JP6423224B2 - VALVE DEVICE AND AIR TOOL WITH VALVE DEVICE - Google Patents

Description

  The present invention relates to a valve device for opening and closing a fluid passage through which a working fluid such as compressed air passes in a fluid working tool such as an air grinder, and more particularly to a fluid working tool including the valve device, in particular, an air tool.

  For example, Japanese Unexamined Patent Application Publication No. 2004-209596 (Patent Document 1) discloses a grinder that receives compressed air from a compressed air source (air pump), supplies the compressed air to an air motor, and rotates a polishing member to perform a polishing operation. . This grinder includes a valve body that is biased by a spring and closes a fluid passage for compressed air. When performing a polishing operation, an operator turns the valve operating element from an OFF (non-operation) position to ON (operation). The valve operating pin connected to the valve body is displaced from the closed position to the open position by setting the position, and the valve body is displaced from the fluid passage closed position to the fluid passage open position against the spring biasing force. Is supplied to an air motor to rotate the polishing member. When the polishing operation is interrupted or terminated, the operator returns the valve operating element from the ON position to the OFF position, whereby the valve body is returned to the fluid passage closed position by the spring biasing force, and the valve operating pin is also opened accordingly. The position is returned to the closed position.

JP 2004-209596 A

  In a fluid operation tool such as the grinder described above, foreign matter such as dust enters the valve device, the movement of the valve operation pin becomes worse, and even when the valve operating element is returned to the OFF position, It may occur that the fluid passage cannot be returned to the closed position.

  In view of such a point, the present invention includes a cam mechanism for forcibly returning the valve element in the fluid passage opening position to the fluid passage closing position as the valve operating element is returned from the ON position to the OFF position. An object of the present invention is to provide a valve device and a fluid working tool including the valve device, particularly an air tool.

That is, the present invention provides a fluid passage element having a fluid passage,
Attached to the fluid passage element and displaceable between a closed position for closing the fluid passage and an open position for pushing the fluid passage transversely from the closed position to open the fluid passage. Open / close actuated element,
The opening / closing operation element that is displaceable between the OFF position and the ON position on the outer peripheral surface of the fluid passage element, and projects outward from the fluid passage element when the fluid passage element is displaced from the ON position to the OFF position. And a valve operating element having a return cam contour curve portion configured to slidably engage with an end of the valve and return the opening / closing operation element from the open position to the closed position.

  In this valve device, a cam mechanism is used to reliably return the opening / closing operation element from the open position to the closed position, thereby solving the above-described problems.

In particular,
The opening / closing actuating element extending through the fluid passage element in the transverse direction and slidingly engaged with the return cam profile curve, and the other end opposite to the end And
When the valve operating element is displaced from the OFF position toward the ON position, the valve operating element is slidably engaged with the other end of the opening / closing operation element to move the opening / closing operation element from the closed position to the open position. And a pushing cam contour curve portion configured to be displaced to a predetermined distance.

  By sliding and engaging the cam contour curve portion at one end of the opening / closing operation element and the pushing cam contour curve portion at the other end, the displacement between the open position and the closing position of the opening / closing operation element can be reliably performed. To do.

More specifically,
The valve operating element may be displaceable between the OFF position and the ON position in a circumferential direction around the longitudinal axis of the fluid passage element.

In another example,
The valve operating element may be displaceable between the OFF position and the ON position in a direction parallel to the longitudinal axis of the fluid passage element. In this case, the portion where the pushing cam contour curve portion and the return cam contour curve portion are slidably engaged with the end portion of the opening / closing operation element to displace the opening / closing operation element is not limited to the curve, and may be a straight line.

In the above valve device,
The opening / closing operation element is a valve body for opening and closing the fluid passage, and the fluid passage is closed when in the closed position, and the fluid passage is opened when in the open position. it can.
In particular,
When the valve body as the opening / closing operation element is in the closed position, the closing portion is sized to close the fluid passage, and when in the open position, the central portion of the fluid passage is disposed in the transverse direction. An opening that extends, the opening being sized to allow fluid to flow through both sides of the opening.

Another example is
The opening / closing operation element is a member for operating a valve body for opening / closing the fluid passage. When the opening / closing operation element is in the closed position, the valve body is set as a fluid passage closed position, and when in the open position, the valve The body can be in a fluid passage open position.

  The present invention is also an air tool for performing work by driving the air motor by receiving compressed air from the outside and supplying the compressed air to the air motor, and includes the above-described valve device, and the fluid passage element of the valve device. There is also provided an air tool adapted to supply compressed air to the air motor through a fluid passage.

