JP2002210705A - Chain saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a noise following cooling of a motor of a chain saw and discharge of chips. SOLUTION: A motor (7) for driving a saw chain (6) and a cooling fan (15) for sending cooling wind to the motor (7) are provided in a housing (1). A space between the saw chain (6), the motor (7) and the cooling fan (15) is partitioned with a partition (21) integrated with the housing (1). A chips discharging hole (22) is provided to a bottom part of the housing (1) corresponding to an end part of a cutting travelling route (6b) of the saw chain (6). A wind window (18) for blowing out an exhaust of the cooling wind toward the saw chain (6) is provided to an upper part of the partition (21). By composing the cooling fan (15) of a centrifugal fan, a noise generated following air-sending is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain saw capable of directing chips toward a chip discharge hole of a housing by exhausting cooling air from a motor.

[0002]

2. Description of the Related Art A chain saw has a motor in its housing for driving the saw chain and a cooling fan for sending cooling air to the motor. The saw chain, the motor, and the cooling fan are partitioned by a partition wall integral with the housing. A chip discharge hole is provided at the bottom of the housing corresponding to the end of the cutting path of the saw chain. In addition, an air window is provided at an upper part of the partition wall to blow out exhaust air of the cooling air toward the saw chain.

[0003] When cutting a workpiece with a chain saw,
An endless saw chain continuously runs on the cutting travel path and the non-cutting travel path on the guide bar, and the saw chain traveling on the cutting travel path is applied to the workpiece. Chips generated during the cutting of the work are discharged out of the housing through chip discharge holes at the bottom of the housing. On the other hand, the motor that drives the saw chain drives a cooling fan, takes in outside air into the housing as cooling air, and cools itself with the cooling air. The exhaust air after cooling the motor flows from the wind window toward the saw chain, and directs chips generated by cutting the work toward the chip discharge holes.

[0004]

The cooling fan of the motor in the conventional chain saw is constituted by an axial fan.
There is a drawback that the noise accompanying the ventilation increases. Also,
The axial fan has a low wind speed at the same rotation speed, and it is difficult to obtain a required wind speed. Further, when an axial fan is used, the position of the wind window is limited to the outside diameter of the fan, so that the degree of freedom in design is reduced.

[0005] The wind window in the conventional chain saw is
Since it is merely provided at the upper part of the partition wall, a part of the chip may go around the non-cutting traveling path of the saw chain, and the chip may block the lubricating oil supply hole. In other words, at places along the non-cutting path of the saw chain,
For example, Japanese Utility Model Laid-Open No. 59-43101,
As described in Japanese Patent No. 4503, a lubricating oil supply hole for supplying lubricating oil is formed between the saw chain and the guide bar, and the lubricating oil supply hole is easily clogged with chips or the like. When the lubricating oil supply hole is closed, poor lubrication occurs at the contact point between the saw chain and the guide bar, and a smooth cutting operation becomes difficult.

An object of the present invention is to provide means capable of solving the above problems.

[0007]

Means for Solving the Problems To solve the above-mentioned problems, the invention according to claim 1 comprises a motor (7) for driving a saw chain (6) in a housing (1) and a cooling air supplied to the motor (7). A cooling fan (15) for feeding the cooling fan (15) is provided, and a partition (2) integrated with the housing (1) is provided between the saw chain (6) and the motor (7) and the cooling fan (15).
A chip discharge hole (22) is provided at the bottom of the housing (1) corresponding to the end of the cutting path (6b) of the saw chain (6), and the cooling air is exhausted by the saw chain (6). In a chain saw provided with an air window (18) blown toward the upper side of the partition (21),
The cooling fan (15) employs a chain saw composed of a centrifugal fan.

In the invention according to claim 2, the wind window (18) is located at a position corresponding to a position above the location where the saw chain (6) turns from the cutting traveling path (6b) to the non-cutting traveling path (6a). The chain saw according to claim 1 provided is employed.

