JP2009160665A - Combustion type driving machine - Google Patents

Abstract

To provide a combustion type driving machine capable of preventing outflow of lubricating oil contained in fuel gas from an exhaust port.
SOLUTION: A housing 2, a gas cylinder 3 accommodated in the housing 2, a cylinder head 13 fixed to one end of the housing 2, and a combustion chamber frame 12 forming a combustion chamber 26 together with the cylinder head 13. A cylinder 21 that slidably guides the combustion chamber frame 12, a piston 25 that is slidably fitted in the cylinder 21, and a driver blade 27 that moves together with the piston 25. Combustion in which the piston 25 and the driver blade 27 are moved by combustion of the fuel gas injected into the chamber 26 to drive the stopper into the material to be driven, and the combustion gas remaining in the combustion chamber 26 is discharged into the atmosphere through the exhaust path. In the type nailing machine (combustion type driving machine) 1, an oil permeation material 28 is provided in a part of the exhaust path.
[Selection] Figure 1

Description

  The present invention relates to a combustion type driving machine for generating power for driving a piston by igniting and burning an air-fuel mixture of combustible gas and air, and driving a stopper such as a nail, scissors or staple by the piston. It is.

  A portable combustion type driving machine for driving a stopper such as a nail into a material to be driven such as wood is known (for example, see Patent Document 1). In such a combustion type driving machine, a head cover is attached to a cylinder head that closes an opening of the housing, a plurality of intake ports are formed in the head cover, and a combustion chamber frame and a housing that are movably disposed in the housing A cylinder that guides the combustion chamber frame is fixed in the housing, and a piston that is slidably fitted in the cylinder, the cylinder head, and the combustion chamber frame are connected to a push lever provided at a lower portion. A fan is provided in the combustion chamber defined by the above, and a motor for rotationally driving the fan is held by the cylinder head.

  A gas cylinder is accommodated in the housing, and the gas cylinder is filled with a liquefied gas that is injected as a combustible gas into the combustion chamber through an injection passage formed in the cylinder head. Further, a magazine is mounted at the end of the housing, and a stopper such as a nail is loaded inside the magazine.

  Thus, when the push lever is pressed against the workpiece, liquefied gas is injected from the gas cylinder into the combustion chamber in a state where the combustion chamber is defined, and air and combustible gas are driven by a fan that is driven to rotate by a motor in the combustion chamber. When the trigger switch is turned on in this state, the air-fuel mixture is ignited and combusted in the combustion chamber by ignition by the spark plug, and the piston is driven by the high pressure generated in the combustion chamber at that time, and the cylinder is driven at high speed. Therefore, a stopper such as a nail is driven into a material to be driven such as wood by a driver blade connected to the piston.

  As described above, when the stopper is driven into the driven material, the combustion gas is discharged out of the cylinder through the plurality of exhaust holes formed in the cylinder. Here, a check valve is provided in each exhaust hole, and the check valve is closed when combustion gas is discharged out of the cylinder and the pressure in the cylinder and the combustion chamber becomes atmospheric pressure.

  Then, when the high-temperature combustion gas remaining in the combustion chamber is rapidly cooled and the pressure in the combustion chamber is reduced to below atmospheric pressure (thermal vacuum), the piston and the driver blade are pulled back to the initial top dead center position.

  After that, when the trigger pulling operation is released, the trigger switch is turned off, the combustion type driving machine is lifted and the push lever is separated from the driven material, the push lever and the combustion chamber frame are moved by the biasing force of the compression coil spring. Move downward to return to the original initial position.

Further, when the combustion chamber frame moves down and returns to the original initial position, the sealed state of the combustion chamber is released, and the fan rotates in this state to generate a flow in the combustion chamber. Air in the atmosphere is sucked into the combustion chamber through the intake ports formed in the heads, and the combustion gas remaining in the combustion chamber is lowered by this air through the exhaust path between the combustion chamber frame and the cylinder. It flows and is discharged into the atmosphere from an outlet formed in the housing.
JP 2006-061998 A

  By the way, the gas injected into the combustion chamber from the gas cylinder contains lubricating oil so that the combustion chamber frame can slide smoothly in addition to the combustible gas that generates combustion explosion energy. Here, the component of the lubricating oil is isopropylene glycol or the like, and the lubricating oil is not burned but is contained in the combustion gas. For this reason, the lubricating oil contained in the combustion gas adheres to and accumulates in the exhaust path, and when the number of times of use of the gas cylinder, that is, the number of times of use of the combustion type driving machine is increased, the lubricating oil accumulated in the exhaust path is accumulated in the housing. There arises a problem of flowing out of the formed exhaust port.

