JP2001113474A - Continuous impact work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous impact work machine capable of properly supporting shaft parts of a rotary body over a long period. SOLUTION: In a continuous impact work machine having a rotary body 6 rotating in a housing 1, a striking body 65 held by this rotary body 6 and a striking work body 3 push-moved by this striking body 65 when this striking body 65 turns, the continuous impact work machine has at least one or more of bearing holders 2A, 2B composed of a construction material harder than the housing 1, and these bearing holders 2A, 2B have cylindrical parts 20A, 20B for internally installing either of plural bearings 75A, 75B for supporting shaft parts 60a, 60b of the rotary body 6 and flange parts 21A, 21B connected to outer peripheral surfaces of these cylindrical parts 20A, 20B and capable of being installed in and fixed to the housing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous impact working machine configured to generate a high frequency continuous impact force so that a desired operation utilizing the continuous impact force can be appropriately performed. .

[0002]

2. Description of the Related Art For example, a continuous impact working machine typified by a concrete breaker or the like generally has a striking piston built in a cylindrical main body so as to be movable in an axial direction, and an expanding force by compressed air, or The rotation output of the prime mover is forcibly reciprocated by the reciprocal driving force converted by the crank mechanism, and the striking work body supported at the lower part of the main body is continuously hit in the axial direction by the reciprocation of the striking piston. Have been. In such a reciprocating drive type continuous impact working machine, there is a problem that the working machine body vibrates up and down violently due to a reaction force when the hitting piston is reciprocated. Also, it has been difficult to increase the impact frequency in order to forcibly reciprocate a striking piston having a constant inertial mass.

[0003] Therefore, a rotary type continuous impact working machine which solves the problem of the reciprocating type continuous impact working machine, has low vibration and can easily increase the shock frequency,
It has already been proposed by the applicant of the present application (for example, JP-A-4-322977).

In this conventional rotary type continuous impact working machine, as shown in FIG. 5 of the present application, a rotating body 91 is rotatably provided inside a housing 90. The hitting body 92 is movably held so as to be eccentric from the rotation axis Ca. A hitting body 93 is supported by the housing 90 so as to be able to reciprocate in a fixed direction, and the outermost periphery of the turning trajectory of the hitting body 92 when the rotating body 91 rotates is a top surface 93 a of the hitting body 93.
It is configured to be able to interfere with The rotating body 91 has a pair of shafts (not shown), and the pair of shafts is provided by a bearing held by a housing 90 or a bearing holder (not shown) fixedly attached to the housing 90. Supported. Rotating body 91
Includes a part 94 serving as a balance weight.
Is provided.

[0005] In the continuous impact working machine having such a configuration, the rotating state of the rotating body 91 when the striking work body 93 is at an axial position that does not interfere with the rotational locus of the striking body 92, that is, the rotating body 91 In the idling state, the total center of gravity of the rotating body 91 and the striking body 92 can coincide or substantially coincide with the rotation axis Ca of the rotating body 91. Therefore, in this case, no reciprocating vibration occurs, and the rotating body can be rotated at high speed. On the other hand, when the hitting body 93 takes an axial position that interferes with the rotation trajectory of the hitting body 92, the hitting body 92 moves every time the rotating body 91 makes one rotation.
The top surface 93a of the striker 93 is hit. To be precise, the hitting body 92 pushes the hitting body 93 outwardly in the axial direction (the direction of the arrow N1) with a strong centrifugal force while rolling against the top surface 93a of the hitting body 93. Since the rotating body 91 rotates at a high speed, the hitting body 9
The force repeatedly applied to 3 becomes a continuous impact force in the axial direction of the striker 93.

[0006]

However, in the continuous impact working machine having the above-described structure, there is a case where a problem in strength occurs in a portion supporting the shaft portion of the rotating body 91 as described below.

That is, conventionally, the housing 9
The 0 and the bearing holder are, for example, aluminum cast products from the viewpoint of reducing the weight of the entire working machine and reducing the manufacturing cost. On the other hand, when the above-mentioned conventional continuous impact working machine is used, a radial impact force acts repeatedly on the bearing supporting the shaft portion of the rotating body 91. For this reason, in the related art, the portion of the housing 90 or the bearing holder, on which the bearing is mounted, is distorted due to the impact force, and the smooth rotation of the rotating body 91 is impaired. There was a case. More specifically, the bearing has a generally cylindrical outer ring, and this outer ring is attached to, for example, an opening provided in the housing 90. However, when a large impact force is repeatedly applied to the bearing over a long period of time, the inner peripheral surface of the opening of the housing 90 may be distorted, and the outer ring of the bearing may rattle.

