JPH08105465A - Flywheel brake for vertical shaft engine - Google Patents

Abstract

PURPOSE: To stop inertia rotation of a fly wheel in a short time by sufficiently increasing the pressure contact force of a brake shoe and to eliminate the occurrence of deviation between operation of a brake switch and actual brake operation. CONSTITUTION: A brake body 14, a brake lever 16, and a part 17 to be touched with which the switch member 26 of a brake switch 25 makes contact are integrally formed. The rotation support shaft 19 of the brake body 14 is positioned downstream of the rotation direction A of a fly wheel from a brake shoe 15 and the part 17 to be touched is positioned upper stream of the rotation direction A of a fly wheel 5 from the brake shoe 15. The brake switch 25 comprises a switch member 26 formed of a conductive resilient plate; and an insulation support member 28 to support the part closer to the base end of the switch member 26. The tip part 26b of the switch member 26 is moved over the upper surface of the part 17 to be touched of the brake body 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical wheel flywheel brake mounted on a lawn mower or the like.

[0002]

2. Description of the Related Art In the above lawnmower and the like, a flywheel brake has been conventionally used in order to quickly stop the inertial rotation of the flywheel after the engine is stopped. A flywheel brake of this type is proposed by the applicant of the present invention, for example
The one disclosed in Japanese Patent No. 9223 is known.

As shown in FIG. 4, a brake shoe 55 is fixed to the inner surface of a brake band 51, one end of the brake band 51 is pivotally supported by a support shaft 59, and the other end of the brake lever 56 is fixed. The brake shoe 55 is constructed so that it can be pressed against the outer peripheral surface 5b of the flywheel 5 of the vertical axis engine E by pulling at the action point portion 56b.
Is urged toward the brake operation side by the tension spring 20, and the brake lever 56 can be operated toward the brake release side by the operation lever 30 against the urging force of the tension spring 20. A brake switch (not shown) is provided so as to interlock with the operation lever 30,
By operating the operating lever 30 to the brake operating side, the brake switch is grounded to stop the fuel supply.

[0004]

In the above-mentioned conventional example, one end of the brake band 51 is pivotally supported by the support shaft 59, and the other end is pulled by the action point portion 56b of the brake lever 56, whereby the brake shoe 55 is vertically moved. The brake shoe 5 has a structure in which the outer peripheral surface 5b of the flywheel 5 of the shaft engine E is pressed.
The pressure contact force of No. 5 cannot be increased sufficiently. In other words, the pressure contact force of the brake shoe 55 depends on the action point portion 56.
Since it acts as a component of the tensile force of b, only a pressure contact force much smaller than the tensile force is obtained, and there is a possibility that the flywheel cannot be stopped in a short time after the engine is stopped.

The brake switch is an operating lever 30.
Is configured to be grounded by operating the brake switch to the brake operation side, the brake switch is grounded regardless of whether or not there is "play" between the operation lever 30 and the brake band 51. That is, there is a possibility that a difference may occur between the operation of the brake switch and the actual operation of the brake.

The present invention has been made in consideration of such circumstances, and the pressure contact force of the brake shoe is sufficiently increased to
It is a technical subject to stop the inertial rotation of the flywheel in a short time and prevent a deviation from occurring between the operation of the brake switch and the actual operation of the brake.

[0007]

In order to solve the above problems, the present invention is configured as follows. That is, the brake base frame 11 is fixed to the engine main body 1, and one end of the brake main body 14 is horizontally rotatably supported by the brake base frame 11 via the rotary support shaft 19, and the brake lever 16 pulls a spring. The brake shoe 15 fixed to the brake body 14 can be pressed against the outer peripheral surface 5b of the flywheel 5 by urging the brake lever 20 toward the brake operation side, and the brake lever 16 can be moved to the brake release lever 18 as well.
In the flywheel brake of the vertical axis engine, which is configured to be operable on the brake release side against the urging force of the tension spring 20 via the, and provided with the brake switch 25 that is grounded when the flywheel brake is in the operating state. The brake main body 14, the brake lever 16, and the contacted portion 17 with which the switch member 26 of the brake switch 25 comes into contact are integrally formed, and the rotation support shaft 1 of the brake main body 14 is formed.
9 is positioned on the lower side of the rotation direction A of the flywheel 5 with respect to the brake shoe 15, and the contacted portion 17 is positioned on the upper side of the rotation direction A of the flywheel 5 with respect to the brake shoe 15. The switch 25 is made of a conductive elastic plate material, and has a switch member 26 in which a lead wire 27 is connected to a base end portion 26a thereof and an insulating member fixed to the brake base frame 11 to support the switch member 26 near the base end. It is characterized in that it is composed of a support member 28, and that the tip end portion 26b of the switch member 26 can ride on the upper surface of the contacted portion 17 of the brake main body 14.

[0008]

According to the present invention, the brake main body 14 and the brake lever 16 are integrally formed, and the rotation support shaft 19 of the brake main body 15 is located on the lower side of the rotation direction A of the flywheel 5 with respect to the brake shoe 15. Since the vertical axis engine E is located near the cylinder block 2, when the flywheel brake 10 is actuated, the brake shoe 15
Is strongly pressed in a direction to bite into the outer peripheral surface 5b of the flywheel 5. That is, even if the urging force of the tension spring 20 is the same as that of the conventional example, the pressure contact force of the brake shoe 15 is significantly larger than that of the conventional example. As a result, the inertial rotation of the flywheel 5 can be stopped in a short time after the engine is stopped.

The contacted portion 17 where the brake body 14 and the switch member 26 of the brake switch 25 contact each other
Are integrally formed, and the contacted portion 17 is connected to the brake shoe 15
Since the flywheel 5 is located on the upper side of the rotating direction A and the brake switch 25 is configured to allow the tip end portion 26b of the switch member 26 to ride on the upper surface of the contacted portion 17 of the brake body 14, When the flywheel brake 10 is actuated, the brake body 14 pivotally supported by the rotation support shaft 19 is biased toward the brake operation side by the tension spring 20 and horizontally rotated, and the tip end portion 26b of the switch member 26 is braked. The grounding operation is performed by riding on the upper surface of the contacted portion 17 of the main body 14. As a result, it is possible to eliminate the occurrence of a deviation between the operation of the brake switch and the actual operation of the brake.

[0010]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 shows a flywheel brake according to an embodiment of the present invention. FIG. 1A is a perspective view of the flywheel brake, and FIG. 1B is a plan view of the flywheel brake. 2 is a plan view of an air-cooled vertical axis engine equipped with the flywheel brake of the present invention, and FIG. 3 is a schematic side view of the engine. 2 and 3, reference numeral 1 is an engine body, 2 is a cylinder block, 3 is a power takeoff shaft for rotating a rotary blade (not shown), 5 is a flywheel, 5a is a fan blade of a flywheel fan, and 6 is A ring gear for starting rotation, 7 is a fan cover, 8 is a fuel tank, and 10 is the entire flywheel brake.

Flywheel brake 1 according to this embodiment
As shown in FIGS. 1 to 3, reference numeral 0 denotes a brake base frame 11 fixed to the engine body 1 of the vertical axis engine E, and a pivot support shaft 19 pivotally supports the brake base frame 11 so as to be horizontally rotatable. The brake body 14, the tension spring 20 for urging the brake lever 16 formed integrally with the brake body 14 toward the brake operating side, the brake release lever 18 formed separately from the brake body 14, and the brake release lever 18 And a brake switch 25 for grounding the flywheel brake 10 when the flywheel brake 10 is in an operating state. The brake shoe 15 fixed to the main body 14 is pressed against the outer peripheral surface 5b of the flywheel 5 of the vertical axis engine E so as to press the flywheel 5
Is configured to stop rotating, and the brake release lever 18 is configured to movably project from the lateral hole 7a of the fan cover 7.

As shown in FIGS. 1 (A) and 1 (B), the brake base frame 11 has a locking tool 11c on one end side of the tension spring 20.
The wire locking tool 12 and the stopper 13 that restricts the horizontal rotation of the brake body 14 are integrally formed.
The brake main frame 14 is attached to the brake base frame 11.
And brake release lever 18 and brake switch 25
And one end portion 11a of the brake base frame 11 is fixed to the left side surface of the engine body 1 and the other end portion 11b is fixed to the base end portion of the cylinder block 2 of the engine body 1. The main body 1 is detachably fixed to the cylinder block 2 side.

The brake body 14 has a fixed piece portion 14a to which a brake shoe 15 is fixed, and a tension spring 20.
The brake lever 16 whose one end is locked and the contacted portion 17 with which the switch member 26 of the brake switch 25 comes into contact are integrally formed. The brake main body 14 has its rotation support shaft 19 positioned on the lower side of the brake shoe 15 in the direction A of rotation of the flywheel 5 and closer to the cylinder block 2, and the contacted portion 17 has the contacted portion 17 thereof.
On the other hand, the flywheel 5 is located on the upper side of the rotation direction A, and is horizontally pivotally supported by the brake base frame 11 via a pivot shaft 19.

When the flywheel brake 10 is actuated, the brake lever 16 formed integrally with the brake main body 14 is urged toward the brake operation side by the tension spring 20, and the brake shoe 15 fixed to the brake main body 14 is released. The outer peripheral surface 5b of the flywheel 5 is pressed. In this way, by arranging the rotation support shaft 19 of the brake body 14 on the lower side of the rotation direction A of the flywheel 5 with respect to the brake shoe 15, the brake shoe 15 bites into the outer peripheral surface 5 b of the flywheel 5. Is strongly pressed against. Therefore, even if the urging force of the tension spring 20 is the same as that of the conventional example, the pressure contact force of the brake shoe 15 is significantly larger than that of the conventional example. As a result, the inertial rotation of the flywheel 5 can be stopped in a short time after the engine is stopped.

The brake release lever 18 is pivotally supported by the brake base frame 11 via a lever support shaft 21 so as to be horizontally rotatable, and its short arm portion 18a engages with the brake lever 16 and its long arm portion. Reference numeral 18b projects movably from the lateral hole 7a of the fan cover 7. Brake release lever 18
2 is located below the fan blades 5a of the flywheel fan 5, the lateral holes 7a of the fan cover 7 are also opened below the fan blades 5a of the flywheel 5, as shown in FIG. There is.

The long arm portion 18 of the brake release lever 18
An operation wire 22 is locked to b, and is pulled and locked to the brake release side by the operation lever 30 during engine operation. Reference numeral 23 is a wire tube. That is, by releasing the brake release lever 18 via the operation wire 22 by the operation lever 30, the brake lever 16 can be operated to the brake release side against the biasing force of the tension spring 20.
As described above, when the operation wire 22 is locked to the long arm portion 18b of the brake release lever 18 to release the brake, even if the tension spring 20 is strengthened to enhance the braking force, According to the principle, the operation wire 22 can be pulled with a weak force.

The brake switch 25 is fixed to the brake base frame 11 and a switch member 26 in which a conductive elastic plate material is formed into an L shape in plan view and a lead wire 27 is connected to a base end portion 26a thereof. , And an insulating support member 28 for supporting the switch member 26 near the base end. The switch member 26 formed in an L shape acts as an elastically deformable leaf spring and is bent downward.
The front end portion 26b of the contact portion 1 of the brake body 14 is
It is configured to be able to ride on the upper surface of 7. When the flywheel brake 10 is actuated, the brake main body 14 pivotally supported by the rotation support shaft 19 is biased toward the brake operation side by the tension spring 20 and horizontally rotated, and the switch member 2
The tip end portion 26b of 6 rides on the upper surface of the contacted portion 17 of the brake main body 14 to perform a grounding operation. As a result, it is possible to eliminate the occurrence of a deviation between the operation of the brake switch 25 and the actual brake operation.

Except for one end 11a of the brake base frame 11 and the brake release lever 18, the brake body 14, the brake shoe 15, the brake lever 16, and the tension spring 2 are provided.
0 and the brake switch 25 are covered with the fan cover 7. As a result, the fan cover 7 does not largely project to the lateral side, and the lateral hole 7a of the fan cover 7 is prevented.
Since the long arm 18b of the brake release lever 18 suffices to have a minimum size such that the long arm 18b projects movably, the cooling effect is halved even if the cooling air generated by the fan leaks out from the lateral hole 7a. Nor.

