To provide an industrial vehicle hydraulic transmission capable of achieving both improvement in clutch cooling performance with hydraulic oil and enhanced response of a clutch with respect to inching valve operation.SOLUTION: An industrial vehicle hydraulic transmission 20 comprises a clutch cooling hydraulic oil passage 38 which guides hydraulic oil passed through a torque converter 11 to a cooler 36 and also guides the hydraulic oil cooled with the cooler 36 to a clutch 12. The industrial vehicle hydraulic transmission also has: a conduction hydraulic oil passage which connects an inching valve 30 and the clutch cooling hydraulic oil passage 38 and guides a portion of hydraulic oil from the inching valve 30 to the clutch cooling hydraulic oil passage 38 during inching; a check valve 45 which is installed on the conduction hydraulic oil passage and prevents the hydraulic oil from flowing back to the inching valve 30; a drain hydraulic oil passage which is connected to a place between the check valve 45 and the inching valve 30 in the conduction hydraulic oil passage; and a residual pressure relief device which is installed on the drain hydraulic oil passage and releases residual pressure in the conduction hydraulic oil passage.SELECTED DRAWING: Figure 1
【課題】作動油によるクラッチの冷却性向上とインチングバルブの操作に対するクラッチの優れた応答性とを両立させることが可能な産業車両の油圧駆動装置の提供にある。【解決手段】トルクコンバータ11を通過した作動油を冷却器36へ導き、冷却器36により冷却された作動油をクラッチ12へ導くクラッチ冷却用のクラッチ冷却油路38を有する産業車両の油圧駆動装置20において、インチングバルブ30とクラッチ冷却油路38とを接続し、インチング時に作動油の一部をインチングバルブ30からクラッチ冷却油路38へ導く導通油路と、導通油路に設けられ、インチングバルブ30への逆流を防止する逆止弁45と、導通油路における逆止弁45とインチングバルブ30との間に接続されるドレン油路と、ドレン油路に設けられ、導通油路の残圧を開放する残圧開放器と、を有した。【選択図】 図1
INDUSTRIAL VEHICLE HYDRAULIC TRANSMISSION
産業車両の油圧駆動装置
27.05.2021
Patent
Elektronische Ressource
Japanisch
IPC: | F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last |