WO2017056810A1

WO2017056810A1 - Driver

Info

Publication number: WO2017056810A1
Application number: PCT/JP2016/075006
Authority: WO
Inventors: 俊徳安富; 宗太郎相澤; 佐藤　慎一郎; 貴士上田
Original assignee: 日立工機株式会社
Priority date: 2015-09-30
Filing date: 2016-08-26
Publication date: 2017-04-06

Abstract

Provided is a driver configured so that the size of a piston will not increase in a center axis direction. A driver (10) has: a driver blade (23) for impacting a fastener (48); a piston (18) to which the driver blade (23) is mounted; a cylinder (16) in which the piston (18) is accommodated so that the piston (18) can reciprocate; and an air pressure chamber (21) for impacting the piston (18). The driver (10) further has: a seal member (55) provided on the outer peripheral surface of the piston (18) and in contact with the cylinder (16); and a slide ring (56) provided on the outer peripheral surface of the piston (18) and guiding the reciprocal movement of the piston (18) within the cylinder (16).

Description

Driving machine

The present invention relates to a driving machine that operates a piston with the pressure of a pressure chamber to hit a stopper.

A driving machine for driving a stopper into a driven member is described in Patent Document 1. The driving machine described in Patent Document 1 is attached to a hollow housing, a cylinder provided in the housing, a piston movably accommodated in the cylinder, a groove provided on the outer peripheral surface of the piston, and the groove. An O-ring. The driving machine includes a driver fixed to the piston, a piston stop provided in the housing, an annular seal surface provided in the piston stop, a flow path formed in the housing, and an air passage connected to the flow path. And a valve mechanism provided in the housing, and a valve stem for operating the valve mechanism. The driving machine has a trigger lever and a contact arm for operating the valve stem.

In the driving machine described in Patent Document 1, when the valve mechanism is not operating, the piston is disposed in the cylinder at a position close to top dead center. When the piston stops at a position close to top dead center, the piston is in close contact with the annular seal surface. When the valve mechanism operates, the compressed air enters the piston groove through the air passage and the flow path. The pressure in the groove is applied to the O-ring, and a force acts to move the piston toward the bottom dead center. The piston is stopped by the frictional force between the O-ring and the inner surface of the cylinder.

After that, when the force to move the piston toward the bottom dead center exceeds the frictional force generated at the contact point between the O-ring and the cylinder, the piston moves and leaves the annular seal surface. Then, the compressed air enters between the upper surface of the piston and the piston stop. As a result, the pressure of the compressed air acts on the entire upper surface of the piston, the piston moves toward the bottom dead center, and the driver drives the nail.

JP 2006-272464 A

However, in the driving machine described in Patent Document 1, if a ring member is attached to the outer peripheral surface of the piston in order to prevent the piston from being inclined with respect to the cylinder, the piston can be enlarged in the center line direction. There was sex.

The objective of this invention is providing the driving device which can suppress that a piston enlarges in a center line direction.

An embodiment of the invention includes a piston having a striking element attached thereto, a cylinder in which the piston is accommodated so as to be able to reciprocate, and a pressure chamber connected to the inside of the cylinder and striking the piston. A first seal member provided on the outer peripheral surface of the piston and contacting the cylinder; and provided on the outer peripheral surface of the piston and guiding reciprocation of the piston inside the cylinder. And a slide ring.

In the driving machine according to the present invention, since the piston is provided with the slide ring, the piston can be prevented from being enlarged in the center line direction.

It is a longitudinal cross-sectional view which shows the driving machine of this invention. It is a partial longitudinal cross-sectional view of the driving machine shown in FIG. (A), (B) is sectional drawing which shows the structure of the piston shown in FIG. 2, (C) is a top view which shows the structure of the piston shown in FIG. It is a longitudinal cross-sectional view which shows the example which provided the auxiliary piston in the cylinder. (A) is sectional drawing which shows the piston and auxiliary piston of FIG. 4, (B) is sectional drawing which shows the other example of an auxiliary piston. (A), (B) is sectional drawing which shows the structural example of a piston and an auxiliary piston. (A), (B) is sectional drawing which shows the structural example of a piston and an auxiliary piston.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same code | symbol is attached | subjected to the common member.

