JP2004082258A - Automatic lubricant supplying device for impulse tool, and impact tool having the same device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously supply lubricant to a sliding part of a chisel while an impact piston is hammering the chisel to avoid a danger of a lack of lubricant. <P>SOLUTION: The automatic lubricant supplying device is used for the impact tool 2 which has a chisel 4 arranged at a lower end of a cylinder 3 and the impact piston 5 arranged inside the cylinder 3. The automatic lubricant supplying device is provided with a lubricant supplying means for supplying the lubricant to the impact tool by utilizing the fluctuation of air pressure inside the cylinder 3 while the impact piston 5 is hammering the chisel 4. The lubricant supplying means has a lubricant delivery piston 11 which reciprocates according to the fluctuation of the air pressure. The lubricant is delivered by the reciprocation of the piston 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant automatic supply device for an impact power tool, which automatically supplies a lubricant to a sliding portion of a chisel of the impact power tool during operation of the impact power tool such as a hydraulic breaker. Further, the present invention relates to an impact power tool provided with the device.
[0002]
[Prior art]
2. Description of the Related Art As a conventional automatic lubricant supply device for impact moving tools, there is one disclosed in, for example, Japanese Patent No. 2918061. This automatic lubricant supply device includes a lubricant tank, a lubricant chamber in which lubricant sent from the lubricant tank is stored, a lubricant delivery piston that performs a stroke each time pressurization is performed for driving an impact tool. And the lubricant in the lubricant chamber is supplied to the sliding portion of the chisel in the impact power tool by the stroke of the delivery piston.
[0003]
[Problems to be solved by the invention]
By the way, once the striking piston is pressurized by the pressure oil, the striking piston hits the chisel many times until the pressure is released. In other words, in the configuration in which the lubricant is sent out by the piston that performs a stroke each time pressurization is performed to drive the striking piston as in the above-described conventional device, the lubricant is sent out only when the striking piston first strikes the chisel. Become. For this reason, in the above-mentioned conventional apparatus, when continuous impact is performed for a long time with the impact power tool, the lubricant may run out. In order to prevent this, a complicated control circuit needs to be provided.
[0004]
An object of the present invention is to solve the above-described problem, and while the striking piston is striking the chisel, the lubricant can be continuously fed while the striking piston is striking, and the danger of running out of the lubricant can be achieved. It is an object of the present invention to provide a lubricant-free automatic supply device for impact power tools that does not have any.
[0005]
Means for Solving the Problems and Effects of the Invention
In order to solve the above-mentioned problem, the present invention provides an automatic power supply device for an impact moving tool, which comprises a chisel provided at a lower end of a cylinder, and a striking piston which is vertically movable inside the cylinder. An automatic lubricant supply device to be used, comprising a lubricant supply means for sending a lubricant to a sliding portion of a chisel by utilizing air pressure fluctuation in a cylinder generated when a striking piston strikes the chisel. is there.
[0006]
This device sends out the lubricant using the air pressure fluctuation generated in the stroke of the striking piston hitting the chisel, so that the striking piston can send lubricant every stroke of striking the chisel, and the lubricant runs out during the striking. There is no danger of occurring.
[0007]
In the above device, the lubricant supply means may include a lubricant delivery piston that performs a stroke by the air pressure fluctuation, and the lubricant is delivered by the stroke of the delivery piston.
[0008]
A delivery piston drive space for transmitting the air pressure fluctuation to the lubricant delivery piston; and a pressure transmission pipe for communicating the air pressure change inside the cylinder to the delivery piston drive space by communicating the inside of the delivery piston drive space with the inside of the cylinder. It may be equipped with.
[0009]
Note that the above device may include an amplifier to amplify air pressure fluctuations.
[0010]
In addition, the automatic lubricant supply device for impact power tools of another invention,
A lubricant automatic supply device used for an impact power tool having a chisel provided at the lower end of a cylinder and a striking piston arranged vertically movable inside the cylinder, wherein the striking piston strikes the chisel. It is provided with a lubricant supply means for sending the lubricant to the sliding portion of the chisel by using the generated vibration.
