JP2887390B1 - Hydraulic equipment - Google Patents

Abstract

A hydraulic drive mechanism for operating a hydraulic actuator (11) is reduced in weight and size, and is improved in handling and operability. Easily reduce manufacturing costs and improve durability. SOLUTION: A hydraulic gear pump (20) to be hydraulically connected to a hydraulic actuator (11) and an oil tank (23) are fixed to an oil passage base (21), and a handle (26) for manual rotation is operated by a speed increasing input shaft ( 34), a speed increasing input shaft (34) is rotatably provided on the oil passage base (21), and the speed increasing input shaft (34) is connected to the gear pump (20) via speed increasing gears (36) and (37). ) Pump input shaft (3
It is characterized in that it is connected to 5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic system for cargo handling such as a lift truck or a winch for loading and lifting or transporting a load on a loading platform.

[0002]

Conventionally, a lift provided with a loading platform mounted on a mast so as to be able to move up and down, and front and rear wheels for supporting the mast, wherein the loading platform is lifted up by a hydraulic lift cylinder to load and unload cargo. Although there is a truck, the hydraulic lift cylinder that raises the loading platform was operated by the plunger pump, so it was necessary to attach a long pumping handle and a strong lever member to operate the plunger pump, hydraulic drive to operate the hydraulic lift cylinder It is not possible to easily reduce the size and weight of the mechanism, to reduce its own weight to a weight that can be easily carried (20 kg or less), and to secure a work space for swinging the pumping handle. Yes, it is easy to restrict use in narrow places such as inside a truck box,
There is a problem that it is not easy to improve handling operability in a small place.

[0003]

According to the present invention, a hydraulic gear pump and an oil tank which are hydraulically connected to a hydraulic actuator are fixed to an oil passage base, and a handle which is manually rotated is mounted on a speed increasing input shaft. An input shaft is rotatably provided on the oil passage base, and the speed increasing input shaft is connected to a pump input shaft of the gear pump via a speed increasing gear. The oil tank and the oil passage base are made of a lightweight material such as aluminum alloy. It can be made of a material, and the handle, gear pump, tank, etc. can be compactly arranged around the oil passage base, making it easy to reduce the weight and size of the hydraulic drive mechanism that operates the hydraulic actuator, and to improve handling operability. It is necessary to drive the hydraulic actuator because the handle rotation speed is increased and transmitted from the speed increase input shaft to the pump input shaft. Obtained easily generated by high speed rotation of the gear pump to a high pressure oil, in which like simplification and gear pump manufacturing cost and durability of the wheel turning manual operation can easily performed.

In addition, a handle for manual rotation or an output shaft of an electric rotating member is selectively connected to a speed-increasing input shaft so as to be interchangeable. For example, an electric rotating member such as a portable electric screwdriver (drill) is used. By rotating the speed increasing input shaft by using the gear pump, the gear pump can be operated by selectively using the manual structure using the handle and the electric structure using the electric rotating member, expanding the application range of the hydraulic actuator and improving the driving function, etc. Can be easily achieved.

Further, a reverse rotation preventing member for preventing reverse rotation of the speed increasing input shaft due to operation of the handle is provided, so that the gear pump can be easily prevented from being reversely rotated and damaged by the reverse rotation operation of the handle, and the gear pump can be prevented. This facilitates simplification of the hydraulic circuit structure connected to the oil passage, facilitates downsizing of the oil passage base, reduction of the manufacturing cost, and the like.

In addition, a pressure relief valve and a pressure relief lever for returning hydraulic oil of the hydraulic actuator to the oil tank are provided on the oil passage base, so that the hydraulic piping structure for connecting the gear pump and the oil tank to the hydraulic actuator can be simplified. The stop function of the hydraulic actuator can be easily improved by interposing a check valve between the hydraulic pump having a one-way drive structure such as a ram-type hydraulic cylinder and the gear pump, thereby improving the workability and handling of the hydraulic actuator. The operation can be simplified easily.

