JPH0224708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a self-propelled lift truck which is provided with a fork-shaped loading platform on which a pallet loaded with cargo is mounted, has front and rear wheels that support the loading platform, and drives the rear wheels by an electric motor. Regarding this, a brake shoe is engaged and pivotally supported on a high-speed side transmission shaft that drives a running rear wheel, and a movable-side disk is provided to face the brake shoe, and the movable-side disk is oriented in the axial direction of the high-speed side transmission shaft. a brake that is slidably supported on a plurality of bolts fixing the outer periphery of the movable side disk to the gear case of the high-speed side transmission shaft so as to move the disk, and is opposed to the movable side disk on the opposite side from the brake shoe; a receiving plate, a center portion of the brake receiving plate is slidably supported on a shaft portion integrally formed with the movable side disk, and an outer peripheral portion of the brake receiving plate is slidably supported on the bolt; A nut that restricts the movement of the brake receiving plate in the direction away from the movable disc is screwed onto the bolt, a compression spring is interposed between the movable disc and the brake receiving plate, and the brake receiving plate is supported in pressure contact with a nut, while the movable side disk is supported in pressure contact with a brake shoe, and further includes a brake plate that faces a brake receiving plate on the opposite side of the movable side disk, and the brake plate is connected to the movable side disk. A brake that is slidably supported on the shaft and that restricts movement of the brake plate in a direction away from the brake receiving plate is fitted and fixed to the shaft of the movable side disk, and that faces the brake plate. A plurality of pressure balls are protruded and fixed on the same circumference on the side surface of the brake plate, while a plurality of cams move the pressure balls in and out on the same circumference on the side surface of the brake plate facing the brake plate. A hole is formed, and the movable side disk is moved toward and away from the brake shoe by rotating the brake plate, and the brake plate and the brake plate are supported by the movable side disk. The mounting structure can be simply constructed, and the movable side disk can be easily connected to the brake plate by fixing the brake receiving plate with the release spring and the brake spring, and an appropriate braking function can be obtained and the size can be reduced. The purpose of the present invention is to provide a self-propelled lift truck that can be used in a variety of situations.

Embodiments of the present invention will be described in detail below based on the drawings. Fig. 1 is a side view of the whole, and Fig. 2 is a rear view of the same. In the figure, 1 is a fork-shaped cargo platform, and 2 is a traveling device provided at the tip of the cargo platform 1 via a pivot arm 3 so as to be able to protrude downward. A front wheel 4 is a jacking device that supports the base end of the loading platform 1 and raises and lowers it. Then, an elevating cylinder 6 for bringing the piston rod 5 into contact with the lower surface of the base end support portion 1a of the loading platform 1, an oil tank 7 provided on the outer periphery of the cylinder 6, and a plunger pump 8 for driving the cylinder 6 are installed. The oil passage base 9 and the oil tank 7 are hydraulically connected to each other.
The jacking device 4 is constituted by a pumping handle 11 which is supported so as to be able to rise and fall freely and is connected to the plunger pump 8 via a pressure roller 10.

Further, a bearing plate 12 is provided below the oil passage base 9 so as to be horizontally rotatable, and the other end of a lifting arm 13 whose one end is connected to the pivot arm 3 is connected to the bearing plate 12, thereby raising and lowering the loading platform 1 approximately vertically. At the same time, an axle frame 14 that is horizontally rotated integrally with the oil passage base 9 is provided below the bearing plate 12, and a rear running wheel 15 is mounted on the axle frame 14.
Attach to. Furthermore, the rear cover 16 is fixed to the bearing plate 12, and the outrigger wheels 17,
17 are attached to both sides of the cover 16, and a battery 18 serving as a running power source is installed inside the support portion 1a of the loading platform 1.

