JP2009103220A - Actuator device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine enabling easy change or replacement of a connection structure between a hydraulic cylinder and a mechanism. <P>SOLUTION: The construction machine 100 is provided with the hydraulic cylinder 104c. The hydraulic cylinder is provided with a cylinder body 110, a cylinder top boss 140 provided at an upper part of the cylinder body, and a cylinder bottom boss 150 provided at a bottom part of the cylinder body. At least one of the cylinder top boss and the cylinder bottom boss is detachably combined to the cylinder body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction machine including a hydraulic cylinder.

Conventionally, a common boom that is always attached to the swing frame of the upper swing body in order to make it possible to change the specifications of the front device according to the work contents in a short time and to improve the workability. A construction machine is known in which a excavation work subassembly corresponding to the work content is connected to the front end side of the machine in a replaceable manner (see, for example, Patent Document 1).
JP 11-193542 A

  By the way, in a construction machine including a hydraulic cylinder in which a mechanism for performing various operations is hydraulically operated, a hydraulic cylinder is generally rotatably coupled to the mechanism through a pin through a boss of the hydraulic cylinder. Since construction machines are generally used for many purposes, it is desirable that the coupling structure between the hydraulic cylinder and the mechanism be variable depending on the application. Further, since a large load is applied to the coupling structure between the boss of the hydraulic cylinder and the mechanism side, it is also desirable to increase the durability of the entire construction machine by replacing only the coupling structure.

  Accordingly, an object of the present invention is to provide a construction machine that can easily change or replace the coupling structure between the hydraulic cylinder and the mechanism.

To achieve the above object, the present invention is a construction machine including a hydraulic cylinder,
The hydraulic cylinder includes a cylinder body, a cylinder top boss provided at an upper portion of the cylinder body, and a cylinder bottom boss provided at a bottom portion of the cylinder body,
At least one of the cylinder top boss and the cylinder bottom boss is detachably coupled to the cylinder body.

  ADVANTAGE OF THE INVENTION According to this invention, the construction machine which can change or replace | exchange the coupling structure between a hydraulic cylinder and a mechanism easily is obtained.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram schematically showing an entire construction machine 100 according to an embodiment of the present invention. A construction machine 100 according to the present embodiment is a hydraulic excavator that is a traveling construction machine, and includes a lower traveling body 102, an upper revolving body 101 that is disposed on the upper side of the lower traveling body 102, and an upper revolving body. A mechanism 103a, 103b, 103c provided in 101 for performing various operations, and hydraulic cylinders 104a, 104b, 104c for operating the mechanisms 103a, 103b, 103c. Although not shown, the hydraulic pressure generated in the hydraulic cylinders 104a, 104b, 104c is generated by driving a hydraulic pump using the engine as a power source, and is controlled by a microcomputer and a hydraulic circuit.

  The mechanism 103a is a mechanism that rotatably supports the boom with respect to the upper swing body 101, and the position (movement) of the boom with respect to the upper swing body 101 is controlled by the hydraulic pressure of the hydraulic cylinder (boom cylinder) 104a. The mechanism 103b is a mechanism that rotatably supports the arm with respect to the boom, and the position (movement) of the arm with respect to the boom is controlled by the hydraulic pressure of the hydraulic cylinder (arm cylinder) 104b. The mechanism 103c is a mechanism that rotatably supports the bucket with respect to the arm, and the position (movement) of the bucket with respect to the arm is controlled by the hydraulic pressure of the hydraulic cylinder (bucket cylinder) 104c. Note that the mechanisms 103a, 103b, and 103c are not necessarily the above-described rotation mechanism, and may be an expansion / contraction mechanism (slide mechanism) or a combination mechanism thereof.

  FIG. 2 is a diagram illustrating details of an example of the hydraulic cylinder 104c as a representative of the hydraulic cylinders 104a, 104b, and 104c. In the following, the configuration of the hydraulic cylinder (bucket cylinder) 104c will be mainly described, but the configurations of the other hydraulic cylinders 104a and 104b may be the same.

  The hydraulic cylinder 104 c includes a cylinder body 110 including a cylinder tube 120 and a rod 130, a cylinder top boss 140 provided at an end portion of the rod 130, and a cylinder bottom boss 150 provided at an end portion of the cylinder tube 120.

  The cylinder top boss 140 is coupled to the end portion of the rod 130 as described later, and is coupled to the mechanism 103b via a pin 70 so as to be rotatable as shown in FIG. The cylinder bottom boss 150 is coupled to the end of the cylinder tube 120 as described later, and is coupled to the mechanism 103c by a pin 72 so as to be rotatable as shown in FIG.