  Embodiments of a valve device and an air tool including the valve device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view of a grinder as an air tool in which a valve device according to the present invention is used. FIG. 2 is a partially cutaway plan view of the grinder of FIG. 1, and the disk-shaped polishing member is omitted. 3 is a view showing the valve device of FIG. 1 in a closed state of the fluid passage, (a) is a longitudinal sectional view, (b) is a view taken along line AA in (a), (c). These are the figures seen along the BB line in (a). 4 is a view showing the valve device of FIG. 1 in a fluid passage open state, in which (a) is a longitudinal sectional view, (b) is a view taken along line CC in (a), and (c). These are the figures seen along the DD line in (a). FIG. 5 is a developed view showing the inner surface of the valve operating element by cutting the cylindrical valve operating element in the valve device of FIG. 1 along a line parallel to the longitudinal axis thereof, and (a) is a valve device. (B) shows the inner surface of the valve operating element when the valve operating element is displaced from the state of (a) to bring the valve device into the fluid passage open state. FIG. 6A and 6B show a closed state of the flow passage of the valve device according to the second embodiment of the present invention. FIG. 6A is a longitudinal sectional view, and FIG. 6B is seen along the line AA in FIG. The figure (c) is the figure seen along the BB line in (a). 7A and 7B show the open state of the flow passage of the valve device according to the second embodiment of the present invention, where FIG. 7A is a longitudinal sectional view, and FIG. 7B is seen along the line CC in FIG. FIG. 4C is a view taken along line DD in FIG.

  A grinder 10 shown in FIGS. 1 and 2 includes an air inlet fitting 12 that receives compressed air supplied from a compressed air source (air pump) (not shown), and supply of compressed air to the air motor 14 connected to the air inlet fitting 12. -It has the valve apparatus 16 based on this invention which controls interruption | blocking, and the rotation transmission part 22 which transmits the rotational drive force from the output shaft 18 of the air motor 14 to the disk shaped grinding | polishing member 20. FIG. Since the air motor 14 and the rotation transmission unit 22 of the grinder 10 are widely known, a detailed description thereof will be omitted, and the valve device 16 will be described below.

  3 and 4 show the valve device 16 in a state where the air inlet fitting 12 is connected. The valve device 16 includes a fluid passage element 26 having two cylindrical members 26a and 26b concentrically screwed together and defining a fluid passage 24 from the air inlet fitting 12 to the air motor 14 (FIG. 1). A valve body 27 for opening and closing the fluid passage 24, an elongated rod-shaped opening / closing operation element 28 connected to the valve body 27, and an operation for opening / closing the valve body 27 via the opening / closing operation element 28. And a cylindrical valve operating element 30.

  The valve body 27 has a disk shape, and has a connecting shaft 27a that is fixed at the center and extends forward. The connecting shaft 27a is formed in an opening 28a provided at the center in the length direction of the opening / closing operation element 28. It is slidably inserted. The opening / closing operation element 28 is provided so as to penetrate the fluid passage element 26 in the transverse direction thereof, and its end portions 28b and 28c are respectively a pushing cam contour curve portion 36 provided on the inner peripheral surface of the valve operating element 30. The return cam contour curve portion 38 can be slidably engaged.

The pushing cam contour curve portion 36 and the return cam contour curve portion 38 are configured as follows.
When the valve operating element 30 is rotated clockwise from the position shown in FIG. 3B (OFF position) to the position shown in FIG. 4B (ON position), the pushing cam contour curve portion 36 is opened and closed. 28 is slidably engaged with the end portion 28b of the 28, and the opening / closing operation element 28 is pushed from the position shown in FIG. 3B (closed position) to the position shown in FIG. 4B (open position), thereby The connecting shaft 27a of the valve body 27 is tilted, and the valve body 27 is tilted with a part (upper part in the illustrated example) engaged with the valve seat 34 as shown in FIG. The fluid passage opening position opens the passage 24.
When the valve operating element 30 is rotated counterclockwise from the ON position shown in FIG. 4B to the OFF position shown in FIG. 3B, the return cam contour curve portion 38 is the end portion 28 c of the opening / closing operation element 28. And the opening / closing operation element 28 is returned from the open position shown in FIG. 4B to the closed position shown in FIG. 3B, whereby the connecting shaft 27 a of the valve body 27 is connected to the fluid passage 24. A fluid passage closing position in which the valve body 27 is in full sealing engagement with the valve seat 34 to close the fluid passage 24 as shown in FIG. Become. In this state, the valve body 27 is pressed against the valve seat 34 by the conical coil spring 40 and the sealing engagement with the valve seat 34 is ensured.

  As shown in FIG. 3B, concave portions 36a and 36b are provided at both ends of the pushing cam contour curve portion 36, respectively. The recess 36a receives the end 28b of the opening / closing operation element 28 when the valve operating element 30 is in the OFF position shown in FIG. 3B, and the conical coil spring 40 elastically moves the opening / closing operation element 28 in this state. To support. The recess 36b receives the end 28b of the opening / closing operation element 28 when the valve operating element 30 is in the ON position shown in FIG. 4B, and the conical coil spring 40 elastically moves the opening / closing operation element 28 in this state. The valve operating element 30 is supported to prevent it from being inadvertently rotated to the OFF position.

