TWM467763U - Temperature insensitive bearing structure - Google Patents

Description

Temperature-insensitive bearing construction

This creation is about a bearing construction, especially a temperature-insensitive bearing construction.

The bearing is an indispensable component of all kinds of machinery. The bearing is a cushioning element that supports the mandrel. It is also a kind of meson that moves between the faces and faces. It can make the rotation or sliding between the parts smoothly. The more common bearings are ball bearings and roller bearings, which have the advantages of high rigidity and high stress, and their rolling friction is smaller than sliding friction, so they are often used in high-precision, high-speed machines.

However, in the process of high-speed rotation, the bearing and the mandrel will continuously rub, so that the temperature of the contact point of each other increases, and in the case of uneven heating, the expansion of the inner side of the bearing is greater than that of the outer side, which easily causes the mandrel to loosen. As well as increasing the friction of the balls or rollers inside it, resulting in shaft hole damage or mechanical failure, the manufacturer has studied to improve the heat between the bearing and the mandrel.

Referring to the first figure, a cross-sectional view of a conventional bearing device mounted on a working machine includes: a double row cylindrical roller bearing 11', a combined radial thrust ball bearing 12', and a The thermal grease 11' is made of an inorganic powder of a thermal conductive material; wherein the combined radial thrust ball bearing 12' is loosely embedded in one of the working machine 2' a frame 21', and the first outer ring 121' of the combined radial thrust ball bearing 12' and the inner diameter surface of the frame 21' are filled with the thermal grease 13', thereby making the combination The heat of the radial thrust ball bearing 12' is released from the outer ring 121' to the frame 21' via the thermally conductive grease 13', and is maintained in a state of looseness embedded in the combined radial thrust ball bearing 12'. , inhibiting its temperature rise and thermal expansion.

In the above, the double row cylindrical roller bearing 11' can be respectively installed on both sides of the front end and the rear end of the main shaft 22' of the working machine 2', and the combined radial thrust ball bearing 12' is installed. After the double row cylindrical roller bearing 11' on both sides of the front end of the main shaft 22', the main shaft 22' is supported on the inner diameter surface of the frame 21' by the mounting manner; wherein the double row A second outer ring 111' of one of the cylindrical roller bearings 11' is closely embedded in the inner diameter surface of the frame 21' for receiving a radial load, and the combined radial thrust ball bearing 12' outer ring 121 'There is loosely embedded in the inner diameter surface of the frame 21' to withstand the thrust load. Moreover, the thermal grease 11' is filled between the outer ring 121' and the frame 21', and the thermal efficiency of the combined radial thrust ball bearing 2 can be promoted during the operation of the working machine 2'. The ground is released from the outer ring 121' toward the inner diameter surface of the frame 21'.

It can be known from the above that the conventional bearing device 1' can solve the problem that the contact point pressure of the outer ring is increased due to thermal expansion at high temperature, but the high temperature and heat are continuously generated between the bearing and the main shaft, which cannot fundamentally solve the bearing. Due to uneven heating, the degree of expansion is not uniform.

Therefore, in view of the fact that the conventional bearing device still has many shortcomings, the creator of the present case vigorously researched and created, and finally developed a temperature-insensitive bearing structure of the present invention, and the inner ring of the bearing has a thermal expansion coefficient. The negative value of the embedded ring can be used to offset the thermal expansion of the inner ring caused by friction and high temperature under high-speed operation of the bearing, so that the thermal expansion of the inner ring and the outer ring tends to be consistent, and the mandrel is prevented from loosening. Therefore, it is possible to replace/reinforce the deficiencies of the conventional bearing device.

The main purpose of this creation is to provide a temperature-insensitive bearing structure in which the inner ring of the bearing has an embedded ring with a negative thermal expansion coefficient, which can be used to offset the bearing under high speed operation, caused by friction and high temperature. The amount of thermal expansion of the ring is such that the amount of thermal expansion of the inner and outer rings tends to be uniform, preventing the mandrel from loosening.

Therefore, in order to achieve the main purpose of the creation, the creator of the present invention proposes a temperature-insensitive bearing structure, which comprises: a bearing; an outer ring; an inner ring, each of which has a groove for receiving An embedded ring is disposed, and the thermal expansion coefficient of the embedded ring is a negative value, which can be used to prevent the inner ring from excessively expanding after being heated; a slide is disposed between the outer ring and the inner ring, Made up of each other; and a plurality of rolling elements are disposed in the slideway for reducing frictional force during power transmission and improving transmission efficiency of mechanical power; wherein the outer ring, the slideway and the inner portion thereof are sequentially combined from the outside to the inside The plurality of rolling elements and the inner ring form the bearing.

