JPH0534991Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention particularly relates to a power extraction device for an automobile that can extract power from a transmission of a specially equipped vehicle such as a dump truck.

BACKGROUND ART Conventional power extraction devices for automobiles provide a window on the side of a transmission, attach a gearbox to the window, and mesh a gear mechanism in the gearbox with a counter gear or reverse idler of the transmission to extract power. By freely connecting and disconnecting the gear mechanism and the output shaft via a clutch, and connecting the output shaft to a drive shaft with a universal joint,
It drove the hydraulic pumps that raise and lower the loading platform of dump trucks.

Problems that the invention aims to solve However, with conventional automobile power take-off devices,
Power connection and disconnection, as well as lifting, stopping, and lowering of the loading platform, are performed by operating the shift rod and switching valve of the power take-off device using the operating lever in the driver's cab. In particular, in dump trucks such as light cars and medium-sized cars, when moving the operating lever from the stop position to the raised position or from the raised position to the stop position to raise the loading platform in small increments, the clutch pedal must be depressed. The work is cumbersome as it is necessary to frequently depress the clutch pedal in the driver's seat to operate the clutch and repeatedly switch the valve in order to perform inching. There are some that allow you to repeat this using a control lever, but
Most of these require complicated link mechanisms and cables, or have hydraulic pumps, switching valves, etc. built into the gearbox, so their structures are complicated.

The purpose of the present invention is to address the above-mentioned problems and to
The switching lever switches the valve to three positions: down, neutral, and up, and the interlocking lever connects and disconnects the gear mechanism and the output shaft, and the switching lever switches the valve from the down position to the neutral position or from the up position to the neutral position. Even when the switching lever is switched to the lower position, the interlocking lever does not move because the switching lever has an idle path, and between the lowered position and the neutral position of the valve, once the valve is set to the lowered position, the gear mechanism and output shaft do not move. If the valve remains in the disconnected state and the valve is repeatedly moved between the neutral position and the lowered position using the switching lever, the loading platform will lower in small increments, eliminating the need to operate the clutch by depressing the clutch pedal in the driver's cab. , between the raised position and the neutral position of the valve, once the valve is in the raised position, the gear mechanism and the output shaft remain connected, and the switching lever is used to move the valve between the neutral position and the raised position. As the cargo platform is moved repeatedly, it rises little by little, eliminating the need to depress the clutch pedal in the driver's cab to operate the clutch, eliminating the need for complicated link mechanisms and cables, and eliminating the need for a hydraulic pump or a hydraulic pump inside the gearbox. To provide a power take-off device for an automobile that does not require incorporating a switching valve and has a simple structure.

Means for Solving the Problems The power take-off device for a car of the present invention is a power take-off device for a car in which a gear mechanism of a gear box provided in a transmission and an output shaft are connected in a disconnectable manner. A switching lever is provided that allows the vertical switching valve to be freely switched to three positions of lowering, neutral, and rising of the automobile loading platform, and an interlocking lever is provided for connecting and disconnecting the gear mechanism and the output shaft, and the switching lever and the interlocking lever are provided. and when the switching lever does not move the interlocking lever when switching the switching lever from the lowered position to the neutral position and from the raised position to the neutral position, and when switching the switching lever from the neutral position to the raised position and the lowered position, In order to move the interlocking lever, a support pin provided on one side of the interlocking lever is fitted into a guide hole provided on the other side via a play path.

Function The gear mechanism installed inside the gearbox of the transmission rotates while meshing with the gears of the transmission, and the switching lever installed outside the gearbox switches the valve to three positions: down, neutral, and up. , the interlocking lever connects and disconnects the gear mechanism and the output shaft.

Furthermore, even if the valve is switched from the lowered position to the neutral position and from the raised position to the neutral position using the switching lever, the switching lever is on the play path and does not move the interlocking lever, so that the valve does not move between the lowered position and the neutral position. When the valve is in the lower position, the gear mechanism and the output shaft remain disconnected, and between the raised position and the neutral position, the gear mechanism and the output shaft are connected once the valve is in the raised position. The valve remains in this state, and the valve is repeatedly moved between the neutral position and the raised position by the switching lever without the need for clutch operation from the driver's cab, and the loading platform is raised little by little.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 is a casing of a transmission, a window hole 2 is provided in the casing 1, a subshaft 3 is rotatably provided inside the casing 1, and a window hole 2 is provided in the subshaft 3. A counter gear 4 is provided at a position corresponding to the hole 2.

