JPH01119447U - - Google Patents
Info
- Publication number
- JPH01119447U JPH01119447U JP1128888U JP1128888U JPH01119447U JP H01119447 U JPH01119447 U JP H01119447U JP 1128888 U JP1128888 U JP 1128888U JP 1128888 U JP1128888 U JP 1128888U JP H01119447 U JPH01119447 U JP H01119447U
- Authority
- JP
- Japan
- Prior art keywords
- switching valve
- throttle
- pilot
- passage
- valve
- 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.)
- Granted
Links
- 238000010276 construction Methods 0.000 claims 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の実施例の油圧回路図、第２図
は従来装置の油圧回路図である。
Ａ，Ｂ……回路系統、１，４……ポンプ、２…
…パイロツト切換弁、３，６……走行用切換弁、
７……分岐通路、１０，１２，１５，２９，３１
，３３……作業機用切換弁、１９，３７……パラ
レル通路、２１……絞り付切換弁、４２，５２，
５５……パイロツト通路、４６，４７，４８，４
９，５０，５１，５３，５４……開閉弁、５９…
…絞り。
FIG. 1 is a hydraulic circuit diagram of an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram of a conventional device. A, B...Circuit system, 1, 4...Pump, 2...
...Pilot switching valve, 3,6...Travel switching valve,
7... Branch passage, 10, 12, 15, 29, 31
, 33... Switching valve for work equipment, 19, 37... Parallel passage, 21... Switching valve with throttle, 42, 52,
55... Pilot passage, 46, 47, 48, 4
9, 50, 51, 53, 54...Opening/closing valve, 59...
...Aperture.
Claims (1)
回路系統にはパラレル通路で接続された作業機用
切換弁と最上流の走行用切換弁とをタンデムに接
続すると共に走行用切換弁とこれに隣接する作業
機用切換弁とをつなぐ通路をパラレル通路に接続
し、一方の回路系統の走行用切換弁とポンプとの
間には、他方のポンプに分岐通路で接続され且つ
各回路系統のパラレル通路に接続されたパイロツ
ト切換弁を介装し、このパイロツト切換弁のパイ
ロツト油路に前記各切換弁の開閉弁を配設した建
設機械の油圧装置において、前記パイロツト油路
は少くとも１つの走行用切換弁と少くとも１つの
作業機用切換弁が共に機能位置をとる場合にのみ
パイロツト切換弁にパイロツト圧を導く構成とな
し、パイロツト切換弁は、このパイロツト切換弁
と連動する絞り付切換弁を介して一方のパラレル
通路に、又、絞り弁を介して他方のパラレル通路
に接続し、パイロツト圧が作用しないとき両ポン
プを自身の回路系統に接続すると共に、絞り付切
換弁をブロツク位置にとり、パイロツト圧が作用
するとき、一方のポンプを前記絞り弁に接続する
と共に、前記分岐通路を一方の回路系統の走行用
切換弁及び絞り付切換弁の絞りに接続し、さらに
パイロツト切換弁に設けた絞りを介して一方のポ
ンプに接続したことを特徴とする建設機械の油圧
装置。 (2) 絞り付切換弁が絞り弁である請求項１記載
の建設機械の油圧装置。[Scope of Claim for Utility Model Registration] (1) Two sets of circuit systems connected to pumps are provided, and each circuit system includes a working machine switching valve and an upstream travel switching valve connected in tandem through a parallel passage. At the same time, the passage that connects the traveling switching valve and the adjacent work equipment switching valve is connected to the parallel passage, and between the traveling switching valve and the pump in one circuit system, there is a branch to the other pump. A hydraulic system for construction machinery in which a pilot switching valve connected by a passage and connected to a parallel passage of each circuit system is interposed, and an on-off valve for each switching valve is disposed in a pilot oil passage of the pilot switching valve, The pilot oil passage is configured to guide pilot pressure to the pilot switching valve only when at least one travel switching valve and at least one working machine switching valve are both in the functional position. Connects to one parallel passage through a restrictor-equipped switching valve that works with the pilot switching valve, and to the other parallel passage through a throttle valve, and connects both pumps to their own circuit system when pilot pressure is not applied. At the same time, the switching valve with a throttle is placed in the blocking position, and when pilot pressure is applied, one pump is connected to the throttle valve, and the branch passage is connected to the running switching valve of one circuit system and the throttle of the switching valve with a throttle. A hydraulic system for construction machinery, characterized in that the hydraulic system is connected to one of the pumps through a throttle provided in the pilot switching valve. (2) The hydraulic system for construction machinery according to claim 1, wherein the switching valve with a throttle is a throttle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988011288U JPH0643259Y2 (en) | 1988-01-30 | 1988-01-30 | Hydraulic equipment for construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988011288U JPH0643259Y2 (en) | 1988-01-30 | 1988-01-30 | Hydraulic equipment for construction machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01119447U true JPH01119447U (en) | 1989-08-14 |
| JPH0643259Y2 JPH0643259Y2 (en) | 1994-11-09 |
Family
ID=31514821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988011288U Expired - Lifetime JPH0643259Y2 (en) | 1988-01-30 | 1988-01-30 | Hydraulic equipment for construction machinery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643259Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142235A (en) * | 1984-12-17 | 1986-06-30 | Sumitomo Heavy Ind Ltd | Oil-pressure circuit for construction machine such as oil-pressure shovel |
-
1988
- 1988-01-30 JP JP1988011288U patent/JPH0643259Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61142235A (en) * | 1984-12-17 | 1986-06-30 | Sumitomo Heavy Ind Ltd | Oil-pressure circuit for construction machine such as oil-pressure shovel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0643259Y2 (en) | 1994-11-09 |
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