  FIG. 3 is a diagram schematically showing an example of the characteristic configuration of the components of the hydraulic cylinder 104c.

  As shown in FIG. 3, the end portion of the rod 130 includes a screw portion 132 (hereinafter referred to as “rod screw portion 132”) in which a screw thread is formed on the outer peripheral surface. The cylinder top boss 140 includes a boss hole 142 through which the pin 70 (see FIG. 2) is inserted and a screw hole 144 into which the rod screw portion 132 is screwed. Boss hole 142 has a diameter corresponding to pin 70 (pin hole diameter). The cylinder top boss 140 is coupled to the rod 130 (and eventually the cylinder body 110) by the rod screw portion 132 of the rod 130 being screwed into the screw hole 144 of the cylinder top boss 140.

  As shown in FIG. 3, the end of the cylinder tube 120 includes a screw hole 122 (hereinafter referred to as “cylinder screw hole 122”) in which a thread groove is formed on the inner peripheral surface of the hole. The cylinder bottom boss 150 includes a boss hole 152 through which the pin 72 (see FIG. 2) is inserted, and a screw portion 154 having a thread formed on the outer peripheral surface. Boss hole 152 has a diameter (pin hole diameter) corresponding to pin 72. The cylinder bottom boss 150 is coupled to the cylinder tube 120 (and thus the cylinder main body 110) by screwing the screw portion 154 into the cylinder screw hole 122 of the cylinder tube 120.

  FIG. 4 is a diagram illustrating an example of a variation of the cylinder top boss 140. In the following, variations of the cylinder top boss 140 will be mainly described, but variations of the cylinder bottom boss 150 may be the same.

  A cylinder top boss 140A shown in FIG. 4A is a cylinder top boss corresponding to a standard specification (standard use), and has a boss hole 142A having a standard pin hole diameter (for example, φ100). The rod screw portion 132 of the rod 130 can be screwed into the screw hole 144A of the cylinder top boss 140A.

  On the other hand, a cylinder top boss 140B shown in FIG. 4B is a cylinder top boss corresponding to a large soil volume specification (large soil volume application), and a boss hole having a pin hole diameter (for example, φ120) larger than the standard specification. 142B. In the case of the large soil volume specification, the load applied to the pin 70 is large for handling the large soil volume, and it is necessary to increase the diameter of the pin 70 correspondingly and to increase the pin hole diameter accordingly. Because. Here, the screw hole 144B of the cylinder top boss 140B has the same configuration as the screw hole 144A of the cylinder top boss 140A. Therefore, the rod screw portion 132 of the rod 130 is screwed into the screw hole 144B of the cylinder top boss 140B. It is possible to wear.

  Therefore, when the cylinder top bosses 140A and 140B shown in FIGS. 4A and 4B are set, one of the cylinder top bosses 140A and 140B can be selectively coupled to the same cylinder body 110. . Thereby, the compatibility of the cylinder main body 110 is enhanced, and for example, the same cylinder main body 110 can be used for the standard specification and the large earth volume specification.

  FIG. 5 is a view showing another example of variations of the cylinder top boss 140. In the following, variations of the cylinder top boss 140 will be mainly described, but variations of the cylinder bottom boss 150 may be the same.

  The cylinder top boss 140C shown in FIG. 5 (B) is longer by ΔL along the axial direction of the rod 130 than the cylinder top boss 140A shown in FIG. 5 (A). The rod screw portion 132 of the rod 130 can be screwed into any of the screw holes 144 of the cylinder top boss 140C and the cylinder top boss 140A.

  Therefore, when the cylinder top bosses 140A and 140C shown in FIGS. 5A and 5B are set, one of the cylinder top bosses 140A and 140C can be selectively coupled to the same cylinder body 110. . Thereby, the compatibility of the cylinder main body 110 is enhanced, and the same cylinder main body 110 can be used in a place where hydraulic cylinders having different lengths are required.

  FIG. 6 is a view showing another example of variations of the cylinder top boss 140. FIG. 6 shows the cylinder top boss 140 as viewed in FIG. In the following, variations of the cylinder top boss 140 will be mainly described, but variations of the cylinder bottom boss 150 may be the same.

  A cylinder top boss 140D shown in FIG. 6B has a width W1 (length along the axial direction of the pin 70) larger than the width W0 of the cylinder top boss 140A shown in FIG. The rod screw portion 132 of the rod 130 can be screwed into any of the screw holes 144 of the cylinder top boss 140D and the cylinder top boss 140A.

