JP2002154344A - Power take off valve operation device and method of mounting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power take off valve operation device compactly constructed and capable of post-attaching electrical parts. SOLUTION: This power take off valve operation device is provided with a conduit tube 8 connected to a power take off valve side fixed member at the one end, an inner wire 9 inserted in the conduit tube 8 and connected to a power take off valve at the one end and capable of push and pull operation, a rod 2 connected to the other end of the inner wire 9, a tubular holder 1 connected to the other end of the conduit tube 8 and slidably guiding the rod 2, and a switch storing box 11 detachably provided on the holder 1 in such a manner of projecting in the radius direction. A window 19 is formed on the bottom wall 18a parting a guide hole 18 in a main body 10 and the switch storing box 11. The switch storing box 11 includes a operation piece 30 embedded in the window 19 and houses a micro switch 5 for lighting warning lamp indicating operation conditions of the power take off valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power take-off valve operating device and a method for mounting the same.

[0002]

2. Description of the Related Art Conventionally, in a construction machine such as a crane, a vehicle, or various industrial machines, a power take-off valve (hereinafter, referred to as a PTO valve) is used to extract the power of an engine. The PTO valve is operated by an operation device using a push-pull control cable for remote operation from a driver's cab or the like.
In this device, the PTO valve can be switched via a cable by pushing and pulling a knob.

[0003] In such a conventional power take-off valve operating device (hereinafter referred to as a PTO operating device), a warning lamp or the like is used to notify the user of forgetting to return the knob by using a warning lamp or the like.
A limit switch for detecting the position of the knob or the operating rod is attached. For example, the PTO operation device shown in FIG. 6 has a holder 102 for attaching a push-pull control cable to an operation panel 101 and the like, and an operation rod 103 for sliding inside the holder 102 to push and pull the inner cable. The operation panel 101 is screwed together with a bracket 105 for mounting the switch 104. And the operating rod 1
03 is provided with a disc-shaped contact member 107 which is in contact with the operating portion 106 of the limit switch 104.

In such a PTO operating device, after a push-pull control cable and a bracket 105 are mounted on a holder 102, a limit switch 104,
The electrical components consisting of the lead wires and the connector can be attached, and the reliability is sufficiently high even in a bad environment such as vibration, but the components such as the bracket 105 and the abutting member 107 protrude greatly and are bulky. .
On the other hand, in choke operating devices such as passenger cars, the operating force of the choke valve is small, and the choke valve urged in the opening direction by a spring is operated by a pull control cable, and fixed inside them. Incorporating a contact and a movable contact in a holder (Japanese Utility Model Publication No. 51-26811 and Japanese Utility Model Application Laid-Open No. 58-1)
Japanese Patent Application Laid-Open No. 52-93827 discloses a method in which a permanent magnet is provided on an operation rod and a reed switch is built in a holder.

[0005] However, even if there is no problem in the case of a light pull control cable, in the case of a relatively heavy push-pull control cable, in particular, mechanical parts and electric parts cannot be separated, so that a switch failure during assembly may occur. And the reliability is not sufficient. Therefore, the configuration of those built-in switches is
It cannot be diverted to an operating device.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a PTO operating device which can be retrofitted with an electric component and which is compact, and a method of mounting the same.

[0007]

SUMMARY OF THE INVENTION A power take-off valve operating device according to the present invention (claim 1) comprises a flexible conduit having one end connected to a fixing member on the power take-off valve side, and a slide in the conduit. A push-pull operable inner cable movably inserted and having one end connected to an actuating member of the power take-off valve; a rod connected to the other end of the inner cable and having a handle at a free end; The other end is connected,
A cylindrical holder that guides the rod slidably in the axial direction, and a switch storage box that is detachably provided so as to protrude in the holder in the radial direction are provided. And a limit switch for detecting a position of a rod through the opening and lighting a warning lamp indicating an operation state of a power take-off valve is housed in the switch storage box. And Note that the limit switch includes a so-called micro switch provided with an actuator for spring return, a micro switch, and the like.