The inventor of the present invention aims to solve such a problem by casting or press-fitting an iron collar (tubular body) into a part of a housing 90 which is, for example, an aluminum casting. Tried to make the collar hold the bearing. However, even when such a means is employed, if the continuous impact working machine is used for a long period of time, the portion of the housing 90 holding the collar may be distorted, and the bearing may be rattled. was there.

The present invention was conceived under such circumstances, and it is an object of the present invention to provide a continuous impact working machine capable of appropriately supporting the shaft of a rotating body for a long period of time. It is an issue.

[0010]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

[0011] A continuous impact working machine provided by the present invention comprises a housing, a rotating body rotating in the housing and having a pair of shafts, a plurality of bearings supporting the pair of shafts, A hitting body eccentrically held from the center of rotation of the rotating body and held by the rotating body, and supported by the housing so as to be able to reciprocate, and when the hitting body turns with the rotation of the rotating body, And a striking working body pushed by contact with the striking body, wherein at least one bearing holder made of a material harder than the housing is provided.
Having the above, the bearing holder,
A tubular portion in which any of the plurality of bearings is mounted, and a flange portion connected to the outer peripheral surface of the tubular portion and being mounted on the housing, I have.

In the present invention, at least one or more bearing holders are provided, and all or at least a part of the plurality of bearings supporting the shaft portion of the rotating body are mounted and held on the cylindrical portion of the bearing holder. be able to. Since the bearing holder is made of a material harder than the housing, it is possible to prevent the cylindrical portion of the bearing holder from being easily distorted even if an impact force is repeatedly applied to the bearing. Further, since the bearing holder is attached to the housing using the flange portions, an impact force acts on a bearing mounted on the cylindrical portion, and the impact force is transmitted to the bearing holder. Sometimes
This impact force can be received in such a manner as to be distributed over a wide area in various parts of the housing. That is, it is possible to prevent the impact force from acting intensively on a specific location in a narrow area of the housing. Therefore, in the present invention, even when the housing is made of an aluminum casting having a relatively small mechanical strength, the shaft of the rotating body can be reliably and firmly supported, and the smoothness of the rotating body can be improved. It is possible to secure a proper rotation operation for a long period of time. As a result, the maintenance of the continuous impact working machine is facilitated or the service life is extended.

In a preferred embodiment of the present invention, each of the bearings is a needle bearing.

According to such a configuration, the bearing itself can be hardly damaged. That is, when the needle bearing is used, the axial contact length between the shaft portion of the rotating body and the needle and the axial contact length between the needle and its outer race (outer ring) can be increased. For this reason, when the needle bearing is used, it is possible to make the shaft of the rotating body less likely to be twisted as compared with the case where the ball bearing is used, for example. Therefore,
The impact force acting on the pair of shafts can be appropriately dispersed and received by each of the multiple needle bearings, preventing or suppressing the large impact force from concentrating on some needle bearings. And the damage can be avoided.

In another preferred embodiment of the present invention, of the pair of shafts of the rotating body, the first shaft is
A first bearing holder configured to receive a rotational driving force from the outside of the housing and holding a bearing of the first shaft portion is provided as the bearing holder.

According to such a configuration, the support of the shaft of the rotating body is more suitable. That is, when the first shaft portion of the rotating body is a shaft portion that receives a rotational driving force from the outside, the load burden received by the first shaft portion is reduced by the shaft portion on the opposite side (the second shaft portion). It has been empirically found that the load applied to the shaft portion tends to be larger than that of the bearing portion, and in general, the bearing that supports the first shaft portion is most likely to rattle. On the other hand, according to the above configuration,
The bearing of the first shaft portion can be appropriately held by the first bearing holder, and rattling of the bearing can be effectively prevented.

In another preferred embodiment of the present invention, the apparatus further comprises a pressing cover having a cylindrical portion and a flange portion connected to the cylindrical portion, and the pressing cover is formed of the pressing cover. The tubular portion fits over the tubular portion of the first bearing holder, and the flange portion of the holding cover sandwiches the flange portion of the first bearing holder between the flange portion and the housing. And attached to the housing.

According to such a configuration, by attaching the holding cover to the housing, the first bearing holder can be moved in either the thrust direction (the width direction of the housing) or the radial direction of the shaft of the rotating body. Can be positioned and fixed. Therefore, the mounting strength of the first bearing holder to the housing can be easily increased.

In another preferred embodiment of the present invention, the first shaft portion protrudes outward in the width direction of the housing from a cylindrical portion of the first bearing holder, and the first shaft portion protrudes from the cylindrical portion. In the portion, a second gear meshing with a first gear that transmits a rotational driving force for rotating the rotating body from outside the housing is arranged in the tubular portion of the holding cover. 5. The continuous impact working machine according to claim 4, wherein an opening for disposing the first gear is provided on a peripheral surface of the cylindrical portion of the holding cover, the mounting being provided. 6.