In the invention according to claim 3, the wind guide wall (18a) of the wind window (18) is provided with the chip discharge hole (22).
The chain saw according to claim 1 or claim 2 is inclined toward.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> As shown in FIGS. 1 to 4, this chain saw comprises a housing 1 and a housing 1.
, A front handle 2 integrated with a housing 1 protruding from a side surface of the housing 1, a guard 3 integrated with the housing 1 protruding from a side surface of a front end of the housing 1, and a housing 1 protruding rearward from a rear portion of the housing 1. It comprises a rear handle 4 formed in a special manner, a guide bar 5 protruding forward from the front end of the housing 1, and a saw chain 6 wound around the guide bar 5.

As shown in FIGS. 3 and 4, a motor 7 is placed horizontally inside the housing 1, and both ends of a motor shaft 7 a are supported by the housing 1 via bearings 8. A gear box 9 is formed integrally with the housing 1 at a position corresponding to the right end of the motor shaft 7a in the housing 1. The right end of the motor shaft 7a enters the gear box 9 and a pinion 10 is provided therein. The pinion 10 meshes with a gear 11 pivotally supported in the gear box 9 in the left-right direction. The right end of the shaft 11a of the gear 11 projects out of the gear box 9, and the sprocket wheel 12 is fixed to the projected end. The right side of the housing 1 on which the sprocket wheel 12 is provided is covered with a lid 13. The cover 13 is integrated with the housing 1 by being fixed to the housing 1 with a fixing screw 14 or the like. The lid 13 also functions as a guide bar presser, and presses and fixes the guide bar 5 to the housing 1. As shown in FIG. 1, an endless saw chain 6 is wound around the sprocket wheel 12 and the guide bar 5. A guide groove 5a is formed around the guide bar 5, and the inner periphery of the saw chain 6 is slidably fitted into the guide groove.

When the motor 7 starts and the motor shaft 7a rotates, power is transmitted to the sprocket hole 12 via the pinion 10 and the gear 11, and the saw chain 6 moves around the guide bar 5 as shown in FIG. Travel in the direction. The saw chain 6 travels along the non-cutting traveling path 6a above the guide bar 5 in the direction of the arrow toward the tip of the guide bar 5, and turns at the tip of the guide bar 5 to cut the cutting path 6b below the guide bar 5. Travel in the direction of the arrow and move the sprocket wheel 12
Turns around and heads again toward the non-cutting traveling path 6a.
In this way, the saw chain 6 continuously travels around the guide bar 5 and the sprocket wheel 12, and the cutting path 6
Work is cut when traveling in b.

When the chain saw is driven, the motor 7 generates heat. In order to cool the motor 7, as shown in FIGS. 3 and 4, a cooling fan 15 is fixed to the motor shaft 7a in front of the gear box 9. . The cooling fan 15 is constituted by a centrifugal fan for quietly blowing air. 2 to 4
As shown in FIG.
6 are formed. Also, a cooling fan 1 which is a centrifugal fan
A cooling air exhaust port 17 is formed on the lower surface of the housing 1 so as to correspond to the outer periphery of the fifth blade 15a. When the motor 7 is started, the cooling fan 15 rotates with the rotation of the motor shaft 7a.
Rotates to suck the outside air into the housing 1 from the outside air intake 16. After cooling the motor 7, a part of the outside air is discharged from the housing 1 through the exhaust port 17, and another part is sent from the wind window 18 to the saw chain 6 as described later. In this chain saw, since a centrifugal fan is employed as the cooling fan 15, noise caused by air blowing is reduced.