A gear box 6 of a power take-off (hereinafter referred to as PTO) 5 is installed in the window hole 2 of the casing 1 of the transmission.
is installed, and gearbox 6 of PTO5 is installed.
A gear mechanism 7 that meshes with the counter gear 4 of the transmission is disposed inside the gear mechanism 7 of the gear box 6.
and the output shaft 8 are connected to each other in a freely disconnectable and disconnectable manner via a sleeve 9 which serves as a clutch, and a switching lever 10 is provided outside the gear box 6 that allows the loading platform vertical switching valve 49 to be freely switched to three positions: downward, neutral, and upward. At the bottom of the switching lever 10, an interlocking lever 43 for connecting and disconnecting the gear mechanism 7 and the output shaft 8 is swingably provided.

A gear mechanism 7 housed inside a gear box 6 of the PTO 5 includes a driven gear 11 that constantly meshes with the counter gear 4 and a drive gear 1 that constantly meshes with the driven gear 11.
It consists of 2.

The gearbox 6 of the PTO 5 is formed with an insertion port 13 that opens on the side and into which the output shaft 8 is inserted, and the lower part of the mounting part 6a of the gearbox 6 has a protrusion that is inserted into the window hole 2 of the casing 1 of the transmission. Part 1
4 is formed in the protrusion 14, and an opening 15 that intersects with the insertion hole 13 and opens downward is formed in the protrusion 14, and support holes 16 are formed on both sides of the protrusion 14 in parallel to the axial direction of the output shaft 8. It is provided.

A support shaft 17 is inserted through the support hole 16 of the protrusion 14 of the gearbox 6, and the support shaft 17 is fixed to the gearbox 6 by a pin 18. is rotatably mounted.

There is an insertion hole 1 inside the gear box 6 of the PTO 5.
Fitting portions 20, 20 are formed in communication with the gear box 6, and the supporting shaft portions 22, 2 of the output shaft 8 are connected to the fitting portions 20, 20 of the gear box 6 via a plurality of radial ball bearings 21.
A radial ball bearing 2 is rotatably attached to the fitting part 20 near the insertion opening 13 of the gear box 6.
An oil seal 23 is provided on the side of the gearbox 6, and the support shaft 22 of the output shaft 8 on the side of the insertion port 13 of the gearbox 6
An involute spline 24 is formed at the tip of the involute spline 24 , a joint 25 is fitted and fixed to the involute spline 24 , and a drive shaft 29 of a hydraulic pump 28 is connected to the joint 25 .

A fitting support portion 30 and an external tooth portion 31 are formed between the support shaft portions 22 and 22 of the output shaft 8, respectively, and a plurality of needle roller bearings 3 are formed in the fitting support portion 30 of the output shaft 8.
A drive gear 12 is rotatably attached via 2, and external teeth 33 are integrally formed on one side of the drive gear 12.

A sleeve 9 is provided on the external toothed portion 31 of the output shaft 8 so as to be slidable in the axial direction of the output shaft 8, an annular groove 34 is formed on the outer circumferential surface of the sleeve 9, and an output groove is formed on the inner circumferential surface of the sleeve 9. Internal teeth 3 meshing with external tooth portion 31 of shaft 8
5 is formed, and a plurality of fitting parts 36 are formed in the internal teeth 35 of the sleeve 9, and by moving the sleeve 9 in the direction of the drive gear 12 with respect to the output shaft 8, the internal teeth 25 of the sleeve 9 are formed. It is designed to mesh with the external teeth 33 of the drive gear 12.

A fitting hole 37 is formed in the external toothed portion 31 of the output shaft 8 so as to intersect with the axis of the output shaft 8, and a detent ball 38 that fits into the fitting portion 36 of the sleeve 9 is provided inside the fitting hole 37. Stored, day tent ball 38
At the bottom of the spring 3 is a spring 3 that constantly biases the detent ball 38 toward the fitting portion 36 of the sleeve 9.
9 is provided, and the detent ball 38 is fitted into the fitting portion 36 of the sleeve 9 to prevent movement of the sleeve 9 relative to the output shaft 8.

PTO installed in casing 1 of this transmission
The configuration of No. 5 is similar to the conventional one.

As shown in FIG. 2, a through hole 40 is bored in the upper wall of the gear box 6 of the PTO 5, and a rotary shaft 41 is rotatably supported in the through hole 40 of the gear box 6. A fitting support 42 of the switching lever 10 is rotatably supported on the side, and the switching lever 10 is rotatably supported near the center of the rotating shaft 41 in the longitudinal direction.
A fitting support 44 of the interlocking lever 43 is fixed to the lower part of the lever 43 by a pin 45, and an operating piece 46 is fixed near its lower end, and the end of the operating piece 46 engages with the annular groove 34 of the sleeve 9. An engaging body 47 is provided.

