JPS5836701B2 - 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 rotating surfaces and having a common axis of rotation at or around the pin location, but one of the rotating surfaces does not contact each other, and the mating contact surface has a beam mirror. The present invention relates to such land working tools which are provided with a support surface for receiving.

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 a land machining tool, 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 1st play 11 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.

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 former drawback.

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 approximately in the middle of the fitting contact surface of the socket of the tooth tip and the support part of the tooth tip support, and The surface of the support part of the front support is composed of two different rotating surfaces, and these rotating surfaces are configured to have a common axis of rotation at the pin position, but only the rear rotating surface can be contacted from the pin position. This is achieved by providing a support surface for receiving the beam force on the mating contact surface.

In the land machining tool configured as described above, when the tooth tip receives thrust and lateral force, the pin position, the tooth tip and tooth tip support excluding the rotating surface and beam support surface in front of the pin position. Because the larger mating surfaces of the body make rolling contact, i.e. all surfaces where the tooth tips and tip supports make contact with each other make rolling contact, wear is reduced compared to traditional land cutting tools. Reduced.

Furthermore, since the tip of the tooth immediately in front of the pin position and the rotating surface of the tooth tip support are not in contact with each other, almost no force is applied to these parts, so the wall thickness of the socket can be made relatively thin. It is also possible to shorten the hollow portion of the tip and the tip of the support.

In addition, in this land processing tool, the pin position or
The pin is configured to rotate around its surroundings, but the rotation is limited by two places: the side wall on one side in front of the support and the socket, and the side wall on the other side in the rear. No large force acts on it.

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

A: 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 includes 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 on the front portion thereof, and a hole 22 for accommodating a pin is provided in the support portion approximately in the middle thereof.

The wedge-shaped support 21 has an upper bead of flat surface on the front part of the pin, as will be described below in connection with FIGS. 3 and 4. beam support surface h' and lower beam support surface h'', and an upper surface b' and a lower surface b consisting of a convex rotating surface.
It has an upper beam support surface j' and a lower beam support surface j'', which are also made of flat surfaces, and an upper surface d' and a lower surface dI which are separated from the concave rotating surface, and in the rear part of the pin. ′.

The tooth tip 10 has in its rear interior a socket 11 having a shape complementary to the shape of the wedge-shaped support 21 of the tooth tip support 20 3 This socket 11 is likewise provided with a hole 23 for receiving a pin 30 . There is.

As described below in connection with FIGS. 3 and 4, this socket has an upper beam support surface 〆 and a lower beam support surface gI+ consisting of flat surfaces on the front part of the pin, and a concave rotating surface. an upper beam bearing surface i' and a lower beam bearing surface i I+ having an upper surface a' and a lower surface a'1 and, on the rearward part of the pin, also from a flat surface;
, and has an upper surface C' and a lower surface CI+ consisting of a convex rotating surface.

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 arranged to hold the tip of the tooth to the tip support. It's okay.

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 C/, CI+ of the tooth tip 10 are on the support part of the tooth tip support. surface d
', d'' respectively.

In the embodiment, surfaces a, a1' and b/, bl+ are rotating surfaces that do not contact each other, but may have any shape as long as they do not contact each other.

However, surface c/, CI+ and surface d/,
dIf wears out and surfaces a/, aI+ and surfaces b/,
Considering the case where bIt comes into contact, surfaces a', a0 and surfaces bl, bI+ are preferably formed as rotating surfaces.

Referring now to FIG. 3, there is shown a geometrical model of the present invention which examines the surface of rotation.

Model A shown in FIG. 3a has generatrix a.

It has a concave rotating surface a formed by rotating around the rotational axis S, and the socket surfaces a' and a'' of the tooth tips are shaped to correspond to a part of the concave rotating surface. .

Similarly, the surfaces of rotation b, c and d of models B, C and D shown in FIGS. 3b, 3d and 3e are surfaces b/, bll of the support part; surfaces C', C11 of the socket; and corresponds to the surfaces d/ and dI+ of the support.

As shown in FIG. 3C, model A is in a non-contact state with respect to model B, and model C is rotatable in contact with model D as shown in FIG. 3F.

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 WW and the line X- in FIG.
X, cross sections along lines Y-Y and Z-Z are shown.

As is clear from FIG. 4a, the socket of the tooth tip 10 has a flat surface l, g'' in the most forward part from the pin, and the support part of the tooth tip support 20 likewise has a flat surface h/g''. , hI+.

4b, the socket of the tooth tip 10 has a surface a/, a11 consisting of a concave rotating surface in the immediate forward part of the pin, while the support part of the tooth tip support 20 has a convex surface. has certain surfaces b', b'' from the plane of rotation of .

Next, as is clear from Fig. 4c, the socket of the tooth tip 10 has a surface c formed of a convex rotating surface immediately behind the pin.
', c''', while the support part of the tooth tip support 20 has a surface d', d'' which extends from the concave surface of rotation.

As is clear from FIG. 4d, the socket of the tooth tip 10 has a flat surface i/,, TI in its most rearward part from the pin, and the support part of the tooth tip support 20 likewise has a flat surface j.
/, j I+.

As shown in FIGS. 4a to 4d, when the tooth tip 10 is receiving the thrust F1, the surfaces c/, CI+ are the surfaces a/
, all are in contact with the surfaces a/, aI+, respectively.
, g/, gIt, i/, il+ and the surface b/, bIt, h/, hII, j/, j
l1 is in a separated state.

Next, referring to FIG. 5, a state in which the tooth tip 10 is receiving a lateral force F2 in addition to the thrust force F1 is shown.

As is clear from the drawings, the tooth tip 10 is rotated from the position shown in FIG. and m'' respectively engage the side walls l' and nI+ of the support part of the tooth tip support 20, and rotation is limited by the engagement of the side walls.

Next, referring to FIG. 6, there is shown a state in which a beam force (a longitudinal force) is applied to the tooth tip without receiving the thrust force F1'.

In this case, the flat surface of the socket at tip 10 and 1
1+ engages the flat surfaces h' and j"1 of the support part of the 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 rotating surface of the land processing tool of the present invention. FIG. 4 is a sectional view taken along lines W--W, X--X, Y--Y and Z--Z in FIG. 2, respectively. FIG. 5 is a horizontal sectional view when the tooth tip is subjected to thrust and lateral force. FIG. 6 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...... Tooth tip support, 22 ...Pin accommodation hole, 3
0...Pin, A, B, C, D...Geometrical model, 23...Pin accommodation hole.

Claims (1)

[Scope of 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 of the support part of the tooth tip support, and a pin position is provided in the middle of the support part of the tooth tip support, and the tool can be held from the pin position. In the front part,
having a flat beam support surface, with a surface consisting of a concave and convex surface of rotation having a common axis of rotation at the pin location, immediately forward and rearward of the pin location, and having a flat beam support surface in the portion immediately forward and rearward of the pin location; It has a beam support surface, and the tooth tip socket also has an uneven rotating surface with the pin position as a boundary so as to fit into the support part, and has a beam support surface, The rotating surfaces of the socket and support do not contact each other, and the socket is configured such that when the tooth tip is subjected to thrust and lateral forces, the tooth tip rotates about the circumference including the pin position relative to the tooth tip support. and a support portion. 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. A land working tool, characterized in that it is limited by the engagement of each of its rear other side walls diagonally to the other side. 3. In the land processing tool according to claim 1, when the tooth tip receives a beam force, the tooth tip moves on one of the upper and lower beam support surfaces in front of the tooth tip and the tooth tip support, and or one of the beam support surfaces diagonally to the other beam support surface.