  Therefore, when the cylinder top bosses 140A and 140D shown in FIGS. 6A and 6B are set, one of the cylinder top bosses 140A and 140D can be selectively coupled to the same cylinder body 110. . Thereby, the compatibility of the cylinder main body 110 is enhanced, and it is possible to use the same cylinder main body 110 at a place where hydraulic cylinders having different widths of the cylinder top boss 140 are required.

  In the above description, from the viewpoint of preventing the description from being complicated, only two types of the cylinder top boss 140 having different pin hole diameters, lengths, and widths are illustrated as variations of the cylinder top boss 140. There may be the above variations, and a large number of variations in which at least two of the pin hole diameter, length, and width of the cylinder top boss 140 are variously changed may be prepared.

  As described above, according to this embodiment, the following excellent effects can be obtained.

  First, according to the present embodiment, as described above, a plurality of cylinder top bosses 140 and cylinder bottom bosses 150 having different pin hole diameters, lengths and widths are selectively coupled to the same cylinder body 110. Compared to the conventional configuration in which a dedicated cylinder top boss and cylinder bottom boss are connected to the cylinder body by welding so as not to be removable, the versatility or compatibility of the cylinder body 110 of the hydraulic cylinder 104c (104a, 104b is also the same). Can be increased. As a result, for example, when the site (use) is different, the specification change of the construction machine 100 can be easily realized by replacing the cylinder top boss 140 and / or the cylinder bottom boss 150 according to the use.

  Further, according to this embodiment, as described above, a plurality of cylinder top bosses 140 and cylinder bottom bosses 150 having different pin hole diameters, lengths, and widths are selectively coupled to the same cylinder body 110. Therefore, compared to the conventional configuration in which the dedicated cylinder top boss and cylinder bottom boss are connected to the cylinder body by welding so as not to be removable, the inventory can be managed more efficiently. The durability of the hydraulic cylinder 104c can be increased by replacing only the cylinder top boss 140 and the cylinder bottom boss 150 of the cylinder 104c (the same applies to the 104a and 104b).

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, as a preferred embodiment, both the cylinder top boss 140 and the cylinder bottom boss 150 are configured to be detachable from the cylinder body 110. Only one of them may be configured to be removable.

  In the above-described embodiment, the rod screw portion 132 is set on the rod 130 side and the screw hole 144 is set on the cylinder top boss 140 side. Conversely, the screw hole is set on the rod 130 side, and the cylinder top is set. A screw portion may be set on the boss side. Similarly, in the above-described embodiment, the cylinder screw hole 122 is set on the cylinder tube 120 side and the screw portion 154 is set on the cylinder bottom boss 150 side. Conversely, the screw portion is set on the cylinder bottom boss 150 side. It may be set and a screw hole may be set on the cylinder bottom boss side.

  In the above-described embodiment, the construction machine 100 is a hydraulic excavator. However, the present invention can be applied to any type of construction machine including a bulldozer, a wheel loader, and a crawler loader.

It is a figure showing roughly the whole of one example of construction machine 100 by the present invention. It is a figure which shows the detail of an example of the hydraulic cylinder 104c. It is a figure which shows roughly an example of the characteristic structure of the component of the hydraulic cylinder 104c. FIG. 5 is a diagram showing an example of a variation of a cylinder top boss 140. It is a figure which shows another example of the variation of the cylinder top boss | hub 140. FIG. It is a figure which shows another example of the variation of the cylinder top boss | hub 140. FIG.

Explanation of symbols

70 pin 72 pin 100 construction machine 101 upper swing body 102 lower traveling body 103a, 103b, 103c mechanism 104a, 104b, 104c hydraulic cylinder 110 cylinder body 120 cylinder tube 122 cylinder screw hole 130 rod 132 rod rod part 140 cylinder top boss 142 boss hole 144 Screw hole 150 Cylinder bottom boss 152 Boss hole 154 Screw part

Claims (5)

A construction machine comprising a hydraulic cylinder,
The hydraulic cylinder includes a cylinder body, a cylinder top boss provided at an upper portion of the cylinder body, and a cylinder bottom boss provided at a bottom portion of the cylinder body,
A construction machine, wherein at least one of the cylinder top boss and the cylinder bottom boss is detachably coupled to the cylinder body.   The construction machine according to claim 1, wherein the cylinder top boss is coupled by being screwed to an end of a rod of the cylinder body.   The construction machine according to claim 1, wherein the cylinder bottom boss is coupled by screwing to an end of the cylinder body.   The construction machine according to claim 1 or 2, wherein the cylinder body is compatible with at least two or more cylinder top bosses having different pin hole diameters, lengths, and widths.   The construction machine according to claim 1 or 3, wherein the cylinder body is compatible with at least two or more cylinder bottom bosses having different pin hole diameters, lengths, and widths.

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