According to such a configuration, for example, a driving source is provided outside the housing, and the driving force generated by the driving source is applied to the rotating body by using the first gear and the second gear. Can be properly communicated. The second gear can be covered by the holding cover, and can be prevented from being unnecessarily exposed to the outside. Further, since the first gear can be arranged in the opening formed on the peripheral surface of the cylindrical portion of the holding cover, the center of the first gear can be made closer to the center of the second gear. This means that when transmitting the rotational force from the first gear to the second gear with a predetermined reduction ratio, the diameter of each of these two gears can be reduced. Therefore, the size of the entire continuous impact working machine can be reduced. Further, if the diameter of the first gear can be reduced, the driving force transmission shaft for transmitting the driving force to the first gear can be made closer to the housing by that much, and the driving force transmission shaft The twisting force generated between the housing and the housing can be reduced.

In another preferred embodiment of the present invention, the bearing holder further includes a second bearing holder for holding a bearing of a second shaft of the pair of shafts of the rotating body. The second bearing holder is attached to the housing so as to close an opening provided on one side in the width direction of the housing, and has a step portion fitted into the opening. Have.

According to such a configuration, in addition to the first bearing holder, the second bearing holder can be used to hold the respective bearings of the pair of shaft portions of the rotating body. In addition, the support of one shaft of the rotating body can be made more appropriate. Further, the second bearing holder can be used as a cover for closing the opening of the housing, and it is not necessary to separately attach a dedicated cover for closing the opening.
Further, by fitting the step portion of the second bearing holder into the opening, the second bearing holder can be fixed so as not to move in the radial direction of the shaft portion of the rotating body. The mounting strength of the second bearing holder can be easily increased.

In another preferred embodiment of the present invention, the rotating body is provided with a hole through which the hitting body is fitted, and the hitting body is provided with a hole through the hole. In the direction, it is sandwiched between the respective flange portions of the first and second bearing holders.

According to such a configuration, it is possible to prevent the striking body fitted in the hole of the rotating body from moving in the penetrating direction of the hole.
It can be regulated by the first and second bearing holders. Therefore, it is not necessary to separately provide a dedicated member for restricting the movement of the hit body.

[0025] In another preferred embodiment of the present invention, a third bearing holder made of a member harder than the housing is further provided.
The bearing holder has a cylindrical portion in which a bearing for supporting the protruding portion of the first shaft portion is mounted, and is connected to the outer peripheral surface of the cylindrical portion, and is attached and fixed to the holding cover. And a flange portion provided with a step portion that fits with the tubular portion of the pressing cover.

According to such a configuration, the first shaft portion of the rotating body can be further supported by the bearing mounted on the third bearing holder. It can be strong. Of course, like the first and second bearing holders, the third bearing holder is made of a member harder than the housing, and has a stepped portion that fits into the cylindrical portion of the holding cover. A part of the third bearing holder is not easily distorted or easily displaced. Further, according to the configuration, the third
With this bearing holder, the protruding portion of the shaft of the rotating body can be covered in a good shape.

Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of the continuous impact working machine according to the present invention. FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a sectional view taken along line III-III of FIG. FIG.
FIG. 4 is an exploded cross-sectional view showing a main member of the structure shown in FIG.

As shown in FIG. 1, the continuous impact working machine A of the present embodiment is configured to be used as a shovel. The continuous impact working machine A is generally configured to include an engine 8, a hitting mechanism B, and a hitting body 3. The striker 3 has a shovel shape. The engine 8 is surrounded by a rear handle 80 formed in a frame shape, and the engine speed can be controlled by operating a throttle operation lever 81 attached to the rear handle 80. A grip handle 82 is provided forward (or below) the rear handle 80. The continuous impact working machine A is operated in a state where the grip handle 82 and the rear handle 80 are gripped by an operator.

The striking mechanism B is provided with a clutch housing 83 for centrifugal clutch and an operating pipe 84 for the engine 8.
And has a structure in which the impact force can be continuously applied to the striker 3 using the driving force of the engine 8. As shown in FIG. 3, the hitting mechanism B includes a housing 1, a rotating body 6, a hitting body 65, a first bearing holder 2A, a second bearing holder 2B, a third bearing holder 2C, and A holding cover 4 is provided.

The housing 1 is formed of, for example, aluminum die-cast, and has a space 11 penetrating in the width direction (the left-right direction in FIG. 3). For this reason, both sides 10a and 10b in the width direction of the housing 1
First and second openings 11a and 11b are formed. The housing 1 is connected to the engine 8 via the operation tube 84 and the clutch housing 83 for the centrifugal clutch described above.