As shown in FIG. 3, the axle frame 14 is fixed to the lower end of the lifting cylinder 6 which is erected and supported via the bearing plate 12, and by rotating the pumping handle 11 in the laid down position left and right, the axis of the cylinder 6 is rotated. The axle frame 14 is horizontally rotated, an axle 19 is integrally formed on one side of the axle frame 14, and a mounting plate 2 is attached to the protruding end of the axle 19.
0 is fixed, and the traveling motor 21 is fixed to the plate 20 via the bolt 20a, and the rear traveling wheel 15 is fixed.
A bearing member 23 to which a wheel drum 22 is removably fixed is pivotally supported in the middle of the axle 19. Further, the high-speed side and low-speed side transmission shafts 24 and 25 are each supported by the axle frame 14, and the high-speed side transmission shaft 2
The output shaft 27 of the motor 21 is directly connected to one end of the motor 21 via an eccentric universal joint 26, and the respective transmission shafts 24, 25 are connected via reduction gears 28, 29.
a reduction output gear 31 which is interlocked and connected and meshed with an internal gear 30 provided on the bearing member 23;
is provided at one end of the low speed transmission shaft 25. A gap between the axle frame 14 and the internal gear 30 is closed by an oil seal 32.

Further, a gear case 33 in which the gears 28 and 29 are installed is fixed to the axle frame 14, and a high-speed transmission shaft 24 is made to protrude outside the gear case 33.
A brake shoe 37 is provided with a travel brake 34 attached to the end thereof, and is engaged and supported on the high-speed transmission shaft 24 via a key 35 and a spring ring 36.
, fixed-side and movable-side disks 38 and 39 sandwiching the brake shoe 37, a brake receiving plate 40 supported on the shaft portion 39a of the movable-side disk 39 in a freely axially movable manner, and a brake receiving plate using the disk 39. The travel brake 34 is constituted by a brake plate 42 rotatably supported by the shaft portion 39a via a spring ring 41 so as to sandwich the plate 40 therebetween. As shown in FIG. 4, a nut 44 is attached to the bolt 43 fixed to the gear case 33.
The fixed side disk 38 is fixedly installed through the bolt 43, and the movable side disk 39 is supported through the spacer 45 fitted into the bolt 43, and the brake receiving plate 4 is connected to the bolt 43 through the brake adjustment nut 46.
0 and the fixed side disk 38
A release spring 47 is provided between the movable side disc 39 and the brake receiving plate 40 to separate them, and a release spring 47 is provided between the movable side disc 39 and the brake receiving plate 40 to separate the discs 39 from the brake shoe 37. Brake springs 48 that are brought into pressure contact are interposed respectively. Further, as shown in FIGS. 5 to 7, a pressure ball 49 is held on the brake receiving plate 40, and a semicircular egg-shaped cam hole 50 is formed inside the brake plate 42 to allow the ball 49 to move in and out. , a plurality of cam holes 50 for engaging and disengaging the pressure ball 49 are arranged on the same circumference and in the same rotational direction, and a brake wire 52 is stretched through an outer receiver 51 attached to the gear case 33 through an adjustment screw 53. The cam hole 50 is connected to the eccentric position of the brake plate 42, and is connected to a return spring 54 that projects from the wire 52.
is opened, and the brake plate 40 is released by the release spring 47.
At the same time, the brake plate 42 is held in contact with the brake receiving plate 40 via the pressure ball 49 by the braking spring 48, and the pressure ball 49 is moved to the deepest position of the cam hole 50 as shown in FIG. By engaging the force of the brake spring 48, the brake plate 42 approaches the brake receiving plate 40, and the movable disc 39 is pressed against the brake shoe 37, while pressing the pressure ball 49 as shown in FIG. By letting it escape from the cam hole 50, the brake plate 4 resists the brake spring 48.
2 is moved away from the brake receiving plate 40, and the movable side disk 39 is moved away from the brake shoe 37, respectively.

Next, as shown in FIGS. 8 and 9, grip portions 55, 55 are attached to both sides of the upper end of the pumping handle 11.
In addition, a hydraulic switching lever 56 and a brake lever 5 are installed on the left and right sides of the upper end of the handle 11.
Attach 7 respectively. The base end of the brake lever 57 is supported by a bracket 58 inside the handle 11 via a pin 59, and the other end of the brake wire 61 stretched through an outer receiver 60 is connected to the brake lever 57. When the intermediate portion is inserted into the lever guide hole 62 and the lever 57 is engaged with the parking brake notch 63 of the lever guide hole 62, the pressure ball 49 is inserted into the cam hole 50 by operating the brake wire 61 and the brake plate 42. It is constructed so that the rear wheel 15 is maintained in a braking state by being fitted.

