作。
另外，在主泵P1、P2上连接着由控制器23控制的比例阀27，通过控制主泵P1、P2的阀板调节发动机ENG的排出动力。
图中29表示释放阀。
下面说明本发明装置的作用。上述控制器23接受限位开关31的电气信号，将电气信号(电流值的变化)送给为使发动机ENG的转数达到最大而连接着的步进马达25，步进马达25被该信号驱动，使发动机ENG的节流杆21作最大动作，使发动机ENG的输出为最大值。另外，控制器23向比例阀27送电气信号，控制主泵P1、P2的阀板，使发动机排出的动力全部供给行走装置，重型建筑机械的行走速度成为最大。
当行走阻力增加，发动机ENG的转数减少时，由转数检测机构35将发动机转数的变化量变换为电气信号并传递给控制器23，控制器23根据输入的电气信号再将电气信号传递给比例阀27，使排出油量减少以降低建筑机械的行走速度，这样，发动机的输出和转矩总是由行走阻力变化，防止熄火。
根据上述本发明重型建筑机械用的行走连动装置，当完全地操作行走踏板时，可保持建筑机械的最大速度，当不完全操作时，在限位开关动作前的状态下使用时，如通常的行走装置那样可恰当地使用建筑机械的输出，所以，可延长发动机的寿命。
另外，可防止现有技术中所使用的回流阀的误动作而引发的安全事故，根据行走踏板的操作行程，主控制阀控制装置的压力成正比，使用动作行程变化的油压缸，减少踏板的操作力可提高操作者的操作性。
Claims (4)
1.一种重型建筑机械用的行走连动装置，其特征在于其包含分歧油路、油压缸和连接机构；
分歧油路与减压阀和前后进选择阀之间的油路连接，该减压阀与行走踏板连动并将液压泵的排出油供给到前后进选择阀；
油压缸与上述分歧油路连接，当行走踏板操作时，通过上述分歧油路得到液压泵的排出油；
连接机构连接在发动机的节流阀与油压缸之间，上述油压缸的变位使节流杆变位而增减发动机的转数。
2.如权利要求1所述的重型建筑机械用的行走连动装置，其特征在于，含有开关动作机构、限位开关和控制器；
开关动作机构附设在行走踏板下段部；
限位开关当行走踏板为最大动作区间时被开关动作机构动作，将机械变位转换为电气信号；
控制器接受限位开关的电气信号，将发动机的转数控制为最大。
3.如权利要求2所述的重型建筑机械用的行走连动装置，其特征在于，含有检测发动机转数的转数检测机构、控制主泵排出油量的比例阀和控制器；控制器这样地控制上述比例阀和主泵：当发动机转数最大时，使发动机的输出全部量被行走装置利用，使行走速度达到最大，当发动机的转数因行走阻力而减少时，使行走速度减速。
4.如权利要求2所述的重型建筑机械用的行走连动装置，其特征在于，含有发动机步进马达，该步进马达根据限位开关的电气信号，使节流杆最大地动作，以便将发动机的输出达到最大。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR26082/96 | 1996-06-29 | ||
| KR1019960026082A KR100208728B1 (ko) | 1996-06-29 | 1996-06-29 | 건설 중장비용 주행연동장치 |
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| CN1176902A true CN1176902A (zh) | 1998-03-25 |
| CN1082909C CN1082909C (zh) | 2002-04-17 |
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| CN96120883A Expired - Fee Related CN1082909C (zh) | 1996-06-29 | 1996-12-11 | 重型建筑机械用的行走连动装置 |
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| US (1) | US5884479A (zh) |
| JP (1) | JP3732293B2 (zh) |
| KR (1) | KR100208728B1 (zh) |
| CN (1) | CN1082909C (zh) |
| DE (1) | DE19651506B4 (zh) |
| GB (1) | GB2314606B (zh) |
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| JP4294563B2 (ja) * | 2004-09-10 | 2009-07-15 | 日立建機株式会社 | 作業機械 |
| JP4171467B2 (ja) * | 2005-01-20 | 2008-10-22 | 株式会社小松製作所 | 建設機械の制御モード切換装置および建設機械 |
| CN104929999B (zh) * | 2015-06-29 | 2017-02-01 | 宁波精垦液压有限公司 | 全液压行走控制系统 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2449464A1 (de) * | 1974-10-19 | 1976-05-06 | Kloeckner Humboldt Deutz Ag | Hydrostatisches fahrzeuggetriebe |
| US4041702A (en) * | 1976-10-15 | 1977-08-16 | Caterpillar Tractor Co. | Control system for a fluid drive vehicle |
| DE2700803C2 (de) * | 1977-01-11 | 1982-10-28 | Sauer Getriebe KG, 2350 Neumünster | Regelungssystem für eine Antriebseinrichtung |
| GB2128718B (en) * | 1979-11-23 | 1984-11-14 | Linde Ag | Drive unit consisting of an internal combustion engine and a steplessly adjustable hydrostatic transmission |
| GB2064073B (en) * | 1979-11-23 | 1984-02-15 | Linde Ag | Conjoint control of engine and infinitely variable transmission |
| US4864994A (en) * | 1981-11-16 | 1989-09-12 | Sundstrand Corporation | Engine override controls |
| JPS6488716A (en) * | 1987-09-30 | 1989-04-03 | Komatsu Mfg Co Ltd | Automatic driving device for traveling vehicle |
| EP0407618B1 (en) * | 1989-01-27 | 1994-11-23 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive travelling system |
| JP3335677B2 (ja) * | 1992-09-22 | 2002-10-21 | 株式会社小松製作所 | 建設機械の走行操作装置 |
-
1996
- 1996-06-29 KR KR1019960026082A patent/KR100208728B1/ko not_active IP Right Cessation
- 1996-12-10 US US08/762,953 patent/US5884479A/en not_active Expired - Fee Related
- 1996-12-11 GB GB9625700A patent/GB2314606B/en not_active Expired - Lifetime
- 1996-12-11 CN CN96120883A patent/CN1082909C/zh not_active Expired - Fee Related
- 1996-12-11 DE DE19651506A patent/DE19651506B4/de not_active Expired - Fee Related
- 1996-12-12 JP JP35220696A patent/JP3732293B2/ja not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1082909C (zh) | 2002-04-17 |
| KR100208728B1 (ko) | 1999-07-15 |
| DE19651506A1 (de) | 1998-01-02 |
| KR980001208A (ko) | 1998-03-30 |
| JPH1030465A (ja) | 1998-02-03 |
| GB9625700D0 (en) | 1997-01-29 |
| JP3732293B2 (ja) | 2006-01-05 |
| GB2314606B (en) | 2000-07-26 |
| GB2314606A (en) | 1998-01-07 |
| DE19651506B4 (de) | 2005-09-15 |
| US5884479A (en) | 1999-03-23 |
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