JP2006264099A - Concrete cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a structure which is attached to the chassis of an engine which is attched easily to the chassis and does not need to form a long hole in the chassis. <P>SOLUTION: In a concrete cutter, the engine 1 is fixed to an engine mounting plate 2, a mounting hole 10 made the long hole in the fore-and-aft direction of the chassis 7 is formed in an engine fixing plate, and the engine fixing plate is fixed to the chassis by a bolt inserted into the mounting hole 10. A notch part 5 is formed in the front edge or rear edge of the engine fixing plate. It is preferable to facilitate the tension adjustment of a belt 6 for conducting the output of the engine. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure and method for fixing an engine and a water tank to a chassis in a concrete cutter.

  Conventionally, as a structure to fix the engine to the chassis of the concrete cutter, a structure in which a long hole is machined in the chassis and the engine is mounted directly, an engine base mounting stay is provided in the chassis, and the front and rear of the box-shaped engine base are bolted horizontally. A fixed structure is adopted.

The concrete cutter has a structure in which the output of the engine is transmitted to the rotary cutter by a belt. Since the belt gradually extends, the distance between the output shaft of the engine and the rotation shaft of the cutter needs to be adjustable in order to maintain an appropriate tension.
In the former mounting method, the tension of the belt can be adjusted by making the chassis movable in the front-rear direction by providing a long hole in the chassis.
In the latter mounting method, the tension of the belt can be adjusted by tilting the engine base around the rear mounting bolt and lifting the front of the engine base.

In the above patent document, the engine is directly attached to the main frame (chassis in the present application) of the concrete cutter.

  Conventionally, the water tank is fixed to the chassis by welding multiple (usually 4) fixing brackets to the tank house of the water tank and fixing them to the chassis with bolts. And a structure that is bolted to both sides of the chassis is adopted.

The disadvantages of the prior art are as follows.
The structure for directly attaching the engine to the chassis has the following problems. The inventions according to claims 1 to 3 are intended to solve these problems.
1) The mounting feet to the chassis of the engine are set to the minimum size due to the compact design of the manufacturer, and the assemblability is very bad, such as the bolts being difficult to pass through and tools being difficult to enter.
2) Slots must be machined in the chassis in order to stretch the belt, and the difficulty of chassis machining increases. This increases man-hours and increases costs due to machining defects.
The structure using the engine stand has the following problems.
1) The engine base mounting stay and the engine base itself are extra parts.
2) The mounting position of the engine as a whole is increased by the engine base mounting stay and the engine base, and the center of gravity position of the concrete cutter as a whole is increased, so that the stability is lowered.

In the structure in which the fixing metal is welded to the tank house when the water tank is attached, the engine vibration is transmitted to the tank house without being attenuated from the welded portion of the fixing metal, so that the tank house is likely to be in a resonance state.
In the structure in which the tank house is directly bolted, in a normal assembly, the tank house, which is a relatively heavy part, is fixed in the horizontal direction in a state of being suspended in the air, so that the assemblability is poor.
The inventions of claims 4 and 5 are intended to solve these problems.

According to a first aspect of the present invention, an engine is fixed to an engine mounting plate, a mounting hole that is a long hole in the front-rear direction of the chassis is provided in the engine fixing plate, and the engine fixing plate is attached to the chassis by a bolt inserted into the mounting hole. It is a concrete cutter characterized by being fixed to. The engine mounting plate is preferably provided with a notch on either the front edge or the rear edge so that the tension of the belt for transmitting the engine output can be easily adjusted.
The invention of claim 3 relates to an engine mounting step, wherein the engine is fixed to an engine fixing plate having a notch on either the front edge or the rear edge with a bolt, and then the engine fixing plate is attached to the chassis. It is an engine fixing method in a concrete cutter, characterized in that it is fixed to a chassis with a bolt inserted through a mounting hole formed as a long hole in the front-rear direction.

