SU1404343A1 - Portable engine saw - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to forestry and woodworking industry. The purpose of the invention. Reducing the vibration of the handle of the support frame. The portable chain saw includes a sawing motor and a support frame with control handles and a gas tank 5. The gas tank 5 is in the shape of a cylinder. The longitudinal axis of the gas tank 5 is located B plane of the support frame. In the cavity of the gas tank 5, partitions are installed in the form of disks 9 with radial cuts 10, rings 11, 12, and plates 13. Partitions form cells, the volume of which decreases in the direction of the ends. When the saw is operating, the engine generates spatial oscillations that are transmitted to the gas tank 5. Reducing the cell volume to the ends of the gas tank 5 leads to an increase in the reduced mass of fuel concentrated at its ends, which increases the efficiency of the spatial vibration isolation of the control knobs at idle and working modes. 5 il. (Oh (L

Description

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The invention relates to portable chain saws and can be used in forest and wood processing industry.

The purpose of the invention is to reduce the vibration of the arms of the support frame.

FIG. 1 shows a portable motor-saw, general view; in fig. 2- fo, top view; in fig. 3 - benzo tank, general view; in fig. 4 - section A-A in FIG. 3; in fig. 5 - gas tank S axonometry, general view.

The portable motor plate contains a motor with a saw unit 2, a support frame 3, rigidly connected with the control handles 4 and a fuel tank M 5, equal stiff elastic elements 6-8, connecting the support frame 3 and the engine 1. Support frame 3 with handles 4 and the gas tank 5 forms the Zyyyy – Kiyro system, which has the main central inertia axes 1x, 1, If. The elastic elements 6-8 are located in the plane 1x, 1y. The gas tank has a farm of dilindra. The longitudinal axis of the gas tank is located in the plane of the support frame 3.

In the cavity; the gas tank 5 has partitions mounted in the form of assembled ones with variable pitch, decreasing at the cylinder ends along its axis, discs 9 with radial cuts 10. Between the discs 9 there are concentric surfaces of the gas tank 5 with rings 11, 12 g X and width a, a, and a in the radial sections 10 of the disk 9, the plates 13 are installed. In total, the disks 9, the rings 11 and 12 and the plates 13 form variable volume cells, and the volume of the cells decreases to the ends of the gas tank 5.

Saw works as follows.

Engine 1 generates spatial oscillations that are transmitted through elastic elements 6-8 to the support Hyjo frame 3, control knob 4 and gas tank 5. Partitions 11-13 of the cells restrict the movement of fuel relative to the body of gas tank 5, and the mass of fuel each cell oscillates with the gas tank 5, increasing the reduced mass of the support frame 3. The fuel overflow is provided by gaps made between the elements of the cells (not shown). The decrease in the volume of the cells to the ends of the gas tank 5 leads to an increase in the reduced mass of fuel concentrated at its ends, i.e. the reduced moments of inertia of the support frame 3 are increased relative to the axes Ij: and 1d. without increasing the weight of the gas tank 5, the mass of the fuel and the change in its design. With unchanged stiffness of elastic elements 6-8, this leads to a decrease in the system's natural frequencies, a shift of the spectrum to the low-frequency region, which significantly increases the system sludge from resonances and increases the efficiency of spatial vibration isolation of control 4 handles at idle and working modes. Since the design of the gas tank 5 consists of simple elements made by stamping, its production technology is greatly simplified.

Claims (1)

Invention Formula A portable motor-saw that includes a motor with a sawing device, a support frame with control handles and a gas tank made in the form of a cylinder, so that the fuel tank is installed with its longitudinal axis in the plane of the support in order to reduce vibration the frame and the gas tank cavity are divided by partitions, made in the form of discs having radial slits, between which rings of the fuel tank are concentrated, and plates inserted into the discs of the discs, forming together with the disc and koltsadm and cells with a decreasing variable volume in the directions of the gas tank ends. Fie.2 . .. h ;; Rig