  Combustion-type driving machines are used not only for general building frame work, but also for finishing interior work, but when used for general building frame work, the frame part is then covered with an outer wall material. Therefore, the scattering of lubricating oil is not regarded as a problem.

  However, when the combustion type driving machine is used for finishing the interior of a house or for assembling furniture, splashing of lubricating oil becomes a problem because the finish is attached to a decorative plate that places importance on the finish. .

  The present invention has been made in view of the above problems, and an object thereof is to provide a combustion type driving machine capable of preventing outflow of lubricating oil contained in fuel gas from an exhaust port. .

  In order to achieve the above object, the invention according to claim 1 forms a combustion chamber together with a housing, a gas cylinder housed in the housing, a cylinder head fixed to one end of the housing, and the cylinder head. A combustion chamber frame, a cylinder that slidably guides the combustion chamber frame, a piston slidably inserted in the cylinder, and a driver blade that moves together with the piston; Combustion-type striking, in which the piston and the driver blade are moved by combustion of the fuel gas injected into the cylinder to drive a stopper into the material to be driven, and the combustion gas remaining in the combustion chamber is discharged to the atmosphere through an exhaust path. In the filling machine, an oil permeation material is provided in a part of the exhaust path.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the oil-permeable material is attached to an inner peripheral surface of the housing.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the oil penetrating material is attached to an outer peripheral surface of the cylinder.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the oil-permeable material is attached to the inner peripheral surface of the housing and the outer peripheral surface of the cylinder so as to face each other, and combustion gas is generated between the two oil-permeable materials. A gap for passing is formed.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the oil penetrating material is attached to an inner peripheral surface of the combustion chamber frame.

According to the present invention, since the oil permeation material is provided in a part of the exhaust path, the lubricant contained in the combustion gas is accumulated in the exhaust path, and the accumulated lubricant is, for example, the outer peripheral surface of the cylinder or the inner periphery of the housing. Even if it moves along the surface, the lubricating oil penetrates into the oil-permeable material and is absorbed, so that the lubricating oil is surely prevented from flowing out from the exhaust opening opened in the lower portion of the housing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and FIG. 2 are broken side views of a combustion type nailing machine as an embodiment of the combustion type driving machine according to the present invention, and FIG. 3 is an enlarged detail view of part A of FIG.

  As shown in FIG. 1, the combustion nailing machine 1 according to the present embodiment includes a housing 2 constituting a main body. The housing 2 includes a main housing portion 2A and a longitudinal direction of the main housing portion 2A. The cylinder chamber portion 2B is erected on the side portion of the main housing portion 2A along the vertical direction of FIG.

  A gas cylinder 3 filled with a combustible gas containing lubricating oil is detachably accommodated in the cylinder chamber portion 2B of the housing 2, and a metering valve 4 is provided above the gas cylinder 3. A handle 5 is integrally extended from the cylinder chamber 2B. The handle 5 is provided with a trigger 6 and a trigger switch 7 that is turned on when the trigger 6 is pulled, and the battery 8 is detachable. It is installed.

  The lower end of the housing 2 corresponds to a magazine 9 loaded with nails (not shown), a nose 10 for feeding and guiding the nails loaded in the magazine 9, and a nail set position of the nose 10. A push lever 11 supported so as to be movable up and down is provided. The push lever 11 is connected to a cylindrical combustion chamber frame 12 which is arranged on the upper part of the main housing 2A of the housing 2 so as to be movable up and down. Here, when the tip of the push lever 11 is pressed against a not-shown workpiece such as wood and presses the entire housing 2 in the direction of the workpiece (downward in FIG. 1), the upper portion of the push lever 11 Is configured to be retractable into the main housing portion 2A.

  On the other hand, a cylinder head 13 for closing the upper end opening of the main housing portion 2A is fixed to the upper end of the main housing portion 2A of the housing 2, and a head cover 14 is attached to the upper portion of the cylinder head 13. ing. The head cover 14 is formed with a plurality of air inlets 15.