The rotating body 6 is accommodated in the space chamber 11 of the housing 1 and has a pair of shaft portions 60a and 60b protruding from both side surfaces in the width direction. The axis (long axis) of the pair of shaft portions 60a and 60b is the rotation axis C of the rotating body 6. The shaft portion 60a is formed to have a dimension longer than the shaft portion 60b, and the needle bearings 75A, 75C
Supported by On the other hand, the shaft portion 60b
It is supported by one needle bearing 75B. Each of these needle bearings 75A to 75C is provided with an annular member forming an outer race, and a plurality of needles disposed inside the annular member and directly in rolling contact with the shaft portion 60a or 60b to be supported. It is composed of

The shaft portion 60a receives a driving force from the engine 8. That is, in the operation tube 84,
A transmission shaft 85 for transmitting the rotation of the output shaft of the engine 8 is built in. The transmission shaft 85 has a first bevel gear 86
A is attached. A second bevel gear 86B meshing with the first bevel gear 86A is attached to the shaft portion 60a so as to be sandwiched between two needle bearings 75A and 75C, and the rotational force of the transmission shaft 85 is reduced by two bevel gears. Gear 8
The rotating body 6 rotates by being transmitted to the shaft portion 60a via 6A and 86B. A pair of shafts 6
A specific structure for supporting Oa and 60b by bearings 75A to 75C will be described later.

The rotating body 6 has a form in which a pair of flange portions 6a and 6b having a pair of shaft portions 60a and 60b are integrated by a cylindrical connecting portion 6c having a function of a balance weight. The axis of the connecting portion 6c is eccentric with respect to the rotation axis C of the rotating body 6. Each flange 6a,
6b, a pair of holes 61 is provided at a position eccentric opposite to the connecting portion 6c with respect to the rotation axis C.

The hitting body 65 is made of, for example, a hard metal and has a columnar shape. Both ends in the longitudinal direction of the hitting body 65 are loosely held in a pair of holes 61 of the rotating body 6. More specifically, as best seen in FIG.
Each of the holes 61 has an elliptical shape whose minimum curvature on the inner surface substantially matches the curvature of the circumference of the hitting body 65.
Is rotatable with both ends constrained by a pair of holes 61, and is allowed to play in a direction perpendicular to the axis within a range allowed by a gap with the inner surface of the hole 61.
If the striking body 65 is rotatable in the pair of holes 61, the striking body 65 is
4 can be operated so as to press the top surface 30 downward while rolling on the top surface 30 when the hit body 65 collides with the top surface 30.
It is possible to reduce the amount of heat generated by contact friction with zero.

A holder 15 for holding the shank portion 34 of the striker 3 is formed in a portion of the housing 1 opposite to the operation tube 84 (a lower portion in FIGS. 2 to 4). In the present embodiment, the shank portion 34 is
It is divided into a portion 34a and a second portion 34b. First
The portion 34a is fitted and held by a boss-shaped first holder 15a fixedly attached to the housing 1 so as to penetrate the outer peripheral wall 12 of the housing 1 in the vertical direction. The first portion 34a is slidable in the axial direction. However, at the lower end of the first portion 34a,
A large-diameter flange 36 is formed, and the large-diameter flange 36 is provided at upper and lower steps 37a, 3a of a large-diameter hole 37 formed in a connecting portion between the first holder 15a and the second holder 15b.
7b restricts the reciprocating stroke in the axial direction to a certain distance.

Top surface 3 of first portion 34a of shank portion 34
0 is a flat surface parallel to the rotation axis C of the rotating body 6. As shown in FIG. 2, when the first portion 34 a is located at the upper end of the reciprocable stroke, the outermost periphery of the turning trajectory of the striking body 65 associated with the rotation of the rotating body 6 and the top surface 30 interfere with each other. It is stipulated that At the time of this interference, the first portion 34a of the shank portion 34 receives a downward pushing force by the rotating body 6, and accordingly, the second portion 34b is also pushed down. The top surface 30 is provided with a buffer hole 31 having an appropriate depth. The buffer hole 31 reduces the mutual repulsion force when the striker 65 rotates on the top surface 30, and the striker 65 contacts the top surface 30 for a certain period of time while lowering the top surface 30. It helps to work properly down. The same applies to a buffer hole 73 provided on a top surface 72a of a convex portion 72 described later.

The second portion 34b of the shank portion 34 is slidably fitted and held in a boss-shaped second holder 15b fixedly attached to the housing 1, and is well shown in FIG. In addition, it is also penetrated and held by the third holder 15c supported by each end of the pair of slide rods 70. The pair of slide rods 70
The housing 1 is slidably inserted into a pair of through holes 19 provided in the housing 1. A concave portion 38 is formed on a side surface of the second portion 34b over a predetermined length in the axial direction. An engageable stopper pin 39 is provided. This stopper pin 3
9 and the concave portion 38, the second portion 34
As for b, its rotation operation is regulated, and the relative reciprocating movement stroke with respect to the third holder 15c is regulated to a certain distance.

