JP2010051329A - Small working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent vibration-proof structure required in a grip-type or shouldering-type small working machine, wherein a vibration generating source such as an engine, cutter, etc., makes an operator hard to work for a long time. <P>SOLUTION: There is provided the small working machine in which an engine 3 is supported on a frame 1 provided with a handle 4, through a vibration-proof structure, wherein the vibration-proof structure has a floating structure configured to intervene an engine mounting spring 10 between the frame 1 and the engine 3, the engine mounting spring is a cylindrical coil spring and fixed on the engine 3 by a bolt 12 penetrating through a small diameter attachment ring 11 formed on one end, and the other end is inserted to an embedded holder 1b engaged to a penetrating hole 1a formed on the frame 1. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a small working machine in which an engine is supported by a frame having a handle.

A small working machine having a reciprocating blade or a rotary blade , such as a hedge trimmer, a brush cutter, or a chain saw , supports an engine on a frame having a handle. For example, Patent Document 1 discloses a tea tree trimming machine (a kind of hedge trimmer) in which a vibration isolating member is disposed between a support bracket of a blower and a support member of a handle (Patent Document 1, Claim 1 and others). . The anti-vibration member is, for example, an anti-vibration rubber (paragraph [0016] in Patent Document 1).

Japanese Patent Laid-Open No. 11-155370

Vibration generation sources such as engines and cutters make it difficult for workers to work for a long time in gripping and backpack type small working machines, and an excellent vibration-proof structure is required.

As a result of examining the above problems, in a compact working machine that supports an engine on a frame provided with a handle via an anti-vibration structure, the anti-vibration structure includes an engine mounting spring, which is a cylindrical coil spring, interposed between the frame and the engine. We have developed a small working machine with a floating structure. The engine mounting spring (1) is fixed to the engine with a bolt passing through a small-diameter spring mounting ring formed at one end, and the other end is inserted into an embedded holder fitted in a through hole formed in the frame.

  The engine mounting spring is (2) fixed to the engine with a bolt passed through a small-diameter spring mounting ring formed at one end, and the other end is directly inserted into a stepped hole formed in the frame. (3) formed at one end It is fixed to the engine with a bolt that passes through a small-diameter spring mounting ring, a backing plate is fixed outside the through hole formed in the frame, and the other end is directly inserted into the through hole. (4) formed at one end It is fixed to the engine with bolts that pass through a small-diameter spring mounting ring, and a stop ring is attached to the inner periphery of a through hole formed in the frame, and the other end is directly inserted into the through hole, or (5) a buried in the engine One end may be pressed and fixed in the insertion hole, a contact plate may be fixed outside the through hole formed in the frame, and the other end may be directly inserted into the through hole.

  Further, the engine mounting springs are oriented substantially perpendicular to the longitudinal direction of the frame and arranged substantially parallel to each of the two front and rear, or two opposing left and right sides perpendicular to the longitudinal direction of the frame, and the longitudinal center of the frame Place in 3 places, 1 place.

Vibration generating source of the engine and the cutter or the like of a small working machine, in-grip and backpack-type working machine, than it has been difficult, excellent vibration damping is required a long time of work to workers However, by adopting the vibration isolation structure using various engine mounting springs proposed here, it is possible to work continuously for a long time, and select from these mounting structures and devise the shape of the bracket. For example, it can be efficiently applied to various working machines with vibrations at low cost, and it is an excellent small working machine coupled with the brake device.

It is a whole side view of a hedge trimmer. It is a frame partly broken top view of a hedge trimmer. It is a partially broken plan view of an engine mounting spring part. It is an engine attachment spring side view. It is a partially broken top view which shows the other example of an engine attachment spring. It is a partially broken top view which shows the other example of an engine attachment spring. It is a partially broken top view which shows the other example of an engine attachment spring. It is a partially broken top view which shows the other example of an engine attachment spring. It is a partially broken top view which shows the other example of the flame | frame part of a hedge trimmer. It is a partially broken side view which shows the state which attached the engine attachment spring to the backpack type working machine. It is II sectional drawing in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. If Shimese an embodiment of the present invention in the hedge trimmer of these figures (small working machine), 1, frame 1 as shown in FIG. 2, cam case 2, the engine 3, the rear wheel 4, before the handle 5 and the cutter 6 Ru is configured. The cam case 2 is configured substantially integrally with the brake case 7. The rear handle 4 is provided with an operation lever 8 for operating the engine speed and the brake. The engine 3 is equipped with a carburetor 9 that supplies fuel to the engine while controlling the fuel.

The connection of the cam case 2 and the frame 1 integrated with the engine 3 engine mounting springs 10 are used, the aim of vibration damping effect hardly convey the vibrations from the engine 3 and the cutter 6, etc. to the rear wheel 4 and the front wheel 5 Yes. That is, as shown in FIG. 2, the rear handle 4 and the front handle 5 have a floating structure through an engine mounting spring 10 with respect to the engine 3 (in this example, the cam case 2 integrated with the engine 1) that is a vibration generation source. It has become. The engine mounting spring 10 is a cylindrical coil spring. As shown in FIGS. 3 and 4, the cam case 2 is attached to the cam case 2 by a bolt 12 passed through a small-diameter spring mounting ring 11 formed on one end of a cover holder 13 with a flange. It is fixed, and the other end is inserted into an embedded holder 1b with a flange fitted into the through hole 1a of the frame 1. Engine mounting spring 10 are substantially at right angles against the longitudinal Direction of frame 1, they are arranged in parallel each two places Ateryaku back and forth. The engine mounting spring 10 arranged in this way provides a compact and highly vibration-proof structure.