[0011]
This device sends the lubricant using the vibration generated when the striking piston hits the chisel, so that the lubricant can be continuously sent to the sliding part of the chisel while the striking piston hits the chisel. There is no danger of running out of lubricant during impact.
[0012]
In the above device, it is preferable that the supply unit includes a vibration amplification unit such as a pendulum. This is because the lubricant can be reliably sent out even when the vibration is small. Further, it is preferable that a lubricant delivery piston operated by vibration is provided, and the lubricant is delivered by a stroke of the delivery piston. It should be noted that a lubricant tank may be provided both when using air pressure fluctuation and when using vibration.
[0013]
The impact power tool having the automatic lubricant supply device described above does not cause seizure or the like during operation.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
First, an automatic lubricant supply device for an impact power tool according to a first embodiment of the present invention and an impact power tool provided with the device will be described with reference to FIGS. 1 and 2.
[0015]
FIG. 1 shows a connection between the automatic lubricant supply device 1 and the impact moving tool 2 and a schematic configuration of the automatic lubricant supply device 1 and the impact moving tool 2. The impact moving tool 2 includes a chisel 4 provided at the lower end of the cylinder 3 so as to be able to advance and retreat, a striking piston 5 arranged inside the cylinder 3 so as to be movable up and down, and a cylinder 3 at a position where the striking piston 5 strikes the chisel 4. And a hitting chamber 6 formed therein.
[0016]
In the striking chamber 6, when the striking piston 5 strikes the chisel 4, the air pressure in the striking chamber 6 increases due to the lowering of the striking piston 5, and the air pressure in the striking chamber 6 decreases as the striking piston 5 rises. Pressure fluctuation occurs. A through hole 3 a for transmitting air pressure fluctuation in the impact chamber 6 to the automatic lubricant supply device 1 is formed in a portion of the cylinder 3 that forms a side wall of the impact chamber 6. Further, the cylinder 3 is provided with a through hole 3b for supplying a lubricant to the sliding portion of the chisel 4. The through hole 3 a and the automatic supply device 1 are connected by a pressure transmission pipe 7, and the through hole 3 b and the automatic supply device 1 are connected by a lubricant supply pipe 8.
[0017]
In the figure, the automatic supply device 1 and the impact power tool 2 are located apart from each other and are connected by a relatively long pressure transmission pipe 7 and a lubricant supply pipe 8, but the automatic supply device is not shown. 1 is preferably provided near the impact moving tool 2.
[0018]
Next, the automatic lubricant supply device 1 will be described. FIG. 2 shows a specific configuration of the automatic lubricant supply device 1. The lubricant supply device 1 includes a lubricant tank 9 and a block-shaped device main body 14. In the following description, the left and right in FIG.
[0019]
The tank 9 includes a cylindrical tank body 9a having upper and lower ends opened, a lubricant extruding plate 9b disposed in the tank body 9a, a lid 9c having a closed upper end opening of the tank body 9a, and a lid 9c. It includes a rod 9e movably penetrating and having a tip fixed to the extrusion plate 9b, and a spring 9d disposed between the extrusion plate 9b and the lid 9c.
[0020]
In this tank 9, the pushing plate 9b is urged to the lower end side by a spring 9d, and the pushing plate 9b moves up and down in the tank main body 9a while keeping parallel to the lid 9c. The rod 9e assists the spring 9d when the plate 9b moves inside the tank body 9a, but is not always necessary and can be omitted.
[0021]
A male screw is formed at the lower end of the tank main body 9a, and the male screw is screwed to a female screw of the device main body portion 14 described later in detail. The lubricant is stored in a portion below the plate 9b in the tank body 9a.
[0022]
The block-shaped device main body portion 14 has a substantially rectangular cross section, and the male screw of the tank main body portion 9a is tightly screwed into the female screw formed at the upper portion, so that the tank 9 and the device main body portion 14 are integrated. Inside the main body portion 14, a substantially tank-side flow path 10a communicating with the inside of the tank 9 and a horizontal supply pipe-side flow path 10b orthogonal to the tank-side flow path 10a and communicating with the lubricant supply pipe 8 are formed. A letter-shaped lubricant flow path 10 is formed.
