JPS6246748B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damper joint that has the function of absorbing and mitigating vibrations, shocks, etc. transmitted to a power shaft.

In general, when transmitting rotational torque from the prime mover to the drive shaft in vehicles (four-wheeled vehicles, two-wheeled axles), etc., rubber, etc. Countermeasures were taken such as interposing elastic joints, using metal springs in some parts of the clutch and transmission parts, and reducing play in each transmission part.

However, these metal springs and rubber joints do not provide sufficient cushioning properties against large torque fluctuations and shocks, and they also lack damping effects against rotational vibrations, and there are also problems with durability, responsiveness, etc. is left behind.

In addition, as disclosed in Japanese Utility Model Application No. 50-97150, there is a power transmission device equipped with a buffer spring and a cylindrical damper, but it has the disadvantage of being quite complex in structure and expensive. .

The present invention was proposed in order to solve this problem, and is a damper joint that converts a part of the rotational shock and vibration transmitted to the power shaft into axial motion, and efficiently absorbs and alleviates it. The purpose is to provide

Embodiments of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes a cylindrical rotating cylinder, and a power input helical gear 2 is integrally formed on the outer periphery of the cylinder. The rotational force (positive rotation) from the helical gear 2a attached to the output shaft of the primary reducer of the prime mover for power transmission that meshes with the helical gear 2 is transmitted to the helical gear 2.
The direction of the tooth trace (intersection line between the tooth surface and the pitch surface) is set so that a thrust force is generated to the left in the figure.

An output shaft 3 connected to a transmission or a drive shaft is disposed at the center of the cylinder 1, and this output shaft 3 passes through cylinder partitions 4a, 4b, bearing members 5a,
It is rotatably supported by 5b.

One of the partition walls 4a is in oil-tight sliding contact with the inner periphery of the cylinder and the output shaft 3, and therefore, although it is limited by the retaining rings 6a and 6b, the axially relative The other 4b constitutes a bearing member in a displaceable state, and the other 4b is connected to the cylinder 1.
The output shaft 3 is formed of a pair of members.
The serration portion (spline portion) 7 formed at the contact surface with the output shaft 3 engages with the output shaft 3 in the rotational direction, but is connected to the output shaft 3 in such a manner that relative displacement is possible in the axial direction. ing.

A piston 8 that slides on the inner circumferential surface of the cylinder is fitted into the output shaft 3 to separate two pressure chambers A and B filled with hydraulic oil into the cylinder 1 . The piston 8 is connected to the retaining ring 6b by a buffer spring 9.
is biased to engage.

The other end of the spring 9 is in pressure contact with a cylindrical disk-shaped spring seat 10, and the seat 10 is in contact with a sealing member 12 against the inner circumference of the cylinder and the outer circumference of the output shaft.
a and 12b, and normally comes into contact with the partition wall 4b due to the spring reaction force.

The piston 8 is formed with a through hole 13 that communicates between the pressure chambers A and B, and resists the movement of fluid from pressure chamber A to B and imparts a predetermined damping force. A damping valve 14 is provided which allows movement to with little resistance.

In this embodiment, the damping valve 14 has an orifice 1
5a, and a spring 15c that presses the annular valve 15b into contact with the through hole 13.

An annular sleeve 16 concentric with the output shaft 3 is integrally formed on the piston 8, and a stepped fitting cylindrical portion 17 is formed on the spring seat 10 in correspondence with the sleeve 16. When the cylindrical portion 17 is fitted into the sleeve 16 due to the relative displacement between the two, an oil lock is generated in the pressure chamber A.

A volume compensator 19 is provided in the pressure chamber B to compensate for volume fluctuations (expansion) of the hydraulic oil due to temperature changes.

Note that the bearing partition wall 4a engages with the retaining ring 6b via the disk spring 20, thereby alleviating the impact on the cylinder 1 during reverse rotation.

Next, the effects of the present invention will also be explained.

The input torque is transmitted via the helical gear 2,
Along with this, the cylinder 1 rotates and the serration section 7
The output shaft 3 rotates in the same direction as the cylinder 1 via.

By the way, when input torque is transmitted to the helical gear 2, a part of the rotational torque is converted into an axial thrust force in accordance with the tooth trace direction angle.

