JP3525801B2 - Hydraulic tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] The present invention relates to a hydraulic pump having a hydraulic pump.
In addition, the pressure used for caulking crimp terminals to electric wires, etc.
The present invention relates to a hydraulic tool such as a mounting tool. [0002] 2. Description of the Related Art A conventional hydraulic tool of this type has a tool body.
Cylindrical on the side of the output cylinder device located on the tip side
Oil tank was protruding. [0003] However, in the distribution board,
When working in narrow places, such as crimping crimp terminals,
Lutank was in the way. Also, on the tip side of the body
The balance is poor because heavy objects are placed, and
The problem of poor workability due to the large moment
there were. Therefore, an object of the present invention is to provide
Hydraulic tools that can easily perform work and long hours of work
To provide. [0005] A hydraulic tool according to claim 1,
Is a motor and a hydraulic pump driven by the motor
Output pump that is connected to this hydraulic pump and driven to advance.
An output cylinder device having a stone and the output piston
The work part that is connected to
Arranged coaxially on the torso, with a grip protruding from the torso
Hydraulic tool, wherein the cylinder of the output cylinder device is
Oil tank connected to the
Is provided in the cylinder chamber and is pressurized in the cylinder chamber.
A release valve for discharging fluid, and the body of the tool body
Provided near the grip part protruding from the part
A release button for operating the release valve.
Tank and the release valveThe operation unit ofOf the torso
It is arranged on the opposite side to the grip part, and the release valve
SaidConnect the operation unit and the release button via a lever
IPower switch with a switch handle
The switch handle near the switch handle.
Arrange a lease button, the lever is pivotally supported pivotally,
The distance between the pivot point and the operating part of the release valve
Is smaller than the distance between the pivot point and the release button.
Things. According to the hydraulic tool of the first aspect, the motor
, Pump, output cylinder device, and work part on a straight line
Place the oil tank on the body opposite the grip
Because it is located above
As the il tank does not protrude as in the past,
Of the oil tank with the back of the hand when holding the body.
The balance of the grip
It is small, so you can work comfortably for a long time
it can.Power switch with switch handle
Is stored in the grip section, and
Switch handle and lily
The operability of the button is improved. In addition, the lever can rotate freely
Between the rotation fulcrum and the operating part of the release valve.
Is smaller than the distance between the pivot point and the release button.
Leverage the lever with the light operating force of the release button.
The operation part of the lease valve can be reliably operated. [0007] [0008] [0009] [0010] [0011] DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. That is, this hydraulic tool
Crimping tool used to crimp a crimp terminal to the end of a wire
It is. As shown in FIG. 1, this hydraulic tool is
130 and a hydraulic port driven by the motor 130.
Pump 140 and connected to this hydraulic pump 140 to advance
Output cylinder device with driven output piston 51
3 and a wire connected to the output piston 51 and driven to advance.
And a crimping die 120 as a work part. And this
These are attached to the body 151 of the tool body 150 as shown in FIG.
It is arranged coaxially, and the grip 152 projects from the body 151.
Has been established. The output cylinder device 3 contacts the cylinder chamber 50.
The connected oil tank 100 and the output cylinder device 3
The pressurized fluid in the cylinder chamber 50 provided in the cylinder chamber 50
Release valve 70 (see FIG. 10) for discharging air
A grip 152 protruding from a body 151 of the body 150
Release that is provided near the valve and operates the release valve 70
A button 153 is provided. Oil tank 100 and lily
The source valve 70 is connected to the body 151 on the opposite side of the grip 152.
It is located at the top and has a release valve 70Operation piece 77And lily
Button 153 is connected via a lever 155. This
Lever 155 is rotatably supported, and its rotation fulcrum and
Distance between the release valve 70 and the operation piece 77 which is the operation part of the release valve 70
Is smaller than the distance between the pivot point and the release button 153.
Comb. The lever 155 of the embodiment is shown in FIG.
And a support shaft 155c is provided at a substantially middle portion thereof.
The outer periphery of the hydraulic pump 140 near the cylinder chamber 50
And the support shaft 155c is formed on the wall of the cylinder chamber 50.
The bearing hole is supported. On the other hand, it can be operated by being connected to the motor 130.
Switch 157 provided with a simple switch handle 156
Is stored in the grip portion 152 and the switch handle 156 is
Release button 1 at the top of the
53 are arranged. As described above, the release button 153 is
Handle 156 is located adjacent to the handle 156.