In addition, a pressure adjusting valve for operating the hydraulic actuator at a certain load or less is provided on the oil passage base. The driving of the hydraulic actuator by the gear pump is restricted to drive the hydraulic actuator within a range of the initially set capacity. In addition, it is possible to easily prevent damage to the gear pump or the hydraulic actuator due to overload operation of the gear pump, and prevent leakage of hydraulic oil.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view, FIG. 2 is a plan view of the same,
FIG. 3 is a rear view of the same, and FIG. 4 is a folding explanatory diagram. The fork-type carrier (1) on which the load (A) is placed, and a pair of left and right masts (2) on which the carrier (1) is mounted so as to be able to move up and down. A base frame (3) for erecting the mast (2) substantially vertically and a pair of left and right leg frames (6) for pivotally supporting a pair of left and right front and rear wheels (4) and (5) are made of a prism made of an aluminum alloy. The lift frame (7) is attached to the mast (2) so as to be able to move up and down freely, and the loading platform (1) is connected to the lift frame (7) via a bending support shaft (8) so as to be rotatable upward. At the same time, the top plate (9) is fixed between the upper parts of the left and right masts (2), and the bottom plate (10) is placed between the lower parts of the left and right masts (2).
, And a single-acting (ram) type hydraulic lift cylinder (11) is erected and fixed on the upper surface of the bottom plate (10) between the left and right masts (2), and a pulley (13) is mounted on the upper end of the piston (12) of the cylinder (11). ), And the loading platform (1) and cylinder (11)
An intermediate portion of a load wire (14) for fixing both ends is wound around a pulley (13) to be stretched, and the loading platform (1) is raised and lowered by raising and lowering a piston (12).

Further, a handle (15) for pushing and pulling is fixed to the back of the upper end of the mast (2), and a handle (16) for lowering the hand is fixed to the middle side of the mast (2) in the vertical direction. A fulcrum frame (17) is fixed to the upper surface of the base frame (3), and the lower end of the mast (2) is rotatably connected to the fulcrum frame (17) forward through a folding support shaft (18), as shown in FIG. The mast (2) is erected by fixing the lock bolts (19) as shown in FIG. 4, and the mast (2) is rotated forward by about 90 degrees as shown in FIG. It is configured to hold and carry.

Further, as shown in FIGS. 5 to 9, a hydraulic gear pump (2) for driving the lift cylinder (11) is provided.
0), a square plate-shaped oil passage base (21) for fixing the pump (20), and an oil tank (23) fitted and fixed to the base (21) via a 0-ring packing (22).
An oil passage base (21) is formed of an aluminum alloy, and an oil passage base (21) is detachably fixed to a back surface of the mast (2) via a hydraulic frame (24).
The handle (2
6) is attached to the rear side of the oil passage base (21). The loading platform (1) which opens and closes by rotating the pressure release lever (27), the pressure release valve for lowering (28), the suction check valve (29), and the pressure adjustment valve (30) are connected to the oil passage base (21). ), The oil in the tank (23) is pumped from the pump (20) to the lift cylinder (11) by a one-way rotating operation of the handle (26) to raise the loading platform (1), while depressurizing. The pressure relief valve (28) is opened by rotating the lever (27), and the oil in the lift cylinder (11) is returned to the tank (23) to lower the carrier (1).

A stopper (32) of the pressure release lever (27) is brought into contact with a regulating shaft (31) provided on the oil passage base (21), and the opening of the lever (27) is regulated by the stopper (32). The maximum opening degree of the pressure relief valve (28) is limited, and the hydraulic oil of the lift cylinder (11) is gently returned to the tank (23) to prevent a rapid drop of the cargo bed (1). A) is heavy, and when the lifting operation load of the lift cylinder (11) becomes more than a certain value, the gear pump (2)
The pressure oil from 0) returns from the pressure regulating valve (30) to the tank (23) to prevent the gear pump (20) from overloading the lift cylinder (11).

Further, a gear case (33) made of an aluminum alloy is fixed to the oil passage base (21), and the speed increasing input shaft (3) is attached to the oil passage base (21) and the gear case (33).
4) is rotatably mounted, the ratchet (25) is fixed to the speed increasing input shaft (34), the reverse rotation of the input shaft (34) is prevented by the ratchet (25), and the pump input of the gear pump (20) is performed. The gear (3) is mounted on the shaft (35).
6) Connect the speed increasing input shaft (34) via (37),
The rotation speed of the handle (26) removably fitted to the square shaft head (38) of the speed-increasing input shaft (34) is controlled by the pump input shaft (3).
It is configured to increase the transmission speed to 5).

As shown in FIGS. 8 and 9, a socket (4) for connecting a rotary output shaft (40) of a rechargeable electric wrench (39) to a square head (38) of a speed increasing input shaft (34).
1) is provided, the handle (26) is removed from the square shaft head (38), the socket (41) is fitted to the square shaft head (38), and the rotary output shaft (40) of the wrench (39) is detachably attached. The gear pump (20) is driven by rotating the speed-up input shaft (34) by the electric rotating force of the wrench (39), and the handle (26) and the electric wrench (39) are interchangeably selected. It is connected to the speed increasing input shaft (34). Further, a high-pressure coupler (42) and a drain coupler (43) are provided on the oil passage base (21), and a high-pressure pipe (44) and a drain pipe (45) are provided between the lift cylinder (11) and the oil passage base (21). They are detachably connected via couplers (42) and (43).