As shown in FIG. 3, the switching lever 10 provided outside the gearbox 6 of the PTO 5 is provided with an engagement hole 48 consisting of a long hole near one side edge 10a near the center in the longitudinal direction. One side edge 10
a is fitted into an engagement groove 51 formed at the tip of a spool 50 of the switching valve 49, and the tip of the spool 50 of the switching valve 49 is connected to the engagement hole 48 of the switching lever 10 via an engagement pin 52. The switching valve 49 is connected to a hydraulic cylinder (not shown) that tilts the loading platform of the dump truck.

One side edge 1 near the longitudinal center of the switching lever 10
A guide hole 53 made of a slightly bent elongated hole is provided between the switching lever 1 and the other side edge 10b.
The upper end of a support pin 54 fixed to the tip of the interlocking lever 43 is fitted into the guide hole 53 of 0, and both ends 53a, 53b of the guide hole 53 of the switching lever 10 and the outer peripheral surface of the support pin 54 of the interlock lever 43 are connected to each other. A play path 55 is formed between them, and a continuous hole 56 is provided at the tip of the switching lever 10, and the continuous hole 56 of the switching lever 10 is connected to an operating lever in the driver's cab via a cable (not shown) or the like. ing.

The switching lever 10 and the interlocking lever 43 are connected via a play path 55 so that the switching lever 10 does not move the interlocking lever 43 when switching the switching lever 10 from the lowered position to the neutral position and from the raised position to the neutral position. There is.

Next, the operation of this embodiment will be explained.

When the subshaft 3 in the casing 1 of the transmission rotates, the driven gear 11 in the gearbox 6 of the PTO 5 rotates.
supports the support shaft 1 while meshing with the counter gear 4 of the counter shaft 3.
7 in the direction of the arrow a in FIG.
Rotate in the direction.

When the operating lever in the driver's cab is in the lower position of the loading platform, the switching lever 10 provided outside the gear box 6 of the PTO 5 is in the lower position (hereinafter referred to as D) in FIG. 4, and the support pin 54 at the tip of the interlocking lever 43
is the guide hole 5 near the other side edge 10b of the switching lever 10.
3, and the detent ball 38 of the external toothed portion 31 of the output shaft 8 fits into the fitting portion 36 on the inner peripheral surface of the sleeve 9 near the drive gear 12 as shown in FIG. The sleeve 9 is fixed to the external toothed part 31 of the output shaft 8 by a detent ball 38, and the sleeve 9 meshes with the external toothed part 31 of the output shaft 8.
The internal teeth 35 of the drive gear 12 do not mesh with the external teeth 33 of the drive gear 12, and the rotation of the drive gear 12 is not transmitted to the output shaft 8 via the sleeve 9, and the hydraulic pump 2
8 is in a stopped state, and the loading platform of the dump truck is lowering due to its own weight.

Next, when the control lever in the operator's cab is manually moved from the lowered position of the loading platform to the stop position, the switching lever 10 outside the gearbox 6 of the PTO 5 moves from the D position in Fig. 4 to the neutral position (hereinafter referred to as N), and the switching lever is moved. The lever 10 rotates clockwise in FIG. 4 with respect to the rotating shaft 41, and the spool 50 of the switching valve 49 moves in the direction in which it projects through the engagement pin 52 that engages with the engagement hole 48 of the switching lever 10. At the same time, the support pin 54 at the tip of the interlocking lever 43 passes through the play path 55 and touches the one side edge 10a of the switching lever 10.
Located at the other end 53b of the guide hole 53, the interlocking lever 43 does not rotate together with the switching lever 10, and the hydraulic pump 28 remains in a stopped state.

Next, after depressing the clutch pedal in the driver's cab with your foot to operate the clutch, move the operating lever in the driver's cab by hand from the stop position of the loading platform to the raised position, and the switching lever 10 outside the gearbox 6 of the PTO 5 will switch to the fourth position. From the N position in the figure to the ascending position (hereinafter referred to as U)
), and the switching lever 10 moves to the rotation axis 4.
1 in the clockwise direction in FIG. The lever 43 rotates together with the switching lever 10 via the support pin 54 that engages with the other end 53b of the guide hole 53 of the switching lever 10, and the rotating shaft 41 rotates with the interlocking lever 43 relative to the through hole 40 of the gearbox 6. move.