Operation restricting portion 158 for preventing the operation of the switch handle 156
And the release button 153 is in the release valve operating position.
Sometimes, the switch handle 156 is moved to the ON position.
Release the release button 153
When the switch is in the initial position, which is the
A second operation for preventing the operation of moving the dollar 156 to the ON position
An operation control unit 159 is provided on the release button 153. this
The release button 153 is a slide button,
The trigger handle which is dollar 156 is provided so that it can move forward and backward.
Power switch 157 switch case and trigger
An operation that is a lock piece of the release button 153 with the handle
Position the regulating parts 158 and 159
Block operations. Thus, the release button 153 is
Initial position that is the ON operation restriction position of the trigger handle
And the trigger handle on-operation non-restricted position and the trigger
ー Release valve actuated position which is the ON operation restriction position of the handle
It can be moved to three positions. FIG. 2 shows a release button 15 from the line AA in FIG.
3, lever 155, switch handle 156
The switch handle 156 of the power switch 157
Release button 153 at a position between
Just slides through the base of the grip 152
Are located in The release button 153 has a strip shape.
Operation restricting section 1 on the surface facing the switch handle 156.
58 and the second operation restricting portion 159 are
Side by side at a slightly wider interval than the width of the
By sliding the lease button 153, the switch handle 15
Switch handle 15 between 6 and switch case
6 at the neck 156a. Also
Release button 153 is placed on the opposite side of lease button 153.
Push the end of lever 155 by riding
The protrusion 160 is provided. In addition, Lily
Stopping the button 153 from the tool body 150 is an operation restriction.
Portions 158 and 159 are also used. FIG. 3 shows a release button viewed from the line BB in FIG.
153 shows the relationship between the power switch 157 and release
A positioning piece 161 is provided on the side surface of the button 153 to perform positioning.
On the surface of the piece 161, a mountain-shaped concave portion 162 and a convex portion 163 are formed.
Has formed. Also, the positioning piece 161 of the tool body 150
A spring positioning portion 165 is provided in a portion facing
Position both ends of a click spring 166 formed by a U-shaped leaf spring
And click the center projection 167 of the click spring 166
162 can be elastically engaged. Spring positioning part 16
5 is a supporting surface 165b for supporting the click spring 166.
Storage recess for storing one end of click spring 166 at one end
165a is formed and a stopper (not shown) is provided at the other end.
I have stopped it. Release button 153 and switch handle
Regarding the operation of 156, each (a) of FIGS.
The release handle is in the locked state of the switch handle 156.
153 is the initial position. At this time, the click spring 16
No. 6 protrusion 167 engages with recess 162 of release button 153
Then, when the release button 153 is positioned,
67 is separated from the rear end 155a of the lever 155,
Control part 158 is attached to neck 156a of switch handle 156.
positioned. Therefore, the switch handle 156 is turned off.
Operation is restricted and the power switch 157 must be turned on.
Can not. Each of FIGS. 2 and 3 shows a switch-on state.
, Which is a position where the steering wheel is not turned on. This and
Slide the release button 153 one step and click
The spring 166 gets over the convex portion 163 and gives a click feeling.
At the same time, the operation restricting portion 158
Switch handle 1 because it is away from the neck 156a
56 can be turned on, and the protrusion 167
Release button pressed against lever 155 when hitting 55
153 is positioned on the slope of the convex portion 163. FIGS. 2C and 3C show the state at the time of release.
This is the release valve operating position of the release button 153. This
, The release button 153 is further moved in the same direction as above by one.
The second operation restricting portion 159 is in a state of being slid step by step.
Since it enters the neck 156a of the switch handle 156,
At the same time as the lock, the lever 155 is
And the lever 155 rotates around the support shaft 155c.
The operation part of the release valve 70 is provided by the tip 155b of the lever 155.
Operation piece 77 against the spring force of an internal spring 76 described later.
Press and operate the release valve 70 to release
You. Release the release button 153 and release the
Lever 155 and release button with restoring force of internal spring 76
Position where 153 returns and power switch 157 can be turned on
That is, it returns to FIG. Note that the battery pack is attached to the end of the grip 152.
A motor 160 may be provided as a drive source for the motor 130. As shown in FIG. 4, the crimping device main body includes a tool.
The crimping die 120 is mounted on the tip of the main body 150.
A concave 21 is provided in the opening / closing portion 123 of the crimping die 120.