  A motor mount 17 that accommodates and holds the motor 16 is elastically supported by a spring 18 at the center of the cylinder head 13, and a fan 19 is provided at the lower end of an output shaft (motor shaft) 16 a that extends vertically downward from the motor 16. It is bound. Although not shown, a plurality of air inlets are formed around the motor mount 17 of the cylinder head 13. The cylinder head 13 is provided with a spark plug (not shown) that performs an ignition operation when the trigger switch 7 is turned on.

  Further, a fuel passage 20 is formed on the cylinder chamber 2B side of the cylinder head 13, and one end of the fuel passage 20 is opened as an injection port on the lower end surface of the cylinder head 13, and the fuel passage 20 The other end is connected to the gas cylinder 3.

  By the way, the combustion chamber frame 12 is movable in the longitudinal direction (vertical direction in FIG. 1) of the main housing portion 2A of the housing 2 and selectively abuts against the lower end surface of the cylinder head 13. Since the lower end surface of this is connected to the push lever 11, the combustion chamber frame 12 also moves as the push lever 11 moves. A cylinder 21 that is slidably fitted to the inner peripheral surface of the combustion chamber frame 12 and guides the movement of the combustion chamber frame 12 is fixed to the main housing portion 2A of the housing 2. A compression coil spring (not shown) is mounted between the lower end surface and the combustion chamber frame 12, and the combustion chamber frame 12 is urged downward in FIG. 1 by this compression coil spring.

  In the vicinity of the lower portion of the cylinder 21, a plurality of exhaust holes 23 that can communicate with the exhaust ports 22 formed in the main housing portion 2A are formed. A bumper 24 is provided at the bottom of the cylinder 21.

  Further, a piston 25 is fitted into the cylinder 21 so as to be slidable in the vertical direction in FIG. 1, and when the upper end of the combustion chamber frame 12 comes into contact with the cylinder head 13, the cylinder head 13, the combustion chamber frame 12. A combustion chamber 26 is defined by the cylinder head side end of the cylinder 21 and the piston 25. A driver blade 27 extends from the piston 25 vertically downward.

  Thus, in the present embodiment, the oil permeation material 28 with high oil impregnation properties is opposed to the exhaust path of the combustion gas, specifically, the inner peripheral surface of the housing 2 and the outer peripheral surface of the cylinder 21. A gap δ is formed between the two oil permeating materials 28 so that the combustion gas can pass therethrough (see FIG. 3). For the oil permeable material 28, for example, felt (foam material such as sponge or cotton) is used. Further, both oil permeation materials 28 may be provided in contact with each other without providing the gap δ, and the outflow of the lubricating oil to the outside of the housing 2 may be prevented more effectively. However, since the air passage of the combustion gas by the fan 19 cannot be secured, the lubricating oil flows along the housing 2 and the cylinder 21, so there is no problem even if a slight gap δ is provided.

  Next, the operation of the combustion nailing machine 1 configured as described above will be described.

  In the state shown in FIG. 1, when the handle 5 is gripped and the tip of the push lever 11 is pressed against the not-shown material as shown in FIG. 2, the push lever 11 resists the urging force of the compression coil spring (not shown). Then, the combustion chamber frame 12 connected to the push lever 11 also rises and comes into close contact with the lower surface of the cylinder head 13, so that a combustion chamber 26 that is blocked from outside air is formed.

  When the gas cylinder 3 is pressed in conjunction with the operation of the push lever 11, the liquefied gas filled in the gas cylinder 3 and the lubricating oil contained therein are passed through the metering valve 4 and the fuel passage 20 from the injection port to the combustion chamber 26. When the combustion chamber frame 12 reaches top dead center, the motor 16 is started and the fan 19 rotates in the combustion chamber 26. As the fan 19 rotates in the combustion chamber 26 in this manner, the liquefied gas injected into the combustion chamber 26 is agitated and mixed with air to form an air-fuel mixture.

  When the trigger 6 is pulled and the trigger switch 7 is turned on following the pressing operation of the push lever 11 against the workpiece, a spark is generated in a spark plug (not shown) by an ignition circuit (not shown), and the combustion chamber 26 The air-fuel mixture is ignited and burned. The high-temperature and high-pressure combustion gas expanded by the combustion of the air-fuel mixture in the combustion chamber 26 pushes the piston 25 downward along the cylinder 21, and the nail is hit by the driver blade 27 that moves downward together with the piston 25. Drive into the insert.