1 and 2 includes a housing 11, which includes a cylinder case 12, a motor case 13 continuing to the cylinder case 12, a handle 14 continuing to the cylinder case 12, and a handle. 14 and a mounting portion 15 that continues to the motor case 13. A cylindrical cylinder 16 is provided in the cylinder case 12. The cylinder 16 is made of metal, and a piston 18 is disposed in the cylinder 16 so as to be able to reciprocate. The operating direction of the piston 18 is the direction of the center line B1 of the cylinder 16. A driver blade 23 is attached to the piston 18.

A pressure accumulating container 19 is provided in the cylinder case 12, and the pressure accumulating container 19 and the cylinder 16 are connected by a connecting member 20. The connecting member 20 is annular, and a pneumatic chamber 21 is formed from the pressure accumulating container 19 to the cylinder 16. The pneumatic chamber 21 is connected to the inside of the cylinder 16 and contains air that is a compressible fluid. A holder 24 is provided in the housing 11. The cylinder 16 is positioned by the connecting member 20 and the holder 24 in the center line B1 direction and the radial direction. The holder 24 is disposed at a position opposite to the position where the pressure accumulating container 19 is disposed in the direction of the center line B1 of the cylinder 16.

The holder 24 supports the bumper 25, and the bumper 25 is integrally formed of a rubber-like elastic body. A shaft hole 24 a is provided in the holder 24, and a guide hole 26 is provided in the bumper 25. The driver blade 23 is made of metal, and the driver blade 23 is movable in the direction of the center line B1 within the shaft hole 24a and the guide hole 26. When the piston 18 and the driver blade 23 operate and the piston 18 collides with the bumper 25, the bumper 25 attenuates and reduces the impact load.

An accommodating portion 37 is provided at the end of the cylinder case 12, and the accommodating portion 37 is continuous with the motor case 13. An injection unit 27 is attached to the storage unit 37. An injection path 31 is provided in the injection unit 27. The injection path 31 is a guide hole arranged along the direction of the center line B1. The driver blade 23 can reciprocate in the direction of the center line B1 in the injection path 31. The driver blade 23 has a rectangular outer shape in plan view perpendicular to the center line B1. The driver blade 23 is disposed across the cylinder 16, the guide hole 26, the shaft hole 24 a, and the injection path 31.

A push rod 32 is attached to the injection unit 27. The push rod 32 is disposed outside the injection unit 27, and the push rod 32 is movable in the direction of the center line B1 with respect to the injection unit 27. The tip of the push rod 32 is pressed against the driven member. In the injection path 31, an injection port 31 a is provided at a location closest to the tip of the push rod 32. The push rod 32 is pushed away from the bumper 25 by the force of a compression coil spring (not shown), that is, pressed downward in FIG.

A power mechanism 76 is provided in the accommodating portion 37. The power mechanism 76 operates the driver blade 23 in a direction approaching the pneumatic chamber 21 against the force of the pneumatic chamber 21. The configuration of the power mechanism 76 will be described. A rotation element 38 is provided in the accommodating portion 37. The rotation element 38 is fixed to a drive shaft 39, and the drive shaft 39 is supported by two bearings 40 so as to be rotatable about the center line B2.

The center line B2 is arranged so as to intersect with the center line B1 in a side view of the driving machine 10 shown in FIG. Although FIG. 1 shows an example in which the center line B1 and the center line B2 are at right angles, the center line B1 and the center line B2 need not be at right angles. When the driving machine 10 is viewed from the front as shown in FIG. 2, the center line B1 and the center line B2 do not intersect. A pinion pin 41 is provided on the rotating element 38. A plurality of pinion pins 41 are arranged at intervals in the rotation direction of the rotating element 38. *

On the other hand, a rack 42 is provided on the side edge of the driver blade 23 along the direction of the center line B1. The rack 42 is configured such that convex portions and concave portions are alternately arranged at a constant interval in the direction of the center line B1, and the pinion pins 41 can be engaged with and detached from the rack 42. The rotating element 38, the pinion pins 41, and the rack 42 constitute a power mechanism 76.