The other ends of the pair of slide rods 70 are connected to each other by a connecting member 71, and the connecting member 71 has a protrusion slidably inserted into a through hole 18 provided in the outer peripheral wall 12 of the housing 1. A part 72 is provided. The convex portion 72 faces the top surface 30 of the shank portion 34 with the rotation axis C interposed therebetween. When the convex portion 72 is at the lowest position, the top surface 72 a is used for rotating the rotating body 6. Accordingly, it can interfere with the outer peripheral surface of the hitting body 65 which turns. At the time of this interference, the projecting portion 72 is
5 is pushed upward.
On the top surface 72a, a buffer hole 73 similar to the buffer hole 31 of the shank portion 34 is provided. The projection 72 and the connecting member 71 are configured so that the elastic force of the spring 74 always acts upward.
The top surface 72a is designed not to interfere with the hit body 65. Such a configuration serves to forcibly push upward the striking body 3 pushed down by the striking body 65 as described later.

The first to third bearing holders 2A,
Each of 2B and 2C is made of a member harder than the housing 1, and is made of, for example, iron. All of these can be formed by pressing an iron plate, and have a hat-shaped cross section. More specifically, as best shown in FIG. 4, the first bearing holder 2A has a cylindrical portion 20A having both ends opened and a substantially disk-shaped portion connected to the outer peripheral surface at one end of the cylindrical portion 20A. 21A. A needle bearing 75A is mounted in the cylindrical portion 20A. Flange 21A
Is provided with a plurality of bolt insertion holes 23A. The first bearing holder 2A is attached to the housing 1.
It will be described later together with the mounting structure of the third bearing holders 2B and 2C and the holding cover 4.

The second bearing holder 2B has a cylindrical portion 20B having an open end, and a substantially disk-shaped flange portion 21B connected to the outer peripheral surface of one end of the cylindrical portion 20B. The flange portion 21B is provided with a step 22B that can be fitted into the second opening 11b of the housing 1 and a plurality of bolt insertion holes 23B. A needle bearing 75B is mounted inside the cylindrical portion 20B. The third bearing holder 2C includes a cylindrical portion 20C having one end opened,
The cylindrical portion 20C has a substantially disk-shaped flange portion 21C connected to the outer peripheral surface at one end. In the cylindrical portion 20C,
A needle bearing 75C is mounted. The flange portion 21C is provided with a plurality of bolt insertion holes 23C.

The holding cover 4 is, for example, a housing 1
And a tubular portion 40 which is made of the same material as that of the first bearing holder 2A and which can be externally fitted to the tubular portion 20A of the first bearing holder 2A.
0 has a flange portion 41 connected to the outer peripheral surface at one end. However, another cylindrical portion 44 is integrally connected to the cylindrical portion 40 so as to be orthogonal to the cylindrical portion 40.
One end of the tubular portion 44 is connected to the operation tube 84. An opening 42 is formed in the peripheral surface of the cylindrical portion 40, and the insides of the two cylindrical portions 40 and 44 communicate with each other via the opening 42, and a first portion is formed in this portion. A bevel gear 86A and a bearing for supporting the bevel gear 86A can be accommodated. A plurality of bolt insertion holes 43 are provided in the flange portion 41.

The first and second bearing holders 2A,
2B and the holding cover 4 are fixedly attached to the housing 1 so as to sandwich the housing 1 from both sides thereof. More specifically, the first bearing holder 2 </ b> A and the holding cover 4 are
a, and the second bearing holder 2B is arranged to face the other side surface 10b of the housing 1. Further, these bolt insertion holes 23A, 23B, 4
A series of bolts 76 are inserted through bolt insertion holes 17 penetrated in the width direction of the housing 3 and the housing 1, and the housing 1 is tightened by tightening the bolts 76 and nuts 76 a screwed thereto. Are fixed to them. Of course, as clearly shown in FIG. 2, the plurality of bolts 76 are arranged at positions avoiding the space chamber 11 of the housing 1 so as not to hinder the rotation operation of the rotating body 6 and the like. However, the present invention is not limited to this, and the above members may be attached to the housing 1 by using bolts of a type different from a so-called through bolt.

Preferably, each of the first bearing holder 2A and the holding cover 4 and the housing 1
Means that positioning and fixing are achieved by a plurality of knock pins (not shown). Similarly, the positioning and fixing of the second bearing holder 2B with respect to the housing 1 is achieved by using a plurality of knock pins. If the knock pins are used in this way, accurate positioning of the components can be achieved at a stage before the components are fixed by using the bolts 76.
The mounting strength of each of the above members to the housing 1 can be further increased.