And the tip of the output piston 51 of the output cylinder device 3
A convex 122 as a work part is provided, and
Of the crimping die 120 by the reciprocating operation of the
1 and the convex mold 122 are opened. The crimping of the crimp terminal is performed as follows.
You. That is, the opening / closing section 123 is opened and closed to open the concave of the crimping die.
An electric wire (not shown) and pressure are applied between the mold 121 and the convex mold 122.
A receiving terminal (not shown) is inserted, and the
The mold 122 is turned into the concave mold 121 by the operation of the output piston 51.
The crimp terminal is crimped to the wire by approaching. As described above, the body 1 of the tool body 150
51, a motor 130 and the motor 130
Hydraulic pump 140 connected to the hydraulic pump 140
The output cylinder device 3 is housed. Hydraulic pump 1
40 and the output cylinder device 3, the power device of the crimping tool
Make up. The motor 130 has a tool body 150
Battery pack 160 mounted on lip 152 or commercial AC
Electric power is supplied from a power supply such as a power supply. As shown in FIG. 4, the hydraulic pump 140
Axia with shaft rotation system and automatic variable type swash plate
With an automatic flow control mechanism
A plate device 1 and a cylinder device 2 are provided. Swash plate device
Reference numeral 1 denotes a cylindrical oil chamber 4 which is filled with a fluid such as oil.
The cylinder device 2 is attached to one end opening of the
The oil chamber 4 is attached to a small-diameter opening at the other end of the oil chamber 4.
Filled with oil. The swash plate device 1 is driven by a motor 130.
And a rotating shaft 5 serving as a power transmission shaft to be driven.
A support shaft 6 having a different axial direction, and a sliding surface 7a
Around the support shaft 6 so as to be inclined with respect to the axial direction of
The swash plate 7 is provided so as to be movable, and the swash plate 7 is tilted.
Tilt posture restoring means for restoring force
Spring 8. In the embodiment, the base end 17 of the rotating shaft 5 is used.
Is a bearing 15 serving as a bearing in the center of the motor mount 9.
And the tip 5a of the rotating shaft 5 serves as a bearing.
Provided at the center of the cylinder device 2 via a bearing 16
It is attached to the recess. Motor 1 on motor mount 9
30 is attached, and the drive shaft of the motor 130 and the rotating shaft 5
The base end 17 is connected. The motor mount 9 is
The abutment on one end of the opening edge and the screw hole 18
Together with bolts 130 (not shown)
You. The cylinder device 2 has a screw 19 formed on the outer periphery, and oil
Threadedly attached to a female screw formed on the inner peripheral surface at the other end of the chamber 4
O-ring is formed in a peripheral groove formed on the peripheral surface of the cylinder device 2.
20 is attached to the inner circumference of the oil chamber 4 in a liquid-tight manner.
You. Also, the motor mount 9 is fitted into the opening of the oil chamber 4.
A peripheral groove is formed on the peripheral surface of the
The O-ring 21 is attached to the peripheral groove of
Liquid tightly adhered. 22 is an oil screen provided on the projection 11.
It is. The rotary shaft 5 has a flange at a position inside the oil chamber 4.
24 is provided, and one side of the flange 24 with respect to the rotation shaft 5.
For example, a long stopper 25 using a pin is provided upright,
A short stopper 26 using a pin is provided on the side.
The support shaft 6 is rotated in the oil chamber 4 by a fulcrum pin, for example.
It is provided at right angles to the shaft 5. The swash plate 7 inserts the rotating shaft 5
Attached to both ends of the support shaft 6 with a through hole 7b at the center
To be rotatable between the pair of stoppers 25 and 26.
You. The rotation range is, for example, in a direction perpendicular to the rotation axis 5.
It is about 1.5 to 10 degrees. The spring 8 is an example
For example, using a plurality of coil springs,
Compression is interposed between the flange 24 and the swash plate 7, and the swash plate 7 is
4 in the direction away from the edge 24,
Locked to a stopper 26. The spring 8 is similar to a coil spring.
Alternatively, a leaf spring or a combination thereof can be used. The cylinder device 2 is mounted on the sliding surface 7a of the swash plate 7.
It has a cylinder 30 which is arranged oppositely, and this cylinder 30
Are parallel to the rotating shaft 5 and open toward the swash plate 7.
A cylinder recess 33 is formed, and these cylinder recesses 33 are formed.