An electric motor 43 that rotates the rotating element 38 is provided. The electric motor 43 is provided in the motor case 13. The electric motor 43 includes a stator that is fixed to the motor case 13 and a rotor that is rotatably provided in the motor case 13. A planetary gear type speed reducer 46 is provided in the accommodating portion 37, and an input shaft of the speed reducer 46 is connected to the rotor. The output shaft of the speed reducer 46 is connected to the drive shaft 39.

A battery 47 is attached to the mounting portion 15. The battery 47 can be attached to and detached from the mounting portion 15, and the battery 47 supplies power to the electric motor 43. The battery 47 includes a storage case and a plurality of battery cells stored in the storage case. The battery cell is a secondary battery composed of a lithium ion battery, a nickel hydrogen battery, a lithium ion polymer battery, a nickel cadmium battery, or the like.

A magazine 49 that houses a plurality of stoppers 48 is provided, and the magazine 49 is fixed to the housing 11 and the injection unit 27. The magazine 49 is provided with a feeding mechanism, and the feeding mechanism supplies the stopper 48 accommodated in the magazine 49 to the injection path 31. The stopper 48 is an axial nail.

A trigger 83 is provided on the handle 14, and a trigger switch for detecting whether or not an operating force is applied to the trigger 83 is provided. The injection unit 27 is provided with a pressing sensor and a rotation angle sensor. The pressing sensor detects whether or not the tip of the push rod 32 has been pressed against the driven member and outputs a signal. The rotation angle sensor detects a rotation angle of the rotation element and outputs a signal.

A control board 84 is provided in the mounting portion 15, and a controller and an inverter circuit are provided on the control board 84. The inverter circuit is connected to the stator of the electric motor 43 and has a switching element. The controller processes signals output from the pressing sensor, the rotation angle sensor, and the trigger switch to control the inverter circuit. That is, the controller controls the rotation, stop, and rotation speed of the electric motor 43.

Next, a control example of the driving machine 10 will be described. After the stopper 48 is driven, the controller drives the electric motor 43 to move the piston 18 to a predetermined position, and then stops the electric motor 43. This control is performed regardless of whether the trigger switch is on or off. That is, the piston 18 is pushed toward the bumper 25 by the air pressure of the pneumatic chamber 21, and the piston 18 stops at the bottom dead center or stops at a predetermined position above the bottom dead center. The bottom dead center is a position where the piston 18 is pressed against the bumper 25. The predetermined position of the piston 18 is a position where the piston 18 is separated from the bumper 25. When the piston 18 stops at a predetermined position, the piston 18 stops at the predetermined position against the pressure of the pneumatic chamber 21 by the force applied from the rotating element 38 to the driver blade 23.

When the controller detects that the push rod 32 is pressed against the driven member and an operation force is applied to the trigger 83, the controller rotates the electric motor 43. The rotational force of the electric motor 43 is transmitted to the rotary element 38 via the speed reducer 46. When the rotation element 38 rotates counterclockwise in FIG. 2 and the pinion pin 41 engages with the rack 42, the piston 18 rises toward the top dead center, and the pressure in the pneumatic chamber 21 rises.

After the piston 18 is raised by the rotational force of the electric motor 43 and reaches the top dead center, the pinion pin 41 is separated from the rack 42. Then, the piston 18 moves in the direction of the center line B 1 from the top dead center to the bottom dead center due to the pressure of the pneumatic chamber 21. Then, the driver blade 23 strikes the stopper 48 in the injection path 31, and the stopper 48 is driven into the driven member from the injection port 31 a of the injection path 31.

Further, when the driver blade 23 drives the stopper 48 into the driven member, the piston 18 descends with a surplus kinetic energy, the piston 18 collides with the bumper 25, and the driver blade 23 and the piston 18. A part of the kinetic energy is absorbed by the bumper 25. The controller stops the electric motor 43 after the driver blade 23 hits the stopper 48 and before or after the pinion pin 41 is engaged with the rack 42 again. The controller determines the timing for stopping the electric motor 43 from the rotation angle of the rotation element 38.