As best shown in FIG. 3, the second bearing holder 2B has a stepped portion 22B fitted into the second opening 11b of the housing 1 and a flange portion 2B.
1B is attached to the housing 1 such that the outer peripheral edge thereof contacts the side surface 10b of the housing 1. The entire second opening 11b of the housing 1 is closed by the second bearing holder 2B. The first bearing holder 2A is attached to the housing 1 such that the outer peripheral edge of the flange portion 21A contacts the side surface 10a of the housing 1. Substantially the entire first opening 11a of the housing 1 is closed by the first bearing holder 2A. In addition, the hit body 65 is provided on each of the flange portions 21 of the first and second bearing holders 2A and 2B.
A, 21B, each flange portion 21A, 2B
1B also plays a role of restricting the movement of the hitting body 65 in the longitudinal direction.

The cylindrical portion 40 of the holding cover 4 has a first shape.
Of the bearing holder 2A of the first bearing holder 2A.
A is attached to the housing 1 such that the flange portion 21A of A is sandwiched between the flange portion 21A and the side surface 10a of the housing 1. The periphery of the second bevel gear 86B is covered by the cylindrical portion 40 of the holding cover 4. A first bevel gear 86 </ b> A is arranged in the opening 42 of the tubular portion 40 of the holding cover 4.

The third bearing holder 2C is fixedly attached to the cylindrical portion 40 using a plurality of bolts 76b so as to close one axial opening of the cylindrical portion 40 of the holding cover 4 in the axial direction. I have. This third bearing holder 2C
Also has a step 22C fitted into the cylindrical portion 40.

Inside the housing 1, lubrication of the needle bearings 75 A to 75 C for supporting the rotation of the rotating body 6, and the shank 3 of the striker 3 in the holder 15 are provided.
4, lubrication for axial vibration sliding, lubrication at a contact portion between the top surface 30 of the shank portion 34 and the hitting body 65, and a protrusion 72
An appropriate amount of lubricant for lubricating the contact portion between the top surface 72a of the striking body 65 and the striking body 65 and slidingly lubricating the striking body 65 against the inner peripheral surface of the hole 61 of the rotating body 6 is supplied.

Next, the operation of the continuous impact working machine A having the above configuration will be described.

The continuous impact working machine A is used in such a manner that the tip of the shovel-shaped striking work body 3 comes into contact with the ground on which a hole is to be dug. As a result, as shown in FIG. 3, the first shank portion 34 of the striker 3
The part 34a and the second part 34b will be located at the uppermost end of their reciprocating movement. In this state, when the rotation speed of the engine 8 is gradually increased by operating the throttle operation lever 81, the centrifugal clutch is actuated, and the rotation output of the engine is transmitted to the rotating body 6 via the transmission shaft 85. 6 starts high-speed rotation. This rotating body 6
With the rotation of, the hit body 65 collides with the top surface 30 of the first portion 34a of the shank portion 34 each time it rotates.
For this reason, a downward force is repeatedly applied to the shank portion 34, and the tip of the striker 3 advances toward the ground by the action of this force, thereby facilitating excavation work on the ground.

In the normal state where the hitting body 65 is turning while interfering with the top surface 30 of the shank portion 34, the projection 7
2 is at a position where it does not interfere with the striker 65. However, when the worker attempts to lift the housing 1 of the hitting mechanism B upward in order to pull out the hitting working body 3 pierced from the ground, for example, the convex portion 72 descends relative to the housing 1, and A hit body 65 is provided on the top surface 72a.
Can collide. When the striking body 65 collides with the top surface 72a, the convex portion 72 and the connecting member 71 are pushed upward, so that each slide rod 70, the third holder 15c, and the striking body 3 also move upward. Pushing force acts. Therefore, the operation of pulling out the striker 3 from the ground is facilitated. At this time, the top surface 30 of the shank portion 34 does not interfere with the hit body 65.

As described above, the striking body 65 collides with the top surface 30 of the striking work body 3 and applies an impact force to the top surface 30. Further, the hit body 65 may collide with the top surface 72a of the projection 72 in some cases. Therefore, the impact force as a reaction of the impact force is reduced by the three needle bearings 75A to 75A.
75C. On the other hand, each of the needle bearings 75A to 75C has a pair of shaft portions 60.
Since a plurality of needles having a fixed length in the axial direction of the shaft portions 60a and 60b are provided, a pair of shaft portions 60a and 60b are provided.
And the three needle bearings 75 </ b> A to 75 </ b> C are less likely to be twisted, and the three needle bearings 75 </ b> A to 75 </ b> C can appropriately distribute and bear the above-described impact force. That is, by preventing the pair of shaft portions 60a and 60b from being twisted, the impact force does not concentrate on only a part of the three needle bearings 75A to 75C. Therefore, the needle bearing 7
5A-75C may not be easily damaged.

