JPS587771B2 - land processing tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to land working tools, and more particularly to land working tools in which the tips of the teeth are held in a fit against a tip support, each of which has two mating contact surfaces. The present invention relates to a land working tool which is constituted by separate rotating surfaces and in which the two separate rotating surfaces have a common axis of rotation at or around the pin location.

In conventional land working tools in which the tooth tip support supports the tooth tip by wedge-shaped fitting, the socket of the tooth tip and the support portion of the tooth tip support have flat upper and lower surfaces.

In such land machining tools, when the tooth tip receives a lateral force in addition to an axial thrust on the tooth tip, the tooth tip will move against the tooth tip support within the range of the "backlash" of the fit. Rotate against.

In this case, the socket of the tooth tip and the support of the tooth tip support have only a very narrow partial contact surface, so that the wear of the tooth tip and the tooth tip support is significant and therefore has the disadvantage of a short service life. Was.

In order to overcome these shortcomings, the special public
Publication No. 8 proposes a land machining tool in which the contact surfaces of the tooth tip and the tooth tip support are configured with rotating surfaces to reduce wear.

However, in the land processing tool described in this publication, the position of the pin for preventing the tooth tip from falling off by the tooth tip support is provided adjacent to the open end of the tooth tip socket.
Since the surface in the vicinity of the pin position is constructed of a flat surface, it has only a narrow partial contact surface, and the effect of reducing wear cannot be obtained in the vicinity of the pin position.

In addition, in this land processing tool, when the tooth tip receives a lateral force and is rotated relative to the tip support, the rotation is centered around the pin position, so the tooth tip is rotated relative to the tip support. It has the disadvantage that large forces are applied to the pin, since it is limited only by the engagement of the side wall on one side of the tip of the body support with the corresponding inner side wall of the socket of the tooth tip.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a new land working tool which overcomes the aforementioned drawbacks of conventional land working tools.

The above-mentioned object of the present invention is to provide a land processing tool with a pin position approximately in the middle of the fitting contact surface of the tooth tip socket and the support part of the tooth tip support, and to This is achieved by configuring the contact surface of the support part of the support body to be two different rotating surfaces and configuring these rotating surfaces to have a common axis of rotation at the pin position.

In the land processing tool configured as described above, when the tooth tip receives thrust and lateral force, the tooth tip and the fitting surface of the tooth tip support, excluding the pin position, make rotating surface contact, that is, the tooth tip receives thrust and lateral force. Wear is reduced compared to conventional land machining tools because all surfaces where the tip and tip supports contact each other make rolling surface contact.

In addition, this land processing tool is configured to rotate around the pin position or its surroundings.
Since the rotation is limited in two places by the side wall on one side in front of the support and socket and on the other side in the rear, no significant force is exerted on the pin.

Next, the land processing tool of the present invention will be explained with reference to the drawings.

1 and 2, a land working tool 40 of the present invention is shown which comprises a tip 10, a tip support 20 and a pin 30.

The tooth tip support 20 has a wedge-shaped support portion 21 for supporting the tooth tip 10 at its front portion, and a hole 22 for accommodating a pin is provided in this support portion approximately in the middle thereof.

The wedge-shaped support 21 has an upper surface b' and a lower surface b'' consisting of a convex rotating surface at the front portion of the pin, as will be described later in connection with FIGS. The rear portion has an upper surface b' and a lower surface b'' consisting of a concave rotating surface.

The tooth tip 10 has a socket 11 in its rear interior, which has a shape complementary to the shape of the wedge-shaped support 21 of the tooth tip support 20 .

This socket 11 is also provided with a hole 23 for accommodating a pin 30.

This socket has an upper surface a' and a lower surface a'' consisting of a concave rotating surface on the forward portion of the pin and a convex surface of rotation on the rearward portion of the pin, as described below in connection with FIGS. 3 and 4. It has an upper surface C' and a lower surface C'' consisting of a rotating surface of .

The tooth tip 10 is held on the tooth tip support 20 by fitting a pin 30 into the tooth tip support 20 after a tooth tip socket 11 is fitted into a support portion 21 of the tooth tip support.

In this embodiment, only the pin 30 is used to hold the tooth tip to the tip support, but the combination of the pin and the key that locks the pin is configured to hold the tooth tip to the tip support. You may.

