JP5511065B2 - Ranma - Google Patents

Description

  The present invention relates to a rammer having an outer cylinder and an inner cylinder and a tubular protector surrounding them.

  Ranma is disclosed in Patent Document 1. In the rammer described in Patent Document 1, the lower end of the inner cylinder has a flange shape, which is directly joined to a substantially cylindrical lower protective member called a protective sleeve by a bolt. In general, the inner cylinder and the lower protective member are also subjected to a welding process in addition to bolting. This joint structure is the same for the outer cylinder and the upper protective member.

  In order to realize the above structure, it is necessary to provide bolt holes in the outer cylinder and the inner cylinder in order to join the upper and lower protection members, and therefore it is necessary to provide flange shapes in the outer cylinder and the inner cylinder. Therefore, the outer cylinder and the inner cylinder are formed by integral molding by casting. Alternatively, the flange part is integrally pressed against the outer cylinder and the inner cylinder. Generally, the outer cylinder is a casting, and the inner cylinder is formed with a flange by friction welding.

JP 2000-257018 A

  However, it takes time and cost to mold the outer cylinder and the inner cylinder by casting. Moreover, in order to press-fit the flange parts, a process for that purpose is required, and the number of parts is large and the handling is poor.

  The present invention has been made in consideration of the above prior art, and an object of the present invention is to provide a rammer capable of efficiently and simply coupling the upper and lower protective members to the outer cylinder and the inner cylinder and further reducing the cost.

In order to achieve the above object, the invention of claim 1 includes a telescopic outer cylinder and an inner cylinder that transmit vibration to the leveling shoe, and the outer cylinder and the inner cylinder are surrounded by a telescopic tube as a protector. are one, the rammer coupled respectively to the end and upper and lower ends of the tube, the lower portion of the pipe the lower end the inner tube to be coupled to of the expanded processing Ru is enlarged outwardly facilities The lower end portion of the tube is formed as a lower enlarged diameter portion, while the lower end portion of the tube extends upward from the lower end of the tube, and the lower end portion is formed into an integral double tube structure. A rammer having a folded portion to be configured, wherein the lower diameter enlarged portion of the inner cylinder is press-fitted into the folded portion of the pipe, thereby being coupled to the lower end portion of the pipe. I will provide a.

While the invention of claim 2, in the invention of claim 1, the upper portion of the outer tube to be coupled to the tube that is formed as an upper enlarged diameter portion diameter processing Ru is enlarged outwardly is applied, the upper enlarged diameter portion of the outer cylinder is in Rukoto is press-fitted into the upper end of the tube, is characterized by being coupled to the upper end of the tube.
In the invention of claim 3, in the invention of claim 1 or 2, when the upper enlarged portion or press-fitting of the lower enlarged diameter portion with respect to the tube, the outer diameter of the upper enlarged diameter portion or the lower enlarged diameter portion The outer periphery of the upper enlarged portion or the lower enlarged portion is turned so as to be within the range of the press fit tolerance.

According to a fourth aspect of the present invention, in the first to third aspects of the invention, the diameter expansion process is performed using bulging.
According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the inner cylinder is not interposed in a bolt connection portion between the leveling shoe and the pipe.

According to the invention of claim 1, the double pipe structure in which the lower portion of the inner cylinder is formed as a lower enlarged portion in advance and the lower end portion of the tube as the protector is formed by the folded portion inside. And the lower diameter enlarged portion of the inner cylinder is press-fitted into the folded portion of the double tube structure . Therefore, both are reliably combined . For this reason, it is not necessary to provide a flange with a bolt hole formed in the inner cylinder in order to connect the inner cylinder and the pipe, so that the work efficiency is improved, further simplification, the number of parts is reduced, and the cost is reduced. It is done.

According to the second aspect of the present invention, the upper portion of the outer cylinder is also formed as the upper enlarged portion, and this upper enlarged portion is press-fitted into the upper end of the pipe, so that it is not necessary to provide a flange on the outer cylinder. Further, the work efficiency can be further improved, further simplified, the number of parts can be reduced, and the cost can be reduced.
According to the invention of claim 3, after the diameter expansion process, the outer periphery of the lower diameter expansion part or the upper diameter expansion part is turned, and the outer diameter of the lower diameter expansion part or the upper diameter expansion part is set to the press-fitting tolerance. Since it is within the range, the efficiency and workability when the lower diameter expanded portion or the upper diameter expanded portion is press-fitted into the pipe can be improved.