Then, the engaging body 47 of the operation piece 46 at the lower end of the rotating shaft 41 moves the sleeve 9 toward the drive gear 12, and the internal teeth 35 of the sleeve 9 engage the external teeth 3 of the output shaft 8.
The detent ball 38 moves while being pushed into the fitting hole 37 of the sleeve 9 against the biasing force of the spring 39, and the detent ball 38 moves into the fitting part 36 on the inner peripheral surface of the sleeve 9 on the side opposite to the drive gear 12. At the same time, the sleeve 9 is fixed to the external teeth 31 of the output shaft 8 by the detent ball 38, and the sleeve
The inner teeth 35 of the sleeve 9 mesh with the outer teeth 33 of the drive gear 12, and the rotation of the drive gear 12 is transmitted to the output shaft 8 via the sleeve 9.
The output shaft 8 rotates a drive shaft 29 of a hydraulic pump 28 through a joint 25, and the hydraulic pump 28 is operated to operate a dump truck through a switching valve 49. Raise the loading platform.

Furthermore, when the switching lever inside the operator's cab is manually moved from the lifting position of the loading platform to the stop position, the switching lever 10 outside the gearbox 6 of the PTO 5 moves from the U position to the N position as shown in FIG. 41 in the counterclockwise direction in FIG. The support pin 54 at the tip of the lever 43 passes through the play path 55 and is located at one end 53a of the guide hole 53 of the switching lever 10, so that the interlocking lever 43 does not rotate together with the switching lever 10, and the hydraulic pump 28 is in the operating state. It will remain as it is.

Next, after depressing the clutch pedal in the driver's cab with your foot to operate the clutch, move the operating lever in the driver's cab by hand from the stop position of the loading platform to the lowering position. The switching lever 10 rotates counterclockwise in FIG. 4 relative to the rotating shaft 41, and the spool 50 of the switching valve 49 engages with the engagement hole 48 of the switching lever 10. At the same time, the interlocking lever 43 moves to the most retracted state via the engagement pin 52
The rotary shaft 41 rotates together with the switching lever 10 through the support pin 54 that engages with the other end 53b of the guide hole 53, and the rotating shaft 41 rotates with the interlocking lever 43 relative to the through hole 40 of the gearbox 6.

Then, when the engaging body 47 of the operating piece 46 at the lower end of the rotating shaft 41 moves the sleeve 9 in the direction opposite to the drive gear 12, the internal teeth 35 of the sleeve 9 engage the external teeth 31 of the output shaft 8. A spring 3 is inserted into the insertion hole 37.
The detent ball 38 moves while being pushed against the biasing force of the detent ball 38, and the detent ball 38
At the same time, the sleeve 9 is fitted into the fitting part 36 on the inner peripheral surface of the drive gear 12, and the sleeve 9 is fixed to the external toothed part 31 of the output shaft 8 by the detent ball 38. The internal teeth 35 of the sleeve 9 that mesh with the teeth 31 are disengaged from the external teeth 33 of the drive gear 12, and the rotation of the drive gear 12 is transmitted to the output shaft 8 via the sleeve 9. First, the hydraulic pump 28 comes to a halt, and the platform of the dump truck descends under its own weight.

In addition, the switching lever and interlocking lever are removed from the rotary shaft that is rotatably supported in the through hole in the upper wall of the PTO gearbox in the above embodiment, and another switching lever is installed near the upper end of the rotating shaft. Remove the joint connected to the involute spline of the output shaft, remove the hydraulic pump together with the joint from the output shaft, remove the switching valve from the switching lever, and connect the generator to the involute spline of the output shaft via another joint. By connecting the drive shafts, the PTO can be used for a variety of purposes.

FIG. 5 shows another embodiment of the present invention, in which a window hole 66 is provided in a casing 65 of the transmission, and a sub-assembly is provided inside the casing 65 as in the embodiment shown in FIG. A shaft 3 is rotatably provided, and a counter gear 4 is provided on the counter shaft 3 at a position corresponding to the window hole 66.