The three needle bearings 75A to 75C are held by the cylindrical portions 20A to 20C of the first to third bearing holders 2A to 2C made of a member harder than the housing 1. Therefore, 3
Even if the radial impact force repeatedly acts on each of the three needle bearings 75A to 75C, the cylindrical portions 20A to 20C do not easily deform due to the impact force. Needle bearings 75A to 75C can be appropriately held in these tubular portions 20A to 20C so that rattling does not occur.

Further, the above-described impact force acts on the mounting portion between the first and second bearing holders 2A and 2B and the housing 1 and also on the mounting portion between the third bearing holder 2C and the holding cover 4. Works. On the other hand, the first and second bearing holders 2A, 2A
Each of the flange portions 21A and 21B of B
6, the mounting strength is increased. In particular, with respect to the first bearing holder 2A, the movement in the radial direction is also restricted by the fact that the tubular portion 20A is fitted to the tubular portion 40 of the holding cover 4. The movement of the second bearing holder 2B in the radial direction is also restricted by the step 22B fitted in the second opening 11b of the housing 1. Therefore, the first and second bearing holders 2A and 2B do not easily rattle in the radial direction.

Similarly, the third bearing holder 2C is
The movement in the radial direction is restricted by being attached to the holding cover 4 using a plurality of bolts 76b and the step 22C being fitted to the cylindrical portion 40 of the holding cover 4. Therefore, each of the first to third bearing holders 2A to 2C can be appropriately fixed for a long time. As a result, smooth rotation of the rotating body 6 is ensured, and the service life of the continuous impact working machine A can be extended.

In this continuous impact working machine A,
Opening 42 provided on the peripheral surface of cylindrical portion 40 of holding cover 4
Since the first bevel gear 86A is disposed inside the first bevel gear 86A, the center of the first bevel gear 86A can approach the center of the second bevel gear 86B. For this reason, when transmitting a rotational force from the first bevel gear 86A to the second bevel gear 86B with a predetermined reduction ratio, these two bevel gears 86A, 86A,
86B can be reduced in diameter. Therefore, it is also possible to reduce the size of the holding cover 4 that accommodates these bevel gears 86A and 86B. Also, if the first bevel gear 86A can be reduced in diameter, the transmission shaft 85
The distance S between the center line C1 and the center line C2 in the width direction of the housing 1 can also be shortened. On the other hand, while the impact force for causing the striker 3 to perform the reciprocating action acts along the center line C2, the striker B is supported on the engine 8 via the operation pipe 84. And its center coincides with the center line C1 described above. Therefore, if the distance S between the two center lines C1 and C2 is reduced, the center line C
2 can be prevented from acting as a large moment on the center line C1. When the moment is large, it is necessary to form the housing 1 and other parts of the other members thick so as to cope with the moment, and a heavy load is imposed on both arms of the operator who operates the continuous impact working machine A. However, in the present embodiment, such a problem can be solved or suppressed by reducing the moment. Further, by shortening the distance S, the overall thickness of the hitting mechanism B can be reduced.

The specific structure of each part of the continuous impact working machine according to the present invention is not limited to the above-described embodiment, and can be variously changed in design.

For example, in the present invention, a part of a plurality of bearings for supporting a pair of shafts of a rotating body is held by a housing or a bearing holder made of a material similar to that of the housing, and only the remaining bearings are more than the housing. It may be configured to be held by a hard bearing holder. However, as in the above-described embodiment, a pair of shafts of the rotating body are supported by a total of three bearings, and one of the pair of shafts is supported by two bearings to receive a rotational driving force from the outside. In such a case, since the load acting on the central bearing among them tends to be large, it is preferable to hold at least the central bearing by a bearing holder that is harder than the housing. Further, in the present invention, a pair of shaft portions is formed by using only two bearings without using a third bearing holder or a bearing held by the third bearing holder as a means for supporting the pair of shaft portions of the rotating body. A supported configuration is also possible.

In the present invention, the specific materials of the bearing holder and the housing are not particularly limited. In short, the bearing holder may be any material that is harder than the housing.