From the cylinder recess 33 via the first check valve 34 at the bottom
Each of the cylinder recesses 33 has a discharge portion 35 capable of discharging.
The swash plate 7 is inserted into the opening of
Fixed on the swash plate 7 so as to move back and forth
The piston portion 37 has an advancing operation to
A suction means for sucking fluid at the bottom of the cylinder recess 33
You. In the embodiment, the cylinder of the cylinder device 2
30 is attached to the other end of the oil chamber 4. Cylinder recess
As for 33, as shown in FIG.
Lined up at equal intervals, the first through a small diameter communication passage 44 at the bottom
A discharge section 35 having a check valve 34 is provided. Pis
The tip of the ton portion 37 slidably contacts the sliding surface 7a of the swash plate 7.
And is pressed and urged by the spring 36.
A spring receiving portion 46 using a ring is provided at an end, and a piston portion is provided.
One end of a spring 36 using, for example, a coil spring passed through 37
To the spring receiving portion 46, and the other end to the cylinder 30 of the cylinder 30.
The piston portion 3 is locked in the front end locking recess of the
7 to project and bias the partial spherical surface at the tip end of the piston portion 37.
It is in contact with the sliding surface 7a of the plate 7. As a result, the swash plate 7
When the rotary shaft 5 rotates together with the rotation, the piston portion 37 is inclined.
One rotation of the plate 7 repeats one reciprocating stroke.
You. As shown in an enlarged view in FIG.
A suction port 39 is provided at the tip side of the stone portion 37, and a piston portion is provided.
A discharge port 40 is provided on the rear end side of the
Second check valve 4 operable to discharge into passage 41 between
2 are provided. The second check valve 42 includes a ball valve 42a and a ball
A spring 42b for pushing the valve 42a and a spring for supporting the spring 42b
And a thread portion 42c. Screw portion 42c is a discharge port
40 into a female screw formed at 40, and a valve such as a ball valve 42
a is a valve at the end of the small-diameter portion 41a on the suction port 39 side of the passage 41.
It contacts the seat 41b. Adjust the screwing amount of the screw part 42c
Then, the force with which the ball valve 42a presses the valve seat 41b is adjusted.
It is. The suction port 39 advances from the cylinder recess 33 to the swash plate 7 side.
It is located in the oil chamber 4 during the suction operation
When the piston portion 37 moves forward, the cylinder recess 3
Since the volume of the cylinder 3 increases, the cylinder recess 33 becomes negative pressure.
The ball valve 42a of the second check valve 42 is opened from the valve seat 41b.
The oil in the oil chamber 4 from the suction port 39 to the cylinder recess.
The suction is made into the inside 33 (FIG. 7B). On the other hand, piston part 3
7 during the retreat operation, the volume of the cylinder recess 33 becomes small.
To pressurize the oil in the cylinder recess 33,
The stop valve 42 is pressed in the direction in which the ball valve 42a closes to the valve seat 41b.
The valve is not opened and remains closed (FIG. 7 (a)).
Therefore, the pressurized oil is supplied to the discharge section 35 as described later.
Discharged. The output cylinder device 3 communicates with the discharge section 35
The cylinder chamber 50 serving as the discharge chamber of the cylinder device 2
Output piston 5 inserted into the cylinder chamber 50
One. The output piston 51 is the inner circumference of the cylinder chamber 50.
A contact portion 55 slidably contacting the surface;
And a driving piece 56. Of the outer peripheral surface of the contact portion 55
An O-ring 57 is provided in the circumferential groove, and an inner circumferential surface of the cylinder chamber 50 is provided.
And liquid tight. The output piston 51 is a cylinder chamber
50 is urged by a spring 90 in a direction to reduce the internal volume.
I have. The spring 90 of the embodiment is a coil spring,
A coil spring is passed through the piece 56 and one end is locked to the contact portion 55
Crimping die 12 with the other end mounted in cylinder chamber 50
0, and the output piston 51 is moved to the cylinder device 2 side.
It is energizing. The oil is applied to the bottom wall 50a of the cylinder chamber 50.
The end of the chamber 4 on the side of the cylinder device 2 is attached. Discharge unit 3
5 extends over the cylinder device 2 and the output cylinder device 3
The end of the discharge section 35 communicates with the cylinder chamber 50
ing. The first check valve 34 is supported at one end of the discharge section 35.
