JPS61502139A - Bellows for fixed position joints - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Bellows for position-fixing joints The present invention is suitable for position-fixing joints that bellows for joints based on polyetherester Also of the type made of thermoplastic elastomer and having at least six folds. Regarding.

Before the bellows for fixed position joints, especially constant velocity rotating joints It is generally known that natural rubber or synthetic rubber and mixtures of both, and polyurethane Manufactured from raw materials. In this case the range of excursions was continuously expanded. Because this These bellows structures mainly protect joint shafts of automobile transmissions. In automobiles, it is desirable to keep the turning circumference as small as possible. This is because it is desired. Based on the condition that it can withstand deviations up to 5[f] Therefore, many demands are made on the bellows, and these demands are met by the bellows. Grease in the parts and extremely high rotational speeds for long periods of time. Generally about 8 to 1 km, which corresponds to a lifespan of 150,000 to 200,000 km. made even more demanding by having to maintain it for a period of 0 years become.

Another requirement is the usability of the bellows under extreme weather conditions. In other words, Rose can be used in both hot deserts and cold polar regions without aging. It is desired that it can also be used. In practice in the polar regions, low temperatures Therefore, very often cracks occur in the bellows, and cars with bellows The joints will wear out after a short period of time due to dirt entering through the holes. I could see that.

To withstand the conditions in cold regions, to solve this technical problem of cold weather. New materials were explored.

Therefore, very recently, polyether ester-based materials, which are extremely resistant to low temperatures, have been developed. It has been proposed to use a thermoplastic elastomer as the material. however This material has extremely small elasticity compared to conventional rubber-based raw materials. Therefore, it is easy to assemble and when used as a shaft sleeve. Due to its completely different properties, it is possible to form bellows from this material that meet the requirements. This requires special steps.

Therefore, the problem of the present invention is to create a material that is resistant to cold and hot temperatures. from elastomers based on extremely low temperatures such as those occurring in polar regions. The base has a long service life and can withstand the deviation of s+j' without damage even in It is to offer rose.

In order to solve this problem, in the configuration of the present invention, a fixed position jig that deviates up to 5(f) is used. Bellows for joints, thermoplastic based on polyetherester made of plastic elastomer and having at least six folds at least the front side of the first fold and in some cases the front side of the second fold. , the side of the device relative to the fold tip of 15:1 to 8:1 when viewed from the side opposite the joint. with a side wall thickness ratio of 6-1 to 4:1, with all other sides having a side wall thickness ratio of 6-1 to 4:1. The side of the tongue opposite the joint is usually the side with the smaller shaft diameter. Ru. Therefore, the folds in this area are also relatively small. tongue when bending the joint The arms are stretched at the outer corner of the bend and compressed at the inner corner of the bend.

In this case, in the area of small folds, the folds often mold directly into each other in the inner area, In the outer range of the bend, a fold extending along the lash axis at right angles to the fold part occurs. Im materials can withstand folding and overlapping, but especially in dynamic Polyether elastomers, however, have a significantly lower ductility under load. Materials like tomato are not tolerated. With such materials, overlapping seams and folds may occur. The sleeve is therefore certain to break within a short period of time.

The risk of folding can be prevented by increasing the number of folds, but On the other hand, at the same time, the probability that the sleeves will overlap in the inner range of the bend increases. This phenomenon also leads to sleeve failure in this material. In the present invention, this The overlapping fit is such that the side of the bellows tapers from the device to the tip of the fold. This is avoided in this case by having different taper ratios of the side surfaces. 1st The front surface of the folds is relatively thick in any case, and there are no overlaps between the folds. It has great resistance to. Same - Opposite sides of the folds are attached to the device. and has a significantly smaller wall thickness. In other words, when the joint is bent, this side Lean on the front side without covering the front side. Therefore, the anterior surface of the second fold is can lean against the posterior aspect of the folds, which also does not result in an overlap. .

In an advantageous embodiment of the invention, on the front side of the first fold and optionally the second fold, The side wall thickness lies between 2 and 3.5 nm over the range of the device. Other folds The side wall thickness in this case is preferably between 1.2 and 2.2 mm in the area of the device. are doing. That is, the wall thickness varies markedly, with the posterior surfaces of all the stubs being much thinner. The sleeve is designed to be easily deformable due to its 6D structure. overlap is reliably avoided.