[0023]
Further, a hollow portion 17 for accommodating a lubricant delivery piston described later is formed in the apparatus main body portion 14. The hollow portion 17 communicates with the lubricant flow channel 10 in a portion orthogonal to the flow channels 10a and 10b and extends in a direction opposite to the supply pipe-side flow channel 10b. The hollow portion 17 is composed of a right small diameter portion 17a communicating with the lubricant flow path 10 and a left large diameter portion 17b larger in diameter than the small diameter portion 17a. Note that the left end opening of the large diameter portion 17b is closed by a lid 15 having a small hole.
[0024]
The lubricant delivery piston 11 is arranged in the hollow portion 17. The lubricant delivery piston 11 includes a main body 11a having the same diameter as the inside of the small diameter portion 17a, and a pressure receiving portion 11b having the same diameter as the large diameter portion 17b. The pressure receiving portion 11b is located inside the large diameter portion 17b. 11a is inserted into the small diameter portion 17a.
[0025]
A spring 16 is arranged between the pressure receiving portion 11b and the lid 15. When the spring 16 has a natural length, a delivery piston driving space 17c is formed between the pressure receiving portion 11b of the delivery piston 11 and the right end of the large diameter portion 17b. The pressure transmission pipe 7 is connected to the delivery piston drive space 17c. Further, in the above-described state, the tip of the delivery piston 11 is configured to protrude from an orthogonal portion between the tank-side flow path 10a and the supply pipe-side flow path 10b.
[0026]
Although not shown in FIG. 2, a check valve 12 is disposed in the tank side flow path 10a and a check valve 13 is disposed in the supply pipe side flow path 8 as shown in FIG. Have been.
[0027]
The automatic lubricant supply device 1 configured as described above operates as follows.
[0028]
When the striking piston 5 descends to strike the chisel 4, the air pressure in the striking chamber 6 increases. This pressure increase is transmitted to the delivery piston drive space 17c of the automatic lubricant supply device 1 by the pressure transmission pipe 7, and the pressure in the drive space 17c also increases. When the pressure in the delivery piston drive space 17c rises, the delivery piston 11 moves to the left against the force of the spring 16, and the right end of the piston 11, which is located at a right angle to the flow paths 10a and 10b, enters the small diameter portion 17a. Moving. Then, the pushing plate 9b is pushed downward by the spring 9d in the tank 9, and the lubricant in the tank 9 is pushed out to the lubricant flow path 10.
[0029]
After the striking piston 5 hits the chisel 4, after the striking piston 5 rises, the pressure in the striking chamber 6 decreases, and the pressure in the sending piston drive space 17c also decreases, so that the delivery piston 11 is pushed to the right by the spring 16. The right end of the piston 11 located in the small diameter portion 17a projects to the orthogonal portion of the flow passages 10a and 10b to send the lubricant to the sliding portion of the chisel 4.
[0030]
The above operation is repeated, and each time the striking piston 5 strikes the chisel 4, the delivery piston 11 performs a stroke and sends the lubricant to the sliding portion of the chisel 4.
[0031]
Next, another embodiment will be described with reference to FIG. In the following description, the same members as those shown in FIGS. 1 and 2 and the corresponding members are denoted by the same reference numerals, and description thereof will be omitted.
[0032]
In the automatic lubricant supply device 20 shown in FIG. 3, a lubricant chamber 22 for storing lubricant is formed in the lubricant passage 10 in the device main body 20. The hollow portion 21 accommodating the delivery piston 11 has a large-diameter portion 21a having substantially the same diameter as the pressure-receiving portion 11b of the piston 11, a medium-diameter portion 21b having a diameter smaller than the pressure-receiving portion 11b and larger than the main-body portion 11a, and a main-body portion 11a. The small-diameter portion 21 c has substantially the same diameter, and the small-diameter portion 21 c communicates with the lubricant chamber 22.
[0033]
A spring 23 is provided in a portion of the hollow portion 21 below the pressure receiving portion 11b of the piston 11. When the spring 23 is in a natural length state, a delivery piston driving space 21d is formed between the pressure receiving portion 11b of the delivery piston 11 and the upper end of the large diameter portion 21a, and the lower end of the delivery piston 11 is provided in the lubricant chamber. 22 so as to protrude. The pressure transmission pipe 7 is connected to the delivery piston drive space 21d to be in an open state.