And a discharge spring 35 supported by the tip of the spring
A valve abutting the valve seat at the boundary with the passage 44, for example, a ball valve.
ing. Therefore, the cylinder recess of the cylinder device 2
When the piston 33 is compressed by the piston portion 37, the pressure of the communication portion 44 is increased.
Rises and the ball valve is pushed from the valve seat to open the cylinder
33 oil enters the cylinder chamber 50 through the discharge portion 35
The oil flows and the oil accumulates in the cylinder chamber 50. As above
The output piston 51 of the output cylinder device 3 has a cylinder chamber.
Since the spring 90 is provided in the direction of compressing 50,
Normally, the output piston 51 is retracted into the cylinder chamber 50.
Reciprocating motion of the piston portion 37 of the cylinder device 2
It is pressed by the oil pressurized by the
As a result, the output piston 51 advances outward. Oil on the other hand
The direction of flow is such that the ball valve of the first check valve 34
It is blocked because it is pressed more closely. As described above, the swash plate 7, the piston 37
And the cylinder 30 are arranged in the oil chamber 4 and
The chamber 4 is connected to the oil tank 100 and the cylinder chamber 50
Is an oil tank via a release valve 70 and a pressure reducing valve 60.
Connected to the network 100. As shown in FIGS. 5 and 9, the cylinder chamber
A pressure reducing valve 60 is provided in the bottom wall 50 a of the device 50. This
The pressure reducing valve 60 has a bottomed hole 61 opening on the side surface of the bottom wall 50a.
And a thin portion communicating with the inside of the cylinder chamber 50 at the bottom of the bottomed hole 61.
Communication passage 62 having a diameter and communication passage 6 inserted into bottomed hole 61.
Valve body 63 of the third check valve having a conical portion closing the outlet of the second valve 63
A spring 64 for pressing the valve body 63 toward a valve seat;
A screw to be screwed into the female screw formed on the opening side of the bottomed hole 61
And a pressure adjusting section 65 for supporting the spring.
You. The spring of the spring 64 depends on the screwing amount of the pressure adjusting section 65.
By changing the pressure, the pressure for pressing the valve body 63 against the valve seat is adjusted,
Pressure with oil pressure in communication passage 62 communicating with cylinder chamber 50
The position where the force becomes the same, that is, the valve body 63 is pressed by the oil pressure
The pressure for reducing the pressure of the open cylinder chamber 50 is adjusted. Pressure
The force adjuster 65 is provided with an O-ring 66
Prevents leaks. 67 is formed on the side of the bottomed hole 61
Exit. As shown in FIG. 6 and FIG.
A release valve 70 is provided on the bottom wall 50 a of the chamber 50. Re
The lease valve 70 communicates with the cylinder chamber 50 at a communication portion 71.
A fourth non-return valve chamber 72 and an end of the valve chamber 72
And an operation chamber 74 communicating with a communication passage 73 having a diameter.
An example of a valve that closes a communication passage 73 that communicates with an operation room 74 inside 72
For example, a ball valve 75 is pressed by a spring 76. The operation room 74
An opening is formed on the outer surface of the bottom wall 50a.
The end is protruded and urged to protrude to the outside by a spring 78
Then, the ball valve 75 is passed through the communication passage 73 to the inner end of the operation piece 77.
Is provided. 80 is an operation room 74
Is an oil outlet formed on the side of the. Exit of cylinder device 3
When retracting the force piston 51, the operation piece 77 is pressed.
Push the ball valve 75 open against the spring 76 with the push piece 79
As a result, the oil in the cylinder chamber 50
73 and the operation chamber 74, and the cylinder chamber from the oil outlet 80
Flowing outside. As shown in FIG. 4 again, the cylinder chamber 50
The oil tank 100 adjacent to the oil chamber 4 is provided on the bottom wall 50a.
, And the oil tank 100 and the oil inside the bottom wall 50a.
A communication path 101 communicating with the four chambers is formed, and an oil tank is formed.
The filter 103 is attached to the outlet on the side of the filter 100.
The outlet 67 of the bottomed hole 61 of the pressure reducing valve 60 and the release
The oil outlet 80 of the operation chamber 74 of the valve 70 is connected to the oil tank 100
Contact Oil tank 100 is a flexible member
Formed. The operation of this crimping terminal caulking device will be described.
I will tell. FIGS. 4 and 8 show movements during pressurization for terminal crimping.