Next, a structural example of the piston 18 will be described with reference to FIG. The piston 18 is made of metal, and

annular ribs

50, 51, 52 are provided on the outer periphery of the piston 18. The

ribs

50, 51, 52 are arranged at intervals in the direction of the center line B1. The rib 51 is disposed between the rib 50 and the rib 52 in the direction of the center line B1. The rib 50 is disposed between the pneumatic chamber 21 and the rib 51 in the direction of the center line B1, and the rib 52 is disposed between the rib 51 and the bumper 25 in the direction of the center line B1.

The piston 18 has an attachment groove 53 formed between the rib 50 and the rib 51 and an attachment groove 54 formed between the rib 51 and the rib 52. The

attachment grooves

53 and 54 are formed in an annular shape around the center line B1. An annular seal member 55 is attached to the attachment groove 53. The seal member 55 is integrally formed of a rubber-like elastic body, and the cross-sectional shape of the seal member 55 in the direction along the center line B1 is an X shape.

A slide ring 56 is attached to the attachment groove 54. The slide ring 56 is integrally formed of synthetic resin. The slide ring 56 has lower rigidity than the piston 18 and higher rigidity than the seal member 55. The outer diameter of the slide ring 56 is larger than the outer diameter of each of the

ribs

50, 51 and 52. The outer peripheral surface of the slide ring 56 is flat. The slide ring 56 guides the reciprocating motion of the piston 18 inside the cylinder 16.

A lubricating groove 57 is provided in the mounting groove 54. Lubricating grooves 57 are arranged at two locations at intervals in the circumferential direction around the center line B1. The lubrication groove 57 has an arc shape in a plan view perpendicular to the center line B1. A lubricant such as liquid lubricant, semi-solid grease, or solid lubricant is accommodated in the lubrication groove 57, and a slide ring 56 is attached to the attachment groove 54. That is, the lubricating groove 57 is disposed inside the slide ring 56 in the radial direction of the slide ring 56.

Furthermore, the straight line C1 passing through the center of the lubricating groove 57 in the width direction and the center of the mounting groove 54 in the width direction is common. The width direction of the lubrication groove 57 and the width direction of the attachment groove 54 are the direction of the center line B1. The straight line C1 is perpendicular to the center line B1.

Further, a boss portion 58 is provided at an end portion of the driver blade 23, and a connection hole 59 penetrating the boss portion 58 is provided. The boss portion 58 can also be grasped as a coupling portion. In the plan view of the piston 18, the center line B 1 is at the center of the connecting hole 59. Further, a connecting hole 60 that penetrates the piston 18 in the radial direction is provided. The connection hole 60 is provided in the arrangement region of the attachment groove 54 in the direction of the center line B1. The two openings 60 A of the connection hole 60 are disposed on the outer peripheral surface of the piston 18, specifically, the bottom surface of the attachment groove 54. The lubrication groove 57 is disposed between the two openings 60 A in the circumferential direction of the piston 18. Further, an insertion hole 85 is provided in the piston 18. The insertion hole 85 reaches from the end surface 52A of the rib 52 to a location corresponding to the rib 51 in the direction of the center line B1. The insertion hole 85 has a depth in the direction of the center line B 1, and the boss portion 58 is disposed in the insertion hole 85.

The connection holes 59 and 60 are in the same position in the direction of the center line B1, and the connection holes 59 and 60 are circular in a side view in the direction of the center line B1. Furthermore, the inner diameter of the connection hole 59 and the inner diameter of the connection hole 60 are the same. Cylindrical pins 61 are arranged in the connecting

holes

59 and 60. The pin 61 is made of metal. The length of the pin 61 is equal to or less than the diameter of the bottom surface of the mounting groove 54, and the slide ring 56 prevents the pin 61 from coming out of the connection holes 59 and 60. The pin 61 positions and fixes the piston 18 and the driver blade 23 in the direction of the center line B1. In the direction of the center line B1, the center line C2 and the straight line C1 of the pin 61 are arranged at different positions. The pin 61 and the boss portion 58 are disposed inside the attachment groove 54 in the radial direction of the piston 18.

In a state where the piston 18 is disposed in the cylinder 16, the seal member 55 contacts the inner peripheral surface of the cylinder 16 to form a seal surface. That is, the seal member 55 maintains the airtightness of the pneumatic chamber 21. The piston 18 reciprocates in the direction of the center line B 1 in a state where the outer peripheral surface of the slide ring 56 is in contact with the inner peripheral surface of the cylinder 16. Therefore, in either case where the piston 18 moves from the top dead center toward the bottom dead center, or in the case where the piston 18 moves from the bottom dead center toward the top dead center, the piston 18, specifically, The

ribs

50, 51, 52 can be prevented from contacting the inner peripheral surface of the cylinder 16.