The window hole 66 of the transmission casing 65 has a PTO
67 gearbox 68 is installed,
A gear mechanism 69 that meshes with the counter gear 4 of the transmission is disposed inside the gear box 68 of the PTO 67, and the gear mechanism 69 of the gear box 68 and the output shaft 7
0 is freely connected to and disconnected from the gearbox 68 through a sleeve 71 that serves as a clutch, and a switching lever 72 that can freely swing the switching valve 49 to three positions (down, neutral, and up) is located outside the gear box 68. A gear mechanism 69 is provided at the bottom of the switching lever 72.
An interlocking lever 110 that connects and disconnects the output shaft 70 and the output shaft 70 is movably provided.

A gear mechanism 69 housed inside a gear box 68 of the PTO 67 is composed of a driven gear 73 that constantly meshes with the counter gear 4 and a drive gear 74 that constantly meshes with the driven gear 73.

The gearbox 68 of the PTO 67 is formed with an insertion hole 75 that opens on one side and into which the output shaft 70 is inserted, and the lower part of the mounting part 68a of the gearbox 68 has a protrusion that is inserted into the window hole 66 of the casing 65 of the transmission. An opening 77 is formed in the protruding part 76 and opens downward to intersect with the insertion hole 75. On both sides of the protruding part 76, an output shaft 7 is formed.
A support hole 78 is provided parallel to the axial direction of 0.

A support shaft 79 is inserted through the support hole 78 of the protrusion 76 of the gearbox 68, and the support shaft 79 is fixed to the gearbox 68 by a pin 80. It is rotatably mounted.

Fitting portions 82, 82 are formed inside the gearbox 68 of the PTO 67 and communicate with the insertion port 75.
Support shaft parts 84, 84 of the output shaft 70 are rotatably attached to the fitting parts 82, 82 of the gearbox 68 via a plurality of radial ball bearings 83, and An oil seal 85 is provided on the side of the radial ball bearing 83, and the output shaft 7 on the insertion port 75 side of the gearbox 68
An involute spline 86 is formed at the tip of the support shaft portion 84 of the output shaft 70, and a joint 25 is fixed to the involute spline 86 of the output shaft 70 as in the embodiment shown in FIG. A drive shaft 29 of a hydraulic pump 28 is connected.

A fitting support portion 87 and an external tooth portion 88 are formed between the support shaft portions 84 , 84 of the output shaft 70 , and the fitting support portion 87 of the output shaft 70 is provided with a plurality of needle roller bearings 89 . A drive gear 74 is rotatably attached, and external teeth 90 are integrally formed on the outer peripheral surface of the drive gear 74.

A sleeve 71 is provided on the external toothed portion 88 of the output shaft 70 so as to be slidable in the axial direction of the output shaft 70.
An annular groove 91 is formed on the outer peripheral surface of the sleeve 71, and internal teeth 92 that mesh with the external teeth 88 of the output shaft 70 are formed on the inner peripheral surface of the sleeve 71. By moving toward the drive gear 74, the inner teeth 92 of the sleeve 71 are moved toward the drive gear 74.
It is designed to mesh with the external teeth 90 of No. 4.

PTO installed in casing 1 of this transmission
The configuration of 67 is similar to the conventional one.

On the upper end surface of the gearbox 68 of the PTO 67,
As shown in FIG. 5, an upper opening 93 is formed in the upper part of the gearbox 68.
A lid body 94 that closes the gearbox 68 is fixed with a plurality of bolts 95, and an insertion opening 97 is formed on the other side of the gearbox 68 to open laterally and insert a moving shaft 96. Engagement support portions 98, 98 are formed in communication with the insertion port 97, a plurality of fitting grooves 99 are formed on the outer peripheral surface of the moving shaft 96, and a sleeve 71 is formed near the longitudinal center of the moving shaft 96. An engagement piece 100 that engages with the annular groove 91 of
The moving shaft 96 is attached to the engagement support portions 98, 98 of the gear box 68 so as to be slidable in the axial direction of the output shaft 70.

A fitting hole 102 is bored in the engagement support portion 98 on the side of the insertion port 97 of the gearbox 68 of the PTO 67.
A fitting groove 99 for the moving shaft 96 is provided inside the fitting hole 102.
A day tent ball 103 that fits into is stored,
A spring 104 is provided at the lower part of the detent ball 103 to constantly bias the detent ball 103 toward the fitting groove 99 of the moving shaft 96, so that the detent ball 103 fits into the fitting groove 99 of the moving shaft 96. This prevents movement of the moving shaft 96 relative to the gearbox 68.