In the present invention, the driving source for driving the rotating body to rotate is not limited. The specific configuration of the striker is not limited to a shovel. In the present invention, the striker may be formed, for example, like a chisel of a concrete breaker. Alternatively, when the continuous impact working machine is used as a pile driving machine, the striking working body may have a form in which a lower open cap for fitting the top of a wooden pile is connected to the lower end of the shank portion. Further, for example, in the case of a rust remover for removing shells, dirt, rust, etc. attached to the outer wall of the hull, the tip end of the striker has a spatula shape. Furthermore, in the present invention, for example, a working machine for a high place (for example, a working machine equipped with a cutting hitting body for dropping and collecting palm fruit from a palm tree, or a hitting machine for cutting a tree branch) In this case, the operating tube 84 supporting the housing may have a size of, for example, about several meters or longer.

Further, in the above-described embodiment, since the striking work body 3 is formed in the form of a shovel that cannot be rotated around the axis, the shank portion of the striking work body 3 can be pivoted. The shank portion is implemented in the case where the work piece is formed into a chisel of a concrete breaker, for example, which is divided into the first portion and the second portion which cannot rotate. It is not necessary to divide into two as in the form. Further, in the present invention, a mechanism including a connecting member 71 having a convex portion 72 for retreating the hitting work body 3 upward, a pair of slide rods 70, and the like may be provided as necessary. It is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a continuous impact working machine according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an exploded sectional view showing a main member of the structure shown in FIG.

FIG. 5 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 Reference Signs List A Continuous impact working machine B Striking mechanism 1 Housing 2A First bearing holder 2B Second bearing holder 2C Third bearing holder 3 Striking working body 4 Holding cover 6 Rotating body 11a First opening 11b Second opening Part 20A Tubular part (of first bearing holder) 20B Tubular part (of second bearing holder) 20C Tubular part (of third bearing holder) 21A Flange part (of first bearing holder) 21B Flange Part (of the second bearing holder) 21C Flange part (of the third bearing holder) 22B, 22C Step part 40 Cylindrical part (of the holding cover) 41 Flange part (of the holding cover) 42 Opening part 65 Hit body 75A, 75B, 75C Needle bearing 86A First bevel gear 86B Second bevel gear

Claims (8)

[Claims] 1. A housing, a rotating body that rotates in the housing and has a pair of shafts, a plurality of bearings that support the pair of shafts, and this rotation that is eccentric from the center of rotation of the rotating body. The hitting body held by the body and the housing are supported so as to be able to reciprocate,
And a hitting working body that is pushed by contact with the hitting body when the hitting body turns with the rotation of the rotating body. At least one or more bearing holders made of a hard material are provided, and the bearing holder is connected to a cylindrical portion in which any of the plurality of bearings is mounted, and an outer peripheral surface of the cylindrical portion, and A continuous impact working machine, comprising: a flange portion to be attached to the housing. 2. The continuous impact working machine according to claim 1, wherein each of the bearings is a needle bearing. 3. A first shaft portion of the pair of shaft portions of the rotating body is configured to receive a rotational driving force from the outside of the housing, and the first shaft portion serves as the bearing holder. 3. The continuous impact working machine according to claim 1, further comprising a first bearing holder that holds a bearing of the shaft portion. 4. A holding cover having a tubular portion and a flange portion connected to the tubular portion, wherein the holding cover has a tubular portion of the first bearing. Along with fitting to the cylindrical part of the holder,
The continuous impact working machine according to claim 3, wherein the flange portion of the holding cover is attached to the housing so as to sandwich the flange portion of the first bearing holder between the flange portion and the housing. . 5. The first shaft portion protrudes outward in the width direction of the housing from the cylindrical portion of the first bearing holder, and the protruding portion is provided from outside of the housing. A second gear meshing with the first gear for transmitting a rotational driving force for rotating the rotating body is attached so as to be disposed in the cylindrical portion of the holding cover; and the holding cover is provided. 5. An opening for disposing the first gear is provided on a peripheral surface of the cylindrical portion of (4).
2. A continuous impact working machine according to item 1. 6. The bearing holder further includes a second bearing holder for holding a bearing of a second shaft portion of the pair of shaft portions of the rotating body. The bearing holder is attached to the housing so as to cover an opening provided on one side in the width direction of the housing, and has a stepped portion that fits into the opening. 5. The continuous impact working machine according to any one of 5. 7. The rotating body is provided with a hole through which the hitting body is inserted, and the hitting body is provided with:
7. The continuous impact working machine according to claim 6, wherein the continuous impact working machine is sandwiched between respective flange portions of the first and second bearing holders in a penetrating direction of the hole. 8. The vehicle according to claim 1, further comprising a third bearing holder made of a member harder than the housing, and the third bearing holder supporting the protruding portion of the first shaft portion. And a flange connected to the outer peripheral surface of the cylindrical portion and being fixed to the holding cover, and having a flange portion, The continuous impact working machine according to claim 5, wherein a step portion that fits with the tubular portion of the holding cover is provided.