Further, the connecting mechanism for connecting the piston 18 and the driver blade 23, that is, the boss portion 58 and the pin 61 are arranged in the arrangement region of the piston 18 in a side view of the piston 18 including the center line B1. More specifically, a part of the coupling mechanism does not have to protrude from the end face 52A in the direction of the center line B1. For this reason, it can suppress that piston 18 enlarges in the direction of centerline B1. Further, the end surface 52A can be made flat, and the contact area between the piston 18 and the bumper 25 can be made relatively wide. Furthermore, it can suppress that the rigidity of the connection mechanism of the piston 18 and the driver blade 23 falls.

Further, in the direction of the center line B1, the distance between the center of the piston 18 in the direction of the center line B1 and the center line C2 of the pin 61 is relatively short. This is because the pin 61 is arranged in the arrangement area of the piston 18. For this reason, when the reaction force when hitting the stopper 48 with the driver blade 23 or the pushing force applied to the driver blade 23 from the rotating element 38 is transmitted to the piston 18 via the pin 61, the pin 61 As a result, an increase in rotational moment generated by the piston 18 can be suppressed. Therefore, the piston 18 can be prevented from tilting with respect to the center line B1 of the cylinder 16.

Furthermore, since the lubricant is accommodated in the lubrication groove 57, the lubricant is supplied to the contact surface between the slide ring 56 and the cylinder 16 and the contact surface between the seal member 55 and the cylinder 16. Therefore, wear and seizure of the cylinder 16, the slide ring 56, and the seal member 55 can be suppressed, and durability of the cylinder 16, the slide ring 56, and the seal member 55 is improved.

Furthermore, since the enlargement of the piston 18 can be suppressed in the direction of the center line B1, the width of the slide ring 56 can be made relatively wide and the width of the lubricating groove 57 can be secured. Accordingly, it is possible to suppress a decrease in performance in which the lubricant lubricates the seal member 55, the slide ring 56, and the cylinder 16. Moreover, since the inclination of the piston 18 is suppressed by the single slide ring 56, the piston 18 can be prevented from being enlarged in the direction of the center line B1.

FIG. 4 shows another example of the driving machine 10. 4, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals. The piston 18 and the driver blade 23 shown in FIG. 4 are connected by a pin 61 as shown in FIG. That is, the coupling mechanism between the piston 18 and the driver blade 23 is the same as the coupling mechanism shown in FIG.

The driving machine 10 shown in FIG. 4 has an auxiliary piston 70 provided in the cylinder 16, and the auxiliary piston 70 is made of metal. The auxiliary piston 70 is disposed between the piston 18 and the air pressure chamber 21 in the direction of the center line B1, and is movable in the direction of the center line B1. The auxiliary piston 70 includes

annular ribs

71 and 72 and an attachment groove 73 provided between the rib 71 and the rib 72. The

ribs

71 and 72 are arranged at different positions in the direction of the center line B1. The rib 72 is disposed between the rib 71 and the piston 18 in the center line direction.

A seal member 74 is attached to the attachment groove 73. The material and shape of the seal member 74 are the same as those of the seal member 55. The seal member 74 is in contact with the inner peripheral surface of the cylinder 16 to form a seal surface, and ensures the airtightness of the pneumatic chamber 21. In the cylinder 16, a lubrication chamber 75 is provided between the piston 18 and the auxiliary piston 70. A lubricant is contained in the lubrication chamber 75. The lubricant stored in the lubrication chamber 75 may be the same as or different from the lubricant stored in the lubrication groove 57.

