JP5447989B2 - Elevating device for vehicle - Google Patents

Description

  According to the present invention, the mounting portion for mounting and supporting the wheelchair is moved up to a rising position set corresponding to the floor of the vehicle by extension of the hydraulic cylinder, and the mounting portion is moved to the ground by shortening the hydraulic cylinder. The present invention relates to a vehicular lifting apparatus that is moved downward to a correspondingly lowered position.

Such a vehicle lifting device moves the mounting portion to the raised position by extension of the hydraulic cylinder, and moves the mounting portion to the lowered position by shortening the hydraulic cylinder to move the wheelchair between the ground and the inside of the vehicle. It is comprised so that it can be made to transfer.
In such a vehicle lifting apparatus, conventionally, the hydraulic cylinder is configured as a double-acting single rod type in which the rod is provided only on one side with respect to the piston, and hydraulic oil is supplied to the first cylinder chamber of the hydraulic cylinder. By supplying and discharging the hydraulic oil from the second cylinder chamber, the hydraulic cylinder is shortened and the mounting portion is moved downward from the raised position to the lowered position. Conversely, the hydraulic oil is supplied to the second cylinder chamber of the hydraulic cylinder. By supplying and discharging the hydraulic oil from the first cylinder chamber, the hydraulic cylinder is extended to move the mounting portion up from the lowered position to the raised position (see, for example, Patent Document 1). .

JP 2005-287582 A

In order to efficiently transfer the wheelchair between the ground and the vehicle, the wheelchair is transferred between the ground side and the vehicle by increasing the moving speed of the mounting portion from the conventional normal speed. It is desired to shorten the time required for this.
Therefore, by using a hydraulic oil pump having a capacity higher than that of the hydraulic oil pump, the time required for moving the wheelchair between the ground and the vehicle by moving the mounting portion up and down at an increased speed is increased. Although shortening can be considered, the use of a high-capacity hydraulic oil pump increases the cost.

And if the mounting part on which the wheelchair is mounted and supported is moved up and down at an increased speed, the passenger sitting on the wheelchair may not be able to board safely.
In addition, when the mounting part that does not support the wheelchair is moved downward at an increased speed, when a passenger or a caregiver's foot on the ground side exists between the mounting part and the ground, There is a possibility that the feet of the occupant may be caught between the placing portion and the ground because the feet cannot be avoided from that time.
In this way, if the moving speed of the mounting portion is simply increased, there is a possibility that the wheelchair cannot be appropriately transferred between the ground and the vehicle.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle lifting apparatus that can appropriately transfer a wheelchair while reducing the transfer time of the wheelchair at a low cost. In the point.

In the vehicle lifting apparatus according to the present invention, the mounting portion for mounting and supporting the wheelchair is lifted and moved to the raised position set corresponding to the floor of the vehicle by extension of the hydraulic cylinder, and the mounting portion is the hydraulic pressure It is moved downward to a lowering position set corresponding to the ground by shortening the cylinder, and its first characteristic configuration is:
The hydraulic cylinder is shortened by providing hydraulic oil to a first cylinder chamber that is provided only on one side with respect to the piston and is located on the side where the rod exists, and the rod is A hydraulic oil supply / discharge mechanism configured to supply / discharge hydraulic oil to / from the hydraulic cylinder, which is configured as a double-acting single rod type that extends when hydraulic oil is supplied to the second cylinder chamber located on the non-existing side. Is a shortened state in which the hydraulic oil discharged from the hydraulic oil pump is supplied to the supply / discharge side first oil passage and the hydraulic oil is recovered from the supply / discharge side second oil passage, and the hydraulic oil discharged from the hydraulic oil pump Is supplied to the supply / discharge side second oil passage and can be switched to an extended state in which hydraulic fluid is recovered from the supply / discharge side first oil passage, the supply / discharge side first oil passage, and the first The cylinder side first oil passage connected to the cylinder chamber is connected to each other and the front Supply and discharge side and a second oil passage connected to the second cylinder chamber is a cylinder-side second oil passage and the normal for the state of being connected to each other, said supply and discharge-side second oil passage and the cylinder-side first oil passage And the cylinder side second oil passage are connected to each other, and the supply / discharge side first oil passage is any of the cylinder side first oil passage, the supply / discharge side second oil passage, and the cylinder side second oil passage. It is also configured with a increasing speed switching means for switching to a state for accelerating not connected, switching the supply and discharge means said switched to an extended state and the increased speed switching means to the state for the speed increasing In this state, the pressure of the hydraulic oil supplied to the second cylinder chamber is equal to or higher than the pressure necessary for moving up the mounting portion where the wheelchair is not mounted and supported. To move the mounting part up and down In that it is constituted by a pressure setting means for setting the below main pressure.

That is, when supplying and discharging means is switched and increasing speed switching means to reduce the state is switched to the normal for the state, the first oil passage hydraulic oil supply and discharge side discharged from the hydraulic oil pump and the cylinder-side first The hydraulic oil flowing through the oil passage and supplied to the first cylinder chamber and discharged from the second cylinder chamber flows through the cylinder-side second oil passage and the supply / discharge-side second oil passage and is collected by the supply / discharge means. Therefore, only the hydraulic oil from the hydraulic oil pump is supplied to the first cylinder chamber, so that the hydraulic cylinder is shortened at a normal speed, and the mounting portion is moved downward at the normal speed.
Further, when the supply and discharge means switched and increasing speed switching means in an extended state is switched to the normal for the state, the second oil passage hydraulic fluid discharged from the hydraulic fluid pump feed and discharge side and the cylinder-side second The hydraulic oil flows through the oil passage and is supplied to the second cylinder chamber, and the hydraulic oil discharged from the first cylinder chamber flows through the cylinder side first oil passage and the supply / discharge side first oil passage and is collected by the supply / discharge means. Therefore, only the hydraulic oil from the hydraulic oil pump is supplied to the second cylinder chamber, so that the hydraulic cylinder extends at a normal speed, and the mounting portion moves up at a normal speed.