Claims 4 and 5 are obtained by adding a water tank mounting structure to each of the above-mentioned inventions. Claim 4 is a structure in which a water tank is mounted on a chassis, and an L-shaped lower part of the tank house of the water tank. A fixing bracket is provided, and a horizontal portion and a rising portion of the fixing bracket are concrete cutters fixed to the chassis and the tank house by bolts, respectively.
The tank house fixing bracket is preferably L-shaped in cross section, provided with a notch at the center of the rising portion, and the pitch of the bolt insertion holes on both sides of the horizontal portion is smaller than the pitch of the bolt insertion holes on both sides of the rising portion. (Claim 5).

In the first to third aspects of the invention, since the engine mounting plate is provided with a long hole for enabling the engine to move back and forth, it is not necessary to process the long hole in the chassis. Therefore, it is not necessary to perform a highly difficult operation of machining a long hole in the chassis, and productivity is improved.
In addition, since the mounting plate can be mounted on the chassis after the engine is mounted on the mounting plate (Claim 3), the problem that the bolt is difficult to pass or the tool is difficult to enter in the mounting operation of the engine is solved. Workability is improved.
As described above, all the conventional problems are solved.

In this invention, the position of the engine is adjusted by pushing the mounting plate backward by means of a belt tension adjusting bolt attached to the front of the chassis. When the belt is new, the distance between the output shaft of the engine and the rotating shaft of the cutter is adjusted to be short, and the position of the mounting plate is gradually moved backward in order to increase the distance between the two as the belt extends.
When using a mounting plate that does not have a notch, the limit of the distance that the mounting plate can be moved backward is determined by the length of the belt tension adjusting bolt. However, if a mounting plate with a notch is used, when the belt is new, the notch on the mounting plate faces the belt tension adjustment bolt, and when the belt is extended, the side without the notch on the mounting plate A wide range of movement is possible by facing the adjustment bolt.

  According to the fourth and fifth aspects of the present invention, since the fixing bracket is fixed to the tank house by the bolt, the vibration is absorbed by the bolt unlike the case of welding. As a result, resonance hardly occurs. According to the sixth aspect of the present invention, since the bolt spacing is different between the tank house mounting side and the chassis mounting side, twisting occurs in the vibration direction of the engine and the vibration direction of the tank house, and resonance is less likely to occur.

The engine 1 is placed on the engine mounting plate 2, and the engine 1 is fixed to the engine mounting plate 2 with bolts 4 inserted through mounting holes 3 formed in the engine mounting plate 2 from the back side of the engine mounting plate 2. The engine mounting plate 2 may be welded to the upper surface of the mounting plate 2 without providing the mounting hole 3.
The engine mounting plate 3 is a substantially rectangular plate, and a notch portion 5 is formed on one short edge (positioned forward or rearward when mounted on the chassis). When the belt 6 spanned between the output shaft of the engine and the rotating shaft of the cutter is new, the notch 5 is in front of the chassis, and when the belt 6 is old, the notch The orientation of the engine and the mounting plate is set so that 5 is behind the chassis.
Next, the engine mounting plate 3 to which the engine 1 is mounted is fixed to the chassis 7 with bolts 8 through mounting holes 10 formed at the corners. The mounting hole 10 is a long hole extending in the front-rear direction of the chassis 7 so that the engine mounting plate 2 can move in the front-rear direction on the chassis 7. The chassis 7 is provided with a female screw hole for fixing a bolt so that it can be fixed without using a nut. The female screw hole is provided at a position where a space where the tool can be used easily is secured. Note that the bolt 8 may be welded to the chassis 7, and in that case, the female screw hole is unnecessary.

  A belt tension adjusting bolt 9 is attached to the front portion of the chassis 7 so as to face the mounting plate 3. The belt tension adjusting bolt 9 is screwed into a female screw formed on a mounting portion rising from the chassis 7, and the belt tension adjusting bolt is rotated to push the mounting plate 3 backward at the tip of the belt tension adjusting bolt 9. The position can be moved. As described above, the tension of the belt 6 can be increased by moving the position of the engine 1 backward.

A tank house 11 in which a water tank is stored is mounted on the rear portion of the chassis 7. Fixing fittings 12 are arranged on both sides of the tank house 11, and the tank house 11 and the fixing fitting 12, and the fixing fitting 12 and the chassis 7 are connected by bolts that pass through the fixing fitting 12.
The fixing bracket 12 has an L-shaped cross section, and the rising portion 12a is formed with a large cutout portion 13 at the center. Bolt insertion holes 14 are formed on both sides of the rising portion 12a, and bolt insertion holes 15 are formed on both sides of the horizontal portion 12b and slightly closer to the center. That is, the interval between the two bolt insertion holes 15 in the horizontal portion is narrower than the interval between the two bolt insertion holes 14 in the rising portion, and the former is about twice the latter.

According to the above, the engine can be fixed to the engine mounting plate in a state where there is no obstacle to the work in mounting the engine, and the position of the mounting hole to the chassis in the engine mounting plate can be arbitrarily set. The work becomes easy and reliable, and the engine fixing strength is stable. Further, since it is not necessary to provide a long hole in the chassis, the number of processing steps of the chassis is reduced, and productivity is improved. In addition, a long hole is formed in the mounting plate, and adjusting the tension by moving the mounting plate with the belt tension adjusting bolt makes it very easy to adjust the belt tension. In addition, a notch is provided in the mounting hole. Thereby, the adjustment range of the distance between the output shaft of the engine and the rotation shaft of the cutter is expanded, and the allowable range of the belt length is expanded.
Further, the center of gravity does not increase as in the method using the engine stand.

According to the above method for fixing the tank house of the water tank, since the tank house side and the chassis side are bolt-fixed, the vibration of the engine is absorbed by the bolt part, so that the resonance between the chassis and the tank house hardly occurs. Furthermore, the fixing bracket has a notch at the rising part, and the interval between the fixing bolts is also different on the tank house side and the chassis side. Hard to occur.
In addition, there is no need to weld the fixture to the tank house, and the assembly process is simplified.

  The present invention has industrial applicability, such as simplifying an engine mounting process in a concrete cutter and facilitating belt adjustment.

Side view of the embodiment of the present invention Similarly, perspective view of the engine mounting plate Similarly, a plan view showing the relationship between the engine mounting plate and the belt tension adjustment bolt Similarly, a plan view showing the relationship between the engine mounting plate and the belt tension adjusting bolt when the engine mounting plate is reversed. The perspective view of the tank house fixing bracket of an Example

Explanation of symbols

1. Engine 2. 2. Engine mounting plate Mounting hole 4. Bolt 5. Notch 6. Belt 7. Chassis 8. Bolt 9. Belt tension adjusting bolt 10. Mounting hole 11. Tank house12. Fixing bracket 12a. Rising part 12b. Horizontal part 13 Notch part 14 Bolt insertion hole 15 Bolt insertion hole

Claims (5)

The engine is fixed to the engine mounting plate, the engine fixing plate is provided with a mounting hole which is a long hole in the front-rear direction of the chassis, and the engine fixing plate is fixed to the chassis by a bolt inserted into the mounting hole. Concrete cutter The concrete cutter according to claim 1, wherein a notch portion is provided on either the front edge or the rear edge of the engine mounting plate so that the tension of the belt for engine output conduction can be easily adjusted. A bolt for fixing the engine to an engine fixing plate having a notch on either the front edge or the rear edge, and then inserting the engine fixing plate into a mounting hole formed as a long hole in the front-rear direction of the chassis Fixing method to a chassis with a concrete cutter A water tank is mounted on the chassis, an L-shaped fixing bracket is disposed at a lower portion of the tank house of the water tank, and a horizontal portion and a rising portion of the fixing bracket are fixed to the chassis and the tank house by bolts, respectively. Item 10. A concrete cutter according to Item 1. 5. The tank housing fixing bracket is L-shaped in cross section, and is provided with a notch at the center of the rising portion, and the pitch of the bolt insertion holes on both sides of the horizontal portion is smaller than the pitch of the bolt insertion holes on both sides of the rising portion. Concrete cutter

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