In order to more clearly describe a temperature-insensitive bearing construction proposed by the present invention, a preferred embodiment of the present invention will be described in detail below with reference to the drawings.

Please also refer to the second figure, which is a schematic diagram of a temperature-insensitive bearing construction. As shown in the second figure, the temperature-insensitive bearing structure of the present invention includes: a bearing 1, an outer ring 11, an inner ring 12, a slide 13 and a plurality of rolling elements 14; wherein the inner ring Each of the two ends of the 12 has a groove 120 for receiving an embedded ring 121, and the coefficient of thermal expansion of the embedded ring 121 is a negative value, which can be used to prevent the inner ring 12 from excessively expanding after being heated; the slide 13 And disposed between the outer ring 11 and the inner ring 12, and the two are formed by the two; and the plurality of rolling elements 14 are disposed in the slide 13 to reduce friction during power transmission and The transfer efficiency of the mechanical power is increased; and the outer ring 11, the slide 13 and the plurality of rolling elements 14 therein and the inner ring 12 may be combined to form the bearing 1.

Continuing, the embedded ring 121 is made of a carbon fiber and an epoxy resin, wherein the annular resin has a glass transition temperature of 120 or more. °C. The process of inserting the ring 121 is: after the yarn bundle of the carbon fiber is pulled out from the reel, the carbon fiber is immersed in a container for holding the epoxy resin; then, the carbon fiber is wound in a circumferentially continuous manner to make the embedding. The mold of the ring 121 is applied with appropriate tension during the winding process and the excess epoxy resin is scraped off in a timely manner. After winding to a predetermined length and thickness, the product is baked in an oven to the ring. The curing temperature of the oxyresin (greater than or equal to 120 ° C); after the molding is cured, the insert ring 121 is obtained by demolding and cutting. Finally, the insert ring 121 is respectively disposed in the groove 120 of the two end faces of the inner ring 12, and the insert ring 121 and the inner ring 12 are coupled in a tightly fitting manner to complete the manufacture of the inner ring 12.

In view of the above, preferably, the carbon fiber may be a graphite fiber having a carbon content of more than 99%, such as Nippon Graphite Fiber ° Corp., an ultra-high modulus graphite fiber YS-95A having a modulus of up to 920 GPa and a coefficient of linear expansion - 1.5e-6/K, when the temperature rises, it can generate a great surrounding force to the bearing 1 and limit its radial expansion. Therefore, the graphite fiber/epoxy composite formed by the composite of graphite fiber and the epoxy resin is used. The material has a modulus of up to 720 GPa, and the glass transition temperature of the epoxy resin is greater than or equal to 120 ° C, so that the bearing 1 still has a high modulus after the temperature rise, without affecting the rigidity of the bearing 1.

Please refer to the third figure, which is a sectional view of the bearing of the present invention installed on a mechanical device. When the bearing 1 is mounted on a mandrel X of a mechanical device 2, the bearing 1 will continue during operation. The ground is operated at a high speed, causing the temperature to rise due to friction, and causing thermal expansion of the outer ring 11 and the inner ring 12, At the same time, the heat generated by the high temperature is transmitted to the direction of the mandrel X and the outer ring 11, respectively, and since the heat dissipation speed of the outer ring 11 is faster, the temperature is higher near the mandrel X, so that the inner The temperature of the ring 12 is higher than that of the outer ring 11, which tends to cause the thermal expansion of the inner ring 12 to be larger than that of the outer ring 11; however, the present invention is embedded in the inner ring 12 at each end surface of the inner ring 12, and The embedded ring 121 is made of the above-mentioned graphite fiber/epoxy composite material, and the length of the graphite fiber is gradually shortened as the temperature rises, and the shortening amount is proportional to the temperature increasing amount (shortening amount = thermal expansion coefficient × temperature) The amount of change).

Therefore, please refer to Table 1 and Table 2 below, which are the analysis tables of the inner ring and the embedded ring respectively, and refer to the fourth A picture and the fourth B picture respectively, which are the sections of the inner ring of the creation. The enlarged view and the analysis chart of the high temperature test, compared with the conventional bearing, the radial displacement of the bearing 1 with the embedded ring 121 after the temperature rise is reduced by 12% between A and C, and the diameter at B The displacement is reduced by 44%, that is, the higher the temperature closer to the mandrel X, the greater the amount of shortening of the embedded ring 121 near the X-end (at B), and the temperature of the embedded ring 121 at the other end due to temperature. Lower, the amount of shortening is smaller, and the thermal expansion of the inner ring 12 is restricted by the interaction of the embedded ring 121 at both ends of the inner ring 12, so that the thermal expansion of the outer ring 11 and the inner ring 12 tends to Consistently, thereby preventing the mandrel X from loosening due to thermal expansion of the bearing 1, and avoiding uneven thermal expansion, causing an increase in contact pressure of the bearing 1, affecting performance and service life, and further reducing the inner ring 12 Dry with the mandrel X The prestressing involved in the cooperation, thereby reducing the preload of the bearing 1.