Then, when the supply and discharge means switching means for and accelerating switched to the extended state is switched to the state for speed increasing, the supply and discharge-side second oil passage and the cylinder-side first oil passage and the cylinder-side second oil passage bets is because they are connected to each other, working oil discharged from the hydraulic fluid pump is supplied to the second cylinder chamber flows through the supply and discharge-side second oil passage and the cylinder-side second oil passage from the first cylinder chamber The discharged hydraulic oil flows through the cylinder side first oil passage and the cylinder side second oil passage and is supplied to the second cylinder chamber. In addition to the hydraulic oil from the hydraulic oil pump, the hydraulic oil from the first cylinder chamber is supplied to the second cylinder chamber.

  In this way, in addition to the hydraulic oil discharged from the hydraulic oil pump, the hydraulic oil from the first cylinder chamber is supplied to the second cylinder chamber, and the hydraulic cylinder is extended at a speed increased from the normal speed. Thus, the mounting portion can be moved up and down at an increased speed without using a hydraulic oil pump with a high discharge pressure, and an increase in cost due to the use of a hydraulic oil pump with a high discharge pressure can be avoided.

Further, in a state in which the supplying and discharging means extending switched and increasing speed switching means to the state is switched to a state for accelerating, select hydraulic oil pump discharge capacity relief valve suitable settings pressures and operating As a result, the pressure of the hydraulic oil supplied to the second cylinder chamber is equal to or higher than the pressure necessary for moving up the mounting portion on which the wheelchair is not mounted and supported, and the wheelchair is mounted and supported. The pressure is set to be less than the pressure required to move the mounting portion up.
Therefore, when the wheelchair is not placed and supported on the placement portion, the pressure necessary to move the placement portion up at the acceleration speed can be obtained, so the placement portion is moved up at the acceleration speed. If the wheelchair is not placed and supported on the placement section, the pressure required to move the placement section up at the increased speed cannot be obtained. Cannot move up. In this way, while allowing the ascending movement at the acceleration speed of the placing portion on which the wheelchair is not placed and supported, the ascending movement at the acceleration speed of the placing portion on which the wheelchair is placed and supported is prevented. ing.

Further, the supplying and discharging means switched and increasing speed switching means to reduce the state is switched to the state for speed increasing, the supply and discharge-side first oil passage, the second oil path supplying and discharging side, the cylinder-side first Since the hydraulic oil is not connected to the oil passage and the cylinder side second oil passage, the hydraulic oil from the hydraulic oil pump is not supplied to the second cylinder chamber, and the hydraulic cylinder is not shortened. Regardless of whether or not it is lowered, the lowering movement of the mounting portion at the increased speed is prevented.

  Therefore, since the movement of the mounting portion at the acceleration speed is only when the mounting portion moves up and when the mounting portion that does not support the wheelchair moves up, the wheelchair is placed and supported. When moving up and down the mounting section, and when moving down the mounting section on which the wheelchair is not supported, move the wheelchair up and down at normal speed to properly transfer the wheelchair. However, it is possible to shorten the transfer time of the wheelchair by moving it upward at a speed increase rate when the mounting portion that does not support the wheelchair moves upward.

  Accordingly, it has become possible to provide a vehicle lifting apparatus that can appropriately transfer a wheelchair while reducing the wheelchair transfer time at low cost.

  According to a second characteristic configuration of the vehicle lifting and lowering apparatus according to the present invention, in the first characteristic configuration, the pressure of the hydraulic oil supplied to the second cylinder chamber is the above-described mounting portion on which the wheelchair is mounted and supported. A relief valve is provided that operates when the pressure is higher than the pressure required for the upward movement.

  In other words, a hydraulic oil supply / discharge mechanism that supplies / discharges hydraulic oil to / from the hydraulic oil pump is usually provided with a relief valve to prevent the hydraulic pressure in the pipe from becoming abnormally high. As described above, it is possible to restrict the mounting portion on which the wheelchair is mounted and supported from moving up at an increased speed only by adjusting the set pressure of the relief valve that is normally provided.

  The third characteristic configuration of the vehicle lifting apparatus according to the present invention is the first or second characteristic configuration, in which the operator manually operates in a normal operation state in which a normal command is issued and a speed-up operation state in which a speed-up command is commanded. The manual operation tool that can be switched at the same time, and the switching means for speed increasing is switched to the normal state based on the normal command of the manual operating tool and the speed increasing command is based on the speed increasing command of the manual operating tool. Switching means for switching the speed switching means to the speed increasing state is provided.

That is, by the operator, such as a caregiver operates switch the manual operating member in the normal operation state, it is possible to placement portion switches the switching means for accelerating the normal for state vertically moving at normal speed. When the supply / discharge means is switched to the extended state, the operator switches the manual operation tool to the speed-up operation state, so that the wheelchair is placed and supported by the function of the hydraulic oil supply / discharge mechanism. However, it is possible to prevent the wheelchair on which the wheelchair is mounted and supported from being moved up and down at the increased speed.
Therefore, the wheelchair can be placed and supported even if the manual operation tool is mistakenly operated while the operator can select the normal speed and the acceleration speed as the speed for moving the placing portion where the wheelchair is not placed and supported. Therefore, it is possible to prevent the mounted portion from moving up and down at a speed increase rate, and to make the vehicle lifting device easier to use.