  In a power drive tool such as a grinder, it is legally required to operate the tool through two steps for safety from the OFF state (non-operating state) to the ON state (operating state). Therefore, in the illustrated grinder 10 as well, as shown in these drawings, the valve operation is changed from the fluid passage closed state (ie, the OFF state) shown in FIG. 3 to the fluid passage open state (ie, the ON state) shown in FIG. The element 30 is first displaced parallel to the longitudinal axis 24x of the fluid passage 24 (in the example shown, the valve operating element 30 is displaced leftward from the state of FIG. 3A to the state of FIG. 4A). (First step), and then, the rotation operation in the circumferential direction around the longitudinal axis 24x of the fluid passage 24 as described above is performed (second step) so as to change from the OFF state to the ON state. Therefore, the valve operating element 30 is urged to the position shown in FIG. 3A by the coil spring 42. When the valve operating element 30 is switched from the OFF state to the ON state, the coil spring 42 is provided with a spring. The operator moves the valve operating element 30 in the axial direction against the force, and then rotates the valve operating element 30. The developed view shown in Fig. 5 is a configuration for performing such a two-step operation. That is, a two-step concave portion 44 for two-step operation is provided on the inner peripheral surface of the valve operating element 30 in addition to the pushing cam contour curve portion 36 and the return cam contour curve portion 38 formed as concave portions. The two-step recess 44 includes an axial recess 44a extending in parallel to the longitudinal axis 24x of the valve operating element 30 and a circumferential recess 44b extending in the circumferential direction connected to the axial recess 44a (see FIG. 3). 4 (c) and FIG. 4 (c)), the regulation pin 46 attached to the fluid passage element 26 is slidably engaged with the two-step recess 44. That is, when the valve operating element 30 is in the OFF position shown in FIG. 1, the restricting pin 46 is in the axial recess 44a, and the restricting pin 46 is moved by moving the valve operating element 30 leftward in the drawing. Enters the circumferential recess 44b to allow the valve operating element 30 to rotate.

  In the valve device 16 according to the second embodiment of the present invention shown in FIG. 6 and FIG. 7, the opening / closing operation element 28 in the valve device 16 according to the first embodiment described above is directly opened and closed by the fluid passage 24. It is formed as. The interaction relationship between the opening / closing operation element, that is, the valve body 28 and the valve operating element 30 is the same as that of the first embodiment. The valve operating element 30 includes a pushing cam contour curve portion 36 and a return cam contour curve portion 38. The valve element 28 can be displaced between a closed position where the fluid passage 24 is closed and an open position where the fluid passage 24 is opened by rotating the valve operating element 30. Specifically, the pushing cam contour curve portion 36 is a curved portion extending in a range of 90 ° counterclockwise from the position where the end portion 28b of the valve body 28 is engaged in FIG. The cam contour curve portion 38 is a curve portion extending in a range of 90 ° counterclockwise from the position where the opposite end portion 28c of the valve body 28 is engaged. The range of 90 ° connecting the push cam contour curve portion 36 and the return cam contour curve portion 38 has a uniform radius, and this portion facilitates the manufacture of the push cam contour curve portion 36 and the return cam contour curve portion 38. It is taken into consideration.

  The valve body 28 is aligned with the fluid passage 24 when the valve body 28 is in the closed position, and has a closing portion 28-1 sized to close the fluid passage 24, and is connected to the closing portion 28-1. An opening 28-2 that is aligned with the fluid passage 24 and allows fluid flow when the valve body 28 is in the open position, and a pushing cam contour curve connected to the opening 28-2. It has a head portion 28-3 slidingly engaged with the portion 36. The opening portion 28-2 is an elongated member that connects the head portion 28-3 and the closing portion 28-1, and when the valve body 28 is in the open position, fluid passes through both sides of the opening portion 28-2. It is a flowing size.

  As mentioned above, although embodiment of the valve apparatus which concerns on this invention was described, this invention is not limited to these, A various deformation | transformation is possible. For example, the valve body 28 in the second embodiment may be plate-shaped like a so-called gate valve, and the opening 28-2 may be provided with an opening having substantially the same area as the fluid passage 24. The valve operating element 30 is rotated to displace the open / close valve element (valve element) 28 between the closed position and the open position. However, the open / close valve element 30 is moved linearly in the axial direction. The same displacement of the (valve element) 28 can be caused.

