JPH0136967Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a vibration generator for a vibrating roller used for paving roads and the like.

(Prior art) Vibrating rollers used for road paving work have a vibration generator in the drum of the front wheel, and use the vibration generator to vibrate the drum while compacting the roadbed and compacting asphalt. It's summery.

By the way, while it is necessary to vibrate the drum strongly when compacting the roadbed, it is necessary to vibrate the drum weakly when compacting asphalt, so the vibration generator has two modes: a strong vibration mode and a weak vibration mode. It shall be configured to be switchable.

Therefore, the vibration generator is equipped with a fixed eccentric weight fixed to the vibration generating shaft and a movable eccentric weight which is rotatably attached to the vibration generating shaft and rotates by half a rotation relative to the fixed weight. When compacting a roadbed, a fixed eccentric weight and a movable eccentric weight are eccentrically moved in the same direction to generate strong vibrations due to the sum of the centrifugal forces of both eccentric weights, while during asphalt compaction, a movable eccentric weight is moved to a fixed eccentric weight. By eccentrically moving the weight in the opposite direction, weak vibrations are generated due to the difference in centrifugal force between the two eccentric weights.

Conventionally, in a vibration generating device for a vibrating roller that has been implemented by the present applicant, a fixed eccentric weight 101 is fixed to a vibrating shaft 100, as shown in FIGS. 7 and 8, and both sides of the fixed eccentric weight 101 are Excitation axis 1
A movable eccentric weight 103 is fixed to each ring 102 which is rotatably mounted on a ring 102, and a pair of stoppers 104a, 104b is provided on each ring 102, and a pair of stoppers 104a, 104 is provided on the vibration generating shaft 100.
4b is provided, and when generating strong vibration, the vibration generating shaft 105 is provided as shown in FIG.
By rotating forward, the key 105 pushes the strong vibration stopper 104a of the movable eccentric weight 103 in the rotational direction to hold the movable eccentric weight 103 eccentrically in the same direction as the fixed eccentric weight 101, while suppressing weak vibrations. When generating oscillation axis 1 as shown in Fig.
00 is reversed, the weak vibration stopper 104b of the movable eccentric weight 103 is pushed in the rotational direction with the key 105, and the movable eccentric weight 103 is fixed to the eccentric weight 10.
It was designed to be held eccentrically in the opposite direction to 1.

(Problem to be solved by the invention) In the above structure, a large impact force is applied to the key 105 every time it is switched from the strong vibration mode to the weak vibration mode and from the weak vibration mode to the strong vibration mode, causing the key 105 to be damaged. Easy to do, 2 sets of rings 1
There are drawbacks such as a large number of parts such as 02 and the key 105, a complicated structure, and a troublesome fitting operation of the key 105.

The purpose of this invention is to have a simple structure with a small number of parts,
It is an object of the present invention to provide a vibration generator for a vibrating roller that has excellent durability and can reduce manufacturing costs.

(Means for Solving the Problem) The vibration generating device for a vibrating roller according to the present invention includes an excitation shaft provided at the center of the drum of the vibrating roller, a fixed eccentric weight fixed to the excitation shaft, and a rotating shaft attached to the excitation shaft. In a vibration generator consisting of a movable eccentric weight that can be mounted and a drive device that drives an excitation shaft to rotate in forward and reverse directions, one
A pair of movable eccentric weights are provided, and locking portions for receiving the side portions of the movable eccentric weights are protruded from the end faces of the pair of fixed eccentric weights perpendicular to the axis, respectively, and locking portions for receiving the side portions of the movable eccentric weights are provided on the outer circumferential side portions of each of the movable eccentric weights. , A locked lock for strong vibrations that comes into contact with the locking part and is pushed in the rotational direction by the locking part when the movable eccentric weight is eccentric in the same direction as the fixed eccentric weight and the vibration generating shaft is rotated in one rotation direction. Weak vibration in which the movable eccentric weight is eccentrically moved in the opposite direction to the fixed eccentric weight and the vibration axis is rotated in the other direction of rotation, when it comes into contact with the locking part and is pushed in the rotational direction by the locking part. The locking surface is provided with a locking surface for weak vibrations which is parallel to the above-mentioned locking surface for strong vibrations.

