CN114412915B - Transmission device with bearing and shaft - Google Patents
Transmission device with bearing and shaft Download PDFInfo
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- CN114412915B CN114412915B CN202210320988.4A CN202210320988A CN114412915B CN 114412915 B CN114412915 B CN 114412915B CN 202210320988 A CN202210320988 A CN 202210320988A CN 114412915 B CN114412915 B CN 114412915B
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- block
- rotating shaft
- shaft
- rod
- supporting rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a transmission device with a bearing and a shaft, and relates to the technical field of transmission equipment. The transmission with bearings and shaft includes a radial hydrodynamic air bearing and a rotating shaft. The radial dynamic pressure air bearing comprises an outer ring, an inner ring and a supporting mechanism. The supporting mechanism comprises a top block, the top block is inserted with the inner ring, the supporting plate is arranged between the outer ring and the inner ring, and one end of the top block is connected with the supporting plate. One end of the first supporting rod is hinged with the supporting plate, and the other end of the first supporting rod is inserted with the second supporting rod. One end of the third supporting rod is hinged with the supporting plate, and the other end of the third supporting rod is inserted with the fourth supporting rod. The second branch is articulated with fourth branch, and the one end of second branch articulates there is first slider, and the one end of fourth branch articulates there is the second slider, is connected with buffer spring between first slider and the second slider. The rotating shaft is provided with a pressing block, and the pressing block is connected with the rotating shaft through a telescopic mechanism. The outside air can enter between the rotating shaft and the inner ring more easily, so that a dynamic pressure air film is formed more quickly, and the time required by the take-off of the rotating shaft is shortened.
Description
Technical Field
The invention relates to the technical field of transmission equipment, in particular to a transmission device with a bearing and a shaft.
Background
Shafts and bearings are common devices used in transmissions.
The conventional foil dynamical pressure air bearing mainly comprises a bearing ring, a wave foil and a top foil, wherein one end of the top foil and one end of the wave foil are usually fixed on the bearing ring, and the wave foil and the top foil form a structure with one fixed end and the other free end so as to support the top foil. Similar to the principle of the hovercraft, when the foil sheet dynamic pressure air bearing works, a dynamic pressure air film is formed between the top foil and the rotor (namely, a rotating shaft), and the rotor is supported by utilizing the elastic potential energy of air so as to take off the rotor and realize lubrication through the air.
However, the current foil dynamical pressure air bearing has the following problems: because the rotor is contacted with the top foil before taking off, air is not easy to enter between the rotor and the top foil, the time required by the rotor taking off is longer, and certain abrasion still exists between the rotor and the top foil.
Disclosure of Invention
In view of the above situation, the invention provides a transmission device with a bearing and a shaft, which solves the technical problems that the existing foil dynamical pressure air bearing is not easy to enter between a rotor and a top foil due to the fact that the rotor is in contact with the top foil before taking off, so that the time required by the rotor taking off is long, and certain abrasion still exists between the rotor and the top foil.
In order to achieve the purpose, the invention provides the following technical scheme:
a transmission having a bearing and a shaft may generally include: radial dynamic pressure air bearing and rotating shaft;
the radial dynamic pressure air bearing comprises an outer ring, an inner ring and a supporting mechanism, wherein the inner ring is fixed in the outer ring;
the supporting mechanism comprises a top block, a supporting plate, a first supporting rod and a third supporting rod;
the top block is arranged along the radial direction of the inner ring and is spliced with the inner ring, and one end of the top block is exposed out of the inner side of the inner ring; the plurality of jacking blocks are uniformly distributed along the circumferential direction of the inner ring;
the supporting plate is movably arranged between the outer ring and the inner ring, and one end of the ejector block facing the outer ring is connected with the supporting plate;
one end of the first supporting rod is hinged with the supporting plate, and the other end of the first supporting rod is inserted with a second supporting rod;
one end of the third supporting rod is hinged with the supporting plate, and the other end of the third supporting rod is inserted with a fourth supporting rod;
the second supporting rod is hinged with the fourth supporting rod, one end of the second supporting rod is hinged with a first sliding block, one end of the fourth supporting rod is hinged with a second sliding block, and a buffer spring is connected between the first sliding block and the second sliding block; an annular sliding rail is fixed on the inner side of the outer ring, and the first sliding block and the second sliding block are connected with the sliding rail in a sliding manner;
the rotating shaft is provided with a pressing block along the radial direction, and the pressing block can be abutted against the ejecting block; the pressing blocks are uniformly distributed along the circumferential direction of the rotating shaft; the briquetting pass through telescopic machanism with the pivot is connected, works as after the rotational speed of pivot reaches the predetermined value, the briquetting can retract in the pivot.