Further, on the upper end surface of the handle 11, forward/reverse switches 64, 65 and a horn switch 66 are arranged substantially in a straight line in the front and rear of the aircraft, and the switches 64, 65 protrude from the lower surface in an on state and are retracted in an off state. Operation pieces 67 and 68 are integrally connected to switch push buttons 69 and 70. A travel regulating plate 72 is attached below the switches 64 and 65 via a support shaft 71 so as to be movable up and down, and when the brake lever 57 is moved upward and engaged with the brake notch 63, The regulation plate 72
Push up and press buttons 69 and 70 of switches 64 and 65.
When the push buttons 69 and 70 are pressed, the operating pieces 67 and 68 are brought into contact with the upper surface of the regulating plate 72, thereby preventing the push buttons 69 and 70 from being turned on.

The present invention is constructed as described above, and by operating the pumping handle 11 and the hydraulic switching lever 56, the loading/unloading work of cargo is carried out by raising and lowering the loading platform 1 in the same manner as in the past, and the forward/reverse switch 6 is operated.
By operating the push buttons 69 and 70 of 4 and 65, the travel motor 21 is moved forward and backward to move it to a desired location.By lifting the brake lever 57 and engaging the brake notch 63, the brake wire 61 is moved. The brake plate 42 is rotated through the brake plate 42, the cam hole 50 is fitted into the pressure ball 49, the movable disc 39 is pressed against the brake shoe 37 by the brake spring 48, and the rear wheel 15 is braked and supported in a parked state. . At this time, the travel regulation plate 72 is moved upward by the brake lever 57, and the push buttons 69, 70 are pressed.
This prevents the forward/forward switch 6 from being pushed.
4 and 65 operations are interrupted to prevent accidents such as seizure damage to the travel motor 21. Further, by the downward movement of the brake lever 57, the brake plate 42
is rotated back by the return spring 54, the pressure ball 49 escapes from the cam hole 50, the movable disc 39 moves away from the brake shoe 37 against the brake spring 48, and the brake on the rear wheel 15 is released. Since the brake receiving plate 40 is locked and fixed to the bolt 43 via the nut 46 and the release spring 47, when the pressure ball 49 escapes, the brake plate 42, which is integrally connected by the spring 41, and the movable side The disc 39 is moved axially against the brake spring 48 to separate the disc 39 from the brake shoe 37.

Furthermore, the movable side disk 39 and the brake receiving plate 40
change the gap by screwing the nut 46,
It adjusts the brakes.

In the above embodiment, the brake plate 42 was rotated to perform the braking action by pulling the brake wire 52, but the cam hole 5 was rotated in the opposite direction of rotation.
By simply opening 0, the brake can be easily released by pulling the brake wire 52, and the operation direction can be easily reversed with substantially the same function as the travel brake 34. be.