Perspective view of vehicle lifting device Plan view of the vehicle lifting device The perspective view which shows a hydraulic cylinder and a raising / lowering link mechanism The perspective view which shows a mounting part and a raising / lowering frame Side view showing movement of lifting device for vehicle Hydraulic circuit diagram showing the flow of hydraulic oil when the speed increasing switching means is switched to the normal state Hydraulic circuit diagram showing the flow of hydraulic oil when the speed increasing switching means is switched to the speed increasing state Hydraulic circuit diagram showing the flow of hydraulic oil when moving the mounting portion on which the wheelchair is not mounted at an increased speed Hydraulic circuit diagram showing the flow of hydraulic oil when the wheelchair is mounted and supported at a speed increasing speed Control block diagram Hydraulic circuit diagram in another embodiment (3) and another embodiment (4)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a vehicle lifting apparatus according to the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the vehicle lifting device L is mounted and used in the rear part of a vehicle V such as a wagon car provided with an opening / closing door D that opens and closes a rear opening O. Is.
The vehicle lifting device L includes a flat plate-like mounting portion 1 on which a wheelchair C is mounted, a lifting frame 2 that supports the mounting portion 1 so as to be slidably movable in and out of the vehicle, and a lifting frame 2 connected to a lower end portion. A pair of left and right arms 3, a pair of left and right lifting link mechanisms 4 (see FIG. 3) for connecting the arms 3 to the vehicle V side, and a left and right for moving the mounting portion 1 up and down by driving the pair of left and right lifting link mechanisms 4 A pair of hydraulic cylinders 5 (see FIG. 3) is provided, and is configured to be fixed on the floor surface F of the vehicle V via the base frame 7.

Next, the vehicle elevating device L will be described in detail. For convenience, the vehicle front-rear direction of the vehicle V may be referred to as the vehicle in-out direction, and the vehicle front side may be referred to as the vehicle inward side, and the vehicle rear side may be referred to as the vehicle outer side. In the state where the front (inward) is viewed from the rear (outward), the left and right directions are specified with one side in the lateral direction of the vehicle as the left side and the other side as the right side.
In addition, although the left and right members have the same configuration, the left and right members have substantially the same configuration. Therefore, only one of the left and right sides will be described, and members having different configurations on the left and right will be described each time.

As shown in FIG. 3, the base frame 7 is provided with base frame side brackets 8 projecting upward at the left and right ends thereof, and the base end portion of the upper link member 9 is interposed via the first pin 11a. The base frame side bracket 8 is pivotally connected, and the base end portion of the lower link member 10 is pivotally connected to the base frame side bracket 8 via the second pin 12a.
In addition, an arm side bracket 13 is provided at the upper end of each of the pair of left and right arms 3, and the tip end portion of the upper link member 9 is pivotally connected to the arm side bracket 13 via the third pin 11b. The tip of the lower link member 10 is pivotally connected to the arm side bracket 13 via the fourth pin 12b.
The upper link member 9, the lower link member 10, the base frame side bracket 8 and the arm side bracket 13 constitute a parallel quadruple link type lifting link mechanism 4, and the lifting link mechanism 4 is connected to the link cover 14. Covered.

As shown in FIG. 4, the elevating frame 2 is formed in a U-shape in which the side wall portion is erected at both end portions of the bottom wall portion in the vehicle lateral width direction and the upper side is opened in the vehicle front-rear direction view. The lower end portion of the arm 3 is connected to the upper end portion of the side wall portion. The placement unit 1 is formed in a rectangular shape in plan view.
And the rail part 16 which follows a vehicle inside / outside direction is provided in the both ends of the left-right horizontal width direction of the mounting part 1, and the several guide roller 17 provided in the raising / lowering frame 2 is provided in this rail part 16. As shown in FIG. It is mated. In addition, a rack (not shown) is provided along the front-rear direction at one end in the left-right direction of the placement unit 1, and a sliding electric motor 19 provided in the lifting frame 2 is provided in this rack. The pinion (see FIG. 10) is engaged.
That is, the mounting portion 1 is supported by the lifting frame 2 so as to be movable inward and outward of the vehicle in a form in which the rail portion 16 is guided and supported by the plurality of guide rollers 17, and the sliding electric motor 19 is forward and backward. 5 (c), the storage position that moves to the front side in the vehicle front-rear direction with respect to the lifting frame 2 and is located in the vehicle V, as shown in FIG. As shown in the drawing, it is configured to be slidable to a projecting position that moves rearward in the vehicle front-rear direction relative to the lifting frame 2 and projects outward of the vehicle V.

As shown in FIG. 4, at the end of the lift frame 2 on the inner side of the vehicle, the mounting portion 1 is switched to the standing posture as the mounting portion 1 slides from the storage position to the protruding position, and the mounting portion 1 protrudes. There is provided a front receiving body 21 that can be switched to a fall posture that falls to the front side of the vehicle as it slides from the position to the storage position.
Further, as shown in FIG. 1, at the end of the mounting portion 1 on the vehicle outer side, a switchable operation can be performed between an upright standing posture and a falling posture that has fallen from the standing posture to the vehicle rear side. A receiving body 22 is provided, and the rear receiving body 22 is configured to be switchable by a manual operation and an electric operation by driving a rear receiving body electric motor 23 (see FIG. 10).

  The mounting unit 1 includes a fixing device 24 that fixes the wheelchair C to the mounting unit 1, a seat belt device 25 that holds a passenger seated in the wheelchair C in the wheelchair C, and a passenger seated in the wheelchair C. A handrail 26 or the like is provided. The seat belt device 25 includes a belt winding portion 25b that winds and unwinds the belt 25a, and a connection portion 25c that connects the tip of the belt 25a. The belt winding portion 25b is supported by a handrail 26 erected at one end portion of the mounting portion 1 in the vehicle width direction, and the connection portion 25c is provided at the other end portion of the mounting portion 1 in the vehicle width direction. It has been.

