JPH0484739U

JPH0484739U -

Info

Publication number: JPH0484739U
Application number: JP12649590U
Authority: JP
Priority date: 1990-11-30
Filing date: 1990-11-30
Publication date: 1992-07-23

Description

[Brief explanation of the drawing]

第１図は本考案に係る油圧式シヨベルのエンジ
ンコントロール装置を示す図。第２図は第１図の
作用を説明するための所定の寸法、作用する力及
び作用するトルク等を記入した図。第３図はエン
ジン回転数がＭＡＸの状態におけるエンジンガバ
ナーの姿勢を示す図。第４図はアクチユエータが
作動した状態を示す図。第５図はアクチユエータ
が作動した状態で、スロツトルレバーのマニユア
ル操作によりヨークを最大限右側に引きＭＩＮに
した状態を示す図。第６図は従来の油圧式シヨベ
ルのエンジンコントロール装置の概略図。第７図
は第６図に示した従来の油圧式シヨベルのコント
ロール装置の改良型の部分図。第８図は従来の油
圧式シヨベルのコントロール装置の別の例を示す
図。図において；１……スロツトルレバー、２……
プツシユプルケーブル、３……エンジンガバナー
、４……高速側アジヤストボルト、５……低速側
アジヤストボルト、６……圧縮スプリング、６′
……引張スプリング、７……アクチユエータ、８
……ワイヤーケーブル、９……ワイヤーケーブル
、１０……ヨーク、１１……スロツトルレバー、
１２……スプリング、１３……エンジンガバナー
、１４……リンク、１５……リンク、１６……シ
リンダ、１７……スロツトルモータ、Ｆｓ……圧
縮スプリング力、ｌｓ……Ｆｓの回転中心からの
腕の長さ、ＦＴｓ……引張スプリング力、ｌＴｓ
……ＦＴｓの回転中心からの腕の長さ、Ｔ……ト
ルク、ＦＤ_１，ＦＤ_２……アクチユエータの引張
力、ｌＤ_１，ｌＤ_２……各々ＦＤ_１，ＦＤ_２の回
転中心からの腕の長さ、ｌ……アクチユエータの
ストローク。 FIG. 1 is a diagram showing an engine control device for a hydraulic shovel according to the present invention. FIG. 2 is a diagram in which predetermined dimensions, acting forces, acting torques, etc. are filled in to explain the action of FIG. 1. FIG. 3 is a diagram showing the attitude of the engine governor when the engine speed is MAX. FIG. 4 is a diagram showing a state in which the actuator is activated. FIG. 5 is a diagram showing a state in which the yoke is pulled as far to the right as possible by manual operation of the throttle lever to the MIN position with the actuator in operation. FIG. 6 is a schematic diagram of a conventional hydraulic shovel engine control device. FIG. 7 is a partial view of an improved version of the conventional hydraulic shovel control device shown in FIG. FIG. 8 is a diagram showing another example of a conventional hydraulic shovel control device. In the diagram; 1... Throttle lever, 2...
Push-pull cable, 3...Engine governor, 4...High speed side adjustment bolt, 5...Low speed side adjustment bolt, 6...Compression spring, 6'
...Tension spring, 7... Actuator, 8
... wire cable, 9 ... wire cable, 10 ... yoke, 11 ... throttle lever,
12...Spring, 13...Engine governor, 14...Link, 15...Link, 16...Cylinder, 17...Throttle motor, Fs...Compression spring force, ls...Arm from the center of rotation of Fs Length, FTs...Tension spring force, lTs
...Length of the arm from the center of rotation of FTs, T... Torque, FD ₁ , FD ₂ ... Tensile force of the actuator, lD ₁ , lD ₂ ... Length of the arm from the center of rotation of FD ₁ and FD ₂ , respectively. Length, l...actuator stroke.

Claims

[Scope of utility model registration request]

By operating the throttle lever 1, the engine governor 3, which is slidably engaged with the yoke 10, is freely pushed and pulled via the push-pull cable 2, thereby setting the engine speed as desired. In a hydraulic excavator that can be used, an actuator 7 applies a torque to cause the engine governor 3 to rotate to a higher engine speed side by a spring force of a compression spring 6, or has a tensile force to overcome this torque.
is provided, and when the throttle lever 1 is on the high speed side, the on-off operation of the actuator 7 gives rotation to the engine governor 3 to the low speed side via the wire cable 8 or 9, thereby achieving the desired engine rotation. A hydraulic shovel engine control device that allows the engine speed to be instantly lowered to a certain number.