  As described above, when the nail is driven into the driven material, the piston 25 collides with the bumper 24 to reduce the impact, and the combustion gas is discharged from the plurality of exhaust holes 23 to the outside of the cylinder 21. Here, a check valve (not shown) is provided in the exhaust hole 23 and provided in the exhaust hole 23 when the combustion gas is discharged out of the cylinder 21 and the inside of the cylinder 21 and the combustion chamber 26 becomes atmospheric pressure. A check valve (not shown) is closed.

  Then, when the high-temperature combustion gas remaining in the combustion chamber 26 is rapidly cooled, and the pressure in the combustion chamber 26 is reduced to below atmospheric pressure (thermal vacuum), the piston 25 and the driver blade 27 are in an initial state. It is pulled back to the top dead center position.

  Thereafter, the pulling operation of the trigger 6 is released, the trigger switch 7 is turned OFF, the combustion type nailing machine 1 is lifted and the push lever 11 is moved away from the driven material. It moves downward by the urging force of the illustrated compression coil spring and returns to the original initial position shown in FIG. At this time, the fan 19 continues to rotate for a predetermined time.

  Thus, when the combustion chamber frame 12 moves down and returns to the original initial position, the sealed state of the combustion chamber 26 is opened, and a flow is generated in the combustion chamber 26 as the fan 19 rotates in this state. . Then, through this flow, air in the atmosphere is sucked into the combustion chamber 26 through the intake port 15 formed in the head cover 14 and the intake port (not shown) formed in the cylinder head 13, and this air causes the inside of the combustion chamber 26 to be sucked into the combustion chamber 26. 1 flows downward through the exhaust path between the combustion chamber frame 12 and the cylinder 21 as indicated by an arrow in FIG. 1, and the exhaust hole 22 formed in the main housing portion 2 </ b> A of the housing 2. To the atmosphere. At this time, the motor 16, the motor mount 17, and the cylinder head 13 are cooled, and then the rotation of the fan 19 is stopped.

  By the way, the gas injected from the gas cylinder 3 into the combustion chamber 26 contains not only the combustible gas that generates combustion explosion energy but also lubricating oil so that the combustion chamber frame 12 can slide smoothly. Lubricating oil is not burned but is contained in the combustion gas. For this reason, conventionally, the lubricating oil contained in the combustion gas adheres to and accumulates in the exhaust path, and when the number of times of use of the gas cylinder 3, that is, the number of times of use of the combustion nail gun 1 increases, the lubrication accumulated in the exhaust path. There has been a problem that the oil moves along the outer peripheral surface of the cylinder 21 or the inner peripheral surface of the housing 2 and eventually flows out from the exhaust port 22 opened at the lower portion of the housing 2.

  However, in the present embodiment, the oil-permeable material 28 having high oil impregnation property is attached to a part of the exhaust path of the combustion gas, specifically, the inner peripheral surface of the housing 2 and the outer peripheral surface of the cylinder 21 so as to face each other. Therefore, since the lubricating oil accumulated in the exhaust path and moving along the outer peripheral surface of the cylinder 21 or the inner peripheral surface of the housing 2 penetrates and is absorbed by the oil permeation material 28, the exhaust port that opens at the lower portion of the housing 2 22 does not flow outside. For this reason, even when the combustion nailing machine 1 is used, for example, for finishing the interior of a house or assembling furniture, the lubricating oil scatters on the decorative plate where finishing is important and the finishing is impaired. There is no problem.

  In addition, since the oil permeation capacity of the oil permeation material 28 is limited, it is necessary to periodically remove and clean the oil permeation material 28 or replace it with a new one. When cleaning the oil penetrating material 28, there is a method of inserting a sponge or the like from the exhaust port 22 of the housing 2 and sucking the oil sucked by the oil penetrating material 28 with the sponge or the like. When replacing the oil permeable material 28 with a new one, the oil permeable material 28 is attached with an adhesive such as a double-sided tape. The type nailer 1 may be replaced at the maintenance time. Further, since the oil permeation material 28 is provided in the exhaust passage through which the high-temperature combustion gas passes, a material having high heat resistance should be used for this. In addition to the method of attaching the oil permeable material 28 with an adhesive, ribs are provided on the portion where the oil permeable material 28 can be attached, such as the inner surface of the housing 2 and the outer surface of the cylinder 21 to sandwich the oil permeable material 28. Also good.