When the driving machine 10 of FIGS. 1 and 2 includes the piston 18 and the auxiliary piston 70 shown in FIGS. 4 and 5A, the auxiliary piston 70 is always at the piston 18 by the pressure of the pneumatic chamber 21. It is energized towards. Further, the moving force of the piston 18 is transmitted to the auxiliary piston 70 via the lubrication chamber 75 in the stroke in which the driver blade 23 and the piston 18 are lifted by the rotational force of the rotating element 38. For this reason, the auxiliary piston 70 rises together with the piston 18 and the pressure in the pneumatic chamber 21 rises. *

When the pinion pin 41 is released from the rack 42 after the piston 18 reaches the top dead center, the rotational force of the rotating element 38 is not transmitted to the driver blade 23. Since the pressure in the pneumatic chamber 21 is transmitted to the piston 18 via the auxiliary piston 70 and the lubrication chamber 75, when the pinion pin 41 is released from the rack 42, the auxiliary piston 70 and the piston 18 descend, and the driver blade 23 hits the stop 48.

In the driving machine 10 of FIG. 4, the lubricant in the lubrication chamber 75 is supplied to the contact portion between the

seal members

55 and 74 and the cylinder 16 to lubricate the contact portion. Therefore, the durability of the

seal members

55 and 74 and the cylinder 16 is improved.

FIG. 5B shows another structural example of the auxiliary piston 70. The auxiliary piston 70 has an oil supply hole 77. The oil supply hole 77 passes through the auxiliary piston 70 in the direction of the center line B 1, and a female screw is provided on the inner peripheral surface of the oil supply hole 77. The oil supply hole 77 is connected to the lubrication chamber 75, and a plug 78 that closes the oil supply hole 77 is provided. A male screw is provided on the outer peripheral surface of the plug 78, and when the plug 78 is tightened and fixed to the auxiliary piston 70, the plug 78 closes the oil supply hole 77. In the assembly process of the driving machine 10 or in a state where the driving machine 10 is disassembled, the lubricant can be supplied from the oil supply hole 77 to the lubrication chamber 75 and the oil supply hole 77 can be closed by the plug 78.

The structures of the auxiliary piston 70 and the piston 18 shown in FIG. 5B are the same as the structures of the auxiliary piston 70 and the piston 18 shown in FIGS. 3, 4, and 5A. The connection mechanism between the piston 18 and the driver blade 23 shown in FIG. 5B is the same as the connection mechanism between the piston 18 and the driver blade 23 shown in FIG.

The action and effect of the piston 18 shown in FIG. 5B are the same as the action and effect of the piston 18 shown in FIG. Further, the operation and effect of the auxiliary piston 70 shown in FIG. 5B are the same as the operation and effect of the auxiliary piston 70 shown in FIGS. 4 and 5A. Further, in the auxiliary piston 70 shown in FIG. 5B, the lubricant can be supplied from the oil supply hole 77 to the lubrication chamber 75 in a state where the plug 78 is not attached to the auxiliary piston 70.

FIG. 6A shows another example of the piston 18 and the auxiliary piston 70. The piston 18 shown in FIG. 6A and the auxiliary piston 70 are connected by a connecting portion 80. The piston 18, the connection portion 80, and the auxiliary piston 70 are integrally formed of a metal material. The connection part 80 is provided centering on the center line B1, and the outer diameter of the connection part 80 is smaller than the outer diameter of the piston 18 and the outer diameter of the auxiliary piston 70.

A lubrication chamber 75 is provided between the piston 18 and the auxiliary piston 70, that is, around the connection portion 80. The lubrication chamber 75 is annular, and the lubricant is accommodated in the lubrication chamber 75. An oil supply hole 77 is provided in the auxiliary piston 70, and the arrangement region of the oil supply hole 77 is different from the arrangement region of the connecting portion 80 in a plan view of the auxiliary piston 70. FIG. 6 is an example in which a plurality of oil supply holes 77 are provided, and the plurality of oil supply holes 77 are respectively closed by plugs 78.

The piston 18 shown in FIG. 6A can obtain the same effect as the piston 18 shown in FIG. Further, the auxiliary piston 70 shown in FIG. 6 (A) can obtain the same effect as the auxiliary piston 70 shown in FIG. 5 (B). Furthermore, the piston 18 and the auxiliary piston 70 shown in FIG. Therefore, the coaxiality between the piston 18 and the auxiliary piston 70 can be ensured, and the piston 18 and the auxiliary piston 70 can be prevented from being inclined with respect to the center line B1. Further, the piston 18 and the auxiliary piston 70 move and stop simultaneously in the direction of the center line B1.