As is apparent from the above description, the hydraulic gear pump (20), which is hydraulically connected to the lift cylinder (11), which is a hydraulic actuator, and the oil tank (23) are fixed to the oil passage base (21) and are manually rotated. A handle (26) is mounted on the speed increasing input shaft (34), and the speed increasing input shaft (34) is rotatably provided on the oil passage base (21),
Speed-up input shaft (34) via speed-up gears (36) (37)
Is connected to a pump input shaft (35) of the gear pump (20). The oil tank (23) and the oil passage base (21) are formed of a lightweight material such as an aluminum alloy, and the handle (26), the gear pump (20), and the tank (23) are arranged around the oil passage base (21). The hydraulic drive mechanism for operating the lift cylinder (11) is reduced in weight and size and the handling operability is improved, and the speed increase input shaft (34) is connected to the pump input shaft (35). The rotation speed of the handle (26) is increased and transmitted, and high-pressure oil necessary for driving the lift cylinder (11) is generated by high-speed rotation of the gear pump (20). 20) The manufacturing cost is reduced and the durability is improved.

A handle (26) for manual rotation;
Alternatively, the output shaft (40) of the electric wrench (39), which is an electric rotating member, is selectively connected to the speed-increasing input shaft (34) so as to be interchangeable, and for example, an electric wrench such as a portable electric screwdriver (drill) The speed increasing input shaft (34) is rotated by using (39), and the gear pump (20) is operated by selectively using the manual structure using the handle (26) and the electric structure using the electric wrench (39). A ratchet (25) which is a reverse rotation preventing member for preventing the reverse rotation of the speed increasing input shaft (34) by operating the handle (26), while expanding the application range of (11) and improving the driving function, and the like.
To prevent the gear pump (20) from rotating in reverse and being damaged by the reverse rotation operation of the handle (26), and to simplify the hydraulic circuit structure connected to the gear pump (20), etc. 21), the size and the manufacturing cost can be reduced.

Further, a pressure relief valve (28) and a pressure relief lever (27) for returning the hydraulic oil of the lift cylinder (11) to the oil tank (23) are provided on the oil passage base (21). Lift the tank (23) with the lift cylinder (1
While simplifying the hydraulic piping structure connected to 1),
The stop function of the lift cylinder (11) is improved by interposing a check valve (29) between the lift cylinder (11) having a one-way drive structure such as a ram-type hydraulic cylinder and the gear pump (20).
In addition to improving the workability of 1) and simplifying the handling operation, a pressure adjusting valve (30) for operating the lift cylinder (11) at a certain load or less is provided on the oil passage base (21), and the gear pump (20) is used. Lift cylinder (1
The lift cylinder (11) is driven within the range of the initially set capacity by restricting the drive of 1), and the damage prevention and operation of the gear pump (20) or the lift cylinder (11) due to the overload operation of the gear pump (20) are performed. It is configured to prevent oil leakage.

FIG. 10 shows a hydraulic actuator in which a hydraulic motor (46) for driving a winch (B) for winding the wire (B1) is provided as a hydraulic actuator instead of the lift cylinder (11). ) And a low pressure pipe (48) to connect the hydraulic motor (46) to each coupler (42) (43) of the oil passage base (21),
The gear pump (20) is driven by the handle (26) or the electric wrench (39), the pressure oil of the gear pump (20) is supplied to the hydraulic motor (46), and the winch (B) is driven by the hydraulic motor (46). , And the wire (B1) is wound.

[0018]

As is apparent from the above embodiments, the present invention fixes the hydraulic gear pump (20) and the oil tank (23) to be hydraulically connected to the hydraulic actuator (11) to the oil passage base (21), A rotating handle (26) is attached to the speed increasing input shaft (34), and the speed increasing input shaft (34) is rotatably provided on the oil passage base (21),
Speed-up input shaft (34) via speed-up gears (36) (37)
Is connected to a pump input shaft (35) of the gear pump (20). The oil tank (23) and the oil passage base (21) can be formed of a lightweight material such as an aluminum alloy. ) Handle around (2)
6) and the gear pump (20) and the tank (23) can be disposed compactly, and the weight and size of the hydraulic drive mechanism for operating the hydraulic actuator (11) can be easily reduced, and the handling operability can be easily improved. While you can
Since the rotation speed of the handle (26) is transmitted from the speed increasing input shaft (34) to the pump input shaft (35) at an increased speed, the high-pressure oil necessary for driving the hydraulic actuator (11) is supplied by the high speed rotation of the gear pump (20). It can be easily generated and simplifies the manual operation of rotating the handle (26) and the gear pump (2
0) The manufacturing cost can be reduced and the durability can be easily improved.