  In the above embodiment, the oil-permeable material 28 is attached to the inner peripheral surface of the housing 2 and the outer peripheral surface of the cylinder. However, the oil-permeable material 28 is attached only to the inner peripheral surface of the housing 2 as shown in FIG. Alternatively, it is possible to obtain the same effect as described above by attaching only to the outer peripheral surface of the cylinder as shown in FIG. 5 and further attaching to the inner peripheral surface of the combustion chamber frame as shown in FIG. That is, any position may be used as long as the oil permeating material 28 is provided in the exhaust path of the combustion gas. The oil penetrating material 28 can be provided over the entire circumference or in the exhaust passage in a place (the housing 2, the cylinder 21, the combustion chamber frame 12) to which the oil penetrating material 28 can be attached. When the oil penetrating material 28 is provided in the exhaust passage, the lubricating oil may flow throughout the combustion nailing machine 1 such as the housing 2. Therefore, in order to guide the lubricating oil to the oil penetrating material 28, ribs or the like may be used. Lubricating oil can be reliably absorbed by providing a guide part. Further, by providing the oil permeation material 28 in the vicinity of the opening to the outside such as the exhaust port 22, the oil permeation material 28 can be easily replaced.

  Although the present invention has been described with respect to a form in which the present invention is applied particularly to a combustion type nailing machine, the present invention is not limited to any other combustion type driving apparatus for driving a stopper such as a hook or staple other than a nail. Of course, the present invention can be similarly applied to a machine.

It is a fracture side view of a combustion type nailing machine as one form of the combustion type driving machine according to the present invention. It is a fracture side view (at the time of driving) of a combustion type nailing machine as one form of a combustion type driving machine concerning the present invention. It is the A section enlarged detail drawing of FIG. It is a figure similar to FIG. 2 which shows the other form of this invention. It is a figure similar to FIG. 2 which shows the other form of this invention. It is a figure similar to FIG. 2 which shows the other form of this invention.

Explanation of symbols

1 Combustion type nailing machine (combustion type driving machine)
DESCRIPTION OF SYMBOLS 2 Housing 2A Main housing part 2B Cylinder chamber part 3 Gas cylinder 4 Metering valve 5 Handle 6 Trigger 7 Trigger switch 8 Battery 9 Magazine 10 Nose 11 Push lever 12 Combustion chamber frame 13 Cylinder head 14 Head cover 15 Inlet 16 Motor 16a Motor output shaft 17 Motor mount 18 Spring 19 Fan 20 Fuel passage 21 Cylinder 22 Exhaust port 23 Exhaust port 24 Bumper 25 Piston 26 Combustion chamber 27 Driver blade 28 Oil penetrant

Claims (5)

A housing, a gas cylinder accommodated in the housing, a cylinder head fixed to one end of the housing, a combustion chamber frame that forms a combustion chamber together with the cylinder head, and a slidable guide for the combustion chamber frame A piston that is slidably fitted in the cylinder, and a driver blade that moves together with the piston, and the piston and the driver blade by combustion of fuel gas injected from the gas cylinder into the combustion chamber In the combustion type driving machine that drives the stopper into the driven material and discharges the combustion gas remaining in the combustion chamber to the atmosphere through the exhaust path,
A combustion type driving machine characterized in that an oil permeation material is provided in a part of the exhaust path.   2. The combustion type driving machine according to claim 1, wherein the oil penetrating material is attached to an inner peripheral surface of the housing.   The combustion type driving machine according to claim 1 or 2, wherein the oil penetrating material is attached to an outer peripheral surface of the cylinder.   2. The oil penetrating material is attached to an inner peripheral surface of the housing and an outer peripheral surface of the cylinder so as to face each other, and a gap is formed between the two oil penetrating materials for passage of combustion gas. The combustion type driving machine described.   The combustion type driving machine according to any one of claims 1 to 4, wherein the oil penetrating material is attached to an inner peripheral surface of the combustion chamber frame.

Images