In addition, the side wall thickness in the area of the fold tips is preferably between 0.2 and 0.4. This construction allows for high strength while maintaining the required strength. elasticity can be obtained.

example Thermoplastic polyester elastomer (Hytrel, a registered trademark of DuPont) A bellows with five pleats for a constant velocity rotating joint is based on the blow molding method. Manufactured. The inner diameter of the sleeve on the joint side is 80u1 and the inner diameter of the small sleeve is 25 m, and the wall thickness of the front side of the first fold is 2.5 mm in the area of the device and 0.4 mm at the tip of the fold. ytrx, the anterior surface of the second fold has a thickness of 2.2n in the area of the device, the fold tip It had a thickness of 0-35 m1 in the end region. All other aspects are equipment 1゛ in the range of , and 0-5tnx in the range of the 6n1 fold tip. there was.

The device between several folds was provided with load-relieving grooves. Also, the folds are below each other. They were arranged at the following angles: first fold, anterior aspect, angle β 26°; Posterior side, angle γ26°.

Second fold, anterior aspect, angle β32°, Posterior side, angle γ2f0 Third fold, anterior aspect, angle β64°, Rear side, angle γ29° Fourth fold, anterior surface, angle β33°, Posterior side, angle γ28°.

Last fold, anterior aspect, angle β61°, Posterior side, angle γ35°.

The ratio of width (B) to height H) is as follows: First fold i=1.0 Second fold station = i, is 6th fold, = 1.2 4th fold - g = 1.14 Fifth fold ox = 1.15 The manufacturing length of the bellows between the brim is 130 inches.

The installed length was 84 m. The following tests were carried out on these bellows: Ta: 1. Deformation characteristics during static deviation 2. Rotation test up to n=3200 minutes 3. Functional test during high temperature operation 4. Functional test at low temperature The shaft sleeve test stand consists of two pillars whose angle relative to each other can be adjusted. ° A drivable constant-velocity rotating joint equipped with a bellows is installed between the two columns. Attached. The tightening length of the bellows was 84 mm.

The joint was filled with 30.9 grease and the bellows was filled with 509 grease. . As the grease, "Mori Coach N2461C" was used.

The rotating test stand has stepless adjustment in the rotation speed range of 0...3500 min-1. A possible drive was provided.

The central axis of the test mandrel, on which the specimen was tightly assembled using a tightening belt, was 2fII. It was precisely adjusted to the zero point of the grid.

In this case, the flash frequency of the stroker is determined by the fact that each change in the shape of the sleeve is visible and measurable. The engine speed was matched to the rotational speed so that it could be determined and recorded photographically. each time The deformation in the rotation phase was measured after t=15 minutes.

Sleeve rotation speed stage 1600; 1800 for actual dimensions before inspection ;2000;2200;2400;2600;2800;3000; A diameter change at 3200 min-1 was detected. The test mandrel is ΔB=9515℃ was kept on top of an adjustable hot air blower at a constant temperature.

The table shows the dimensions of the shape change in the folds.

Diameter - increase The sleeves tested did not expand until n=2400 min-1. n=2400 Only after n=3200 min-1 did a slight expansion occur.

The bellows was not damaged at all and no grease leaked out.

high temperature test The bellows was brought to a temperature of 100°C. The shaft IJ-bending test stand has a bending angle of 2゛0°. The constant velocity rotation joint was operated for 240 hours at a rotation speed of 140 revolutions per minute. It was.

Two bellows underwent this test. Grease may leak out after 240 hours. There was no damage to the bellows.

low temperature test 40 bellows were brought to a temperature of -40°C. Constant velocity on shaft sleeve test stand The bending angle of the rotating joint is adjusted to 18°, and the rotation speed is 1100 times per minute for 15 minutes. It was kept in rotation. Afterwards, during the 60-minute downtime, the bellows is cooled again to -40°C. It was then run again for 15 minutes at 1100 rpm. Such a load After 20 alternations, all four samples showed no grease leakage or damage. I couldn't.

Service life and fatigue strength Two specimens were sequentially subjected to the following loads: a) temperature 45°C, joint deflection; 15°, rotation speed 1000 revolutions per minute, duration 200 hours, b) Temperature -65°C, joint deviation 15°, 300° from 0 to 1000 revolutions per minute rotation start, C) Temperature: 45°C, joint deviation: 30°, rotation speed: 250 revolutions per minute, duration: 4 hours while, d) Temperature -65°C, joint deviation 30°, starting 60 times from 0 to 250 revolutions per minute Movement, e) Temperature: 90°C, joint deviation: 42°, rotation speed: 20 revolutions per minute, duration: 4 hours , f) Temperature -35°C, joint deviation 42°, 15 starts from 0 to 20 revolutions per minute Movement, g) Temperature -40℃, joint deviation 5cf, 60 starts from 0 to 250 revolutions per minute Movement.

After this test, the bellows was found to have no grease leakage or damage that impairs its function. There wasn't. Slight wear was observed in the contact area of the folds. When the deviation angle is 10° The first contact occurs between the fifth and fourth folds, and the first contact occurs at a deflection angle of 17.5°. A second contact occurs between 4 and the third fold, and at an angle of deviation of 22.5, the third and third folds A sixth contact occurs between the second fold and between the second and first fold at 37.5 A fourth contact occurs at 40.5°, and all folds continuously contact did.