In such a power take-off valve operating device, it is preferable that the opening is a window through which an operating piece of a limit switch passes, and the operating piece is arranged so as to detect an end of the rod. Item 2). Further, the opening may be a slit extending in the axial direction, and the rod may be provided with a projection that enters the slit (claim 3). Further, the holder has a thin cylindrical conduit mounting portion, a guide hole for guiding the rod slidably in the axial direction, and a wall interposed between the conduit mounting portion and the guide hole. Preferably, a small hole is formed for passing an inner cable communicating the guide hole and the conduit mounting portion (claim 4). An engagement step is formed on the outer periphery of the holder, left and right walls for holding the holder are provided above the switch storage box, and the upper ends of the walls are elastically engaged with the engagement step. It is preferable that a locking claw that matches is provided (claim 5).

In the above-described power take-off valve operating device, one end of the conduit is fixed to a holder on the power take-off valve side (operating side), and the holder is attached to the fixing member so as to be freely adjustable in the axial direction. Is preferable (claim 6). A method for mounting the power take-off valve operating device of the present invention (claim 7)
Is a method of assembling such a device, in which a conduit is crimped to a holder on the operating side and a holder on the power take-off valve side (operating side), and both holders are attached to the mating member, and the operating range of the rod is The mounting position of the holder on the power take-off valve side is adjusted based on this, and then a switch storage box containing the limit switch is mounted on the holder.

[0010]

In the power take-off valve operating device according to the present invention, the terminal in the limit switch is turned on and off via the opening for communicating the position of the rod with the main body of the holder and the switch housing box. For example, when the limit switch detects that the power take-off valve that is pushing the handle is OFF, the warning lamp is turned off, and when the handle is pulled out, the rod is pulled out and the limit switch detects and turns on the warning lamp. Let it. As described above, in the power take-off valve operating device of the present invention, since the limit switch directly detects the position of the rod, a disk-shaped abutment plate or bracket as in the conventional PTO operating device is not required, and the whole is extremely extremely. It can be made compact. Further, since the switch storage box is detachable from the holder, the switch storage box storing the limit switch can be mounted after the mechanical parts are mounted. Therefore, handling of mechanical parts is easy and not bulky, and electric parts such as limit switches are hardly damaged. In addition, a reliable general-purpose product can be used.

When the opening is a window through which the operating piece of the limit switch passes, and the operating piece is arranged to detect the end of the rod (claim 2), when the rod is pushed in, The tip of the operation piece protruding from the window is in contact with the outer periphery of the rod. Then, when the handle is pulled to operate the PTO valve, the rod slides in the holder, and the tip of the operation piece of the limit switch is separated from the rod. The operation state of the power take-off valve can be detected from the movement of the operating piece. In the device in which the opening is a slit extending in the axial direction and the rod is provided with a protrusion that enters the slit (claim 3), the position of the protrusion that moves as the rod moves can be detected by a limit switch. it can. At this time, the holder body guides the rod in the axial direction, and the protrusion moves in the slit, whereby rotation around the axis is restricted, and the inner cable is less likely to be twisted. The width of the slit is preferably smaller than the diameter of the inner cable, so that when a compressive force is applied to the inner cable, the slit does not enter the slit. The holder includes a thin cylindrical conduit mounting portion, a guide hole for guiding the rod slidably in the axial direction, and a wall portion interposed between the conduit mounting portion and the guide hole. In the power take-off valve operating device having a small hole for passing an inner cable communicating the guide hole and the conduit mounting portion (claim 4), the conduit supporting the reaction force of the inner cable for pushing and pulling is securely held. Can be held. In addition, buckling does not easily occur in the inner cable.

An engaging step is formed on the outer periphery of the holder, left and right walls for holding the holder are provided above the switch storage box, and the engaging step and the elastic step are provided at the upper ends of the walls. In the power take-off valve operating device provided with a locking claw that engages with the holder, the locking claw is resiliently engaged with the engaging step by simply pressing the switch storage box against the holder in the radial direction. Engages. Therefore, the limit switch can be mounted more easily later, and replacement is easy. Further, if the limit switch is mounted with two screws penetrating the switch housing, even if there is a gap between the limit switch and the side wall, the limit switch can be mounted stably and reliably.