(Function) When the driving device rotates the vibration generating shaft in one direction of rotation and the locking part of the fixed eccentric weight comes into contact with the strong vibration locked surface of the movable eccentric weight that is eccentric in the same direction as the fixed eccentric weight. Since this locked surface for strong vibration is pushed in the rotational direction, the fixed eccentric weight and the movable eccentric weight are rotationally driven while being eccentric in the same direction, and strong vibrations are generated.

Furthermore, when the vibration generating shaft is rotated in the other direction of rotation, the locking part of the fixed eccentric weight comes into contact with the weak vibration locked surface of the movable eccentric weight that is eccentric in the opposite direction to the fixed eccentric weight. Since the locking surface is pushed in the rotational direction, the fixed eccentric weight and the movable eccentric weight are driven to rotate while being eccentric in opposite directions, and weak vibrations are generated.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The vibrating roller R has a steel drum 1 as a front wheel as shown in FIG. It is pivotally connected to a pair of left and right support brackets 2a and 2b that are connected to each other.

The drum 1 is composed of a cylindrical drum body 1a and a pair of left and right disc-shaped ribs 1b and 1c spaced apart from each other in the drum body 1a and welded to the inner peripheral surface of the drum body 1a, A rubber support plate 4 is fixed to the outer surface of the left rib 1b via a vibration isolating rubber 3, a gear 5 is fixed to the rubber support plate 4 with bolts, and a support shaft 5a of the gear 5 is attached to the support bracket 2a.
A support shaft member 8 is fixed concentrically with the drum 1 on the outer surface side of the right rib 1c, and two sets of support shaft members 8 are mounted on the drum 1 via two sets of roller bearings 7. A pivot member 10 that is externally fitted via a ball bearing 9 and supports the support shaft member 8 is welded to a rubber support plate 11 fixed to a support bracket 2b via a vibration isolating rubber 3.

By driving the gear 5 forward or backward by a hydraulic motor 12, the drum 1 is rotated and the vibrating roller R is moved forward or backward.

Next, a description will be given of a vibration generator V which is installed in the center of the drum 1 concentrically with the drum 1 and is used to apply vibrations to the drum 1.

The vibration generator V is arranged concentrically with the drum 1, as shown in FIGS. 2 and 3, and has left and right ribs 1b,
The vibration shaft 13 supported at both ends by the vibration shaft 1c;
A fixed eccentric weight 14 is fixed eccentrically to the vibration generating shaft 13 at the center in the axial direction of the fixed eccentric weight 14, and a vibration generating shaft is disposed on the left and right sides of the fixed eccentric weight 14 in contact with the end face 14a perpendicular to the axis of the fixed eccentric weight 14. Left and right 1 rotatably fitted to 13
A pair of movable eccentric weights 15, a bearing structure that pivots the left and right ends of the vibration generating shaft 13 to the left and right ribs 1b and 1c, respectively, and an output shaft 17a fixed to the right end surface of the right pivot member 10. A hydraulic motor 1 is connected to the right end of the vibration shaft 13 via a gear coupling 16.
It consists of 7.

The left end of the vibration shaft 13 is a roller bearing 1
8, a bearing support 19, and a ring member 20, the ring member 20 is welded to the rib 1b, and the bearing support 19 is partially A cover 22 is fitted inside the ring member 20 and fixed to the ring member 20 with bolts 21, and also serves as a bearing holder, and is fixed to the bearing support 19.

Support shaft member 8 that supports the right end side of the vibration generating shaft 13
A bearing support portion 8a and an outer flange portion 8b of the bearing support portion 8a are provided at the inner end of the support shaft member 8, and a cylindrical support shaft portion 8c is provided at a portion extending to the right from the inner end of the support shaft member 8. The flange portion 8b is fixed with a bolt 24 to a ring member 23 welded to the right rib 1c, and the right end portion of the vibration shaft 13 is inserted through the bearing support portion 8a to form the support shaft portion 8c. A portion near the right end thereof is rotatably supported by a bearing support portion 8a via a roller bearing 25.

The support shaft portion 8c of the support shaft member 8 is connected to the pivot member 10.
and is rotatably supported by a pivot member 10 via two sets of ball bearings 9.

