JPH0223856Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an eccentrically adjustable shaft joint that is useful when applied to equipment that requires high-speed, high-precision control, such as machine tools, robots, and OA equipment.

BACKGROUND TECHNOLOGY Flexible shaft joints have conventionally been used as shaft joints that can absorb eccentric deviation angles between rotating shafts. Flexible shaft joints include elastic flexible shaft joints, gap flexible shaft joints, etc. Also, they can absorb eccentricity and declination simultaneously or separately, making centering easy. Moreover, they are highly rigid and can withstand vibrations and shocks due to gear presses. The applicant has previously filed an application for a highly versatile eccentric universal shaft joint that does not cause this problem (Utility Model Registration Application No. 204064, 1985).

Problems to be solved by the invention The above-mentioned conventional flexible shaft joints have weak torsional rigidity and a large gap, which causes difficulties in high-precision positioning and resonance during high-speed operation. In the eccentric shaft joint, the sliding or rotating surface of the cross pin 7 undergoes intense piston motion or rotational motion during high-speed rotation, so the frictional heat increases and the cross pin 7 or the bearings 8 and 9 that support the cross pin 7 are heated. Significant wear.

Therefore, the present invention provides an eccentric adjustable shaft joint that has strong torsional rigidity and a small gap, and which enables air cooling of the cross pin and eliminates the above-mentioned drawbacks of the conventional eccentric shaft joint.

Means for Solving the Problems This invention solves the above-mentioned problems, and its contents will be explained below using drawings corresponding to embodiments.

Bearing arms 5, 6 are provided in a cross shape so that they can be freely attached and detached on the inner facing surfaces of the hubs 3, 4 which are fixed to the ends of the rotating shafts 1, 2 to be connected, respectively, and support pins 17, 27 are arranged in the cross direction. Boss part 3
A cross pin 7 having an insertion hole 47 is connected to the cross pin 7 through bearings 8 and 9 that can rotate and slide freely, and a gap is provided between the hubs 3 and 4 and the bearing arms 5 and 6 that face each other. In the eccentric/declination adjustable shaft joint in which a is provided to absorb eccentricity and declination between the rotating shafts 1 and 2, each of the support pins 17 and 27 of the cross pin 7 communicates with the insertion hole 47 of the boss portion 37. Through-holes 10 and 11 are drilled to allow air to flow through the center insertion hole 47 through centrifugal force during high-speed rotation, and each support pin 1
A technical means is adopted in which the air passes through the through holes 10 and 11 of the pins 7 and 27 and cools and protects the support pins 17 and 27.

Function Since this device has the above structure, the rotation of the rotating shaft 1 is transmitted from the hub 3 to the bearing arm 5 to the bearing 8 to the cross pin 7, and from the cross pin 7 to the bearing 9 to the bearing arm 6 to the hub 4 to the rotating shaft. During this time, the eccentric movement that occurs between the rotating shafts 1 and 2 is absorbed by the cross pin 7 sliding in the radial direction via the bearings 8 and 9, and the angular movement is absorbed by the cross pin 7 sliding in the radial direction via the bearings 8 and 9. Rotation (oscillation) via 8 and 9
The eccentricity and declination between the rotating shafts 1 and 2 are absorbed by the repeated sliding and rotational movements of the cross pin 7 via the bearings 8 and 9.
Smooth rotation is transmitted while following the movement of the hubs 3 and 4.

Here, each support pin 1 of the cross pin 7 is
7, 27 and the bearings 8, 9 due to their rocking and rotation, resulting in high temperatures, but the centrifugal force caused by the high-speed rotation of the rotating shafts 1, 2 causes air to flow through the center insertion hole 47 of the cross pin 7. Since the air passes through the through holes 10 and 11 of each support pin 17 and 27, each support pin 17 and 27 is automatically cooled by the air. However, the cross pin 7 due to the eccentricity and declination absorption operation
Since the heat generation of the bearings 8 and 9 is alleviated and wear of these bearings is eliminated, highly accurate rotation transmission is always ensured.

Embodiment Hereinafter, one embodiment of the eccentrically adjustable shaft joint according to this invention will be described based on the drawings.

