JPS587772B2 - 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. constituted by separate surfaces of rotation, and the two separate surfaces of rotation are located at the pin position or
The present invention relates to an earth working tool having a common axis of rotation around its surroundings, and further provided with a support surface for receiving a beam force on a mating contact surface.

In conventional land processing tools in which the tooth tip support supports the tooth tip by a servant-shaped fitting, the socket of the tooth tip and the support part of the tooth tip support have flat top and bottom 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 "backlash" in the fit. and rotate.

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 their service life is short. It had

Furthermore, the above-mentioned land working tool has a drawback in that when the tooth tip receives a longitudinal force, that is, a beam force, while the tooth tip is not receiving thrust, the pin receives a large force.

In order to eliminate the former drawback, that is, the occurrence of significant wear, Japanese Patent Publication No. 38-3538 proposes a new technology in which the contact surfaces of the tooth tip and the tooth tip support are configured with rotating surfaces to reduce wear. We are proposing processing tools.

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

Further, this land processing tool does not propose any solution to the latter drawback mentioned above, that is, a large force is applied to the pin by the beam force.

Next, in order to eliminate the latter drawback mentioned above, that is, a large force is applied to the pin by the beam force, Japanese Patent Publication No. 18190/1989 discloses that a beam support surface is attached to the fitting surface of the tooth tip and the tooth tip support. It is proposed that a

However, the land processing tool described in this publication does not propose any solution to the above-mentioned drawbacks.

For example, some of the land processing tools described in this publication have pins installed in the horizontal direction, but it is clear that a large force is applied to the horizontal pin when the tooth tip receives a lateral force. .

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel land working tool that overcomes the aforementioned various drawbacks of conventional land working tools.

The above-mentioned object of the present invention is to provide a land processing tool in which the pin position is provided near the center of the cheek of the fitting contact surface of the socket of the tooth tip and the support part of the tooth tip support, and A support in which the contact surface of the support part of the tip support body is composed of two different rotating surfaces, the rotating surfaces are configured to have a common axis of rotation at the pin position, and the fitting contact surface receives a beam force. Selected by providing a surface.

In the land machining 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 and beam support surface, do not come into contact with the rotating surface. Because of this, i.e. all surfaces where the tooth tips and tip supports are in contact with each other are in rolling contact, wear is reduced compared to conventional land working tools.

In addition, this land processing tool is configured to rotate around the pin position or around the pin position, but the rotation is performed by rotating the support part and the side wall on one side in front of the socket and the side wall on the other side in the rear side. Since it is limited by two places, no large force acts on the pin.

In addition, when the tooth tip receives a beam force without receiving any thrust, the beam support is provided in the socket of the tooth tip and the support part of the tooth tip support, so that the tooth tip support is moved by the engagement of the beam support surface. The longitudinal movement of the tooth tip against the pin is restricted and the pin is not subjected to large forces.

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 body 20 has a servant-shaped support part 21 that supports the tooth tip 10 at the front part, and a hole 22 for accommodating a pin is provided in the support part approximately in the middle thereof.

The support part 21 of the model has an upper beam support surface h' and a lower beam support surface h'', which are flat surfaces, and a convex portion in the front part of the pin, as will be described later in connection with FIGS. 3 and 4. an upper surface b' and a lower surface b'' consisting of surfaces of revolution in the form of a shape, and in the rear part of the pin an upper beam bearing surface j' and a lower beam bearing surface j'' likewise consisting of flat surfaces;
and an upper surface d' and a lower surface d'' consisting of concave rotating surfaces.

The tooth tip 10 has a socket 11 in its rear interior, which has a shape complementary to the shape of the bow-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 beam bearing surface g' and a T beam bearing surface g'' consisting of a flat surface and a concave rotary surface in the forward portion of the pin, as described below in connection with FIGS. 3 and 4. an upper beam bearing surface i' and a lower beam bearing surface i'', which also consist of flat surfaces, and a concave rotating surface in the rear part of the pin; It has an upper surface C' and a lower surface c'' consisting of.

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

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

Figures 1 and 2 show a state in which the tooth tip 10 is receiving only gravity and is not receiving thrust, lateral force, longitudinal force (beam force), etc. In this state, the tooth The first 10 are
By the engagement of the surfaces g', a', e' and i' of the socket with the surfaces h', b', d' and j' of the support,
It is supported on a tooth tip support 20.

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

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

Similarly, the surfaces of rotation b, c and d of models B, C and D shown in Figures 3b, 3d and 3e are the surfaces of the support part, b/, bIf @ the surfaces of the socket c', c ″
and correspond to the surfaces d', d'' of the support.

