JPS6330620Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting device for lifting a driver's cab of an automobile, etc.

Conventionally, when lifting a heavy object that causes the object to oscillate, such as an automobile driver's cab, there has been a method for lifting the object using a hydraulic cylinder that can withstand the oscillation. was used.

However, when a lifting device is required to lift something that is not very heavy, such as the cab of a medium-sized truck, it is easier to use a lifting device than the conventional expensive lifting device that uses precision-machined hydraulic cylinders. Therefore, an inexpensive lifting device is desired.

SUMMARY OF THE INVENTION In response to the above-mentioned needs, it is an object of the present invention to provide a lifting device with a simple structure and low cost, which is suitable for lifting a swinging medium-heavy object.

If the present invention is explained based on examples, the first
The figure shows a side sectional view of a lifting device as an embodiment of the present invention, and a pin (not shown) fixed to the chassis of an automobile is pivotally connected to a hole 2a in a housing 2. and drive shaft 3
is pivotally supported by the housing 2, and a bevel gear 3a is fitted onto the drive shaft 3.

A DC motor 1 is screwed onto a housing 2, and the power of the DC motor is decelerated by a reducer 1a, and the decelerated power is output to an output shaft 1b.
A bevel gear 1c is fitted into b, and the bevel gear 1c and the bevel gear 3a are engaged with each other to enable power transmission.

The rod-shaped support member 4 is a universal joint 3b.
A male thread 4a is cut into the support member 4, and a flange 4b fixed to the support member 4 is pivotally supported by the housing 2 via a thrust bearing 2b.

The transition material 5 fixes the female thread 5b, and the female thread 5b and the male thread 4a of the support material 4 are threadedly engaged by the male thread 4a screwing into the female thread 5b. A pin (not shown) fixed to the driver's cab of the automobile is pivotally connected to the bore 5a.

The driver's cab is configured to be pivotally connected to a portion of the chassis at a position different from the position where the pin is fixed.

To explain the operation in the above configuration, the DC motor 1 is operated from the state shown in the figure, and the output shaft 1 is
By rotating b in one direction, the output shaft 1
b rotates the support member 4 via the gears 1c and 3a and the drive shaft 3.

As a result, as the male thread 4a rotates relative to the female thread 5b, the female thread 5b moves upward (to the right in FIG. Lift up the table.

Conversely, when lowering the cab, the DC motor 1
If it is set to reverse rotation and operated, the male screw 4a will rotate in the opposite direction to the female screw 5b, and the transition material 5 will be lowered, contrary to the above-mentioned action.

In the above-mentioned operation, the purpose of lifting the cab is necessary when inspecting or repairing the engine installed under the cab. When moving or lowering the driver's cab, the driver's cab is raised or lowered with an inclination centered on the aforementioned pivot point with the chassis, and the inclination is in the axial direction of the transition material 5. Apply a diagonal component of the weight of the cab to the vehicle, and lift it.
Alternatively, during the lowering action, an oscillating impact force in the oblique direction occurs, which tends to exert a bending moment on the support member 4 and the drive shaft 3.

In such cases, in this invention,
Universal joint 3b between drive shaft 3 and support member 4
Since the drive shaft 3 or support member 4
Even if the bending moment tries to act on the universal joint 3b, the bending moment
It is structured so that it can be escaped.

In the above description, the output shaft 1b and the drive shaft 3 are configured to be perpendicular to each other, but the drive shaft 3 and the output shaft 1b may be arranged in parallel, and the transmission of both shafts may be driven by spur gears. .

Further, in the above embodiment, a case has been described in which the cab of a car is lifted, but the lifting device of the present invention is an object other than the cab, and when the lifting device is loaded, the transition material 5 is moved in an oblique direction. The fact that it can be used for general use in cases where it generates a force and is lifted up in an oscillating manner is that
It will be easy to understand.

As is clear from the above description, the lifting device of the present invention has the universal joint 3b interposed between the drive shaft 3 and the support member 4, so that the support member 4 and the drive member are Even if a bending moment is applied to the shaft 3, it becomes possible to escape the bending moment, and the support member 4
or the drive shaft 3, gear 3a or 1b.
This ensures that there is nothing that would cause unreasonable conditions.

As a result, by relaxing the bending moment,
By reducing the amount of flesh on each part of the lifting device of the present invention and simplifying its configuration,
It becomes possible to reduce the weight of the entire device, which also contributes to lowering the manufacturing cost of this device.

Furthermore, in the lifting device of the present invention, when the thrust bearing 2b is provided on the support member 4 side, no normal force is applied to the universal joint 3b, so the universal joint 3b can be made simple and inexpensive. It is something.

Furthermore, the fact that the lifting device of the present invention can be made lightweight as described above means that when this device is used as a cab lifting device for a car, as in the embodiment, it can contribute to reducing the weight of the car. It is what it is.

[Brief explanation of the drawing]

FIG. 1 shows a lifting device as an embodiment of the present invention in a sectional side view.
The symbols used in the examples are as follows. 1...DC motor, 1a...Reducer, 1b...
Output shaft, 1c...Gear, 2...Housing, 2a
...Drilling, 2b...Thrust bearing, 3...Drive shaft, 3a...Gear, 3b...Universal joint,
4...Supporting material, 4a...Male thread, 4b...Flange, 5...Transition material, 5a...Drilling, 5b...Female thread.

Claims (1)

[Claims for Utility Model Registration] The supporting member 4 and the transitional member 5 are threadedly engaged, and the supporting member is configured to: (a) rotate with respect to the transitional member around the axis of the threaded screw that is threadably engaged with the supporting member 4; b; Interlocking with the drive shaft 3 on one side in the axial direction via the universal joint 3b centering on the part that is threadedly engaged with the transition material; c; The other side in the axial direction is not connected at all. d; the universal joint side in the axial direction is connected to the housing 2 by a thrust bearing 2b;
The transition member is configured to move in the direction of the threadedly engaged axis due to the rotation of the support member, and the drive shaft is connected to the electric motor. Lifting device configured to be driven by