In the drawing, 1 and 2 are rotating shafts to be connected,
They are arranged on the same axis. Reference numerals 3 and 4 designate a pair of hubs, including a boss portion 23 for inserting and fixing the bearing arm mounting flanges 13 and 14 and the shaft ends of the rotating shafts 1 and 2;
24, and by inserting and fixing the boss portions 23 and 24 into the shaft ends of the rotating shafts 1 and 2 via keys 25 and 26, both the hubs 3 and 4 are made to face each other with a certain distance between them. It is something that forces you to do something. 5 and 6 are bearing arm mounting flanges 13 of the hubs 3 and 4;
The bearing arms 14 are provided in a cross shape on the opposing inner surfaces of the bearing arm mounting flanges 13 and 14, and their base ends are fitted into the straight grooves 18 and 19 cut in a cross shape on the opposing inner surfaces of the bearing arm mounting flanges 13 and 14 without play, and the tightening bolts 20, 21 so that it can be freely attached and detached, and has support holes 15 and 16 into which support pins 17 and 27 of a cross pin 7, which will be described later, are inserted and supported. 7 is a support pin 17, 2 in the cross direction.
7, and the boss portion 37 is a cross-shaped cross pin with an insertion hole 47 into which the shaft ends of the rotating shafts 1 and 2 can be loosely inserted, in order to provide sufficient strength for high torque transmission and forward and reverse rotation. The hubs 3 and 4 are integrally formed with no welded parts and have high rigidity.
opposing bearing arm mounting flanges 13,
The support pins 17, 27 on one side (left and right in the figure) are inserted into the support holes 15, 15 of the bearing arms 5, 5 on the hub 3 side (left and right in the figure), and the support pins 27 on the other side (top and bottom in the figure) , 27 are support holes 16, 16 of the bearing arms 6, 6 on the hub 4 side (upper and lower in the figure).
The hubs 3 and 4 facing each other are connected to each other via the cross pin 7 disposed between them.
8 and 9 are support holes 15 of the bearing arms 5 and 6,
16 and the support pins 17 and 27 of the cross pin 7, for example, a high-precision bush-shaped bearing using an oil-less bearing with lubricity such as plastic or oil-impregnated alloy. None, the cross pin 7 is connected to the support holes 15, 16 of the bearing arms 5, 6 by the bearings 8, 9.
The insertion and support of the support pins 17 and 27 are held airtight so that there is no play, and the hubs 3 and 4 facing each other are
A gap a is provided between the cross pin 7 and the bearing arms 5 and 6 to enable separate movements of the cross pin 7 and the hubs 3 and 4, and the bearings 8 and 9 support the sliding and rotational movements of the cross pin 7. This absorbs the eccentricity and deviation angle that occur between the rotating shafts 1 and 2. 10,
Reference numeral 11 denotes a through hole formed in each of the support pins 17 and 27 of the cross pin 7, which communicates with an insertion hole 47 formed in the boss portion 37 of the cross pin 7, so that air (cold air) is passed through the insertion hole 47 by centrifugal force caused by high-speed rotation. By forcefully passing through the through holes 10, 11 of each support pin 17, 27 from inside to outside,
7 and 27 are cooled. In the figure, reference numerals 28 and 29 are setscrews of keys 25 and 26 for fixing the rotating shafts 1 and 2 and the hubs 3 and 4.

In the above configuration, the rotation of the rotating shaft 1 is controlled from the hub 3, which is integrally fixed to the rotating shaft 1 via a key 25, to the bearing arms 5, 5, which are integrally fixed to the hub 3 by tightening bolts 20, 20. from the bearing arms 5, 5 to its support hole 1.
One support pin 17, 17 of the cross pin 7 is inserted and supported by bearings 8, 8 in 5, 15.
is transmitted to the cross pin 7 via the bearing arms 6, 6, and the bearings 9,
It is transmitted to the bearing arms 6, 6 through the other support pins 27, 27 of the cross pin 7, which is inserted and supported through the cross pin 9, and the bearing arms 6, 6 are fixed together by tightening bolts 21, 21. The power is transmitted from the hub 4 located in the hub 4 to the rotating shaft 2, which is integrally fixed to the hub 4 via a key 26.

In the above series of rotation transmission operations, the rotating shaft 1,
Eccentricity and deviation angle or eccentric deviation angle occurring between the cross pins 7 and 2 are absorbed by repeatedly sliding the cross pin 7 in the radial direction via the bearings 8 and 9 and rotating it in the circumferential direction. That is, the eccentric movement is absorbed by the support pins 17, 27 of the cross pin 7 sliding through the bearings 8, 9, and the eccentric movement is absorbed by the support pins 17, 27 of the cross pin 7 rotating through the bearings 8, 9. Eccentric and yaw movements are absorbed simultaneously by a combination of the absorption operations of the eccentric and yaw movements.

In addition, in the operation of absorbing eccentricity and declination, frictional heat is generated in the bearings 8, 9 and the support pins 17, 27 due to sliding and rotation, but air (cold air) is inserted through the bearings 8, 9 and support pins 17, 27 due to centrifugal force caused by high-speed rotation. Since it flows forcefully from the hole 47 through the through holes 10 and 11 of the support pins 17 and 27 from the inside to the outside, it is protected by cooling.

Effects of the invention As explained above, this invention is applicable to each support pin 1 of the cross pin 7 in an eccentric adjustable shaft joint.
It has a simple structure in which through holes 10 and 11 that communicate with the insertion hole 47 of the boss portion 37 are bored in the holes 7 and 27,
Since the generation of frictional heat between the bearings 8, 9 and the support pins 17, 27 during the operation of absorbing eccentricity and declination of the rotating shafts 1, 2 is prevented, highly accurate and efficient rotation transmission can be carried out over a long period of time. It can be applied to machine tools, robots, OA equipment, etc. that require high-performance control, etc., which are indispensable for high resolution requirements, and achieves unprecedented effects. In addition, the shaft coupling has a longer lifespan, maintains high performance for a longer period of time, and requires no maintenance.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is a cutaway front view taken along line A-A' in Fig. 2, and Fig. 2 is a front view taken along line B-B' in Fig. 1. 3 is a cutaway side view taken along line CC' in FIG. 1, FIG. 4 is a bottom view, FIG. 5 is a front view of the cross pin, and FIG. 6 is a side view thereof. 1, 2... Rotating shaft, 3, 4... Hub, 5, 6...
...Bearing arm, 7...Cross pin, 17, 27
... Support pin, 37 ... Boss portion, 47 ... Insertion hole, 8, 9 ... Bearing, 10, 11 ... Through hole.

Claims (1)

[Scope of utility model registration request] The hubs 3 and 4 fixed to the rotating shafts 1 and 2 have bearing arms 5 and 6 that can be freely attached and detached, support pins 17 and 27 in the cross direction, and the boss portion 37 has an insertion hole 47.
In a shaft joint in which a cross pin 7 having a perforated hole is connected to each other via bearings 8 and 9 that can freely rotate and slide so as to be able to absorb the eccentric deviation between the rotating shafts 1 and 2, each support pin of the cross pin 7 17 and 27 are provided with through holes 10 and 11 that communicate with the insertion hole 47 of the boss portion 37.