As shown in Figures 3c and 3f, 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.

Next, referring to FIG. 4, the line W-W and the line X- in FIG.
Cross sections along lines X, Y-Y and zz are shown.

Note that FIG. 6 shows a state in which the tooth tip 10 is receiving only the thrust force F1.

As is clear from FIG. 4a, the socket of the tooth tip 10 has flat surfaces g', g'' at the most forward part from the pin.
The tooth tip support 20 and the support likewise have flat surfaces h', h''.

4b, the socket of the tooth tip 10 has a surface a', "a" consisting of a concave surface of revolution in the immediate forward part of the pin, while the support part of the tooth tip support 20 It has surfaces b', b'' consisting of convex rotating surfaces.

Next, as is clear from FIG. 4c, the socket of the tooth tip 10 has a surface c' consisting of a convex rotating surface immediately behind the pin.
, c'', while the support portion of the tooth tip support 20 has square surfaces d', d'' consisting of concave rotating surfaces.

As is clear from FIG. 4d, the socket of the tooth tip 10 has flat surfaces i', i'' in its most rearward part from the pin, and the support part of the tooth tip support shi0 has, in the opposite direction, flat surface j′
,j″.

As shown in Figures 4a to 4d, the tooth tip is thrust F1
a', a'', c', c'' are on the surface b'
, b'', d', d'', respectively, but the surface g'
, g", i', i" and surfaces b', h", j'
, J'' are in a separated state.

Referring now to FIG. 7, the tooth tip 10 is shown receiving a lateral force F2 in addition to the thrust F1.

As is clear from the drawings, the tooth tip 10 is rotated from the position shown in FIG.
' and m' respectively engage side walls e' and n'' of the support portion of the tooth tip support rest 20, and rotation is limited by the engagement of the side walls.

Next, referring to FIG. 8, there is shown a state in which a beam force (a longitudinal force) is applied to the tooth tip without receiving the thrust F1.

In this case, the flat surfaces g' and i'' of the socket of the tooth tip 10 engage the flat surfaces h' and j'' of the support of the tooth tip support 20, and further movement is restricted.

That is, these flat surfaces act as beam support surfaces.

As is clear from the above description, in the land machining tool of the present invention, contact rotation by the rotating surface reduces wear, and since the rotation is restricted by the two diagonal side walls, a large force is not applied to the pin. Moreover, since it has a beam support surface, it has the effect that the large force caused by the beam force is not applied to the pin.

[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 convoluted surface of the land processing tool of the present invention. FIG. 4 is a cross-sectional view taken along lines w--w, xx--x, Y--Y, and z--z in FIG. 6, respectively. Figure 5 shows the line 5- in Figure 6 when the tooth tip receives thrust.
FIG. 5 is a horizontal cross-sectional view along line 5; Figure 6 shows the line 6- in Figure 5 when the tooth tip receives thrust.
FIG. 6 is a vertical cross-sectional view along line 6; FIG. 7 is a horizontal sectional view when the tooth tip is subjected to thrust and lateral force. FIG. 8 is a vertical cross-sectional view when the tooth tip receives a beam force. DESCRIPTION OF SYMBOLS 10... Tooth tip, 11... Tooth tip socket, 20... Tooth tip support, 21... Support part of tooth tip support, 22... Pin accommodation hole, 3
0... Pin, A, B, C, D... Geometric model, 23... Pin accommodation hole.

Claims (1)

[Claims] 1. In an earth processing tool in which the tooth tip is fitted and held on the tooth tip support, a pin position is provided in the middle of the support part of the tooth tip support, and In the front part,
having a flat beam support surface, immediately forward and rearward of the pin location, having a surface consisting of a concave and convex surface of rotation having a common axis of rotation at the pin location, and flat in a portion immediately forward and rearward of the pin location; The socket of the tooth tip also has an uneven rotating surface with the pin position as a border so that it fits into the support part, and has a beam support surface, and the tooth tip has a thrust and a An earth working tool characterized in that the socket and the support are configured such that the tooth tip rotates about a circumference including the pin position relative to the tooth tip support when subjected to a lateral force. 2. In the land processing tool according to claim 1, the rotation of the tooth tip relative to the tooth tip support causes the tooth tip socket and one side wall in front of the support part of the tooth tip support and the side wall. Land working tool, characterized in that it is limited by the engagement of each of the side walls of the other side diagonally to the rear. 3. In the land processing tool according to claim 1, when the tooth tip receives a beam force, the movement of the tooth tip occurs on one of the upper and lower beam support surfaces in front of the tooth tip and the tooth tip support pair, and or one of the beam support surfaces diagonally with respect to the other beam support surface.