  As shown in FIGS. 1 and 10, a pendant type operation tool 28 is provided as command means for commanding the ascending and descending movements of the mounting portion 1. An ascent switch 29, a descending switch 30 and an opening switch 27 to be pushed are provided. The raising switch 29 is commanded to ascend and move the mounting portion 1 as the raising switch 29 is pushed. A lowering command for moving the mounting portion 1 downward is commanded as the pressing operation is performed, and an opening command for changing the posture of the rear receiving body 22 from the standing posture to the falling posture is commanded as the opening switch 27 is pressed. Is configured to do.

Further, the operating tool 28 is provided with a speed increasing switch 31 that can be selectively switched between a normal operation posture and a speed increasing operation posture by the operator, and the speed increasing switch 31 is provided with the normal operation posture. A normal command to move the mounting unit 1 up and down at a normal speed is commanded as the switching operation is performed, and the mounting unit 1 is moved to the normal speed as the speed increasing switch 31 is switched to the speed increasing operation posture. It is configured to issue a speed increase command to move up at a higher speed.
That is, the speed increasing switch 31 has a normal operation posture (normal operation state) for instructing a normal command for moving the mounting unit 1 at a normal speed and a speed increasing command for moving the mounting unit 1 at a high speed. This corresponds to a manual operation tool that can be switched to the commanded speed-up operation posture (speed-up operation state) by manual operation of the operator.

Next, the hydraulic cylinder 5 will be described.
As shown in FIGS. 6 and 7, in the hydraulic cylinder 5, the rod 5b is provided only on one side with respect to the piston 5a, and hydraulic oil is supplied to the first cylinder chamber 34 located on the side where the rod 5b exists. It is shortened by being supplied, and is configured as a double acting single rod type that extends when hydraulic oil is supplied to the second cylinder chamber 35 located on the side where the rod 5b does not exist. Incidentally, in this embodiment, the diameter of the rod 5b is set to 20 mm, and the bore diameters of the first cylinder chamber 34 and the second cylinder chamber 35 are set to 40 mm.

As shown in FIG. 3, the tube 5c side of the hydraulic cylinder 5 is pivotally connected to the base frame side bracket 8 of the base frame 7 via the second pin 12a, and the rod 5b side of the hydraulic cylinder 5 connects the third pin 11b. And is pivotally connected to the arm side bracket 13 of the arm 3. As shown in FIG. 5 (a), the mounted hydraulic cylinder 5 is changed in posture to a posture in which the elevating link mechanism 4 falls to the outer side of the vehicle V as the hydraulic cylinder 5 is shortened. The mounting portion 1 is moved downward to the lowered position on the ground G, and as shown in FIGS. 5 (b) and 5 (c), the hydraulic cylinder 5 is extended so that the lifting / lowering link mechanism 4 is inward of the vehicle V. The mounting portion 1 is provided so as to be moved up to a rising position on the floor surface F.

Incidentally, the hydraulic cylinder 5 is provided between the upper link member 9 and the lower link member 10 and between the base frame side bracket 8 and the arm side bracket 13 in the vehicle lateral direction view, In plan view, the hydraulic cylinder 5 is provided so as to fit within the lateral width of the upper link member 9 and the lower link member 10.
The descending position on the ground G is a downward position set corresponding to the ground G, and the ascending position on the floor surface F is an ascending position set corresponding to the floor surface F.

Next, a hydraulic circuit 32 as a hydraulic oil supply / discharge mechanism that supplies / discharges hydraulic oil to / from the hydraulic cylinder 5 will be described.
As shown in FIGS. 6 and 7, the first discharge side of the hydraulic oil pump 33 and the first cylinder chamber 34 of the hydraulic cylinder 5 are communicated with each other through a first oil passage 36, and the second discharge side of the hydraulic oil pump 33. And the second cylinder chamber 35 of the hydraulic cylinder 5 communicate with each other through a second oil passage 37, and a pilot pressure operated check valve 38 is connected to each of the first oil passage 36 and the second oil passage 37. And a flow rate control valve 39 are provided.

  Further, the drain tank 40 and the first oil passage 36 and the second oil passage 37 are communicated with each other through a supply oil passage 42, and the backflow of hydraulic oil to the drain tank 40 side is provided in the supply oil passage 42. A check valve 41 for supply is provided. Further, the drain tank 40 is connected to the first oil passage 36 and the second oil passage 37 through a discharge oil passage 44, and the first oil passage 36 and the second oil passage are connected to the discharge oil passage 44. A discharge check valve 43 and a relief valve 45 are provided to prevent backflow of hydraulic oil to the 37 side.

The hydraulic oil pump 33 is composed of a bi-rotary pump that is rotationally driven in both forward and reverse directions by the pump electric motor 46 to change the discharge direction of the hydraulic oil.
Then, as shown in FIG. 6 (b), the hydraulic oil is supplied to the supply oil passage 42 and the first oil passage by driving the pump electric motor 46 to rotate forward and rotating the hydraulic oil pump 33 in the forward direction. The hydraulic oil is supplied to the first cylinder chamber 34 of the hydraulic cylinder 5 through the passage 36, and the hydraulic oil in the second cylinder chamber 35 is discharged, so that the hydraulic cylinder 5 is shortened.
The hydraulic oil discharged from the second cylinder chamber 35 flows through the second oil passage 37 and is sucked from the second discharge side of the hydraulic oil pump 33, and this hydraulic oil is discharged from the hydraulic oil pump 33. Further, excess hydraulic oil that is not sucked into the hydraulic oil pump 33 flows through the discharge oil passage 44 and is discharged to the drain tank 40.