According to the invention of claim 4, since the diameter expansion process is performed by bulge processing, the diameter expansion process of the outer cylinder or the inner cylinder can be performed efficiently and simply. Therefore, workability is improved.
According to the fifth aspect of the present invention, since the lower portion of the inner cylinder is press-fitted into the folded portion of the pipe, both are joined, so that the leveling shoe and the inner cylinder can be directly connected by connecting only the leveling shoe and the pipe. Connection with can also be realized. Therefore, it becomes unnecessary to perform processing for connecting with the leveling shoe in the future on the inner cylinder, and the manufacturing efficiency is improved.

It is a schematic external view of the rammer according to the present invention. It is AA sectional drawing of FIG. It is a schematic sectional drawing which shows the coupling | bonding state of an inner cylinder and a lower protection member. It is a schematic sectional drawing which shows the coupling | bonding state of an outer cylinder and an upper protection member.

  As shown in FIG. 1, a rammer 1 according to the present invention includes an engine 2 as a power source, a rammer head 3, a tube 4 as a protector, and a leveling shoe 5. The engine 2 is supplied with fuel from a fuel tank 6 and is driven to rotate on an output shaft 7 (see FIG. 2). The rotation movement of the output shaft is converted into the vibration movement of the piston rod 8 (see FIG. 2) by the rammer head 3. The piston rod 8 vibrates in the pipe 4 and moves the leveling shoe 5 up and down. As a result, the ground leveling shoe 5 strikes and compacts the ground.

  More specifically, as shown in FIG. 2, the power from the engine 2 is transmitted to the output shaft 7 in the rammer head 3 to rotate the output shaft 7. A pinion gear (not shown) provided on the output shaft 7 and the crank gear 9 are engaged with each other, and the crank gear 9 also rotates as the output shaft rotates. A crankshaft 10 projects from the crank gear 9 at a position eccentric from the center of rotation. The crankshaft 10 is rotatably connected to the upper end of the connecting rod 11. The lower end of the connecting rod 11 is connected to the joint 13 via the joint pin 12. The joint 13 is fixed to the upper end of the piston rod 8. Therefore, the rotational motion of the output shaft 7 is converted into a vibration motion by the connecting rod 11 and moves the piston rod 8 up and down.

A piston head 14 is provided at the lower end of the piston rod 8. The top and bottom of the piston head 1 4 spring 15 is disposed, respectively. These springs 15 are accommodated in the inner cylinder 16. The inner cylinder 16 can slide in the outer cylinder 17. That is, the outer cylinder 17 and the inner cylinder 16 are nested. The inner cylinder 16 and the outer cylinder 17 are surrounded by a tube 4 as a protector. The tube 4 includes an upper protective member 18, a lower protective member 19, and a telescopic bellows 20 that connects them. The bellows 20 is for holding the lower protective member 19 so as not to rotate. The upper portion of the outer cylinder 17 is fixed to the upper protection member 18. The lower part of the inner cylinder 16 is fixed to the lower protective member 19. That is, the outer cylinder 17 and the inner cylinder 16 are respectively coupled to the upper and lower ends of the pipe 4 . The upper protection member 18 is fixed to the rammer head 3 via bolts 21. The lower protective member 19 is fixed to the leveling shoe 5 via a bolt 22. Therefore, the vertical movement of the piston rod 8 is transmitted to the spring 15 and the rammer head 3 moves up and down. Following this, the tube 4 jumps up. The pipe 4 follows the reciprocating motion of the piston rod 8, and accordingly, the lower protective member 19 fixed to the outer cylinder 17 also moves up and down. And the leveling shoe 5 vibrates. The vertical movement of the lower protective member 19 absorbs the expansion and contraction of the bellows 20. Thereby, the pipe | tube 4 is protecting the inner cylinder 16 and the outer cylinder 17, expanding and contracting.

  The inner cylinder 16 and the lower protective member 19 are fixed as follows. First, a diameter expansion process for expanding the outer diameter of the inner cylinder 16 is performed. After the diameter expansion process, the inner cylinder 16 is press-fitted into the lower protective member 19. Specifically, the lower protective member 19 is slid along the inner cylinder 16 and is pushed in and fixed at the enlarged diameter portion. More specifically, as shown in FIG. 3, the lower protective member 19 has a folded portion 23 facing inward, and the inner cylinder 16 is press-fitted and fixed to the folded portion 23. Therefore, the part which expands the diameter of the inner cylinder 16 may be only one end part in contact with the folded part 23. By using such a cylindrical tube coupling method, as shown in FIG. 3, the inner cylinder 16 and the lower protective member 19 are securely fixed. Further, in order to connect the inner cylinder 16 to the lower protective member 19 and the leveling shoe 5 as in the prior art, it is not necessary to provide a flange having a bolt hole formed in the inner cylinder 16, and work efficiency can be improved. Further, the work is simplified, the number of parts is reduced, and the cost can be reduced. Also, the number of assembly steps can be greatly reduced.

  Further, as is apparent from the drawing, when the inner cylinder 16 and the lower protective member 19 are fixed, other parts such as screws are not used. This is because it is not necessary to connect the inner cylinder 16 directly to the leveling shoe 5 in order to transmit the sliding motion of the inner cylinder 16 to the leveling shoe 5, but if the lower protective member 19 and the leveling shoe 5 are directly connected. It is good. That is, by directly connecting only the leveling shoe 5 and the lower protective member 19 constituting the pipe 4, connection between the leveling shoe 5 and the inner cylinder 16 can also be realized. Therefore, it becomes unnecessary to perform processing for connecting with the leveling shoe 5 in the future on the inner cylinder 16, and the manufacturing efficiency is improved.

  Further, after the diameter expansion process, the outer periphery of the inner cylinder 16 may be turned. Thus, by turning the inner cylinder 16 and setting the outer diameter thereof, the outer diameter of the inner cylinder 16 can be within the range of the press-fitting tolerance. Thereby, the efficiency and workability | operativity at the time of press injection can be improved. Further, the diameter expansion process of the inner cylinder 16 is performed using bulge processing. Thereby, the diameter expansion process of the inner cylinder 16 can be performed efficiently and simply, and workability | operativity improves. The bulging process is performed by a known method. Specifically, by inserting a cylindrical member divided in the axial direction into the inner cylinder 16 and pushing a solid bar having a diameter larger than the inner diameter of the cylindrical member along the axis of the cylindrical member, the cylindrical member is The inner cylinder 16 is pushed outward to expand the diameter of the inner cylinder 16.

  The outer cylinder 17 can also be fixed to the upper protection member 18 in the same manner as the inner cylinder 16. The above effects can be obtained for both the outer cylinder 17 and the inner cylinder 16 by coupling the outer cylinder 17 and the inner cylinder 16 in the same manner. FIG. 4 shows the details of the outer tube 17 and the upper protective member 18 that are coupled using such a tube tube coupling method.

DESCRIPTION OF SYMBOLS 1 Ramma 2 Engine 3 Ramma head 4 Pipe 5 Leveling shoe 6 Fuel tank 7 Output shaft 8 Piston rod 9 Crank gear 10 Crank shaft 11 Connecting rod 12 Joint pin 13 Joint 14 Piston head 15 Spring 16 Inner cylinder 17 Outer cylinder 18 Upper protection member 19 Lower protective member 20 Bellows 21 Bolt 22 Bolt 23 Folded part

Claims (5)

It comprises an outer cylinder and the inner cylinder of the telescopic transmitting vibrations to the leveling shoe, while these outer cylinder and the inner cylinder is surrounded by a telescopic tube as protector, respectively end and upper and lower ends of the tube In the combined Ramma,
While the lower portion of the inner tube to be coupled to the lower end of the tube is formed as the lower enlarged diameter portion diameter processing Ru is enlarged outwardly is applied,
The lower end portion of the tube has a folded portion that extends upward from the lower end of the tube toward the inside of the tube and configures the lower end portion into an integral double tube structure,
The lower enlarged diameter portion of the inner cylinder is a Rukoto is press-fitted into the folded portion of the tube, characterized in that it is coupled to the lower end of the tube rammer. While the upper portion of the outer cylinder to be coupled to the tube that is formed as an upper enlarged diameter portion diameter processing Ru is enlarged outwardly is applied,
The upper enlarged diameter portion of the outer cylinder, rammer according to claim 1, in Rukoto is press-fitted into the upper end of the tube, characterized in that it is coupled to the upper end of the tube. Upon the upper enlarged portion or press-fitting of the lower enlarged diameter portion with respect to the tube, the upper enlarged diameter portion the outer diameter of the upper enlarged diameter portion or the lower enlarged diameter portion to within the range of the press tolerances or The runner according to claim 1 or 2, wherein an outer periphery of the lower enlarged portion is turned.   The reamer according to any one of claims 1 to 3, wherein the diameter expansion process is performed using bulge processing. The runner according to any one of claims 1 to 4, wherein the inner cylinder is not interposed in a bolt connection portion between the leveling shoe and the pipe.

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