JPH0717852U - Ripper shank point coupling device - Google Patents

Abstract

(57) [Abstract] [Purpose] By increasing the contact surface of the fitting part with the ripper shank due to the load applied to the tip of the point, the surface pressure of the fitting part is suppressed, the occurrence of plastic flow cracks is prevented, and the point is made small. Make it lightweight. A point connecting device for a ripper shank in which a point 2 is externally fitted to the tip of a ripper shank 1 and fixed by a pin 3 penetrating the two points, in which a left and right outer side surfaces 1a of a connecting part of the ripper shank 1 with a point 2 , 1b is formed in an uneven shape, and each inner surface 2a on the hole side of the corresponding point 2 is formed.
2b is formed into an uneven shape that fits into the unevenness.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ripper for a rear working machine mounted on the rear part of a vehicle body of a bulldozer, and more particularly to a device for connecting a ripper shank and a point in the ripper.

[0002]

[Prior art]

 There are many mounting structures for the ripper shank and the points on the ripper, such as Japanese Utility Model Laid-Open No. 56-150259 and Japanese Utility Model Laid-Open No. 1-119450. Generally, as shown in FIG. 5, the tip of the ripper shank 11 is used. After the point 12 is fitted in, the mounting pin 13 is inserted between the two and fixed.

[0003]

[Problems to be solved by the device]

This will be described with reference to FIG. During the ripping work, as an example, an external force F1 acts on the tip of the point 12, and a load of F ₁ is applied to the shank 11, a load of F ₂ is applied to the tip, and a load of F ₃ is applied to the position P ₁ in contact with the end of the point 12. To work. When the dimension of the tip of the point 12 and the P ₁ portion is L, a bending moment of F ₁ L is generated in the P ₁ portion which is the fitting end portion of the shank 11 and the point 12, and bending deformation occurs. That is, bending deformation and high surface pressure due to F ₃ are simultaneously generated in the P ₁ portion. Since the magnitude of the external force F ₁ changes during the work, the magnitude of the bending moment of the P ₁ part changes, and as a result, the bending deformation amount also changes. As described above, at the time of actual work, the P ₁ portion repeats a slight bending deformation under the high surface pressure due to F _3, and as a result, a plastic flow crack is likely to occur.

As a countermeasure against this, in the conventional technique shown in FIG. 6, the dimension L ₁ of the fitting portion of the point 12 is increased to suppress the surface pressure of the P ₁ portion so that a plastic flow crack does not occur. However, the weight of points other than the effective wear portion of point 12 is increased, and the effective use rate of points (weight of tip effective wear portion / total weight of points) is low, which is uneconomical.

In view of this, the present invention suppresses the surface pressure of the fitting portion by increasing the area of the fitting contact portion between the point and the ripper shank, and the plastic flow can be achieved without increasing the fitting portion dimension L _1. The purpose of the present invention is to eliminate the drawbacks of the prior art by providing a connecting device for the points of the ripper shank that can prevent the occurrence of cracks.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a device for connecting points of a ripper shank in which a point is externally fitted to the tip of the ripper shank and is fixed by a pin penetrating both ends. It is characterized in that it is formed in a concavo-convex shape, and each inner surface on the hole side of the corresponding point is formed in a concavo-convex shape that fits into the concavo-convex shape.

[0007]

[Action]

 According to the above configuration, since the ripper shank and the point contact with each other by unevenness, the contact area of the fitting portion increases and the surface pressure of the contact surface decreases. Therefore, the occurrence of plastic flow cracks can be prevented.

[0008]

【Example】

 1 is a side view showing an embodiment of a device for joining a ripper shank and a point according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 1, and FIG. It is sectional drawing which shows an example.

The present invention will be described below with reference to the embodiments shown in FIGS. 1 to 4. The present invention relates to a point connecting device of a ripper shank in which a point 2 is externally fitted to the tip of a lipper shank 1 and fixed by a pin 3 penetrating the two points. 1a, 1b is formed in a concavo-convex shape, and each inner surface 2a, 2b on the hole side of the corresponding point 2 is formed in a concavo-convex shape that fits into the concavo-convex.

As shown in FIGS. 1 and 2, the tip of the ripper shank 1 is inserted into the fitting hole of the point 2 for excavation, and the pin 3 is moved from one outside of the point 2 to the other inside the ripper shank 1. It is designed to be integrated with point 2 by penetrating it. In this case, the cross section of the shank 1 and the point 2 is provided with unevenness on the upper and lower sides of the left and right side surfaces as shown in the cross section AA of FIG. 3, and the unevenness of the shank 1 and the point 2 are attached so as to fit each other. However, it is formed so that the height of the upper and lower surfaces becomes smaller as it gets closer to the tip.

FIG. 4 shows another embodiment, which is different from FIG. 3 in that a plurality of concaves and convexes are provided, but the effect obtained is the same as in the case of FIG.

Next, the operation will be described. In FIG. 1, the load that point 2 receives during excavation work is, for example, F ₁ at the tip of point 2 as in the case of FIG. 5, so that the load of F ₂ is applied to the tip of shank 1, While the contact surface corresponding to P ₁ part load F3 is applied, the contact portion of the point and the shank for receiving a load F3 as shown in FIG. 3 is a 1c section and 1d portion contact 1d portion compared with the conventional structure Since the area increases and the surface pressure decreases, the diagonally shaded portion 4 that is the fitting portion of the point 2 to the shank 1 that has been conventionally provided is cut to reduce the dimension corresponding to L ₁ in FIG. Since plastic flow cracks do not occur, the point weight can be reduced.

[0013]

[Effect of device]

 As described above, the present invention is a device for connecting points of a ripper shank in which a point is externally fitted to the tip of the ripper shank and is fixed by a pin penetrating both of them. Since the inner surface on the hole side of the corresponding point is formed to be uneven so as to fit into the unevenness, even if the fitting length of the point is shortened, the plasticity at the contact part of the ripper shank and the point The occurrence of flow cracks can be prevented, and the total weight of the points can be reduced. As a result, the effective usage rate of the points can be increased and the user cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a device for joining a ripper shank and a point according to the present invention.

FIG. 2 is a plan view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view showing another embodiment.

FIG. 5 is a side view showing attachment of a conventional ripper shank and a point.

FIG. 6 is an explanatory view showing an effective wear portion of a point.

[Explanation of symbols]

1,1 'Ripper shank 1a, 1b Outer side surface 1c, 1d Point and shank contact 2,2'
Point 2a, 2b Inner surface 3 pins

Claims (1)

[Scope of utility model registration request] 1. A point connecting device for a ripper shank in which a point is externally fitted to the tip of the ripper shank and is fixed by a pin penetrating the both points, wherein each of the left and right outer side surfaces of the point connecting portion of the ripper shank is formed in an uneven shape, A connecting device for a point of a ripper shank, wherein each inner surface of the corresponding point on the hole side is formed into an uneven shape that fits into the unevenness.