As is clear from the embodiments described above, the present invention has a brake shoe 37 that is engaged and pivotally supported on the high-speed transmission shaft 24 that drives the rear running wheels 15, and a movable disk 39 that is opposed to the brake shoe 37. Prepare,
The movable side disk 39 is moved so as to move the movable side disk 39 in the axial direction of the high speed side transmission shaft 24.
The outer peripheral part of the gear case 3 of the high-speed side transmission shaft 24
A brake receiving plate 40 is slidably supported on a plurality of bolts 43 fixed to the brake shoe 37 and is opposed to the movable disc 39 on the opposite side to the brake shoe 37, with the center portion of the brake receiving plate 40 being It is slidably supported on a shaft portion 39a integrally formed with the movable side disk 39, and the outer peripheral portion of the brake receiving plate 40 is slidably supported on the bolt 43, and in a direction away from the movable side disk 39. A nut 46 that restricts the movement of the brake receiving plate 40 is screwed onto the bolt 43, a compression spring 48 is interposed between the movable disc 39 and the brake receiving plate 40, and the brake receiving plate 40 is tightened with the nut. 46, while the movable side disk 39 is supported by the brake shoe 3.
7, and further the movable side disk 39
A brake plate 42 is provided opposite to the brake receiving plate 40 on the opposite side, and the brake plate 42 is slidably supported on the shaft portion 39a of the movable disk 39, and the brake plate 42 is supported in a direction away from the brake receiving plate 40. Spring 4 that restricts movement of brake plate 42 of
1 is fitted and fixed to the shaft portion 39a of the movable side disk 39, and a plurality of pressure balls 49 are fixedly protruding from the same circumference on the side surface of the brake receiving plate 40 facing the brake plate 42, while the brake A plurality of cam holes 50 are formed on the same circumference on the side surface of the brake plate 42 facing the receiving plate 40 for inserting and removing the pressure balls 49, and the movable disk 39 is rotated by rotating the brake plate 42. are moved toward and away from the brake shoe 37. By supporting the brake receiving plate 40 and the brake plate 42 on the movable disk, the mounting structure for these can be simplified, and the release spring 47 Further, by fixing the brake receiving plate 40 with the brake spring 48, the movable side disk 39 can be easily connected to the brake plate 42, and an appropriate braking function can be obtained, making it possible to easily achieve miniaturization. It is something that plays.

[Brief explanation of drawings]

Fig. 1 is an overall side view showing an embodiment of the present invention, Fig. 2 is a rear view thereof, Fig. 3 is a cross-sectional view showing the rear wheel mounting structure, and Figs. 4 and 5 are partial explanations. 6 and 7 are partial sectional views, and FIGS. 8 and 9 are sectional views of the upper part of the pumping handle. 15... Rear wheel for running, 24... High speed side transmission shaft, 37
...Brake shoe, 38...Fixed side disc, 39
...Movable side disk, 40...Brake receiving plate, 42...
Brake plate, 47...release spring, 48...braking spring,
49...pressure ball, 50...cam hole.

Claims (1)

[Claims] 1 High-speed side transmission shaft 24 that drives the running rear wheels 15
a movable side disk 39 that engages and supports the brake shoe 37 on the brake shoe 37 and faces the brake shoe 37;
The outer peripheral portion of the movable side disk 39 is slid onto a plurality of bolts 43 fixing to the gear case 33 of the high speed side transmission shaft 24 so as to move the movable side disk 39 in the axial direction of the high speed side transmission shaft 24. A shaft portion that is movably supported and is provided with a brake receiving plate 40 facing the movable side disk 39 on the opposite side from the brake shoe 37, and a center portion of the brake receiving plate 40 is integrally formed with the movable side disk 39. 39a
The brake receiving plate 40 is slidably supported on the
an outer peripheral portion of which is slidably supported on the bolt 43;
In addition, a nut 46 that restricts the movement of the brake receiving plate 40 in the direction away from the movable disk 39 is screwed onto the bolt 43, and the movable disk 39 is screwed onto the bolt 43.
A compression spring 48 is interposed between the brake receiving plate 40 and the brake receiving plate 40, and the brake receiving plate 40 is supported in pressure contact with the nut 46, while the movable side disc 39 is supported in pressure contact with the brake shoe 37, and the movable side disc 39 is supported in pressure contact with the brake shoe 37. A brake plate 42 is provided opposite to the brake receiving plate 40 on the opposite side of the disk 39, and the brake plate 42 is slidably supported on the shaft portion 39a of the movable side disc 39 and separated from the brake receiving plate 40. The spring 41 that restricts the movement of the brake plate 42 in the direction of
a, and a plurality of pressure balls 49 are protruded and fixed on the same circumference on the side surface of the brake plate 40 facing the brake plate 42, while the brake plate 42 facing the brake plate 40 A plurality of cam holes 50 are formed on the same circumference on the side surface through which the pressure balls 49 are inserted and removed, and the movable disk 39 is moved toward and away from the brake shoe 37 by rotating the brake plate 42. A self-propelled lift truck characterized by: