JPH03229019A - Transmission shaft coupling - Google Patents

Abstract

PURPOSE:To provide a stable coupling without eccentricity and slippin off by arranging both end parts of a coil spring outwards to cross through the center of winding, and inserting both the ends into a connection hole passing the shaft core of input and output shafts. CONSTITUTION:A coil spring of a coil spring coupling 1 is formed of spiral cylinder 4 and both end parts 2, 3. The end pars 2, 3 protrudes outward in a linear form passing through the center P of the cylinder 4 and cross at an angle theta (not 0 deg. or 180 deg.). Input and output shafts 7, 8 are arranged in an axial line and both end parts 2, 3 are inserted into a connection hole provided in each dia. direction. Since the angle is provided, eccentricity or slipping off is not generated in the coil spring thereby enabling stable transmission.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to a power transmission shaft coupling, for example, for coupling an input shaft on an engine side and an output shaft on a working machine side to transmit power. The embodiment shows a case where it is used in a power transmission path of a lawn mower. In addition to power transmission, it can also be used as a shaft coupling for operation interlocking mechanisms.

(Prior art and problems to be solved by the invention) In a shaft joint using a helical coil spring joint, the input shaft,
The connection between the output shaft and the output shaft is likely to come off, making the connection structure complicated.

(Means for Solving the Problems) The present invention provides both ends 2 of a helical coil spring joint 1.
3 pass through the center P of the winding diameter of this helical cylinder 4, have an intersection angle θ where they intersect with each other, approach the helical cylinder end face 5.6, and reach the outer circumferential direction, A connecting hole 9 between the input shaft 7 and the output shaft 8 formed in the radial direction through the shaft core.
．． 10 is inserted into the transmission shaft joint.

(Operations and Effects of the Invention) One end 2 of the coil spring joint 1 is inserted into the connection hole 9 of the input shaft 7, and the other end 3 is inserted into the connection hole 10 of the output shaft 8. Since the connection hole 9 inserted into the input shaft 7 and the connection hole 10 inserted into the output shaft 8 form an intersection angle θ, the coil The center position of the spring joint l is difficult to eccentric, and even if a gap is created between the helical cylindrical end surface 5.6 and the end portion 2.3 of the coil spring joint 1 due to changes in transmission load, etc., these ends 2.3 is the connecting hole 9.
It rarely falls outside of 10. Furthermore, stable transmission can be achieved.

(Example) In Figs. 1 to 3, the coil spring of the coil spring joint l is made by winding a wire with a circular cross section along a cylindrical shape of a constant diameter using a spring material. The coiled cylinder 4 has a wire wrapped part i''1111 and is pressed tightly by a spring. Both ends 2.3 of the coil spring joint 1 are connected to the - ) is a coiled i': it passes through the center of I4 (■) and protrudes linearly toward the outer periphery,
The front end 2 crosses and contacts the end surface 5 of the helical cylinder 4, and the rear end 3 crosses and contacts the end surface 6i.

Both ends 2 and 3 of this coil spring joint 1 are connected to a helical cylinder 4.
When viewed in the axial direction of the cylinder core, phase 1 is formed at this center P north.
1'' at a angle other than 0 degrees or 180 degrees to form an appropriate crossing angle O.

Input shaft 7 and output shaft 8 connected by this coil spring joint 1
A connecting hole 910 for passing through the end portion 2.3 is formed to extend diametrically through these axes, and the tip portion 2.
．． 3 from the helical cylinder end surface 5.6 against the spring, insert the input shaft 7 or the output shaft 8 into the spaced gap.
The input shaft 7 and the output shaft 8 are positioned at the center of the helical tube 4 through the distal end thereof.

The diameter of the input shaft 7 and the output shaft 8 from the connecting hole 9.10 to the tip end side is smaller than the inner diameter of the helical tube 4. A cylindrical body 11 is fitted into the cylindrical body 11, and the input shaft 7,
And the tip of the output shaft 8 may be fitted. In this case, when an overload is applied to the output shaft 8 during transmission, the coil spring joint 1 is prevented from coming into close contact with pressure beyond a certain level, and damage such as threading can be prevented.

In addition, in the zone system lawn mower, an engine 13 is installed in the upper center of the casing 12 that constitutes the main body in FIGS. Gauge foil rivers 8 are mounted on the cutting blade shaft 15, and are provided on both left and right sides of the front side, and are vertically adjustable around the support shaft 16 with respect to the casing 12 by the front wheel arm 17. G can be adjusted up and down freely using the rolling roller 19 or the transmission case 20, etc.
The control handle 21 protrudes rearward. 22
is a discharge path formed in the gauging 12, which discharges and guides the grass cut by the cutting blade 14 to the rear.

The transmission case 20 has an upper end supported so as to be rotatable back and forth around a transmission shaft 23 that protrudes laterally from the casing 12, and a shaft 24 of a roller 19 mounted on the lower end.
It is transmitted through a cheno 25 for 24 hours. 26 is a tension block that tensions this chino 25. The transmission case 20 and the front wheel arm 17 are connected by a rod 27, and the front wheel 18 and roller 19 are linked to move up and down with respect to the casing 12, thereby making it possible to adjust the cutting height and the like. 28 is a stopper that locks the adjustment angle of the front wheel arm 17.

An input shaft 7 protrudes from the rear of the engine 13, a transmission case 29 is provided in the casing 12 on the rear side, and an output shaft 8 protrudes along the S concentric line with the input shaft 7. .8 between coil spring joints 1 as described above.
Concatenate. The transmission shaft 23 is configured to rotate in conjunction with the transmission case 29 via a bevel gear mechanism. or,
A sprocket 30 is provided on the output shaft 23 portion in the transmission case 20 so as to rotate via a ratchet 31,
The chino 25 is stretched between this sprocket 30 and the sprocket 32 on the shaft 24 of the roller 19 to transmit power,
When rotating the roller 19 forward, the configuration is such that no transmission rotation to the transmission shaft 23 is performed. Therefore, use the control handle 21 to raise the front wheel 18 side and drive the rear wheel 91.
When pushing forward (A) with only part 9 in contact with the ground, although the roller 19 and chain 25 are rotated, the transmission shaft and coil spring joint 1 are not rotated by the ratchet 31, so this coil spring The joint 1 is not forcibly rotated in an overloaded state, and safety can be maintained.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a partial front view, Fig. 2 is a side view thereof, Fig. 3 is a side view showing the connected state, and Fig. 4 is a side view of the lawn mower. FIG. 5 is a plan view showing a part of the transmission mechanism. (Explanation of symbols) Coil spring joint 2 End 3 End 4-) Helical end surface of coiled cylinder [Helical end surface 7 Human power shaft
8 Output shaft? ] Connecting holes 10 Connecting holes 1 Applicant name Representative of Iseki Agricultural Machinery Co., Ltd. Water 1) Song Jiu Figure 1 Figure 2 Ge/l ρ Figure 3

Claims (1)

[Claims] Both ends 2 and 3 of the helical coil spring joint 1 pass through the center P of the winding diameter of the helical cylinder 4, and have an intersection angle θ where they intersect with each other. , 6 toward the outer periphery, and are inserted through connection holes 9 and 10 of an input shaft 7 and an output shaft 8 formed radially through the shaft core.