JPH0128090Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a vibration generator for a road machine such as a vibrating roller.

A vibrating roller generally used for soil compaction work can be roughly divided into a vibrating roller drive unit 1 which has a driver's seat, an engine, etc., as shown in Fig. 1, for example.
It consists of a vibrating roller vibrating ring portion 2 having a vibrating ring 3 attached to a frame via vibration isolating rubber, and the vibrating ring 3 has a built-in vibration generator A.

In soil compaction work using vibrating rollers,
The properties of soil (rock, sand, clay, etc.) (differences in particle size, water content, viscosity) are not always constant, and therefore the compaction performance (degree of compaction) also varies depending on the soil quality. It is desired to use a generator to arbitrarily change compaction conditions such as vibration force, frequency, and amplitude, and to perform compaction work efficiently under working conditions suitable for the soil properties at the site. As a vibration generator capable of making the amplitude variable, there is a ``vibration generator'' disclosed in Utility Model Application No. 56-67418 by the present inventor.

As shown in FIGS. 2 to 4, the vibration generator A includes a shaft 4 rotatably provided within a vibration ring 3.
An inner eccentric weight 11 is provided on the shaft 4, and an outer eccentric weight 12 is rotatably provided on the shaft 4.
2, a pin 13 is provided at a position 90° out of phase with the direction of centrifugal force, and an inner eccentric weight 11 is installed.
Engagement grooves 14 and 15 that engage with the pin 13 are provided at positions 180° out of phase with each other, so that two-stage vibration can be generated by forward and reverse operation of the motor that drives the shaft 4 in forward and reverse rotation. This is what I did.
However, the vibration generator A has an outer eccentric weight 12.
Since it is rotatably provided on the shaft 4, its shape and structure are complicated and large, which causes problems in high manufacturing costs and difficulty in assembly.

The purpose of the present invention is to generate two levels of vibration force and amplitude by forward and reverse operation of the motor, which is the same as that of the above-mentioned Utility Model Application No. 56-67418, but the cost and difficulty of assembling the device is An object of the present invention is to provide a vibration generator that can reduce the vibration.

The following is an example of the vibration generator of the present invention.
This will be explained with reference to FIG. 1 and FIGS. 5 to 8.

In FIG. 1, 1 is a vibrating roller drive section, and 2 is a vibrating roller vibrating ring section. An engine 6 is mounted on the vehicle body 5 of the vibrating roller drive unit, and a drive wheel 7 is drivably mounted thereon, and a driver's seat 8 is provided at the top. The vibrating wheel 3 is connected to the vibrating roller drive unit 1 so as to be able to be steered left and right, and the vibrating wheel 3 is attached to the frame 10. Such a vibrating roller runs back and forth on the road surface while vibrating the swinging wheel 3 to compact the road surface.

FIG. 5 shows details of the vibrating ring 3, with flanges 21 and 2 on the left and right inner sides of the frame 10, respectively.
2 are firmly fixed to each other, and flanges 23 and 24 are attached oppositely to them via vibration isolating rubbers 25 and 26. Support members 27 to 30 are respectively fixed at intervals in the axial direction inside the vibrating ring 3, and are supported by two vibration generators B and C arranged along the axis of the vibrating ring 3, respectively. Member 27, 2
8, 29, and 30 via bearings. Therefore, the vibration ring 3 rotates while being supported by the frame 10, and the vibration generators B and C are rotatably supported by the vibration ring 3.

As shown in FIGS. 5 to 8, the vibration generators B and C include a rotating shaft portion 31 and an eccentric weight portion 32.
The rotating shaft portion 31 of the inner eccentric weight 33 is rotatably supported via bearings on support members 27 to 30 provided inside the vibrating ring 3. An outer eccentric weight 34 is rotatably and slidably attached to the outer periphery of the rotating shaft portion 31.

The outer eccentric weight 34 is connected via coupling members 37 and 38 such that a pair of eccentric weight pieces 35 and 36 facing each other sandwich the eccentric weight portion 32 of the inner eccentric weight 33, and one The engaging member 39 is provided at a position 90° out of phase with respect to the centrifugal direction of the outer eccentric weight 34, while the one engaging member 39 is provided at a position 180° out of phase with respect to the inner eccentric weight 33. Engagement grooves 40 and 41 that engage with the member 39 are provided.

The main body of the vibration motor 42 is attached to the flange 23, and the rotating shaft of the vibration motor 42 is attached to the rotating shaft portion 31 of the inner eccentric weight 33.
Thereby, the inner eccentric weight 33 of the vibration generator B
is driven to rotate. In addition, two vibration generators B,
The inner eccentric weights of C are connected via a spline shaft 43, whereby the inner eccentric weights of the two vibration generators B and C are driven to rotate in the same phase.

Then, by rotating the inner eccentric weight 33 clockwise as shown by the arrow in FIG. When the inner and outer eccentric weights 33 and 34 are engaged and the centrifugal force directions of the inner and outer eccentric weights 33 and 34 are in the same direction, the sum of the centrifugal force vectors (mr) ₁ and (mr) ₂ of the inner and outer eccentric weights 33 and 34 becomes mr. Obtain large vibration force.

Further, by rotating the vibration motor 42 counterclockwise as shown by the arrow in FIG. 8, the engaging member 39 is engaged with the other engaging groove 41 of the inner eccentric weight 33, and the inner and outer eccentric weights are If the centrifugal force directions of weights 33 and 34 are shifted by 180 degrees, the resultant centrifugal force vector
mr′ becomes (mr) ₂ − (mr) ₁ , and the vibration force becomes smaller.

In this embodiment, the outer eccentric weight 34 of the vibration generator is provided with an engaging member 39 at a position 90° out of phase with respect to the centrifugal force direction, and the inner eccentric weight 33 is 180° out of phase with respect to the centrifugal force direction. An example is shown in which the engagement grooves 40 and 41 are provided at shifted positions.
Any of those angles can be a predetermined angle, thereby allowing the resultant centrifugal force vector to have a predetermined magnitude.

Further, in this embodiment, the connecting members 37 and 38 of the eccentric weight pieces 35 and 36 of the outer eccentric weight 34 are pin-shaped, but they can be formed into various shapes such as a plate shape. Although a pair of vibration generators B and C are exemplified as being connected in the axial direction, it is also possible to use one or three or more vibration generators.

Since the present invention is constructed as detailed above, the synthetic centrifugal force vector caused by the inner and outer eccentric weights can be made to have a predetermined direction and magnitude by rotating the vibration motor in the forward or reverse direction. Moreover, since the device has a simple configuration, the cost is low and assembly is easy.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the vibrating roller, Figs. 2 to 4 are explanatory diagrams showing the structure and relative positional relationship of the inner and outer eccentric weights in the conventional vibration generator, and Fig. 5 is the invention of the present invention. FIG. 6 is a cross-sectional front view of the vibration generator of the present invention, and FIGS. 7 and 8 are explanatory diagrams showing the relative positional relationship of the outer eccentric weight in FIG. 6. It is. DESCRIPTION OF SYMBOLS 1... Vibrating roller drive part, 2... Vibrating roller vibrating ring part, 3... Vibrating ring, 9... Connection pin, 10... Frame, 27-30... Supporting member, 31... Rotating shaft part,
32...Eccentric weight part, 33...Inner eccentric weight, 34
...Outer eccentric weight, 35, 36...Eccentric weight piece, 3
7, 38...Connection member, 39...Engagement member, 40, 4
1...Engagement groove.

Claims (1)

[Scope of utility model registration request] The rotating shaft portion of the inner eccentric weight, in which the rotating shaft portion and the eccentric weight portion are integrated, is rotatably supported by a support member provided inside the vibration ring;
An outer eccentric weight is rotatably and slidably attached to the outer periphery of the rotating shaft portion of the inner eccentric weight, and a pair of eccentric weight pieces facing each other are connected to the eccentric weight of the inner eccentric weight. The parts are connected via a connecting member so as to sandwich the outer eccentric weight, and one connecting member is provided at a position shifted in phase by a predetermined angle from the centrifugal direction of the outer eccentric weight, and the inner eccentric weight is connected to the inner eccentric weight. Engagement grooves that engage with the one coupling member are provided at positions that are out of phase with each other by a predetermined angle, and a vibration motor for driving the inner eccentric weight in forward and reverse rotation is provided in the inner A vibration generator for a vibrating roller, characterized in that it is attached to a rotating shaft portion of an eccentric weight.