The output piston 51 of the output cylinder device 3 is
The cylinder chamber 50 is retracted by the spring 90 so that the cylinder space 50 has the minimum space.
In a state where the pace has been reached, the oil pressure of the cylinder chamber 50 is
Power is also at a minimum. At this time, the spring 8 of the swash plate 7
The swash plate 7 is pressed against the short stopper 26.
ing. When the motor 130 rotates, the rotating shaft 5 and the tilt
The plate 7 rotates, and the piston portion 37 slides on the sliding surface 7a,
The piston part 37 reciprocates in the axial direction. This reciprocating operation
, The piston portion 37 is
When the swash plate 71 is moved forward by the
Since the internal volume of the concave portion 33 increases,
Is sucked into the cylinder recess 33 and the swash plate 7
When the ton portion 37 is retracted into the cylinder recess 33, the cylinder
The internal volume in the recess 33 is compressed. When this compression is fixed
In the suction port 39 side for the second check valve 42
Push back and open the first check valve 34 of the discharge section 35 without backflow.
The oil is pumped into the cylinder chamber 50. One rotation of the swash plate 7
Causes the piston part 37 to reciprocate once, but the inclination angle of the swash plate 7 is
At the time of the reciprocating stroke of the piston portion 37
Is also the largest, and therefore the oil
The pumping amount also becomes maximum. Oil is pumped from piston part 37
The inside of the cylinder chamber 50 in the output cylinder device 3 is
The next oil increases the internal pressure of the cylinder
The stone 51 moves forward. For this reason, the crimping dies 12
The 0 convex mold 122 moves closer to the concave mold 121. FIGS. 5 and 9 show a caulking for terminal crimping.
To keep the maximum pressure from pressurized operation to caulking complete
Shows the operation up to the pressure valve.
When tightening starts, load is applied to the output piston 51,
The oil is pressurized by the load and the first check valve 34 of the discharge section 35 is pressed.
Press. Therefore, the hydraulic pressure for pushing and opening the first check valve 34 is reduced.
A load is applied to the discharge operation of the piston portion 37 to be generated,
A load is applied to the spring 8 of the swash plate 7 that pushes the piston portion 37
Thus, the spring 8 is elastically deformed. As a result,
The oil pressure exceeding the spring force of the spring 8 of the cylinder chamber 50
The spring 8 is compressed and deformed accordingly, and the inclination angle of the swash plate 7 is changed.
The degree approaches the direction perpendicular to the rotation axis 5 and the spring 8 and oil pressure
It will have a tilt angle with a balanced force. Also
Since the ston load is applied at the time of discharge, the swash plate 7
When the ston portion 37 is pushed in, the swash plate 7 is applied to the
Since the spring 8 is incorporated in the device, it is efficient. Fixie
When the angle of the swash plate 7 with respect to the
The reciprocating stroke of the
The load on the data 130 is also reduced. And the maximum load
At this time, the swash plate 7 is locked by the long stopper 25,
An inclination (for example, about
1.5 °). In this case, the operation of the pressure reducing valve 60 causes the
The pressure in the chamber 50 is kept constant. Movement of pressure reducing valve 60
The operation is adjusted by the pressure adjustment unit 65.
It is set to the maximum pressure for caulking. Therefore, crimp
The terminal is swaged securely, but the oil
The pressure reducing valve 60 opens for the pressure of
There is no additional crimping force. The maximum load
The swash plate 7 so that the piston 37 does not reciprocate.
Is also good. FIGS. 6 and 10 show the release operation.
When the operating piece 77 is pushed, the release valve 70 is pushed and opens,
The oil in the cylinder chamber 50 flows out of the cylinder chamber 50
Pressure drops. Output piston 51 due to pressure drop
Spring 90 returns to push output piston 51 back,
As a result, the oil is pushed out and the spring 8 of the swash plate 7
The swash plate 7 is again tilted to the maximum angle.
The stopper 26 is inclined and locked to the short stopper 26. When the motor 130 is kept operating,
Since the output piston 51 reciprocates in this process,
It is possible to crimp the crimp terminal
Even if the motor 130 is stopped every time the ton 51 retreats,
Good. The circulation of the oil will be described. Oil is
Filled with oil chamber 4 and oil tank 100
Through the communication passage 101 and the filter 103.
ing. The oil tank 100 has a capacity of, for example, about 55 cc.