In the case where the holder on the power take-off valve side of the conduit is provided on the fixing member so as to be freely adjustable, the position of the holder with respect to the fixing member can be adjusted according to the operating range of the rod. Therefore, the operating range of the rod can be appropriately adjusted. According to the power take-off valve mounting method of the present invention, since the switch housing is inserted after the mechanical parts are assembled and adjusted, electric parts such as limit switches are less damaged. In addition, a reliable general-purpose product can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a power take-off valve operating device according to the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the operating side of the PTO operating device of the present invention. FIG.
2b is a partially cutaway perspective view of the holder in FIG.
3A and 3B are sectional views taken along the line II in FIG.
FIG. 4 is a cross-sectional view showing an assembled state and an operating state of the TO operating device, FIG. 4 is a partial cross-sectional side view showing an entire embodiment of the PTO operating device of the present invention, and FIG. 5 is another embodiment of the PTO operating device of the present invention. It is principal part sectional drawing which shows the operation side of embodiment.

FIG. 1 shows an operation side A of the PTO operation device shown in FIG. 4. The operation side A (control cable with switch) includes a holder 1, a rod 2, and a push-pull control cable (hereinafter, a control cable). 3) and electrical components including a microswitch 5, a lead wire 6, and a connector 7. The control cable 3 slides in the conduit 8 and the conduit 8, and an inner cable 9 for transmitting a push-pull force.
It is a known thing consisting of: Further, the microswitch 5 is stored in a switch storage box 11.

The distal end of the holder 1 is a thin cylindrical conduit mounting portion 12 for caulking and fixing the conduit 8, and the outer periphery of the rear end is used to mount the holder 1 to a mating member such as the operation panel P. The screw 15 for the nut 13 and the end nut 14 is cut off. A wall 16 is provided near the tip of the holder 1 so as to block the axis, and a small hole 17 through which the inner cable 9 passes is formed in the wall 16. A guide hole 18 for guiding the rod 2 slidably in the axial direction is formed on the front side of the wall portion 16. The guide hole 18 and the inside of the switch storage box 11 are separated by a bottom wall 18a, and a rectangular window 19 is opened in the bottom wall 18a. 2a and 2
As shown in FIG. 2B, a pair of left and right concave grooves 20 is formed in the outer periphery of the holder 1 at a substantially central portion in the vertical direction or at a somewhat upper side thereof so as to extend in the axial direction.
A rectangular locking recess 21 is formed in the lower part of the front part. The concave groove 20 and the locking concave portion 21 are the locking step portion according to claim 5. The rod 2 is, for example, a rod having a circular cross section or a hexagonal cross section. That is, the diameter of the rod 2 is larger than that of the inner cable.

As shown in FIGS. 2A and 2B, the switch storage box 11 is composed of two rectangular side walls 22 and 23 extending in the axial direction and an end wall 24 closing the front end. It is formed of a material having elasticity such as. The upper end side of the switch storage box 11 is opened so as to hold the holder 1, and the rear end side is opened to pass the lead wire 6. Inside the upper ends of the side walls 22 and 23, a pair of first locking claws 25 elastically engaged with the concave grooves 20 of the holder 1 are provided.
Is protruding. The first locking claw 25 extends in the axial direction. In the vicinity of the end wall 24, a second locking claw 26 that elastically engages with the locking recess 21 of the holder 1 is formed. In the end wall 24, a contour corresponding to the outer shape of the holder 1, for example, an arc-shaped notch 27 is formed. The micro switch 5 is provided on the left and right side walls 22 and 23.
A hole 28a through which the screw 28 for attaching the hole 28 is inserted is formed.

Returning to FIG. 1, the end nut 14 screwed into the end of the holder 1 has an O-ring 29 for slidingly contacting the surface of the rod 2 for sealing.
Is a toothed washer.