An annular motor fixture 26 is fixed with bolts to the right end surface of the pivot member 10, and a hydraulic motor 17 capable of forward and reverse rotation is fixed to this motor fixture 26, and its output shaft 17a is an excitation shaft. 13 and protrudes into the support shaft 8c, and the right end of the vibration generating shaft 13 and the output shaft 17a are connected to the support shaft 8c.
They are connected by a gear coupling ring 16 provided inside. Note that the reference numeral 27 is a spring pin.

Further, a cylindrical oil reservoir cover 28 is provided between the left and right ring members 20 and 23 to cover the vibration shaft 13 and the eccentric weights 14 and 15.
0, 23 by welding, and the oil sump cover 2
An oil reservoir 29 containing lubricating oil is formed within the oil reservoir 8 .

As shown in FIGS. 4 to 6, the fixed eccentric weight 14 has a shape in which arch-shaped locking portions 30 are symmetrically protruded from both end surfaces 14a of a horizontally oriented short cylindrical body with a large diameter. 14 is eccentrically fitted around the vibration shaft 13 and fixed to the vibration shaft 13 by means such as press-fitting or welding.

A locking surface 30 a parallel to a plane including the axis C of the vibration generating shaft 13 and the axis P of the fixed eccentric weight 14 is formed on the inner side of the locking portion 30 of the fixed eccentric weight 14 .

The above-mentioned movable eccentric weight 15 has an eccentric mass portion 15a integrally formed on the circumferential surface side with an opening angle of about 150° of a horizontal short cylindrical body, and each movable eccentric weight 15 is in sliding contact with each end surface 14a of the fixed eccentric weight 14. The eccentric mass part 15a of each movable eccentric weight 15 is fitted on the outside of the vibration generating shaft 13 so as to be rotatable, and as shown in FIG. With the center of gravity Q of the eccentric weight 15 eccentric in the same direction as the axis P of the fixed eccentric weight 14, the eccentric weight 15 comes into contact with the locking surface 30a of the locking portion 30, and the vibration shaft 13 rotates normally in the direction of arrow a. A strong vibration locked surface 31a is formed which is pushed in the rotational direction by the locking surface 30a when it is rotated.

Further, on the other side of the eccentric mass portion 15a of each movable eccentric weight 15, the axis C of the vibration generating shaft 13 is provided as shown in FIG.
Fixed the center of gravity Q of the movable eccentric weight 15 relative to the eccentric weight 1
When the oscillating shaft 13 is eccentrically eccentric in the direction opposite to the axis P of 4 and comes into contact with the locking surface 30a of the locking portion 30 and the vibration generating shaft 13 is reversed in the direction of arrow b, the locking surface 3
Locked surface 31 for weak vibrations that is pushed in the rotational direction at 0a
b is formed.

However, the outer radius r of the portion of the movable eccentric weight 15 other than the eccentric mass portion 15a is formed smaller than the shortest distance from the axis C of the vibration generating shaft 13 to the locking surface 30a, and the movable eccentric weight 15 is It is rotatable by half a rotation with respect to the swing shaft 13.

Incidentally, reference numeral 32 is a spacer that presses down the roller bearings 18 and 25 and restricts the movable eccentric weight 15 from moving in the axial direction.

As shown in Fig. 5, when the fixed eccentric weight 14 and the movable eccentric weight 15 are rotated eccentrically in the same direction, the centrifugal force acts in the same direction, and the sum of the centrifugal forces generates strong vibrations. Therefore, when compacting the roadbed, it is sufficient to vibrate in this strong vibration mode.

As shown in Fig. 6, when the fixed eccentric weight 14 and the movable eccentric weight 15 are rotated eccentrically in opposite directions, the centrifugal force acts in the opposite direction, and the difference in centrifugal force causes weak vibrations. When rolling asphalt, it is sufficient to vibrate in this weak vibration mode.

Note that the shapes of the fixed eccentric weight 14 and the movable eccentric weight 15 and the shape of the locking portion 30 are not limited to those of the above embodiment, and can be made into various shapes as necessary.

The locking portion 30 does not necessarily need to be formed integrally with the fixed eccentric weight 14, but the locking portion 30 may be formed separately.
0 may be strongly fixed to the end surface 14a of the fixed eccentric weight 14 by bolts, welding, or the like.

