SU1412947A1 - Portable motor saw - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to forestry and woodworking. The purpose of the invention is to reduce vibration on the control handles and increase reliability. The portable motor saw contains a motor with a sawing device, a rack with eyes 4 and 5, a gas tank 7, control handles 8 and 9 rigidly connected, to the supporting

Description

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frame 10, two front elastic elements 11 and 12 and one rear elastic element. Inside each elastic ment 11 and 12, an elastic rod 14 is coaxially mounted. One end thereof is fixed to the support frame 10, and the other end is passed through the hole of one of the lugs 4 or 5. The elastic rod 14 has a load 15 on the fence. The elastic elements 11 and 12 are made in type cylinder 5 d helical springs. The centers of their hardness are 0, Oj, and O4 are located on the circumference, the center of which coincides

12947

with the center of mass O, the support frame 10. The centers of rigidity Og, Oj, Of are placed with equal angular intervals of 120 °. The axes of the front elastic elements 11 and 12 are located tangentially to the circumference of the centers of stiffness 0 ,, Oj, 0. When the saw is working, the location of the elastic elements 11 and 12, as well as the presence of elastic rods 14 with loads 15 acting inside them vibrations, allows to reduce the vibration levels of the knobs 8 and 9. 3 sludge.

I1

I The invention relates to motor saws and can be used in the l (dc and woodworking industry).

d. The purpose of the invention is to reduce the vibration on the control handles and ensure reliability.

Figure 1 shows a portable motor saw, a general view; in fig, 2 - in | ed A per fng, 1; on fig.Z - section bb nk figure 2. . .

The portable motor-saw contains an engine 1 with a sawing device 2, a rack 3 with eyes 4-6, a gas tank 7 and handles 8 and 9 of the control rigidly connected to the support frame 10, two first and one rear equal-elastic elements 11-13, connected zyvayuschih siyorna frame 10 with a rack 3.

Inside each elastic element 11–13, the elastic rod i4 is coaxially mounted, one end of the I coTOporo fixed on the support frame 10, and the other with. the calculated gap is passed through the hole of one of the lugs 4-6, which is equipped with the column 3. The elastic rod 14 has a weight 15 at the end and can be made, for example, from a cable segment.

The center of mass of the support frame 10 is at the point O ,. The axes X, y, z, are the main central axes of inertia of the frame 10, and the axes P, q, g are the main axes of rigidity of the elastic elements 11-13, The elastic elements 11-13 are made in the form of cylindrical coil springs, us centers Og , Oj, 04

stiffnesses are located around a circle whose center coincides with the center of mass 0; | support frame 10 and at equal angular intervals of 120 ° in the x, 0, y, plane. The plane X, 0, y, is formed by the horizontal main central axes 0, x and 0, and the inertia of the support frame 10. The rear elastic element 13 is located on. the main central axis is 0, x, inertia, its longitudinal axis is perpendicular to the horizontal plane x, 0, y. The centers of the handles 8 and 9 lie on one of the horizontal axes O, y, and inertia are symmetrical to the center of mass OJ of the frame 10.

The axes of the front three elements 11 and 12 are located tangentially to the circumference of the centers Og, Oj, 0 of the stiffness of the elastic elements 11-13 and perpendicular to the supporting surfaces of the front of the supporting frame 10. The contour of the front of the supporting frame 10. is concave symmetrically relative to the main central axis O, X, inertia towards the center of O,.

Portable motor saw works as follows.

The motor 1 generates a spatial vibration, which is transmitted through the elastic elements 11-13 to the handles 8 and 9 of the support frame 10. The arrangement of the elastic elements 11-13, oriented in different directions in space, reduces the vibration levels of the handles 8 and 9 the support frame 10, because inside the elastic elements 11-13 are elastic rods 14 with weights 15 on

end, which perform the role of dynamic and shock absorbers of spatial oscillations of the support frame 10.

In idle mode, with a slight movement of the support frame 10, the alignment of the eyes 4-6 of the rack 3 / rods 14 oscillate in space, not coming into contact with the eyes 4-6, and do not work as dynamic dampers. Their frequency setting is made according to the cut:

Wo Wpc.

where m is the reduced weight of goods

15 kg;

k - reduced stiffness of elastic rods 14, kN / m.

In the swathing or cutting mode, the rods 14 touch the surface of the holes of the lugs 4-6, i.e. they become shock absorbers.

The location of the front elastic elements 11 and 12 tangential to the circumference of the centers Og, 0}, 04 stiffness of the elastic elements 11-13 provides uniform axial loading of the front elastic elements 11 and 12 when the control torque M is applied, around the Z axis. One of the elastic elements, natrimer 11, is compressed, and another, for example 12, is stretched. At the limiting values of the moment M, the elastic element 11 sits on the turn and serves as a limiter for the movement of the support frame 10. At opposite directions of the moment, the elastic element 12.

When cutting or sticking the chain of the saw unit 2 in wood, removing the saw unit 2 from the slot to the handles 8 and 9, the butt is deformed in the same way.

Moment Mg relative to axis y, is given. In this case, the role of the limiter of the angular displacement of the support frame 10 around the y axis is performed by the elastic element 13 when the turn is placed on the twisted one. In addition, the presence of rods 14 in each of the elastic elements 11-13 with weights 15 at the end, passed through the holes in the lugs 4-6, makes it possible to further restrict the movement of the support frame 10 relative to the rack 3 in space and thus increase the reliability of the suspension.

15

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five

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that is, and

rmula invented

A portable motor-saw, including a motor with a sawing unit, a stand, a gas tank, control handles rigidly connected to a support frame and connecting front and rear elastic elements with a stand, whose centers of rigidity are located at equal angular intervals in the horizontal plane formed by the main central the axes of inertia of the support frame in a circle whose center coincides with the center of mass of the reference

5 characterized by that.

we

that, in order to reduce vibration on the control handles and increase reliability, the axes of the front elastic elements are located tangential to the circumference of the centers of stiffness of the elastic elements, and the axis of the rear elastic element is perpendicular to the horizontal plane, with a rod coaxially mounted inside each elastic element which is mounted on the support frame, and the other is passed through the hole of one of the lugs, which are mounted on the rack, and is equipped with a load.

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5-6 turned

Claims (1)

Claim A portable motor saw, including a motor with a saw unit, a stand, a gas tank, control handles rigidly connected to the support frame and connecting the front and rear elastic elements, the centers of rigidity of which are located at equal angular intervals in the horizontal plane formed by the main central axes of inertia support frame around a circle, the center of which coincides with the center of mass of the support frame, characterized in that, in order to reduce vibration on the control handles and increase reliability, the front axles elastic elements are located tangent to the circle of the centers of rigidity of the elastic elements, and the axis of the rear elastic element is perpendicular to the horizontal plane, with a rod coaxially installed inside each elastic element, one end of which is fixed to the support frame, and the other is passed through the hole of one of the eyes that are mounted on a rack, and is supplied with freight.