The microswitch 5 is, for example, a commercially available one having a roller lever type operation piece 30, and a roller 31 is rotatably attached to the tip of the operation piece 30. Further, the microswitch 5 is attached to the connector 7 by its common terminal COM, normally open terminal NO, and normally closed terminal NC. The connector 7 is made of a synthetic resin such as polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS), and internally has terminal plates 33 and 34 connected to the normally open terminal NO (or normally closed terminal NC) and the common terminal COM. Embedded. Lead wires 6a, 6b extending to the outside from the rear end of the connector 7 are connected to the terminal plates 33, 34.

In order to attach the operating side A, which is divided into mechanical parts and electrical parts as described above, to the mating member, first attach the mechanical component to the mating member, and push and pull the rod 2 to move the stroke end. And the operating range of the partner device (for example, a PTO valve) is adjusted. Next, the microswitch 5 and the connector 7 are stored in the switch storage box 11, and the upper opening of the switch storage box 11 is pressed against the holder 11. Then, the side walls 22 and 23 provided with the first locking claws 25 are bent outward, and the first locking claws 25 are elastically engaged in the concave grooves 20. FIG. 3
As shown in FIG. 2A and FIG. 2B, the switch storage box 11 can be attached to the holder 1. As described above, the operating side A can assemble the mechanical parts and the electric parts separately, so that adjustment and testing can be performed individually, which is convenient. Moreover, there is little risk of damaging the electrical parts during assembly.

In the state assembled as described above, FIG.
As shown in the figure, the roller 31 of the operating piece 30 of the microswitch 5 has entered the inside of the window 19. Therefore, the roller 31 is moved in the guide hole 1 in a state where the operating piece 30 is pushed radially outward (in the direction of arrow B) against the urging force of the return spring.
8 is in contact with the surface of the rod 2 which has been pushed all the way back. As shown in FIG. 3B, when the rod 2 is pulled out of the holder 1 (in the direction of arrow C) and the inner cable 9 is pulled, when the end surface 38 of the rod 2 comes to the left side of the roller 31 in the figure, the operation is started. The roller 31 returns radially inward (in the direction of arrow D) by the return force of the piece 30 and enters the guide hole 18. Thereby, the micro switch 5 is operated. Conversely, from this state, the rod 2 is pushed in the direction of arrow E to
, The roller 3 is moved by the end face 38 of the rod 2.
1 is extruded in the direction of arrow B (see FIG. 3a). Whether the lead wires 6a and 6b are short-circuited or opened when the roller 31 comes inside can be selected by connecting the lead wire 6a to the normally closed terminal NC or the normally open terminal NO. it can. The other lead wire is connected to the common terminal COM.

In the above-described operation, the rod 2 is pushed and pulled, but as is clear from FIGS. 3A and 3B, the rod 2 can be moved by pushing and pulling the other end of the inner cable 9. The microswitch 5 can be switched in the same manner. Further, as shown in FIG. 3A, a step portion 39 is formed on the rear end side of the holder 1 so as to abut on the switch storage boxes 11 to securely support them.

Although the roller switch type micro switch 5 is employed as the limit switch in the above embodiment, other types of limit switches such as a push-in type micro switch may be employed. Also, the difference in radius between the rod 2 and the inner cable 9, ie, the step (y in FIG. 3b)
The larger the value is, the easier it is to detect by the limit switch, but the possibility of buckling of the inner cable 9 increases. Therefore, although it depends on the diameter of the inner cable 9 and the stroke of the rod 2, the step is preferably about 2.0 to 3.0 mm.

Next, an embodiment of a PTO operation device K to which the operation side A is applied will be described with reference to FIG. The operating side K1 of the device K in FIG. 4 is the same as the operating side A in FIGS. 1 to 3 except that a hexagonal rod is used as the rod 2 and a handle 40 is attached to the free end thereof, and therefore the same portion is used. The same reference numerals are given and the description is omitted. The operating side K2 of the device K is substantially the same as that of the conventional PTO operating device. That is, the mounting nut 4 to the fixing member P2
1 and 42 have a cylindrical holder 43 screwed together, and the conduit 8 is crimped to a conduit mounting portion 44 of the holder 43. A guide pipe 4 is provided at the other end of the holder 43.
5 is swingably connected, and its guide pipe 4
A rod 46 is slidably inserted into 5. An inner cable 9 is crimped on the proximal end side (left side in the drawing) of the rod 46, and a joint 47 connected to the PTO valve is screwed on the distal end side. Reference numeral 48 denotes a known bellows boot, and 49 denotes a grommet.