Here, it should be additionally noted that, depending on the requirements of the mechanical device 2, the plurality of rolling elements 14 may be balls or rollers so that the bearing 1 of each device can operate smoothly.

Thus, the above-mentioned system has completely revealed and illustrated the present invention by means of a sectional view. A preferred embodiment of the temperature-insensitive bearing construction, and, by the above, we can see that the main advantages of this creation are:

1. This creation is embedded in an inner ring on both ends of the inner ring of the bearing, and the embedded ring is made of graphite fiber/epoxy composite material, and the modulus can be up to 720GPa, and the glass of the epoxy resin The transfer temperature is greater than or equal to 120 ° C, so that the bearing still has a high modulus after the temperature rises without affecting the rigidity of the bearing.

2. According to the first point mentioned above, when the temperature of the bearing increases, the thermal expansion of the inner ring can be restricted by the embedded ring, so that the thermal expansion of the outer ring and the inner ring tend to be uniform, thereby preventing the mandrel from being The bearing thermally expands and loosens and avoids uneven thermal expansion, causing the bearing contact pressure to rise, affecting its performance and service life.

3. According to the above second point, in addition, the pre-stress of the interference fit between the inner ring 12 and the mandrel can be further reduced, thereby lowering the preload of the bearing, so that the bearing is easy to maintain an optimum gap.

4. The temperature-insensitive bearing structure of the present invention has a simple structure, so that it is easy to manufacture and can reduce costs.

Through the above, the temperature-insensitive bearing construction of the present invention has been fully described at the same time; however, it must be emphasized that the above detailed description is specific to the presently feasible embodiment, but the embodiment is not intended to be used. Limitation of the scope of the patents of this creation, and equivalent implementations or changes without departing from the spirit of the invention, shall be included in the scope of the patent in this case.

1‧‧‧ bearing

11‧‧‧Outer Ring

12‧‧‧ Inner Ring

120‧‧‧ trench

121‧‧‧ embedded ring

13‧‧‧Slide

14‧‧‧Multiple rolling elements

2‧‧‧Mechanical equipment

X‧‧‧ mandrel

A~C‧‧‧Location

1'‧‧‧Used bearing unit

11'‧‧‧Double-row cylindrical roller bearings

12'‧‧‧Combined radial thrust ball bearings

13'‧‧‧ Thermal Grease

2’‧‧‧Working machine

21’‧‧‧Rack

121’‧‧‧First Outer Ring

22’‧‧‧ Spindle

111’‧‧‧ Second outer ring

The first figure is a cross-sectional view of a conventional bearing device mounted on a working machine; the second figure is a schematic view of a temperature-insensitive bearing structure of the present invention; the third figure is a bearing of the present invention installed in a machine The cross-sectional view of the device; the fourth A is an enlarged view of the inner ring of the present creation; and the fourth B is an analytical chart of the inner ring of the present invention subjected to high temperature testing.

1‧‧‧ bearing

11‧‧‧Outer Ring

12‧‧‧ Inner Ring

120‧‧‧ trench

121‧‧‧ embedded ring

13‧‧‧Slide

14‧‧‧Multiple rolling elements

Claims (5)

A temperature-insensitive bearing structure includes: a bearing; an outer ring; an inner ring having a groove on each of the end faces for receiving an embedded ring, and the thermal expansion coefficient of the embedded ring is negative , which can be used to prevent the inner ring from excessively expanding after being heated; a slide is disposed between the outer ring and the inner ring, and is formed by the two; and a plurality of rolling elements are disposed on the sliding a channel for reducing the frictional force during power transmission and improving the transmission efficiency of the mechanical power; wherein the outer ring, the slide and the plurality of rolling elements therein and the inner ring are sequentially combined from the outside to the inside The bearing is constructed. The temperature-insensitive bearing construction of claim 1, wherein the embedded ring is made of a carbon fiber and an epoxy resin. The temperature-insensitive bearing construction of claim 2, wherein the carbon fibers are graphite fibers, and the fibers are arranged in a circumferentially continuous configuration. A temperature-insensitive bearing construction as described in claim 2, wherein the epoxy resin has a glass transition temperature of greater than or equal to 120 °C. The temperature-insensitive bearing construction of claim 1, wherein the plurality of rolling elements can be any of the following: a ball and a roller.