In order for the saw chain 6 to smoothly and continuously travel around the guide bar 5 and the sprocket wheel 12, it is necessary to supply lubricating oil to the contact portion between the two. (Not shown). As shown in FIG. 1, a discharge hole 19 for discharging the lubricating oil sent from the lubricating oil supply device to the saw chain 6 side is provided at a position in contact with the guide bar 5 of the housing 1. The discharge hole 19 faces the non-cutting traveling path 6a of the saw chain 6 in the guide bar 5, and the guide bar 5 is formed with a suction hole 20 near the discharge hole 19 for guiding lubricating oil to the guide groove 5a. ing. When the chain saw is driven, the lubricating oil supply device feeds the lubricating oil to the discharge hole 19 of the housing 1, and the lubricating oil discharged from the discharge hole 19 flows into the guide groove 5 a from the suction hole 20, and the non-cutting traveling It adheres to the saw chain 6 on the path 6a and is carried by the saw chain 6 to the entire circumference of the guide groove 5a and the teeth of the sprocket wheel 12.

As described above, the work is cut by the saw chain 6 traveling on the cutting travel path 6b. In order to discharge chips generated at that time to the outside of the housing 1, the saw chain 6 is cut as shown in FIGS. 6 is separated from the motor 7 and the cooling fan 15 by a partition 21 integral with the housing 1, and as shown in FIGS. 1 to 3, at the bottom of the housing 1 corresponding to the end of the cutting travel path 6 b of the saw chain 6. A chip discharge hole 22 is provided, and as shown in FIGS. 1, 4 and 5, the saw chain 6 is moved from the cutting path 6b to the non-cutting path 6.
A chip guide rib 23 for directing chips toward the chip discharge hole 22 is provided behind the curved traveling path 6c that changes the direction to “a”.

The partition 21 also serves as an end wall of the gear box 9.
Chips are prevented from entering the gear box 9 and the motor housing. The partition 21 surrounds the periphery of the saw chain 6 and the sprocket wheel 12 together with the lid 13 to prevent chips from scattering around.

As shown in FIG. 1, the chip guide ribs 23 are inclined so as to repel chips scattered backward in the housing 1 to the chip discharge holes 22. The chip guide ribs 23 are specifically formed on the lid 13 side and the partition 21 side, but may be formed on either the lid 13 or the partition 21.

The chip discharge hole 22 is formed to be elongated in the front-rear direction at the boundary of the bottom of the housing 1 with the lid 13, and is provided with chips carried by the saw chain 6, the partition 21, the lid 13, the chip guide rib 23, and the like. The bouncing chips are discharged out of the housing 1.

Since the saw chain 6 travels from the cutting traveling path 6b to the non-cutting traveling path 6a via the curved traveling path 6c, a part of the chips also tends to go to the non-cutting traveling path 6a. As described above, since the discharge hole 19 and the suction hole 20 for the lubricating oil are provided on the non-cutting traveling path 6a, these holes 19, 20 are provided.
If clogging is caused by the entry of chips, lubrication of the saw chain 6 and the like is hindered. In order to direct the chips toward the chip discharge hole 22, the chain saw includes a wind window 18 for blowing out the exhaust of the cooling air generated by the cooling fan 15, which is the centrifugal fan, toward the saw chain 6. In the inner partition 21.

The wind window 18 is provided above the partition 21. As shown in FIGS. 1, 3 and 5, particularly, above the place where the saw chain 6 turns from the cutting path 6b to the non-cutting path 6a. It is provided at the corresponding position. As shown in FIG. 3, between the outer wall of the housing 1 and the side wall of the gear box 9, a wind window 18 is provided from the outer peripheral side of the blade 15a of the centrifugal fan.
Is formed. The exhaust of the cooling air flowing in the centrifugal direction from the centrifugal fan passes through the passage 24 and the wind window 1
8, the cutting path 6a together with the saw chain 6
The chips that are going to enter the box are pushed back toward the chip discharge holes 22. A curved surface 25 is formed in the passage 24 at a position facing the blade 15 a of the centrifugal fan, and the exhaust of the cooling air is guided by the curved surface 25 and flows smoothly.