Further, as shown in FIG. 6A, the hydraulic oil in the drain tank 40 is supplied to the supply oil passage 42 and the first oil pump 46 by driving the pump electric motor 46 in the reverse direction and rotating the hydraulic oil pump 33 in the reverse direction. The oil is supplied to the second cylinder chamber 35 of the hydraulic cylinder 5 through the two oil passages 37, and the hydraulic oil in the first cylinder chamber 34 is discharged so that the hydraulic cylinder 5 extends.
The hydraulic oil discharged from the first cylinder chamber 34 flows through the second oil passage 37 and is sucked from the first discharge side of the hydraulic oil pump 33 and is insufficiently sucked by the hydraulic oil pump 33. Flows through the discharge oil passage 44 and is sucked from the first discharge side of the hydraulic oil pump 33, and this hydraulic oil is discharged from the hydraulic oil pump 33.

Thus, the hydraulic oil discharged from the hydraulic oil pump 33 is changed to the first oil passage 36 (supply / discharge side first) by driving the pump electric motor 46 forward and reverse to change the discharge direction of the hydraulic oil pump 33. The hydraulic oil is supplied to the oil passage 36a), the hydraulic oil is supplied to the first cylinder chamber 34, and the hydraulic oil discharged from the second cylinder chamber 35 is drained from the second oil passage 37 (supply / discharge side second oil passage 37a). 40, supplying the hydraulic oil discharged from the hydraulic oil pump 33 to the second oil passage 37 (supply / discharge side second oil passage 37a) and supplying the hydraulic oil to the second cylinder chamber 35; The hydraulic oil discharged from the first cylinder chamber 34 can be switched to the extended state in which the hydraulic oil is collected from the first oil passage 36 (supply / discharge side first oil passage 36a) to the drain tank 40. That is, the pump electric motor 46, the hydraulic oil pump 33, the drain tank 40, and the like constitute the supply / discharge means 47.
Incidentally, the state where the pump electric motor 46 is driven in the forward direction is a state where the pump electric motor 46 is switched to the shortened state, and the state where the pump electric motor 46 is driven in the reverse direction is the state where the state is switched to the extended state.

The hydraulic circuit 32, a normal use state for flowing the hydraulic oil discharged from the first cylinder chamber 34 to the drain tank 40, the first cylinder chamber to the hydraulic oil supplied from the hydraulic fluid pump 33 to the second cylinder chamber 35 34 is provided with an increasing speed switching valve 49 as a speed-increasing change-over means capable of switching to the state for accelerated for combining the hydraulic fluid discharged from, then this speed increasing switch valve 49 described To do.

The speed increasing switching valve 49 is provided in the first oil path 36, and the speed increasing switching valve 49 and the second oil path 37 are communicated with each other by a bypass oil path 50. Hereinafter, the first oil passage 36 is connected to the first discharge side of the hydraulic oil pump 33 with respect to the oil passage portion on the hydraulic oil pump side of the first oil passage 36 where the speed increasing switching valve 49 is provided. The oil passage portion on the hydraulic cylinder side from the portion where the speed increasing switching valve 49 is provided in the first oil passage 36 is referred to as a passage 36 a and is referred to as a cylinder-side first oil passage 36 b connected to the first cylinder chamber 34. . In addition, a second oil passage 37 a connected to the second discharge side of the hydraulic oil pump 33 is connected to the second oil passage 37 a on the hydraulic oil pump side of the second oil passage 37 where the bypass oil passage 50 is connected. The oil passage portion on the hydraulic cylinder side of the second oil passage 37 where the bypass oil passage 50 is connected is referred to as a cylinder-side second oil passage 37 b connected to the second cylinder chamber 35.

The speed increasing switching valve 49 is connected to the supply / discharge side first oil passage 3 6 a, the cylinder side first oil passage 3 6 b and the bypass oil passage 50, and the supply / discharge side first oil passage 3 6. a cylinder-side first oil passage 3 6 b and connect with each other to and the first oil passage 3 6 and the bypass oil passage 50 and the normal change-over position for dividing each other (see FIG. 6), the cylinder-side first oil passage 3 6 b and the bypass oil passage 50 are connected to each other, and the speed increasing switching position for separating the supply / discharge side first oil passage 3 6 a, the cylinder side first oil passage 3 6 b and the bypass oil passage 50 from each other ( 7) and can be switched to two positions.
Incidentally, the speed increasing switching valve 49 is constituted by an electromagnetic valve that is urged toward the normal switching position and is switched to the speed increasing switching position by energizing the solenoid. The state in which the speed increasing switching valve 49 is switched to the normal change-over position is for normal state, a state where the speed increasing switching valve 49 is switched to the increasing speed switching position is the state for accelerated.

In a state in which the speed increasing switching valve 49 is switched to the normal switching position, the supply / discharge side first oil passage 36a includes the cylinder side first oil passage 36b, the supply / discharge side second oil passage 37a, and the cylinder side second oil. Of the passage 37b, only the cylinder side first oil passage 36b is connected, and the supply / discharge side second oil passage 37a includes the supply / discharge side first oil passage 36a, the cylinder side first oil passage 36b, and the cylinder side first oil passage 36a. It is connected only to the cylinder side second oil passage 37b of the two oil passages 37b, and this state corresponds to the normal state.
In a state where the speed increasing switching valve 49 is switched to the increasing speed switching position, the second oil passage 3 7 a supply and discharge side, the cylinder first oil passage 36b and the supply and discharge-side first oil passage side 3 6 only connected to the cylinder-side first oil passage 36b and the cylinder side second oil passage 37b of the a and the cylinder-side second oil passage 37b, and the first oil passage 3 6 a supply and discharge side, the sheet discharge side not connected to any of the second oil passage 3 7 a and the cylinder-side first oil passage 36b and the cylinder side second oil passage 37b, this state corresponds to a state for speed increasing.