FIG. 6B shows another structural example of the auxiliary piston 70. The piston 18 and the auxiliary piston 70 are not connected. Further, the auxiliary piston 70 shown in FIG. 6B has a convex portion 81 that protrudes from a location closest to the piston 18. The convex portion 81 is provided around the center line B1 and protrudes in the direction of the center line B1. A lubrication chamber 75 is provided between the piston 18 and the auxiliary piston 70. For this reason, when the convex part 81 contacts the piston 18, the minimum value of the interval between the piston 18 and the auxiliary piston 70 in the direction of the center line B1 is determined.

The piston 18 shown in FIG. 6B can obtain the same effect as the piston 18 shown in FIG. Moreover, the auxiliary piston 70 shown in FIG. 6 (B) can obtain the same effect as the auxiliary piston 70 shown in FIG. 5 (B).

Further, the auxiliary piston 70 shown in FIG. For this reason, the moving force of the piston 18 is transmitted to the auxiliary piston 70 through the convex portion 81 in the stroke in which the piston 18 moves up. Further, the moving force of the auxiliary piston 70 is transmitted to the piston 18 via the convex portion 81 in the stroke in which the auxiliary piston 70 is lowered by the pressure of the pneumatic chamber 21.

FIG. 7A shows another example of the piston 18. The piston 18 and the auxiliary piston 70 are not connected. The piston 18 shown in FIG. 7A has a protrusion 82 that protrudes from a location closest to the auxiliary piston 70. The convex part 82 is provided centering on the center line B1, and protrudes in the center line B1 direction. Note that the auxiliary piston 70 does not include the convex portion 81. A lubrication chamber 75 is provided between the piston 18 and the auxiliary piston 70. For this reason, when the convex part 82 contacts the auxiliary piston 70, the minimum value of the interval between the piston 18 and the auxiliary piston 70 in the direction of the center line B1 is determined.

The piston 18 shown in FIG. 7A can obtain the same effect as the piston 18 shown in FIG. Further, the auxiliary piston 70 shown in FIG. 7A can obtain the same effects as the auxiliary piston 70 shown in FIG.

Furthermore, the piston 18 shown in FIG. For this reason, the moving force of the piston 18 is transmitted to the auxiliary piston 70 through the convex portion 82 in the stroke in which the piston 18 moves up. Further, the moving force of the auxiliary piston 70 is transmitted to the piston 18 through the convex portion 82 in the stroke in which the auxiliary piston 70 is lowered by the pressure of the pneumatic chamber 21.

FIG. 7B shows a combination example of the piston 18 and the auxiliary piston 70. The piston 18 has the convex part 82 similarly to the piston 18 of FIG. The auxiliary piston 70 has the convex part 81 similarly to the auxiliary piston 70 of FIG. A lubrication chamber 75 is provided between the piston 18 and the auxiliary piston 70.

In the piston 18 and the auxiliary piston 70 shown in FIG. 7B, the convex portion 81 and the convex portion 82 come into contact with each other, and the minimum value of the distance between the piston 18 and the auxiliary piston 70 in the center line B1 direction is determined. The effect of the piston 18 in FIG. 7B is the same as the effect of the piston 18 in FIGS. 3 and 7. The effect of the auxiliary piston 70 in FIG. 7B is the same as the effect of the piston 18 in FIGS. 5 and 6B.

Here, the correspondence between the configuration described in the present embodiment and the configuration of the present invention will be described. The driver blade 23 is the striker of the present invention, the piston 18 is the piston of the present invention, and the cylinder 16. Corresponds to the cylinder of the present invention, the pneumatic chamber 21 corresponds to the pressure chamber of the present invention, the seal member 55 corresponds to the first seal member of the present invention, and the slide ring 56 corresponds to the ring member of the present invention. The lubricating groove 57 corresponds to the first holding portion of the present invention, the boss portion 58 and the pin 61 correspond to the connecting mechanism of the present invention, and the connecting hole 60 corresponds to the connecting hole of the present invention. The opening 60A corresponds to the opening of the present invention, the auxiliary piston 70 corresponds to the auxiliary piston of the present invention, the lubrication chamber 75 corresponds to the second holding portion of the present invention, and the seal member 74, It corresponds to the second seal member of the present invention and the oil supply hole 77. The plug 78 corresponds to the plug of the present invention, the connecting portion 80 corresponds to the connecting portion of the present invention, and the convex portion 81 corresponds to the first convex portion of the present invention. And the convex part 82 is equivalent to the 2nd convex part of this invention, and the boss | hub part 58 is equivalent to the coupling | bond part of this invention.