As shown in FIG. 6, a support shaft 105 is fixed to the lid 94 provided on the upper part of the gear box 68, and a fitting support 106 of the switching lever 72 is rotatably supported on the support shaft 105. As shown in FIG. 7, an engagement pin 107 is fixed near the longitudinal center of the switching lever 72, and one end 108a of a connecting plate 108 is connected to the engaging pin 107 of the switching lever 72. The other end 108b is the engagement groove 5 formed at the tip of the spool 50 of the switching valve 49.
1, and the tip of a spool 50 of a switching valve 49 is connected to the other end 108b of the connecting plate 108 via an engagement pin 52, and the switching valve 49 is connected to a hydraulic cylinder (not shown) that tilts the loading platform of the dump truck. has been done.

One side edge 7 near the longitudinal center of the switching lever 72
A guide hole 109 made of a slightly bent elongated hole is provided between 2a and the other side edge 72b, and the upper end of a support pin 111 fixed to the tip of the interlocking lever 110 is fitted into the guide hole 109 of the switching lever 72. both ends 109a of the guide hole 109 of the switching lever 72,
A play path 117 is formed between 109b and the outer peripheral surface of the support pin 111 of the interlocking lever 110, and a continuous joint hole 112 is provided at the tip of the switching lever 72, and the continuous joint hole 112 of the switching lever 72 is not shown. It is connected to the control lever inside the driver's cab via cable etc.

The switching lever 72 and the interlocking lever 119 are arranged in a play path 11 so that the switching lever 72 does not move the interlocking lever 110 when switching the switching lever 72 from the lowered position to the neutral position and from the raised position to the neutral position.
Contacted via 7.

A bent portion 113 is formed on the side edge of the interlocking lever 110 by bending downward, and an engagement holder 114 is integrally fixed to the side surface of the bent portion 113 of the interlocking lever 110. is provided with a fitting hole 115, into which the tip 96a of the moving shaft 96 protruding from the insertion opening 97 of the gearbox 68 is inserted, and the tip 96a of the moving shaft 96 is fitted with a pin. 116 engages the holding body 114
is connected to.

Next, the operation of this embodiment will be explained.

When the subshaft 3 in the casing 65 of the transmission rotates, the driven gear 73 in the gear box 68 of the PTO 67 rotates with respect to the support shaft 79 while meshing with the counter gear 4 of the subshaft 3, and the drive gear 74 rotates as a driven gear. The fitting support portion 87 of the output shaft 70 while meshing with the output shaft 73
rotate around.

When the operating lever in the driver's cab is in the lowered position of the loading platform, the switching lever 72 provided outside the gear box 68 of the PTO 67 is in position D in FIG. The detent ball 103 of the insertion hole 102 of the gear box 68 is located at one end 109a of the guide hole 109 near the side edge 72b, and the engagement holder 1 is located on the outer peripheral surface of the moving shaft 96 as shown in FIG.
The inner teeth 92 of the sleeve 71 are fitted into the fitting grooves 99 on the side of the sleeve 71, and the moving shaft 96 is fixed to the gear box 68 by the detent ball 103. 74 external teeth 9
0, the rotation of the drive gear 74 is not transmitted to the output shaft 70 via the sleeve 71, the hydraulic pump 28 is stopped, and the loading platform of the dump truck is lowered by its own weight. .

Next, manually move the control lever in the driver's cab from the lowering position of the loading platform to the stop position, and the PTO 67
The switching lever 72 outside the gearbox 68 is the eighth
Move the switching lever 7 from the D position to the N position in the figure.
2 rotates in the clockwise direction in FIG. The support pin 111 passes through the play path 117 and is located at the other end 109b of the guide hole 109 near the one side edge 72a of the switching lever 72, so that the interlocking lever 110 does not move together with the switching lever 72, and the hydraulic pump 28 It remains stopped.

Next, after depressing the clutch pedal in the driver's cab with your foot to operate the clutch, move the operating lever in the driver's cab by hand from the stop position of the loading platform to the raised position, and the switching lever 72 outside the gearbox 68 of the PTO 67 will switch to the fourth position. The switching lever 72 moves from the N position to the U position in the figure, and the switching lever 72 is moved to the eighth position relative to the support shaft 105.
A connecting plate 108 that rotates clockwise in the figure and connects a spool 50 of a switching valve 49 to a switching lever 72.
When the support pin 11 moves to the most protruding state through
1, and the moving shaft 96 moves in the direction of protruding from the insertion opening 97 with respect to the engagement support portion 98 of the gearbox 68 via the engagement holder 114 of the interlocking lever 110. .