  Then, as shown in FIG. 7A, when the hydraulic oil pump 33 is rotationally driven in the reverse direction to supply the hydraulic oil in the drain tank 40 to the second cylinder chamber 35 of the hydraulic cylinder 5, the speed increasing switching is performed. When the valve 49 is switched to the acceleration switching position, the hydraulic oil from the hydraulic oil pump 33 flows through the second oil passage 37 and is supplied to the second cylinder chamber 35 of the hydraulic cylinder 5. The hydraulic oil in one cylinder chamber 34 flows through the bypass oil passage 50 and joins the hydraulic oil flowing through the second oil passage 37 and is supplied to the second cylinder chamber 35. In this way, by rotating the hydraulic oil pump 33 in the reverse direction and switching the acceleration switching valve 49 to the acceleration switching position, the first cylinder chamber 34 is added to the hydraulic oil from the hydraulic oil pump 33. Since the hydraulic oil discharged from the second cylinder chamber 35 can be supplied to the second cylinder chamber 35, the amount of hydraulic oil supplied to the second cylinder chamber 35 per unit time increases, so the extension speed of the hydraulic cylinder 5 increases. It has come to be.

Further, as shown in FIG. 7B, when the hydraulic oil pump 33 is rotationally driven in the forward direction to supply the hydraulic oil in the drain tank 40 to the first cylinder chamber 34 of the hydraulic cylinder 5, the speed increasing switching is performed. When the valve 49 is operated switched to switching position accelerated, since the supply and discharge-side first oil passage 3 6 a and the cylinder-side second oil passage 37b and the second oil passage 3 7 is partitioned, operation The hydraulic oil from the oil pump 33 is not supplied to the hydraulic cylinder 5, and the hydraulic cylinder 5 is not shortened. Therefore, the shortening speed of the hydraulic cylinder 5 is not increased.

Thus, when the hydraulic oil pump 33 is rotated in the reverse direction to supply the hydraulic oil in the drain tank 40 to the second cylinder chamber 35 of the hydraulic cylinder 5, the speed increasing switching valve 49 is set to the normal switching position. by switching operation, by the hydraulic oil discharged from the first cylinder chamber 34 is switched to the normal for the state circulating in the drain tank 40, to operate switching speed increasing switching valve 49 to increase speed switching position, It is configured to be switched hydraulic oil discharged from the first cylinder chamber 34 to the increasing speed state circulating in the second cylinder chamber 35.

  The hydraulic oil pump 33, the check valve 38, the flow rate control valve 39 and the like are integrally assembled into a unit in the power unit U, and the speed is increased in the oil path portion located outside the power unit U in the first oil path 36. A switching valve 49 is provided, and a bypass oil passage 50 is connected to an oil passage portion located outside the power unit U in the second oil passage 37.

  As shown in FIG. 10, the control device H as the control means includes detection information from the lift position detection means 51 that detects the height of the placement portion 1 with respect to the vehicle V, and the slide position of the placement portion 1 with respect to the lift frame 2. The detection information from the slide position detecting means 52 for detecting the command and the command information from the operation tool 28 are inputted, and based on these information, the pump electric motor 46, the slide electric motor 19 and the rear receiving body electric motor. The operation of 23 is controlled.

Further, the control device H is configured to control the operation of the speed increasing switching valve 49 based on command information from the speed increasing switch 31 of the operating tool 28. In other words, the control device H switches the speed increasing switching valve 49 to the normal switching position based on the normal command of the speed increasing switch 31, and increases the speed based on the speed increasing command of the speed increasing switch 31. In order to switch the switching valve 49 to the switching position for acceleration, switching control of energization to the solenoid of the switching valve 49 for acceleration is performed.
Therefore, the control device H switches the speed increasing switching valve 49 to the normal switching position based on the normal command of the speed increasing switch 31, and increases the speed increasing switching valve 49 based on the speed increasing command of the speed increasing switch 31. This corresponds to switching means for switching to the speed switching position.

Next, movement control of the placement unit 1 by the control device H will be described.
The placement unit 1 is normally moved up to the raised position and slid to the protruding position, and is stored in the vehicle V. When the raising switch 29 is pushed in such a state, the slide electric motor 19 is driven to rotate in the forward direction to slide the placement unit 1 from the storage position toward the protruding position, and slide position detecting means Based on the detection information 52, the slide electric motor 19 is stopped, and the mounting portion 1 is stopped at the protruding position. Thereafter, the pump electric motor 46 is rotationally driven in the forward direction to shorten the hydraulic cylinder 5, thereby moving the mounting portion 1 downward from the raised position to the lowered position, and based on the detection information of the raised / lowered position detecting means 51. Then, the pump electric motor 46 is stopped, and the mounting portion 1 is stopped at the lowered position.

  In this way, when the lowering switch 30 is pushed while the mounting portion 1 is in the lowering position, the electric motor 46 for pump is rotated in the reverse direction to extend the hydraulic cylinder 5. The mounting portion 1 is moved upward from the lowered position toward the raised position, and the pump electric motor 46 is stopped based on the detection information of the raised / lowered position detecting means 51 to stop the placing portion 1 at the raised position. Thereafter, the slide electric motor 19 is rotationally driven in the reverse direction to slide the mounting portion 1 from the protruding position toward the storage position, and the slide electric motor 19 is moved based on the detection information of the slide position detecting means 52. The mounting unit 1 is stopped at the storage position by stopping.