The operation of the apparatus of the above embodiment will be described below. First, during operation of the engine, the operation lever 30 is pulled and locked to the brake release side, whereby the brake lever 16 is positioned on the brake release side via the operation wire 22 and the brake release lever 18. As a result, the brake body 14 and the brake shoe 15 are separated from the outer peripheral surface 5b of the flywheel.

When the engine is stopped, the pulling / locking of the operating lever 30 is released. This operating lever 30
Is pulled toward the brake action side by the tension spring 20 via the operation wire 22, the brake release lever 18 and the brake lever 16, and in conjunction with this operation, the switch member 26 of the brake switch 25 causes the contacted portion 17 of the brake body 14 to contact. It comes into contact with the ground and becomes grounded, and the fuel supply is stopped.

On the other hand, the brake shoe 15 presses the outer front surface 5b of the flywheel 5 in parallel with the operation of stopping the engine. That is, the brake shoe 15 is strongly pressed in the direction to bite into the outer peripheral surface 5b of the flywheel 5, and the pressure contact force is significantly larger than that in the conventional example. This allows
After the engine is stopped, the inertial rotation of the flywheel 5 is stopped in a short time.

In the above embodiment, the air-cooled vertical axis engine is exemplified, but the present invention is not limited to this, and other types of engines can be appropriately modified and implemented.

[Brief description of drawings]

1 shows a flywheel brake according to an embodiment of the present invention, FIG. 1A is a perspective view of the flywheel brake, and FIG. 1B is a plan view of the flywheel brake.

FIG. 2 is a plan view of an air-cooled vertical axis engine equipped with the flywheel brake of the present invention.

FIG. 3 is a schematic side view of the engine.

FIG. 4 is a plan view of an air-cooled vertical axis engine according to a conventional example.

[Explanation of symbols]

E ... Vertical axis engine, 1 ... Engine body, 2 ... Cylinder block, 5 ... Flywheel, 5b ... Flywheel outer peripheral surface, 10 ... Flywheel brake, 11 ... Brake base frame, 14 ... Brake body, 15 ... Brake shoe , 16
... Brake lever, 17 ... Brake body contacted part, 18
... brake release lever, 19 ... pivot shaft, 20 ... tension spring, 25 ... brake switch, 26 ... switch member, 26a ... switch member base end, 26b ... switch member tip end, 28 ... insulating support member, A ... Flywheel rotation direction.

Claims (1)

[Claims] 1. A brake base frame (11) is fixed to an engine body (1), and one end of the brake body (14) is horizontally rotated to the brake base frame (11) via a pivot shaft (19). The brake shoe (15) fixed to the brake body (14) of the flywheel (5) is rotatably supported and the brake lever (16) is biased toward the brake operation side by the tension spring (20). Outer peripheral surface (5b)
The brake lever (16)
Via the brake release lever (18) so that it can be operated on the brake release side against the biasing force of the tension spring (20), and a brake switch (25) is provided that grounds when the flywheel brake is in operation. In the flywheel brake of the vertical axis engine configured as above, the contacted portion (17) where the brake body (14), the brake lever (16) and the switch member (26) of the brake switch (25) come into contact with each other.
And are integrally formed, and the rotation support shaft (19) of the brake body (14) is attached to the brake shoe (15).
To the lower side of the flywheel (5) in the direction of rotation (A), and the contacted portion (17) is superior to the direction of rotation (A) of the flywheel (5) with respect to the brake shoe (15). Located on the side, the brake switch (25) is made of a conductive elastic plate material, a switch member (26) in which a lead wire (27) is connected to a base end portion (26a) thereof, and the brake base frame (11). ), And an insulating support member (2) that supports the switch member (26) near the base end.
8), and the tip end portion (26b) of the switch member (26) is configured to be able to ride on the upper surface of the contacted portion (17) of the brake main body (14), and the vertical axis engine characterized by the above Flywheel brake.