When the moving shaft 96 moves in the direction of protruding from the insertion opening 97 of the gearbox 68, the engagement piece 100 of the holder 101 of the moving shaft 96 moves the sleeve 71 toward the drive gear 74, and the moving shaft 96 moves toward the gearbox 68. 68 while pushing the detent ball 103 into the fitting hole 102 against the urging force of the spring 104, and at the same time as the detent ball 103 fits into the fitting groove 99 on the holding body 101 side of the moving shaft 96, The moving shaft 96 is fixed to the gear box 68 by a detent ball 103, and the inner teeth 92 of the sleeve 71 mesh with the outer teeth 90 of the drive gear 74, so that the rotation of the drive gear 74 is caused through the sleeve 71. The output shaft 70 rotates with respect to the gear box 68 via the radial ball bearing 83, and the output shaft 70 rotates the drive shaft 29 of the hydraulic pump 28 via the joint 25, causing the hydraulic pump 28 to rotate. is activated, and the hydraulic pump 28 operates the switching valve 49.
Raise the loading platform of the dump truck through the.

Furthermore, if you manually move the switching lever in the operator's cab from the raised position of the loading platform to the stopped position, the PTO67
The switching lever 72 outside the gearbox 68 is the eighth
Move the switching lever 7 from the U position to the N position in the figure.
2 rotates counterclockwise in FIG. 8 with respect to the support shaft 105, and the spool 50 of the switching valve 49 connects to the switching lever 72 and moves in the backward direction via the connecting plate 108. At the same time, the tip of the interlocking lever 110 The support pin 111 passes through the play path 117 and is located at one end 109a of the guide hole 109 of the switching lever 72, the interlocking lever 110 does not move together with the switching lever 72, and the hydraulic pump 28 remains in the operating state. .

Next, after depressing the clutch pedal in the driver's cab with your foot to operate the clutch, move the operating lever in the driver's cab by hand from the stop position of the loading platform to the lowering position. The switching lever 72 moves from the N position to the D position in the figure, and the switching lever 72 moves to the eighth position relative to the support shaft 105.
A connecting plate 10 that rotates counterclockwise in the figure and has a spool 50 of a switching valve 49 connected to a switching lever 72.
8 to the most retracted state, the interlocking lever 110 engages with the other end 109b of the guide hole 109 of the switching lever 72.
1, and the moving shaft 96 moves in the direction of retreating from the insertion opening 97 with respect to the engagement support portion 98 of the gearbox 68 via the engagement holder 114 of the interlocking lever 110. .

When the moving shaft 96 moves backward from the insertion hole 97 of the gearbox 68, the moving shaft 96 moves backward from the insertion hole 97 of the gearbox 68.
The engagement piece 100 of the holder 101 of No. 6 is attached to the sleeve 71.
The moving shaft 96 moves in the fitting hole 102 of the gear box 68 while pushing the detent ball 103 against the urging force of the spring 104, and the detent ball 103 moves. At the same time that the shaft 96 is fitted into the fitting groove 99 near the engagement holder 114, the moving shaft 96 is connected to the gear box 68 by the detent ball 103.
The internal teeth 92 of the sleeve 71 that are fixed to the external teeth 88 of the output shaft 70 are released from the external teeth 90 of the drive gear 74, and the rotation of the drive gear 74 causes the sleeve 71 to rotate. The pressure is not transmitted to the output shaft 70 via the hydraulic pump 28, and the hydraulic pump 28 is stopped, and the loading platform of the dump truck is lowered by its own weight.

In each of the above embodiments, the switching lever is provided with a guide hole, and the interlocking lever is provided with a support pin that engages with the guide hole of the switching lever. It is also possible to provide a support pin that engages the hole.