As shown in FIG. 5 and FIG.
8 is formed in the partition wall 21 so as to be inclined toward the chip discharge hole 22. As a result, the exhaust gas blown out from the wind window 18 is guided to the lower side where the chip discharge holes 22 are present, so that the chips flow toward the chip discharge holes 22 more efficiently. More preferably, as shown in FIG.
The wind guide wall 18 b of the wind window 18 is a curved traveling path 6 of the saw chain 6.
It is formed so as to incline to the rear of c. This allows
Since the exhaust air blown out from the wind window 18 is guided further rearward than the rear end of the saw chain 6, the chips are more effectively prevented from entering the lubricating oil discharge holes 19 on the non-cutting traveling path 6a.

<Embodiment 2> As shown in FIGS. 8 and 9, between the outer wall of the housing 1 and the side wall of the gear box 9 in this chain saw, a wind window 18 is formed from the outer peripheral side of the blade 15a of the centrifugal fan. A passage 24 for communicating wind is formed. As shown in FIG. 8, the blades 15a of the centrifugal fan overlap when viewed in the axial direction of the centrifugal fan. A concave portion 26 is formed on the outer wall of the gear box 9 corresponding to the entrance of the passage 24, and a vertical wall portion 26 a of the concave portion 26 continues to the inner wall surface of the passage 24.

The exhaust of the cooling air flowing in the centrifugal direction from the cooling fan 15, which is a centrifugal fan,
To turn into the passage 24. This makes it easier for the exhaust to flow toward the wind window 18,
By blowing out from the wind window 18, chips that are going to enter the non-cutting traveling path 6 a together with the saw chain 6 are directed toward the chip discharge holes 22.

[0025]

According to the first aspect of the present invention, a motor for driving the saw chain and a cooling fan for sending cooling air to the motor are provided in the housing, and the housing is provided between the saw chain and the motor and the cooling fan. A chip discharge hole is provided at the bottom of the housing corresponding to the end of the cutting path of the saw chain, and a wind window for blowing out the cooling air toward the saw chain is provided at the top of the partition. In the provided chain saw, since the cooling fan is a chain saw constituted by a centrifugal fan, the motor can be cooled and the chips can be discharged more quietly. In addition, since the wind speed can be easily increased, the chip discharging effect can be further enhanced. Furthermore, the installation position of the wind window can be selected more widely, and the degree of freedom in design increases.

According to the second aspect of the present invention, the wind window is located at a position corresponding to the outer periphery of the blade of the centrifugal fan, and at a position corresponding to the position above the point where the saw chain turns from the cutting travel path to the non-cutting travel path. , Chips can be forcibly directed to the chip discharge holes, and chips can be efficiently discharged out of the housing. In addition, since chips can be prevented from entering the non-cutting traveling path side of the saw chain, clogging of the lubricating oil discharge holes and the like can be prevented.

According to the third aspect of the present invention, since the wind guide wall of the wind window is inclined toward the chip discharge hole, it is possible to more effectively prevent chips from entering the non-cutting road side of the saw chain. In addition, clogging of the lubricating oil discharge hole and the like can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a chain saw according to the present invention.

FIG. 2 is a partially cutaway bottom view of the chain saw.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a front view of a partition.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is an elevational view showing a chain saw according to another embodiment of the present invention with a housing on one side removed.

FIG. 9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 6 ... Saw chain 6a ... Saw chain non-cutting running path 6b ... Saw chain cutting running path 7 ... Motor 15 ... Cooling fan 15a ... Blade 18 ... Wind window 18a ... Wind guide wall 21 ... Partition wall 22 ... Chip discharge hole

Claims (3)

[Claims] A motor for driving a saw chain and a cooling fan for sending cooling air to the motor are provided in a housing, and the saw chain is separated from the motor and the cooling fan by a partition wall integral with the housing. A chip discharge hole is provided at the bottom of the housing corresponding to the terminal end of the traveling path, and a wind window for blowing the exhaust of the cooling air toward the saw chain is provided at the top of the partition wall. A chain saw comprising a centrifugal fan. 2. The chain saw according to claim 1, wherein the wind window is provided at a position corresponding to a position above a point where the saw chain turns from the cutting travel path to the non-cutting travel path. 3. The chain saw according to claim 1, wherein the wind guide wall of the wind window is inclined toward the chip discharge hole.