[0034]
The automatic lubricant supply device 20 further includes a delivery piston stroke amount adjusting means having the following configuration. The stroke adjusting means includes a stud bolt 24 having a lower part protruding into the pressure space 21d and abutting on the piston 11 at the top dead center position and an upper part protruding out of the pressure space 21d, and a nut 25 screwed to the upper part of the bolt 24. And The stroke of the piston 11 is changed by rotating the nut 25, changing the amount of protrusion of the stud bolt 24 into the pressure space 21d, and changing the top dead center position of the delivery piston 11.
[0035]
The automatic lubricant supply device 20 configured as described above operates as follows.
[0036]
When the pressure in the delivery piston drive space 21d rises, the delivery piston 11 moves downward against the force of the spring 23, and the lubricant in the lubricant chamber 22 passes through the lubricant supply pipe 8 to the impact moving tool 2. Sent. When the pressure in the delivery piston drive space 21d decreases, the delivery piston 11 is moved upward by the spring 23, and the lubricant in the tank 9 is delivered to the lubricant chamber 22.
[0037]
Next, still another embodiment of the present invention will be described with reference to FIG.
[0038]
In the automatic lubricant supply device 26, the hollow portion 27 is composed of a large diameter portion 27a and a small diameter portion 27b, and the pressure transmission pipe 7 is connected to the large diameter portion 27a of the hollow portion 27 that houses the delivery piston 11. ing. Further, the lubricant is stored in the lower portion of the small diameter portion 27b, and the tank 9 is not provided.
[0039]
In the automatic supply device 26, when the pressure in the impact chamber 6 increases, the piston 11 is pushed downward, and the lubricant stored in the lower portion of the small diameter portion 27b is sent to the impact moving tool 2 by the piston 11.
[0040]
Next, still another embodiment of the present invention will be described with reference to FIG. The automatic supply device 30 includes a pendulum 31 connected to an upper end of the delivery piston 11. The pendulum 31 swings due to the impact when the striking piston 5 strikes the chisel 4, and the piston 11 makes a vertical stroke with the swing of the pendulum 31. The lubricant is sent from the tank 9 by the stroke of the piston 11, and the lubricant is sent to the impact power tool 2.
[0041]
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a first automatic lubricant supply device of the present invention and an impact power tool to which the device is applied.
FIG. 2 is a sectional view of the automatic supply device.
FIG. 3 is a diagram showing a schematic configuration of a second automatic lubricant supply device of the present invention and an impact power tool to which the same device is applied.
FIG. 4 is a view showing a schematic configuration of a third automatic lubricant supply device of the present invention and an impact power tool to which the same device is applied.
FIG. 5 is a diagram showing a schematic configuration of a fourth automatic lubricant supply device of the present invention and an impact power tool to which the same device is applied.
[Explanation of symbols]
1, 20, 26, 30 Automatic lubricant supply device 2 Impact power tool 3 Cylinder 4 Chisel 5 Impact piston 7 Pressure transmission pipe 9 Lubricant tank 11, 32 Lubricant delivery piston 17c, 21d Delivery piston drive space 31 Pendulum

Claims (4)

A lubricant automatic supply device used for an impact power tool having a chisel provided at a lower end of a cylinder and a striking piston arranged vertically movable inside the cylinder,
An automatic supply of lubricant for an impact power tool, comprising: a lubricant supply means for sending a lubricant to a sliding portion of the chisel by utilizing air pressure fluctuation in the cylinder generated when the impact piston strikes the chisel. apparatus. 2. The lubrication for an impact power tool according to claim 1, wherein the lubricant supply means includes a lubricant delivery piston that performs a stroke by the air pressure fluctuation, and the lubricant is delivered by a stroke of the delivery piston. Automatic agent supply device. A lubricant automatic supply device used for an impact power tool having a chisel provided at a lower end of a cylinder and a striking piston arranged vertically movable inside the cylinder,
An automatic lubricant supply device for an impact power tool, comprising: a lubricant supply unit that sends a lubricant to a sliding portion of the chisel by using vibration generated when the impact piston strikes the chisel. An impact power tool comprising the automatic lubricant supply device according to claim 1.

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