The invention will be explained below with reference to the drawings: FIG. 1 is a partially cross-sectional view of a constant velocity rotating joint equipped with a bellows; Fig. 2 is a front view partially showing the bellows in section, Fig. 6, Fig. 4, Fig. 5, and Figure 6 shows the constant velocity rotating joint with bellows according to the present invention being bent in different ways. Diagram showing location, Figures 7 and 8 show a constant velocity rotating joint with Bim bellows according to the prior art. FIG.

The constant velocity rotation joint 7 is located in a fixed position range 9 in which the shaft 10 is rotatably supported. It consists of The shaft 10 serves to receive the small collar 12 of the bellows 13. It has two annular protuberances 11. The collar 12 of the bellows 13 has both annular raised parts. 11 is held on the shaft 10 by a tensioning band 14. Similarly bellow The large flange 15 of the lens 13 also has an annular shape in the position fixing range 9 of the constant velocity rotation joint 7. It is fixed in the groove 1 with a tension band 14.

The front side 3 of the first fold 1 has a wall thickness of 6°20 in the region of the device 5, with a wall tip It tapers from 0-60zx towards 6. The front side 3 of the second fold 2 is the device 5 It has a wall thickness of 2.4011 in the range of and tapers to 0.40 m. No. The rear side 4 of the first fold 1 and the rear side 4 of the second fold 2 have equal dimensions in the area of the device 5. Hotsuma D has a length of 1.50 and tapers to 0.60 or O940wx. Ru. The device 5 on the front side 3 of the sixth fold 21 is 1.80n1 on the front side of the fourth fold 20 The device 5 on the face 3 is 1.65n1 the device on the front side 3 of the fifth fold 19 is 1° It is 40zx. The corresponding rear surfaces 4 are each 1°50i111 in the device 5. ;1.35mm;1-! l　O has the thickness of a butt wing.

The rear side 4 tapers to O-40wm; O-25im; 0.20wm, respectively. It has become.

An annular load-reducing groove 17 is arranged between several folds in the area of the device 5. , this load relief groove 17 facilitates contraction and expansion of the bellows.

Extension of the center line 8 of the position fixing range 9 of the constant velocity rotation joint 7 due to the deviation of the shaft 10 A bending angle α is formed between the line and the inclined axis 10. In Figure 3, this bending angle α is It is 10°. In this case, the folds bring about a first contact with each other, and in this case the fifth fold 19 and the fourth fold 20 are in contact with each other, and the bending angle α is 22.5° in FIG. Yes, in this case the fourth fold 20 is in contact with the third fold 21, and the sixth fold 21 is in contact with the third fold 21 at this time. It makes contact with the second fold 2 for the first time.

In FIG. 5, the bending angle α is 67.5°, in which case a fourth contact occurs, The second fold 2 is now also in contact with the first fold 1. Figure 6 shows 40. A 5° bend is shown, in which case all folds are continuous with each other. are in contact with.

7 and 8 show constant velocity rotation joints according to the prior art. The constant velocity rotation joint 7 shown in the figure has a bending angle α of 22.5°, as shown in FIG. The constant velocity rotation joint 7 has a bending angle α of 40.5°. From the drawings As shown in FIG. At a bending angle α of A gently folded portion 22 is formed.

Two T stones 5i 2 million r2 n3 X+ Nihs 20,000rH Nishishi i7 Two T stones 5ti ANNEX To - INTERNATIONAL 5EARCHREPOR ON

Claims (4)

[Claims] Bellows for fixed position joints with an excursion of up to 1.50°, poly It consists of a thermoplastic elastomer based on ether esters and contains at least In the type having three hairs, at least the front side of the first hair (1) The front side (3) of the face (3) and possibly the second hair (2) is connected to the joint ( 7) When viewed from the opposite side, the hair bottom (5) to the hair tip (6) is 15:1 to 8:1. ) and all other sides (8) have a side wall thickness ratio of 6:1 to 4:1. Bellows for fixed-position joints, characterized by having a wall thickness ratio Z. 2. Side wall of the front side (3) of the first hair (1) and optionally the second hair (2) The thickness of the hair base (5) is between 2.0 and 3.5 mm. Bellows as described in Range 1. 3. The side wall thickness of the other hair (8) is 1.2 to 2.2 m in the range of the hair bottom (5) The bellows according to claim 1 or 2, wherein the bellows is located between m. 4. The side wall thickness is located between 0.2 and 0.4 mm in the range of the hair tip (6). The bellows according to any one of claims 1 to 3.