In some embodiments of the present invention, the telescoping mechanism comprises an insert cylinder, a centrifugal block, a first tension spring, and an insert rod;
the inserting cylinder is inserted with the rotating shaft, a first guide rail is fixed on the inserting cylinder, the first guide rail is connected with a first sliding seat in a sliding manner, the first sliding seat is hinged with a fifth connecting rod, the middle part of the fifth connecting rod is rotatably connected with the rotating shaft, one end, away from the first sliding seat, of the fifth connecting rod is hinged with a second sliding seat, and the second sliding seat is connected with a second guide rail in a sliding manner;
the centrifugal block can move along the radial direction of the rotating shaft, the second guide rail is fixed on the centrifugal block, and the first tension spring is connected with the centrifugal block and the rotating shaft;
the inserted bar is inserted into the inserted cylinder, the inserted bar is provided with a connecting part, and the connecting part is connected with the pressing block;
the telescopic mechanism also comprises a convex ring, a second tension spring and a limit tooth;
the convex ring is fixed on the inserted link;
one end of the second tension spring is connected with the convex ring, and the other end of the second tension spring is connected with the inserting cylinder;
the limiting teeth are fixed on the inserted bar and used for limiting the movement of the first sliding seat.
In some embodiments of the invention, the connecting part and the pressing block are connected through a screw.
In some embodiments of the invention, 8 of the top blocks are attached to each of the brackets.
In some embodiments of the present invention, a vertical distance between the top block and the rotating shaft is gradually decreased in an axial direction of the rotating shaft.
In some embodiments of the invention, along the circumferential direction of the inner ring, the vertical distance between one side of the top block close to the rotating shaft and the lowest position of the side surface of the rotating shaft is gradually reduced;
an avoiding notch is formed in one side of the pressing block, and a clamping block is fixed on the side wall of the avoiding notch;
and one side of the top block is provided with a clamping groove matched with the clamping block.
In some embodiments of the invention, a side of the pressing block close to the top block is arc-shaped.
In some embodiments of the invention, the top block is connected with a top rod, the top rod is inserted with a connecting block, and the connecting block is inserted with the inner ring and fixed on the support plate;
an elastic part is connected between the ejector rod and the connecting block.
In some embodiments of the present invention, the middle of the elastic member is arched, and one end of the post rod is fixed in the middle of the elastic member;
the two ends of the elastic piece are arranged along the radial direction of the connecting block and are connected with the connecting block in an inserting mode.
In some embodiments of the invention, the ejector block and the ejector pin are connected by a connecting pin.
The embodiment of the invention at least has the following advantages or beneficial effects:
1. the inner ring is fixed in the inboard of outer lane, before the pivot takes off, partial briquetting and kicking block contact to raise the pivot, the outer wall of pivot does not make the outside air get into more easily between pivot and the inner ring with the inboard direct contact of inner ring, so that form the dynamic pressure gas film sooner, shorten the pivot and take off required duration, pivot and inner ring just also be difficult for wearing and tearing. After the rotating shaft takes off, the pressing block is separated from the top block, and the rotating shaft can rotate stably.