In the PTO operating device K configured as described above, the handle 40 on the operating side is always pushed in the direction of the arrow E, and this is a state where the PTO valve is pushed. In this state, when the handle 40 is pulled in the direction of arrow C and the rod 2 is pulled out of the holder 1, the rod 45 on the operating side is pulled in the direction of arrow C2 via the inner cable 9, and the PTO valve is pulled. Thereby, the power of the engine is extracted from the vehicle to the device. At that time, the micro switch 5 is ON
And a signal is sent to the safety device through the lead wire 6,
Turn on the lighting lamp. This informs the driver that the PTO valve has been switched.

Then, when the operation of the device is completed, the handle 4
0 is pushed in, and the rod 46 on the operating side extends through the inner cable 9 in the direction of arrow E2. As a result, the PTO valve is switched, and the a contact of the microswitch 5 is turned off.
It becomes F and the warning lamp goes out. Also in the PTO operation device K, the electric components can be assembled after the mechanical components are assembled and adjusted, and the operation of the limit switch is highly reliable and the risk of failure during the installation is small. The advantage of side A is provided as it is.

On the operating side A1 of the PTO operating device shown in FIG. 5, a slit 51 extending in the axial direction and opening in the radial direction is formed in the bottom wall 18a of the holder 1. Slit 5
The width of 1 is smaller than the diameter of the inner cable 9 and usually 1/3 to 2
/ 3. Further downward from the tip of the rod 2,
The protruding piece 52 protrudes. The protruding piece 52 is a slit 51
It is a thin plate that slides inside. However, it may be pin-shaped. The tip of the protruding piece 52 may enter the switch storage box 11 or may extend partway. When the protruding piece 52 protrudes halfway through the slit 51, the roller 31 of the operating piece 30 has entered the slit 51. On the other hand, when the tip of the protruding piece 52 penetrates into the switch storage box 11, the roller 31 does not need to enter the slit 51.

In the assembled state, the projecting piece 52 at the tip of the rod 2 enters the slit 51, projects toward the microswitch 5, and is in contact with the roller 31 of the operating piece 30. Therefore, the operation piece 30 is pushed radially outward (the direction of arrow B) against the urging force of the return spring.
When the rod 2 is pulled out of the holder 1 (in the direction of arrow C) and the inner cable 9 is pulled, the protruding piece 52 moves to the left side in the figure and moves away from the roller 31, so that the operating piece 3
The roller 31 is radially inward with a return force of 0 (in the direction of arrow D).
Return to Thereby, the micro switch 5 is operated. Conversely, if the rod 2 is pushed in the direction of arrow E and the inner cable 9 is pushed from that state, the roller 31 is pushed in the direction of arrow B by the protruding piece 52 of the rod 2 and the switch is switched.
In this case, the rod 2 does not rotate in the axial direction due to the engagement between the protruding piece 52 and the slit 51 even if the rod 2 is not formed into a prismatic shape such as a hexagonal shape, but is cylindrical. Therefore, there is an advantage that the inner cable 9 is not easily twisted.

[0029]

According to the PTO operating device of the present invention, the movement of the rod can be directly detected by the limit switch through the opening formed in the main body of the holder. Therefore, unlike the conventional device, a disk or a large bracket is not required, and therefore, the circumference of the switch can be made small. In addition, since there is a switch storage box for accommodating the limit switch so that it can be retrofitted, it is possible to assemble electrical components after assembling and adjusting mechanical components. Therefore, failure of electric parts is small. In addition, since a commercially available independent limit switch can be used, the reliability is high. According to the mounting method of the PTO operation device of the present invention, the failure of the electric component is small.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view before assembling showing one embodiment of an operation side of a PTO operation device of the present invention.