(Effects of the invention) As explained above, in the vibration generator for a vibrating roller of the invention, a locking part is provided protrudingly on the end face perpendicular to the axis of the fixed eccentric weight, and a locking part for strong vibration is provided on the side of the movable eccentric weight. Since it forms a stop surface and a locked surface for weak vibration, even if an impact force is applied to the locking part or the locked surface when switching from strong vibration to weak vibration or from weak vibration to strong vibration, it will not be damaged. In addition to being excellent in durability, there is no need for special parts for the locking part or the locked surface, so the number of parts is small, the structure is extremely simple, and manufacturing is easy.

In addition, since a pair of movable eccentric weights are provided outside the fixed eccentric weight, each movable eccentric weight is made smaller, the impact force when switching between strong vibration mode and weak vibration mode is reduced, and there is no need to provide a shock absorbing mechanism. Both have excellent durability.

In addition, since the movable eccentric weight is provided outside the fixed eccentric weight, there is no need for a key connection to fix the fixed eccentric weight to the vibration axis, and a fixing structure with excellent strength and durability can be adopted, reducing the number of parts. Manufacturing costs can be reduced.

Furthermore, since the locked surface for strong vibrations and the locked surface for weak vibrations are parallel to each other, the phase of the movable eccentric weight with respect to the locking surface differs by 180 degrees between the strong vibration mode and the weak vibration mode. Therefore, the difference in vibration force between the strong vibration mode and the weak vibration mode becomes sufficiently large. Therefore, the pair of movable eccentric weights can be downsized as a whole. Since the locking surface for strong vibrations and the locking surface for weak vibrations are provided on the outer peripheral side of the movable eccentric weight, the shape of the movable eccentric weight is simple and its manufacturing cost is reduced.

[Brief explanation of the drawing]

Among the drawings, FIGS. 1 to 6 show an embodiment of the present invention, and FIG. 1 is a side view of the vibrating roller, and FIG.
The figures are a sectional view taken along the line shown in Fig. 1, Fig. 3 is a longitudinal sectional front view of the vibration generator, Fig. 4 is a perspective view of a fixed eccentric weight fixed to the vibration generating shaft, and Fig. 5 is a normal rotation state. 3
Figure-line sectional view, Figure 6 shows the reversed state.
It is a figure equivalent figure. FIGS. 7 and 8 are views corresponding to FIG. 5 and FIG. 6 of the conventional apparatus, respectively. R...Vibration roller, V...Vibration generator, 1...
... Drum, 13 ... Vibration shaft, 14 ... Fixed eccentric weight, 14a ... Axis perpendicular end surface, 15 ... Movable eccentric weight, 17 ... Hydraulic motor, 30 ... Locking part, 31
a... Locked surface for strong vibration, 31b... Locked surface for weak vibration.

Claims (1)

[Scope of Claim for Utility Model Registration] A vibration shaft provided at the center of the drum of a vibrating roller, a fixed eccentric weight fixed to the vibration shaft, a movable eccentric weight rotatably attached to the vibration shaft, and a vibration shaft arranged in the correct direction. In a vibration generator comprising a drive device that rotates in reverse, a pair of movable eccentric weights are disposed close to the outside of the pair of axis-perpendicular end surfaces of the fixed eccentric weight, and the pair of movable eccentric weights A locking part for receiving the side part of the movable eccentric weight is provided on the end face perpendicular to the axis, and the movable eccentric weight is eccentrically moved in the same direction as the fixed eccentric weight on the outer circumferential side of each of the movable eccentric weights, and an excitation shaft is formed. A locked surface for strong vibration that comes into contact with a locking part and is pushed in the rotational direction by the locking part when rotated in one rotational direction, and a movable eccentric weight is eccentrically moved in the opposite direction to the fixed eccentric weight to generate vibration. A locked surface for weak vibrations that comes into contact with the locking part and is pushed in the rotational direction by the locking part when the shaft is rotated in the other direction of rotation, and is parallel to the locked surface for strong vibrations. A vibration generating device for a vibrating roller, characterized in that it is provided with a locking surface for weak vibration.