The driving machine of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, it includes a driving machine that supplies compressed air generated by a compressor to an air pressure chamber via an air hose. Furthermore, the electric motor described in the embodiment includes a DC motor using a battery as a DC power source as a power source and an AC motor using an AC power source. Further, the motor may be any one of a hydraulic motor, a pneumatic motor, and an internal combustion engine instead of the electric motor.

The connection hole provided in the piston includes a structure that penetrates the piston in the radial direction and a structure that does not penetrate the piston in the radial direction. In the structure in which the connecting hole does not penetrate the piston in the radial direction, the opening of the connecting hole is arranged at one place on the outer peripheral surface of the piston. And a 1st holding groove is arrange | positioned in the circumferential direction of a piston in the location different from the arrangement location of an opening part. The coupling portion provided on the driver blade is a portion that connects the piston and the driver blade.

DESCRIPTION OF SYMBOLS 10 ... Driving machine, 16 ... Cylinder, 18 ... Piston, 21 ... Pneumatic chamber, 23 ... Driver blade, 55, 74 ... Seal member, 56 ... Slide ring, 57 ... Lubrication groove, 58 ... Boss part, 60 ... Connection hole , 60A ... opening, 61 ... pin, 70 ... auxiliary piston, 75 ... lubrication chamber, 77 ... oil supply hole, 78 ... plug, 80 ... connection part, 81, 82 ... convex part.

Claims

A driving machine comprising: a piston to which a striker is attached; a cylinder in which the piston is accommodated so as to be reciprocally movable; and a pressure chamber connected to the inside of the cylinder and hitting the piston. A first seal member that contacts the cylinder, and a slide ring that is provided on the outer peripheral surface of the piston and guides the reciprocating motion of the piston inside the cylinder. , Driving machine.
The driving device according to claim 1, wherein the first seal member is disposed between the slide ring and the pressure chamber in a direction of a center line of the cylinder.
3. The driving machine according to claim 2, wherein the piston is provided inside the slide ring in a plan view that intersects the center line, and has a first holding portion that contains a lubricant. 4.
The driving machine according to claim 3, wherein a connecting mechanism that connects the piston and the striker is provided, and the connecting mechanism is disposed in an arrangement region of the piston in a side view including the center line.
5. The driving machine according to claim 4, wherein the coupling mechanism includes a coupling portion provided on the striker, and a pin coupling the coupling portion and the piston.
6. The driving machine according to claim 4, wherein the coupling mechanism is disposed inside the first holding part in a plan view intersecting with the center line.
A connecting hole is provided along the radial direction of the piston, and the pin is arranged, and the connecting hole has an opening arranged in at least one place on the outer peripheral surface of the piston, The driving device according to claim 5, wherein the first holding portion is arranged at a location different from a location where the opening is arranged in a circumferential direction of the piston.
An auxiliary piston that is disposed between the piston and the pressure chamber in the direction of the center line in the cylinder and that transmits power of the center line to and from the piston; The driving machine according to any one of claims 2 to 7, further comprising a second holding portion that is provided between the auxiliary piston and that contains a lubricant.
The driving machine according to claim 8, further comprising a second seal member provided on an outer peripheral surface of the auxiliary piston and in contact with the cylinder.
10. The driving machine according to claim 8, further comprising a supply hole that penetrates the auxiliary piston in the center line direction and is connected to the second holding portion, and a plug that closes the supply hole.
The driving machine according to any one of claims 8 to 10, wherein a connecting portion for connecting the piston and the auxiliary piston is provided.
The driving machine according to any one of claims 8 to 11, wherein the auxiliary piston has a first convex portion that contacts the piston.
The driving machine according to any one of claims 8 to 12, wherein the piston has a second convex portion that contacts the auxiliary piston.