2A is a partially cutaway perspective view of a holder in FIG. 1, and FIG. 2B is a sectional view taken along line II-II in FIG.

FIG. 3a and FIG. 3b each show a PT of the present invention.
It is sectional drawing which shows the assembly state and operation state of other embodiment of O operation device.

FIG. 4 is a partial cross-sectional side view showing the whole of the embodiment of the PTO operation device of the present invention.

FIG. 5 is a sectional view of a main part before assembling showing another embodiment of the operation side of the PTO operation device of the present invention.

FIG. 6 is a partially sectional side view showing an example of an operation side of a conventional PTO operation device.

[Explanation of symbols]

 A Operation side 1 Holder 2 Rod 3 Control cable 5 Micro switch 6 Lead wire 7 Connector 8 Conduit 9 Inner cable 11 Switch storage box 12 Conduit mounting part 13 Nut 14 End nut 15 Screw 16 Wall part 17 Small hole 18 Guide hole 18a Bottom wall DESCRIPTION OF SYMBOLS 19 Window 20 Ridge 21 Locking concave part 22, 23 Side wall 24 End wall 25 First locking claw 26 Second locking claw 27 Notch 28 Screw 28a Hole 29 O-ring 29a Toothed washer 30 Working piece 31 Roller 32 Connector 33, 34 Terminal plate 33 Boot K PTO operating device K1 Operating side K2 Operating side 36 Screw 37 Nut 38 End surface 39 Stepped portion 40 Handle 41, 42 Nut 43 Holder 44 Pipe mounting part 45 Guide pipe 46 Rod 47 Joint 48 Bellows boot 49 Grommet DOO 51 slit 52 protruding pieces

Claims (7)

[Claims] 1. An operating device for remotely controlling the opening and closing of a power take-off valve, the flexible conduit having one end connected to a fixing member on the power take-off valve side, and slidable in the conduit. And a push-pull operable inner cable connected at one end to an actuating member of the power take-off valve, a rod connected to the other end of the inner cable and having a handle at a free end, and the other end of the conduit Are connected, a cylindrical holder that guides the rod slidably in the axial direction, and a switch storage box that is detachably provided so as to protrude radially from the holder. An opening communicating with the switch storage box is formed, and in the switch storage box, a position of a rod is detected through the opening to indicate an operation state of the power take-off valve. A power take-off valve operating device containing a limit switch that turns on a warning lamp. 2. The power take-off valve operating device according to claim 1, wherein the opening is a window through which an operating piece of a limit switch passes, and the operating piece is arranged to detect an end of the rod. 3. The power take-off valve operating device according to claim 1, wherein the opening is a slit extending in the axial direction, and the rod is provided with a projection that enters the slit. 4. The holder includes a thin cylindrical conduit mounting portion, a guide hole for guiding a rod slidably in an axial direction, and a wall interposed between the conduit mounting portion and the guide hole. 2. The power take-off valve operating device according to claim 1, wherein a small hole for passing an inner cable communicating the guide hole and the conduit mounting portion is formed in the wall portion. 5. An engaging step is formed on the outer periphery of the holder, left and right walls for holding the holder are provided above the switch storage box, and the engaging step is provided at the upper end of the wall. The power take-off valve operating device according to claim 1, further comprising a locking claw that elastically engages. 6. The power take-off valve operating device according to claim 1, wherein one end of the conduit is fixed to a holder on the side of the power take-off valve, and the holder is attached to the fixing member so as to be adjustable in the axial direction. 7. The method for mounting a power take-off valve operating device according to claim 1, wherein the conduit is caulked to a holder on the operation side and a holder on the power take-off valve side, and both holders are mounted on the mating member. A method for mounting a power take-off valve operating device, comprising adjusting a mounting position of a holder on a power take-off valve side based on a rod operating range, and then mounting a switch storage box containing a limit switch to the holder.