5 to 8 are partially broken plan views showing other examples of the engine mounting spring 10 . Here, the mounting structure on the cam case 2 side in FIGS. 5 to 7 is the same as that in FIG. 3, but the mounting structure on the frame 1 side is different. In the case of FIG. 5, a stepped hole 1c formed during molding of the frame 1, and insert the engine mounting spring 10 to the stepped hole 1c. In FIG. 6, not the stepped hole, but the contact plate 1 d of the engine mounting spring 10 is fixed to the frame 1 with the bolt 12 on the outside as the through hole 1 a, and the same effect is obtained. FIG. 7 shows a structure in which an engine mounting spring 10 is fixed by attaching a stop ring 1e to the inner periphery of the through hole 1a.

Figure 8 is slightly higher than the diameter of the engine mounting springs 10 provide a small diameter embedding hole 2a to cam case 2 side, which in the one end of the engine mounting the spring 10 to press and fix, frame 1 side 6 Similarly, the through-hole The other end of the engine attachment spring 10 is inserted into 1a and attached with the contact plate 1d and the bolt 12. In this case, an ordinary cylindrical coil spring can be easily fixed, instead of the cylindrical coil spring with the spring mounting ring 11 shown in FIG. Such an engine mounting spring 10 provides a vibration-proof structure that is compact and has a high vibration-proof effect, similar to those shown in FIGS.

FIG. 9 is a partially broken plan view showing another example of the frame portion of the hedge trimmer. In Figure 2, four Although mounting direction of the engine mount spring 10 has been disposed on the left and right in the longitudinal direction perpendicularly faces the frame 1 all, the cutter 6 side in this example, the longitudinal direction perpendicular frame 1 2 shows the structure in which the cam case 2 is held by the engine mounting springs 10 in total in two places on the left and right sides and on the rear handle 4 side in the center in the longitudinal direction of the frame 1. The longitudinal engine mounting spring 10 is fixed in the structure shown in FIG. 3, and if necessary, a vibration-proof structure having a high degree of freedom can be employed, such as a stronger one than the other engine mounting springs 10 .

FIG. 10 is a partially broken side view showing a state in which the engine mounting spring 10 is attached to the backpack-type working machine instead of the conventional cam case. Backpack type work machines are used in various types such as brush cutters, pruning machines, chain saws, power sprayers, etc., all of which vibrate vigorously, from the back frame 32 to which the frame 1 is attached from the engine 3 to the shoulder band 33. If, took up a fraction even though using a thick shoulder rest 34, the vibration is transmitted mercilessly. Therefore, an excellent anti-vibration structure is required, but it is extremely effective to employ the engine mounting spring 10 shown in FIGS. 3 to 8 used here. The example shown in FIGS. 10 and 11 employs an anti-vibration structure using the engine mounting spring 10 shown in FIG. 3 between the mounting bracket 35 of the engine 3 and the frame 1 and the mounting bracket 35 on the back frame 40 side. It is. As described above, if the vibration isolating structure using the engine mounting spring 10 as illustrated in FIGS. 3 to 8 is selected and the shape of the bracket is devised, various work machines with vibration can be reduced in cost. The vibration-proof structure can be applied efficiently.

1 Frame 2 Cam Case 3 Engine 4 Rear Handle 5 Front Handle 6 Cutter 7 Brake Case 8 Operation Lever 9 Carburetor
10 Engine mounting spring
11 spring attachment ring
12 volts
13 Cover holder
32 Backpack frame
33 Shoulder band
34 Shoulder pad
35 Engine mounting bracket

Claims (8)

In a small working machine that supports the engine through a vibration-proof structure on a frame with a handle,
A compact working machine characterized in that the vibration-proof structure is a floating structure in which an engine mounting spring, which is a cylindrical coil spring, is interposed between the frame and the engine. The engine mounting spring
It is fixed to the engine with a bolt that passes through a small-diameter spring mounting ring formed at one end.
The small working machine according to claim 1, wherein the other end is inserted into an embedded holder fitted in a through hole formed in the frame. The engine mounting spring
It is fixed to the engine with a bolt that passes through a small-diameter spring mounting ring formed at one end.
The small working machine according to claim 1, wherein the other end is inserted into a stepped hole formed in the frame. The engine mounting spring
It is fixed to the engine with a bolt that passes through a small-diameter spring mounting ring formed at one end.
The small working machine according to claim 1, wherein a contact plate is fixed to the outside of the through hole formed in the frame, and the other end is directly inserted into the through hole. The engine mounting spring
It is fixed to the engine with a bolt that passes through a small-diameter spring mounting ring formed at one end.
The small working machine according to claim 1, wherein a stop ring is attached to an inner periphery of a through hole formed in the frame, and the other end is directly inserted into the through hole. The engine mounting spring
One end is pressed and fixed in the embedding hole provided in the engine,
The small working machine according to claim 1, wherein a contact plate is fixed to the outside of the through hole formed in the frame, and the other end is directly inserted into the through hole. The engine mounting spring
The small working machine according to any one of claims 1 to 6, wherein the small working machine is arranged substantially parallel to the longitudinal direction of the frame and arranged substantially parallel to each of the two front and rear sides. The engine mounting spring
The small working machine according to any one of claims 1 to 6, which is disposed at a total of three places, two oppositely facing right and left in the longitudinal direction of the frame and one center in the longitudinal direction of the frame.

Images