Then, when the speed increasing switch 31 is operated to the normal operation position when the mounting portion 1 moves downward from the raised position to the lowered position, the hydraulic oil from the hydraulic oil pump 33 is moved to the first of the hydraulic cylinder 5. The hydraulic oil supplied to the cylinder chamber 34 and discharged from the second cylinder chamber 35 is discharged to the drain tank 40. Thus, since only the hydraulic oil from the hydraulic oil pump 33 is supplied to the first cylinder chamber 34 of the hydraulic cylinder 5, the hydraulic cylinder 5 is shortened at a normal speed. Move down.
Further, when the speed increasing switch 31 is operated to the normal operation position when the mounting portion 1 moves upward from the lowered position to the raised position, the hydraulic oil from the hydraulic oil pump 33 is moved to the second of the hydraulic cylinder 5. The hydraulic oil supplied to the cylinder chamber 35 and discharged from the first cylinder chamber 34 is discharged to the drain tank 40. Thus, since only the hydraulic oil from the hydraulic oil pump 33 is supplied to the second cylinder chamber 35 of the hydraulic cylinder 5, the hydraulic cylinder 5 extends at a normal speed. Move up.

Further, when the speed increasing switch 31 is operated to the speed increasing operation position when the mounting portion 1 moves downward from the raised position to the lowered position, the hydraulic oil from the hydraulic oil pump 33 is discharged to the drain tank 40. Is done. As described above, since the hydraulic oil from the hydraulic oil pump 33 is not supplied to the hydraulic cylinder 5, the hydraulic cylinder 5 does not expand and contract, and thus the placement unit 1 does not move downward from the raised position.
When the placing switch 1 moves upward from the lowered position to the raised position, if the speed increasing switch 31 is operated to the speed increasing operation position, the hydraulic oil from the hydraulic oil pump 33 is moved to the first position of the hydraulic cylinder 5. The hydraulic oil in the first cylinder chamber 34 is also supplied to the second cylinder chamber 35 while being supplied to the two cylinder chamber 35. As described above, the hydraulic oil in the first cylinder chamber 34 of the hydraulic cylinder 5 is supplied to the second cylinder chamber 35 in addition to the hydraulic oil from the hydraulic oil pump 33, so that the hydraulic cylinder 5 is accelerated at a speed higher than the normal speed. In order to extend at the set speed, the placement unit 1 moves upward at an increased speed.

  In the relief valve 45 provided in the hydraulic circuit 32, the wheelchair C is placed and supported in a state where the supply / discharge means 47 is switched to the expanded / contracted state and the speed increasing switch 31 is switched to the speed increasing switching position. It is provided as a pressure setting means for restricting the upward movement of the mounting portion 1. Next, the relief valve 45 will be described.

  The pressure of the hydraulic oil supplied to the first cylinder chamber 34 or the pressure of the hydraulic oil supplied to the second cylinder chamber 35 exceeds the set pressure, and the discharge oil passage 44 provided with the relief valve 45 is operated. When the oil pressure becomes equal to or higher than the set pressure, the relief valve 45 is actuated and opened by the pilot pressure, and flow to the drain tank side in the discharge oil passage 44 is allowed.

  The set pressure of the relief valve 45 is such that the wheelchair C is not placed and supported in a state where the supply / discharge means 47 is switched to the extended state and the speed increasing switching valve 49 is switched to the speed increasing switching position. The pressure is set to be equal to or higher than the pressure necessary for the ascending movement of the placing unit 1 and equal to or less than the pressure necessary for the ascending movement of the placing unit 1 on which the wheelchair C is placed and supported.

  For example, the maximum pressure required to move the mounting portion 1 on which the wheelchair C is not mounted and supported from the descending position to the ascending position at an increasing speed is 12.3 Mpa. In the case where the pressure required to move the mounting portion 1 supported by the mounting ascending from the descending position to the ascending position at a speed increase rate is 13.9 Mpa, it is less than 12.3 Mpa and 13.9 Mpa. The set pressure of the relief valve 45 is set to a pressure exceeding, specifically 13 MPa.

  By setting the set pressure of the relief valve 45 in this manner, the relief valve 45 does not operate when the placement portion 1 on which the wheelchair C is not placed and supported is moved upward at an increased speed. Can be moved up from the lowered position to the raised position at a speed increasing speed, and when the wheelchair C is moved up and moved, the relief valve 45 is activated. It does not move upward from the lowered position to the raised position.

  By the way, the highest pressure required to move the mounting part 1 on which the wheelchair C is placed and supported at a normal speed is ascending and moving at a speed increasing speed on the placing part 1 on which the wheelchair C is not supported. The mounting portion 1 can be moved up and down regardless of whether or not the wheelchair C is mounted and supported at a normal speed.

  By providing the speed increasing switching valve 49 and setting the set pressure of the relief valve 45 in this manner, the mounting portion 1 that does not support the wheelchair C is moved upward without using the high-capacity hydraulic oil pump 33. Since the wheelchair C can be moved up at an increased speed only when the wheelchair C is moved, the transfer time of the wheelchair C can be shortened while the wheelchair C can be transferred appropriately.

[Another embodiment]
(1) In the above embodiment, the set pressure is set so that the relief valve 45 is activated when the pressure is higher than the pressure required to move the mounting portion 1 on which the wheelchair C is mounted and supported at an increased speed. And the relief valve 45 is provided as the pressure setting means so as to restrict the ascending movement at the acceleration speed of the placement portion 1 on which the wheelchair C is placed and supported. More than the pressure required to move the mounting part 1 on which the wheelchair C is not supported and supported at a speed increase speed, the mounting part 1 on which the wheelchair C is supported and supported is moved up and moved at a speed. The pressure setting means is configured to restrict the ascending movement at the acceleration speed of the placing portion 1 on which the wheelchair C is placed and supported by using the one having the highest discharge pressure less than the pressure necessary for the operation. A hydraulic oil pump 33 may be provided.

(2) In the above-described embodiment, the manual operation tool for instructing the normal command and the acceleration command, the up / down command operation tool (the up switch 29 and the down switch 30) for instructing the up command and the down command, and the opening command are commanded. Although provided separately from the opening command operation tool (open switch 27), the lifting command operation tool or the opening command operation tool may be used as a manual operation tool. Specifically, a speed increase command may be issued by simultaneously pressing the up switch 29 and the opening switch 27, and it is increased by pressing the up switch 29 twice in a short time. You may comprise so that a speed command may be commanded.