Effects of the Invention As described above, according to the automobile power take-off device of the present invention, the switching lever switches the valve to the three positions of down, neutral, and up, and the interlocking lever switches the valve between the gear mechanism and the output shaft. Even if the switching lever is used to switch the valve from the lowered position to the neutral position or from the raised position to the neutral position when the switching lever is connected or disconnected, the interlocking lever does not move because the switching lever is on the idle path. Between the lowered position and the neutral position of the valve, once the valve is set to the lowered position, the gear mechanism and the output shaft remain disconnected, so the switching lever is used to move the valve between the neutral position and the lowered position. By repeatedly moving , the loading platform can be lowered in small increments, and there is no need to depress the clutch pedal in the operator's cab to operate the clutch. Moreover, between the raised position and the neutral position of the valve, After this, the gear mechanism and output shaft remain connected, so by repeatedly moving the valve between the neutral position and the raised position using the switching lever, the loading platform can be raised in small increments. There is no need to depress the clutch pedal in the driver's cab to operate the clutch, there is no need for complicated link mechanisms or cables, and there is no need to incorporate a hydraulic pump or switching valve inside the gearbox, simplifying the structure. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of the main part of a power take-off device for an automobile according to an embodiment of the present invention, FIG. 2 is a cutaway right side view of the main part of FIG. 1, and FIG. Plan view,
FIG. 4 is a plan view of the main part showing the operation state of the switching lever shown in FIG. 3, FIG. , a cutaway left side view of the main part of FIG. 5, and FIG.
FIG. 8 is a plan view of the main part showing the operation state of the switching lever shown in FIG. 7. 1... Casing, 2... Window hole, 3... Subshaft,
4...Counter gear, 5...Power take-off,
6... Gearbox, 6a... Mounting part, 7... Gear mechanism, 8... Output shaft, 9... Sleeve, 10...
...Switching lever, 10a...One side edge, 10b...Other side edge, 11...Followed gear, 12...Drive gear, 1
3... Insertion port, 14... Projection, 15... Opening, 16... Support hole, 17... Support shaft, 18... Pin, 19... Needle roller bearing, 20... Fitting part, 2
1... Radial ball bearing, 22... Support shaft, 23...
... Oil seal, 24 ... Involute spline, 25 ... Joint, 28 ... Hydraulic pump, 29 ... Drive shaft, 30 ... Fitting support part, 31
... External teeth, 32 ... Needle roller bearing, 33 ... External teeth, 34 ... Annular groove, 35 ... Internal teeth, 36 ... Fitting section, 37 ... Fitting hole, 38 ... Day tent Ball, 39...Spring, 40...Through hole, 41
...Rotating shaft, 42... Fitting support, 43... Interlocking lever, 44... Fitting support, 45... Pin, 4
6... Operating piece, 47... Engaging body, 48... Engaging hole, 49... Switching valve, 50... Spool, 5
1... Engagement groove, 52... Engagement pin, 53... Guide hole, 53a... One end, 53b... Other end, 54
... Support pin, 55 ... Play path, 56 ... Continuous connection hole, 65 ... Casing, 66 ... Window hole, 67 ...
...Power take-off, 68...Gearbox, 6
8a...Mounting part, 69...Gear mechanism, 70...Output shaft, 71...Sleeve, 72...Switching lever,
72a...one side edge, 72b...other side edge, 73...
Driven gear, 74... Drive gear, 75... Insertion port,
76... Projection, 77... Opening, 78... Support hole, 79... Support shaft, 80... Pin, 81... Radial ball bearing, 82... Fitting part, 83... Radial ball bearing, 84... Support shaft portion, 85... Oil seal, 86... Involute spline, 87...
... Fitting support part, 88 ... External tooth section, 89 ... Needle roller bearing, 90 ... External tooth, 91 ... Annular groove, 92 ...
...Internal teeth, 93...Upper opening, 94...Lid body, 9
5... Bolt, 96... Moving shaft, 96a... Tip, 97... Insertion port, 98... Engagement support part, 99
... Fitting groove, 100 ... Engagement piece, 101 ... Holding body, 102 ... Fitting hole, 103 ... Detent ball, 104 ... Spring, 105 ... Support shaft,
106... Fitting support body, 107... Engaging pin, 1
08... Connection plate, 108a... One end, 108b...
...Other end, 109...Guiding hole, 109a...One end, 109b...Other end, 110...Interlocking lever, 111...Support pin, 112...Continuous connection hole, 1
13...Bending portion, 114...Engagement holding body, 115
... Fitting hole, 116 ... Pin, 117 ... Play path.

Claims (1)

[Scope of utility model registration request] In a power extraction device for an automobile in which a gear mechanism of a gearbox provided in a transmission and an output shaft are freely connected and disconnected, a loading platform up/down switching valve is installed outside the gearbox to control the lowering, neutral, and rising positions of the automobile loading platform.
A switching lever that can be freely switched between positions is provided, and an interlocking lever that connects and disconnects the gear mechanism and the output shaft is provided, and the switching lever and the interlocking lever are moved from a lowered position to a neutral position and then raised. The switching lever is provided on one side thereof so that the switching lever does not move the interlocking lever when switching from the neutral position to the neutral position, and moves the interlocking lever when switching the switching lever from the neutral position to the raised position and the lowered position. A power take-off device for an automobile, characterized in that a support pin is fitted into a guide hole provided on the other side via a play path.