Therefore, during forward rotation, a moving force acts on the cylinder 1 to the left in the figure, and a gap between the piston 8 engaged with the output shaft 3 and the spring seat 10 engaged with the cylinder partition wall 4b is generated. While compressing the spring 9 installed in the cylinder 1, the cylinder 1 is displaced to the left to a position where the spring force and the thrust force are balanced.

When rotational torque is constantly input, the system is balanced as described above, and the input rotation is transmitted to the output shaft 3 without phase delay.

When there is a sudden torque fluctuation in the input rotation, for example, when the torque increases instantaneously, the thrust force increases accordingly, causing the spring 9 to move in the direction in which the pressure chamber A contracts. Cylinder 1 is further displaced while being contracted.

As a result, the oil pressure in the pressure chamber A increases, and a part of the hydraulic oil escapes to the expanding pressure chamber B through the orifice 15a of the damping valve 14, and at this time, the flow path resistance determined by the orifice 15a A damping force is generated according to the

In other words, when an instantaneous impact torque is input, it is converted into an axial motion and absorbed by the elastic force of the spring 9, and is also alleviated by the damping action of the damping valve 14, and the impact torque is applied to the output shaft 3. This reduces the transmission of impact forces.

When the above-mentioned impact torque becomes excessive, the amount of displacement of the cylinder 1 becomes large, and the cylindrical portion 1 of the spring seat 10
7 fits into the sleeve 16 of the piston 8 and seals the hydraulic oil in the pressure chamber A (eliminates escape), producing a so-called oil lock effect and buffering overload torque.

Next, when rotating in reverse (including during engine braking when transmitting vehicle drive torque),
The cylinder 1 tries to move to the right, but this is because the bearing partition 4a is held against the retaining ring 6b by the disc spring 20.
However, the disc spring 20 can moderate and absorb the impact to some extent.

However, although this embodiment is mainly aimed at absorbing shock during normal rotation, a symmetrical structure may be used to provide the same effect when rotating in reverse.

Note that when the torque decreases during normal rotation, the damping valve 14 is fully opened, so the hydraulic oil in the pressure chamber B becomes a so-called free flow and flows into the other pressure chamber A in a responsive manner. 1 is displaced so as to absorb the torque decrease, so that transmission of the instantaneous torque decrease to the output shaft 3 can also be alleviated.

Regarding expansion and contraction of the hydraulic oil due to temperature changes, the volume compensator 19 operates to absorb pressure fluctuations, so that the buffer characteristics can be maintained at a steady value.

As described above, according to the present invention, when instantaneous torque fluctuations occur in the process of transmitting rotational torque, that is, when rotational impact force or vibration occurs, it is absorbed and alleviated in a responsive manner and transferred to the output shaft. It can prevent transmission and has a good effect of absorbing repeated shocks.

In addition, since gears are used in principle to transmit rotational torque, not only is strength and durability good, but friction loss is small and transmission efficiency is also good.

In addition, since the output shaft is supported at both ends as a single structure, it is advantageous in terms of strength at high rotation speeds, and the overall size and weight can be reduced, so it can be said to be advantageous in terms of design economy in terms of bearing durability and strength. .

[Brief explanation of the drawing]

The drawings are cross-sectional views showing embodiments of the present invention. 1... Rotating cylinder, 2... Helical gear, 3...
... Output shaft, 4a, 4b ... Partition member, 7 ... Serration part (spline part), 8 ... Piston,
9...Spring, 10...Spring seat,
14... Damping valve, 16... Sleeve, 17... Fitting cylinder portion, A, B... Pressure chamber.

Claims (1)

[Claims] 1. An output shaft whose both ends are rotatably supported by bearing members, and an output shaft which is provided to be slidable in the axial direction with spline fitting and formed on a part of the outer peripheral surface of the output shaft. A cylinder that rotates when rotational torque is input through a helical gear, a piston that slides and fits between the outer circumferential surface of the output shaft and the inner circumferential surface of the cylinder, and a cylinder partition and a spring seat that are arranged on both sides of the cylinder. , two pressure chambers separated by the piston, and a one-way valve function provided on the piston to limit flow in one direction between these pressure chambers and allow free flow in the other direction. A damper joint consisting of a valve and a buffer spring interposed to counter the relative displacement of the cylinder and piston in the axial direction that occurs in response to input torque.