(3) In the above embodiment, the hydraulic oil pump 33 is provided with a double-rotating pump, and the hydraulic oil pump 33 is rotated in the forward direction to switch the supply / discharge means 47 to a shortened state. The supply / exhaust means 47 is switched to the extended state by being driven to rotate in the reverse direction. However, as shown in FIG. 11, the hydraulic oil pump 33 is provided with a unidirectional rotary pump and discharged from the hydraulic oil pump 33. It is possible to switch between a shortening switching position for supplying the hydraulic oil to the supply / discharge side first oil passage 36a and an extension switching position for supplying the hydraulic oil discharged from the hydraulic oil pump 33 to the supply / discharge side second oil passage 37a. A switching valve 53 for expansion / contraction, switching the expansion / contraction switching valve 53 to the shortening position to switch the supply / discharge means 47 to the shortened state, and switching the expansion / contraction switching valve 53 to the expansion position to supply / discharge means It may be configured to switch 7 in the extended state.

(4) In the above embodiment, the speed increasing switching valve 49 is connected to the supply / discharge side first oil passage 36a, the cylinder side first oil passage 36b, and the bypass oil passage 50, and the bypass oil passage 50 is connected to the second oil passage. Although connected to the passage 37, the speed increasing switching valve 49 is connected to the supply / discharge side second oil passage 37a, the cylinder side second oil passage 37b and the bypass oil passage 50, and the bypass oil passage 50 is connected to the first oil passage. 36, and as shown in FIG. 11, the acceleration switching valve 49 is connected to the supply / discharge side first oil passage 36a, the cylinder side first oil passage 36b, and the supply / discharge side second oil passage 37a. The cylinder-side second oil passage 37b may be connected so that the bypass oil passage 50 is not provided.

(5) In the above embodiment, a wagon car is shown as an example of the vehicle V, and an example in which a vehicle elevating device is mounted on the rear part of the wagon car is shown. It can be applied to various vehicles such as buses, trucks, and the like, and the mounting location is not limited to the rear portion of the vehicle V, but is mounted on an intermediate portion in the front-rear direction of the vehicle V to place the mounting portion 1. It can also be configured to move up and down while moving in the vehicle width direction.

DESCRIPTION OF SYMBOLS 1 Mounting part 5 Hydraulic cylinder 5a Piston 5b Rod 31 Manual operating tool 32 Hydraulic oil supply / discharge mechanism 33 Hydraulic oil pump (pressure setting means)
34 First cylinder chamber 35 Second cylinder chamber 36a Supply / discharge side first oil passage 36b Cylinder side first oil passage 37a Supply / discharge side second oil passage 37b Cylinder side second oil passage 45 Relief valve (pressure setting means)
47 Feeding / discharging means C Wheelchair F Floor surface H Switching means V Vehicle

Claims (3)

The mounting portion for mounting and supporting the wheelchair is moved up to a rising position set corresponding to the floor of the vehicle by extension of the hydraulic cylinder, and the mounting portion is set corresponding to the ground by shortening the hydraulic cylinder A vehicle elevating device that is moved down to the lowered position,
The hydraulic cylinder is shortened by providing hydraulic oil to a first cylinder chamber that is provided only on one side with respect to the piston and is located on the side where the rod exists, and the rod is It is configured as a double acting single rod type that extends by supplying hydraulic oil to the second cylinder chamber located on the non-existing side,
A hydraulic oil supply / discharge mechanism that supplies / discharges hydraulic oil to / from the hydraulic cylinder,
A shortened state in which the hydraulic oil discharged from the hydraulic oil pump is supplied to the supply / discharge side first oil passage and the hydraulic oil is recovered from the supply / discharge side second oil passage, and the hydraulic oil discharged from the hydraulic oil pump is supplied. Supply / discharge means that can be switched to an extended state of supplying hydraulic oil from the supply / discharge side first oil passage and collecting the hydraulic oil from the supply / discharge side first oil passage;
The cylinder side where the supply / discharge side first oil passage and the cylinder side first oil passage connected to the first cylinder chamber are connected to each other and to the supply / discharge side second oil passage and the second cylinder chamber A normal state in which the second oil passage is connected to each other; the supply / discharge side second oil passage, the cylinder side first oil passage, and the cylinder side second oil passage are connected to each other; first oil passage first oil passage said cylinder side and the supply and discharge-side second oil passage and the cylinder-side second oil passage either to be switched to a state for accelerating not connected also an increasing speed switching means Configured with
In a state in which the supply and discharge means said switched to an extended state and the increased speed switching means is switched to the state for the speed increasing, the pressure of the hydraulic fluid supplied to said second cylinder chamber, said wheelchair The pressure is set to be equal to or higher than the pressure necessary for moving up the mounting unit that is not placed and supported, and less than the pressure necessary for moving up the mounting unit on which the wheelchair is placed and supported. A vehicle elevating device comprising pressure setting means. As the pressure setting means, in a state in which the supply and discharge means said switched to an extended state and the increased speed switching means is switched to the state for the speed increasing, the hydraulic oil supplied to the second cylinder chamber The vehicle lifting / lowering device according to claim 1, wherein a relief valve is provided that operates when the pressure becomes equal to or higher than a pressure required to move the mounting portion on which the wheelchair is mounted and supported. A manual operation tool that can be switched by a manual operation of an operator between a normal operation state for instructing a normal command and a speed increase operation state for instructing a speed increase command;
Based on the normal command of the manual operating tool, the speed increasing switching means is switched to the normal state, and based on the speed increasing command of the manual operating tool, the speed increasing switching means is switched to the speed increasing state. The vehicle elevating device according to claim 1 or 2, further comprising a switching means.

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