1 and 2 show a state in which the tooth tip 10 is receiving only the thrust force F1, and in this state, the socket surfaces a', a'', c' and C'' of the tooth tip 10 are The surfaces b', b'', d' and d' of the support part of the tooth tip support are in contact over their entire surface, respectively.

Referring now to FIG. 3, a geometric model constituting the surface of rotation of the present invention is shown.

The model A shown in Fig. 3a has a concave rotating surface a formed by rotating the generatrix a0 about the rotational axis S, and the socket surfaces a' and a'' of the tooth tips are part of this concave rotating surface. It is formed in a shape corresponding to the section.

Similarly, the surfaces of rotation byc and d of models B, C and D shown in FIGS. 3b, 3d and 3e are surfaces b', b" of the support part, c', c" of the socket, and correspond to the surfaces d', d'' of the support.

As shown in FIGS. 3c and 31, model A is in contact with model B with its rotating surfaces a and b on the entire surface,
Similarly, model C is rotatable relative to model D.

Although the generatrix is shown as a straight line in this example, it is not necessarily limited to a straight line.

Referring now to FIG. 4, a cross-section taken along lines XX and Y-Y of FIG. 2 is shown.

As is clear from FIG. 4a, the socket of the tip 10 has surfaces a', a which are concave rotating surfaces in the front part of the pin.
``, and the support part of the tooth tip support 20 has a surface b', b'' consisting of a convex rotating surface in the front part of the pin.

Similarly, as can be seen from FIG. 4b, the socket of the tooth tip 10 has a surface C', C'' consisting of a convex rotating surface in the rear part of the pin, and the support part of the tooth tip support 20 has a concave surface of revolution. It has a surface d'd'' consisting of a rotating surface.

Surfaces a', a'' are in contact with surfaces b', b'', and surfaces c', c'' are in contact with surfaces d', d''.

Next, FIG. 5 shows a state in which the tooth tip 10 receives a lateral force F2 in addition to the thrust force F1.

As is clear from the drawing, the tip 10 is rotated about the pin position relative to the tip support 20, so that the inner side walls e' and g'' of the socket of the tip 10 are in contact with the support of the tip support 20. side walls i' and h'', respectively, and rotation is limited by the engagement of these side walls.

As is clear from the above description, in the land machining tool of the present invention, wear is reduced by the contact rotation of the rotating surface, and rotation is restricted by the two diagonal side walls, so there is an effect that no large force is applied to the pin. has.

[Brief explanation of drawings]

FIG. 1 is a horizontal cross-sectional view of the land working tool of the present invention taken along line 1--1 of FIG. FIG. 2 is a vertical cross-sectional view of the land working tool of the present invention taken along line 2--2 of FIG. FIG. 3 is a diagram showing a geometric model constituting the rotating surface of the land processing ball tool of the present invention. FIG. 4a is a sectional view taken along line X--X in FIG. 2. FIG. FIG. 4b is a cross-sectional view taken along line Y--Y in FIG. FIG. 5 is a horizontal sectional view showing the state of the land machining tool when a lateral force is applied to the tooth tip. DESCRIPTION OF SYMBOLS 10...Tooth tip, 11...Socket for the tip of the tooth, 20...Tooth tip support, 21...Support part of the tooth tip support, 22...Hole for accommodating the pin, 30...Pin, A, B, 0, D...Geometric Scientific model, 23...
A hole that accommodates a pin.

Claims (1)

[Claims] 1. In a land processing tool in which the tooth tip is fitted and held on the tooth tip support, a pin position is provided in the middle part of the support part of the tooth tip support, and the pin position is provided in the middle part of the support part of the tooth tip support, and The part has a surface consisting of an uneven rotating surface having a common axis of rotation at the pin position, and the socket of the tooth tip also consists of an uneven rotating surface with the pin position as a boundary so as to fit into the support part. The socket and the support are configured such that the tooth tip rotates relative to the tooth tip support about a circumference including the pin position when the tooth tip is subjected to thrust and lateral forces. A land processing tool characterized by: 2. Scope of Patent Claims In the land processing tool according to item 1, the rotation of the tooth tip relative to the tooth tip support causes the tooth tip socket and the side wall on one side in front of the support part of the tooth tip support and the A land working tool characterized in that it is limited by each of the rear pond side side walls diagonally to the side walls.