A flexible tank as described above in volume. Oil chamber 4
Oil is released from the cylinder by the discharge of the piston part 37
33, the oil tank 100
To the oil chamber 4 through the filter 103 and the communication passage 101.
Oil flows in, oil tank 100 is flexible
Therefore, they contract as shown in FIGS. Cylinder recess
The oil sucked into the unit 33 is sequentially output from the output cylinder device 3.
Is sent to the cylinder chamber 50 by the movement of the piston 51.
As a result, the volume of the cylinder chamber 50 increases. Cylinder chamber 50
When the pressure is reduced, the pressure reducing valve 60 opens and the oil becomes oily.
Tank 100 and release valve when released
70 is opened and returned to the oil tank 100. Like this
And the oil circulates. In the present invention, the fluid is less than oil.
It may be outside. In the embodiment, a crimping tool will be described as an example.
However, other hydraulic tools such as wire and bolt cutting devices
It may be. [0044] According to the hydraulic tool of the first aspect, the motor
, Pump, output cylinder device, and work part on a straight line
Place the oil tank on the body opposite the grip
Because it is located above
As the il tank does not protrude as in the past,
Of the oil tank with the back of the hand when holding the body.
The balance of the grip
It is small, so you can work comfortably for a long time
it can.Power switch with switch handle
Is stored in the grip section, and
Switch handle and lily
The operability of the button is improved. In addition, the lever can rotate freely
Between the rotation fulcrum and the operating part of the release valve.
Is smaller than the distance between the pivot point and the release button.
Leverage the lever with the light operating force of the release button.
The operation part of the lease valve can be reliably operated. [0045] [0046]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a state where a tool main body according to an embodiment of the present invention is divided into two parts. FIG. 2 is an explanatory diagram showing a relationship between a switch handle, a release button, a lever, and the like, as viewed from a line AA of FIG. 1; FIG. 3 is a diagram illustrating the operation of a release button and a switch handle, as viewed from the line BB in FIG. 2; FIG. 4 is a partial cross-sectional view showing an operation state when the hydraulic tool is pressurized. FIG. 5 is a partial cross-sectional view illustrating a state during a pressurizing operation and a state during a pressure reducing valve operation. FIG. 6 is a partial cross-sectional view of a state during a release operation. FIG. 7 is an enlarged sectional view showing a check valve of a piston portion;
(A) is a state where the check valve is closed, and (b) is a state where the check valve is open. FIG. 8 is an enlarged partial cross-sectional view of a main part explaining the operation of the swash plate. FIG. 9 is an enlarged partial cross-sectional view of main parts during the pressurizing operation and the pressure reducing valve operation. FIG. 10 is an enlarged partial cross-sectional view of a main part in a state during a release operation. FIG. 11 is an explanatory view of the cylinder device as viewed in the axial direction. [Description of Signs] 3 Output cylinder device 4 Oil chamber 5 Rotary shaft 6 Support shaft 7 Swash plate 8 Spring 50 Cylinder chamber 51 Output piston 60 Pressure reducing valve 70 Release valve 77 Release valve operating piece 90 Spring 100 Oil tank 120 Crimping die 130 Motor 140 Hydraulic pump 150 Tool body 151 Body 152 Grip 153 Release button 155 Lever 155c Support shaft 156 Switch handle 157 Power switch 158 Operation restricting part 159 Second operation restricting part

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-8-150576 (JP, A) WO 99/019947 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B30B 1/32 B25F 5/00 H01R 43/04

Claims (1)

(57) [Claim 1] A motor, a hydraulic pump driven by the motor, an output cylinder device having an output piston connected to the hydraulic pump and driven to advance, and the output piston A hydraulic tool having a workpiece portion connected and advanced to be driven coaxially disposed on a body portion of the tool body and a grip portion protruding from the body portion, the hydraulic tool being connected to a cylinder chamber of the output cylinder device. An oil tank, a release valve provided in the cylinder chamber of the output cylinder device for discharging pressurized fluid in the cylinder chamber, and a release valve provided near the grip portion protruding from the body of the tool body. is provided with a release button for operating the release valve, the operation portion of the oil tank and the release valve is disposed on the opposite side to the grip portion of the barrel, The operating portion of the serial release valve and with said release button is connected via a lever, the grip power switch with switch handle
And release it near the switch handle.
Button, the lever is pivotally supported pivotally, and its pivot point is
The distance between the operating part of the release valve and the pivot
Hydraulic tool smaller than the distance between the lease button .