Also, a handle (26) for manual rotation,
Alternatively, the output shaft (40) of the electric rotating member (39) is selectively connected to the speed-increasing input shaft (34) so as to be interchangeable, and for example, an electric rotating member (eg, a portable electric screwdriver (drill)). By rotating the speed increasing input shaft (34) by using (39), the gear pump (20) can be operated by selectively using the manual structure using the handle (26) and the electric structure using the electric rotating member (39). It is possible to easily expand the applicable range of the hydraulic actuator (11) and improve the driving function.

Further, a reverse rotation preventing member (25) for preventing reverse rotation of the speed increasing input shaft (34) by operation of the handle (26) is provided. The gear pump (20) is rotated by the reverse rotation of the handle (26). It is possible to easily prevent damage due to reverse rotation, simplify the hydraulic circuit structure connected to the gear pump (20), etc., reduce the size of the oil passage base (21) and reduce the manufacturing cost. Can be easily achieved.

A pressure relief valve (28) and a pressure relief lever (27) for returning hydraulic oil of the hydraulic actuator (11) to the oil tank (23) are provided on the oil passage base (21). ) And the hydraulic piping structure for connecting the oil tank (23) to the hydraulic actuator (11) can be easily simplified, and the hydraulic actuator (11) having a one-way drive structure such as a ram hydraulic cylinder.
The stop function of the hydraulic actuator (11) can be easily improved by interposing a check valve (29) between the hydraulic actuator (1) and the gear pump (20).
It is possible to easily improve the workability of 1) and simplify the handling operation.

Further, a pressure regulating valve (30) for operating the hydraulic actuator (11) at a certain load or less is provided on the oil passage base (21), and the drive of the hydraulic actuator (11) by the gear pump (20) is restricted. And the hydraulic actuator (11) can be driven within the range of the initially set capacity, and it is easy to prevent the gear pump (20) or the hydraulic actuator (11) from being damaged by the overload operation of the gear pump (20) and to prevent the hydraulic oil from leaking. It can be aimed at.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a plan view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is an explanatory view of folding.

FIG. 5 is a side view of a hydraulic gear pump section.

FIG. 6 is a sectional view of the same.

FIG. 7 is a front view of the same.

FIG. 8 is a work explanatory diagram.

FIG. 9 is a hydraulic circuit diagram.

FIG. 10 is a hydraulic circuit diagram showing a modification.

[Explanation of symbols]

 (11) Hydraulic lift cylinder (hydraulic actuator) (20) Hydraulic gear pump (21) Oil passage base (23) Oil tank (25) Ratchet (reverse rotation prevention member) (26) Handle (27) Depressurizing lever (28) Depressurizing Valve (30) Pressure adjusting valve (34) Speed-up input shaft (35) Pump input shaft (36) (37) Speed-up gear (39) Electric wrench (electric rotating member) (40) Output shaft (46) Hydraulic motor ( Hydraulic actuator)

Claims (5)

(57) [Claims] 1. A hydraulic gear pump to be hydraulically connected to a hydraulic actuator and an oil tank are fixed to an oil passage base, and a handle for manual rotation is attached to a speed increasing input shaft.
A hydraulic device wherein a speed-increasing input shaft is rotatably provided on the oil passage base, and the speed-increasing input shaft is connected to a pump input shaft of the gear pump via a speed-increasing gear. 2. The hydraulic device according to claim 1, further comprising a reverse rotation preventing member for preventing a reverse rotation of the speed increasing input shaft due to a handle operation. 3. The hydraulic device according to claim 1, wherein an output shaft of the manually rotating handle or the electric rotating member is selectively connected to the speed-increasing input shaft in a freely interchangeable manner. 4. The hydraulic apparatus according to claim 1, wherein a depressurizing valve and a depressurizing lever for returning hydraulic oil of the hydraulic actuator to the oil tank are provided on the oil passage base. 5. The hydraulic device according to claim 1, wherein a pressure adjusting valve for operating the hydraulic actuator at a certain load or less is provided on the oil passage base.