Grinder (air tool) 10; air inlet fitting 12; air motor 14; valve device 16; output shaft 18; disc-like polishing member 20; rotation transmission part 22; fluid passage 24; longitudinal axis 24x; Valve body 27; Connection shaft 27a; Opening / closing operation element 28; End portions 28b and 28c; Closing portion 28-1; Opening portion 28-2; Head portion 28-3; Valve operating element 30; Push cam contour curve portion 36; return cam contour curve portion 38; conical coil spring 40; coil spring 42; two-step recess 44; axial recess 44a; circumferential recess 44b;

Claims (7)

A fluid passage element having a fluid passage;
Attached to the fluid passage element and displaceable between a closed position for closing the fluid passage and an open position for pushing the fluid passage transversely from the closed position to open the fluid passage. a closing actuating element which is,
The opening / closing operation element that is displaceable between the OFF position and the ON position on the outer peripheral surface of the fluid passage element, and projects outward from the fluid passage element when the fluid passage element is displaced from the ON position to the OFF position. A valve operating element comprising a return cam contour curve portion configured to slidably engage the end of the valve and return the opening / closing operation element from the open position to the closed position;
Disposed fluid passage, a valve body that is strange coordinated manner between the fluid passage opening position to open the fluid passage closed position and fluid passageway for closing the fluid passage, the opening and closing elements A valve body configured to be in the fluid passage closed position when the valve is in the closed position, and to be in the fluid passage open position when the opening / closing operation element is in the open position;
A coil spring that urges the valve body toward the fluid passage closing position;
I have a,
The opening / closing operation element is configured to extend through the fluid passage element in the transverse direction, and is slidably engaged with the return cam contour curve portion, and the other end opposite to the end portion And
When the valve operating element is displaced from the OFF position toward the ON position, the valve operating element is slidably engaged with the other end of the opening / closing operation element to move the opening / closing operation element from the closed position to the open position. A push cam contour curve portion adapted to be displaced to
The pushing cam contour curve portion has a first recess for receiving the other end of the opening / closing operation element when the valve operating element is in the OFF position, and the opening / closing operation element has the other end at the other end. A valve device configured to be elastically supported by the coil spring through the valve body while being received in the first recess .   The pushing cam contour curve portion has a second recess for receiving the other end of the opening / closing operation element when the valve operating element is in the ON position, and the opening / closing operation element has the other end 2. The valve device according to claim 1, wherein the valve device is elastically supported by the coil spring through the valve body while being received in the second recess.   A fluid passage element having a fluid passage;
  Attached to the fluid passage element and displaceable between a closed position for closing the fluid passage and an open position for pushing the fluid passage transversely from the closed position to open the fluid passage. Open / close actuated element,
  The opening / closing operation element that is displaceable between the OFF position and the ON position on the outer peripheral surface of the fluid passage element, and projects outward from the fluid passage element when the fluid passage element is displaced from the ON position to the OFF position. A valve operating element comprising a return cam contour curve portion configured to slidably engage the end of the valve and return the opening / closing operation element from the open position to the closed position;
  A valve body disposed in the fluid passage and adapted to be displaced between a fluid passage closing position for closing the fluid passage and a fluid passage opening position for opening the fluid passage, A valve body configured to be in the fluid passage closed position when in the closed position, and to be in the fluid passage open position when the opening / closing operation element is in the open position;
  A coil spring that urges the valve body toward the fluid passage closing position;
  Have
  The opening / closing operation element is configured to extend through the fluid passage element in the transverse direction, and is slidably engaged with the return cam contour curve portion, and the other end opposite to the end portion And
  When the valve operating element is displaced from the OFF position toward the ON position, the valve operating element is slidably engaged with the other end of the opening / closing operation element to move the opening / closing operation element from the closed position to the open position. A push cam contour curve portion adapted to be displaced to
  The pushing cam contour curve portion has a recess for receiving the other end of the opening / closing operation element when the valve operating element is in the ON position, and the opening / closing operation element has the other end in the recess. A valve device configured to be elastically supported by the coil spring through the valve body in an accepted state.   The opening / closing operation element has an opening penetrating in a direction of a longitudinal axis of the fluid passage;
  The valve body has a connecting shaft that is slidably and tiltably inserted into the opening of the opening / closing operation element and connects the valve body to the opening / closing operation element;
  The valve device according to any one of claims 1 to 3, wherein the valve body is configured to be inclined and displaced between the fluid passage closing position and the fluid passage opening position. The valve according to any one of claims 1 to 4 , wherein the valve operating element is displaceable between the OFF position and the ON position in a circumferential direction about the longitudinal axis of the fluid passage element. apparatus. The valve device according to any one of claims 1 to 4 , wherein the valve operating element is displaceable between the OFF position and the ON position in a direction parallel to a longitudinal axis of the fluid passage element. An air tool that performs an operation by driving the air motor by receiving compressed air from outside and supplying the compressed air to the air motor, comprising the valve device according to any one of claims 1 to 6, An air tool configured to supply compressed air to the air motor through the fluid passage of the fluid passage element.

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