2. Before the rotating shaft takes off, the rotating shaft can enable the ejector block to drive the support plate to move towards the direction close to the outer ring, at the moment, the ejector block drives the support plate to slightly move away from the rotating shaft, the distance between the hinge points of the support plate and the second support rod and the fourth support rod is large, the moving distance between the first support rod and the third support rod is small, the first support rod can easily drive the second support rod, and the third support rod can easily drive the fourth support rod; after the rotating shaft takes off, under the action of the dynamic pressure air film, the ejector block drives the support plate to continue to be far away from the rotating shaft, at the moment, the distance between the support plate and the hinge joint of the second support rod and the hinge joint of the fourth support rod is further reduced, so that the first support rod cannot easily drive the second support rod, the third support rod cannot easily drive the fourth support rod, and the distance between the first sliding block and the second sliding block which move towards the opposite direction is smaller. That is to say, in the process of the pivot taking off, the kicking block receives the size that comes from buffer spring's effort, can increase gradually in the self-adaptation, and the dynamic pressure gas film can provide suitable damping force for the rotation of pivot, makes the pivot rotate more steadily.
3. The supporting mechanism replaces the function of the wave foil, the sliding rail is fixed on the inner side of the outer ring, and the first sliding block and the second sliding block are connected with the sliding rail in a sliding mode, so that the first sliding block and the second sliding block can slide on the sliding rail in opposite directions, one end of the wave foil does not need to be fixed like the traditional wave foil, and the other end of the wave foil is a free end. This is because, when one end of the bump foil is fixed and the other end is a free end, the structure has natural asymmetry, so that the damping effect of the free end of the bump foil is good, while the damping effect of the fixed end is poor.
4. Compared with the conventional bump foil, in the case of fixing the inner ring, the first slider and the second slider are not easily moved in the axial direction of the outer ring due to the limitation of the slide rail, which obviously helps to make the rotating shaft rotate more smoothly.
5. After the rotating shaft takes off, if the rotating speed of the rotating shaft reaches a preset value, the pressing block retracts into the rotating shaft, so that resistance applied to rotation of the rotating shaft is reduced, and the rotating shaft rotates more stably.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a transmission having a bearing and a shaft;
FIG. 2 is a schematic view of the structure of FIG. 1 taken along the left side;
FIG. 3 is an enlarged view of a portion of FIG. 2 at position A;
FIG. 4 is an enlarged view of a portion of FIG. 3 at position B;
FIG. 5 is an enlarged view of a portion of the C position of FIG. 4;
FIG. 6 is an enlarged view of a portion of FIG. 5 at position D;
FIG. 7 is a schematic structural view of the telescoping mechanism;
FIG. 8 is an enlarged view of a portion of FIG. 7 at position E;
FIG. 9 is an enlarged view of a portion of FIG. 3 at position F;
FIG. 10 is a schematic view showing a structure in which a vertical distance between the top block and the rotating shaft is gradually decreased along the axial direction of the rotating shaft;
fig. 11 is a schematic view of the structure of fig. 10 along the right side.
Icon:
1-a radial dynamic pressure air bearing,
11-an outer ring, wherein,
12-an inner ring, wherein the inner ring is provided with a plurality of grooves,
13-supporting mechanism, 131-top block, 132-supporting plate, 133-first supporting rod, 134-third supporting rod, 135-second supporting rod, 136-fourth supporting rod, 137-first sliding block, 139-second sliding block, 141-buffer spring, 142-sliding rail, 143-clamping groove, 144-top rod, 145-connecting block, 146-elastic piece, 147-connecting pin,
3-a rotating shaft, wherein the rotating shaft is provided with a rotating shaft,
31-pressing block, 311-avoiding notch, 312-clamping block,
32-telescoping mechanism, 321-inserting cylinder, 322-centrifugal block, 323-first tension spring, 324-inserting rod, 325-convex ring, 326-second tension spring, 327-limit tooth, 328-first guide rail, 329-first sliding seat, 331-fifth connecting rod, 332-second guide rail, 333-connecting part and 334-second sliding seat.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the embodiments of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the embodiments of the present invention, it should be understood that the terms "upper", "left", "right", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are only used for convenience in describing the embodiments of the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1 to 11, the present embodiment provides a transmission device having a bearing and a shaft, which mainly includes a radial dynamic pressure air bearing 1 and a rotating shaft 3.
The radial dynamic pressure air bearing 1 includes an outer ring 11, an inner ring 12, and a support mechanism 13, wherein the inner ring 12 is fixed in the outer ring 11, and the support mechanism 13 includes a top block 131, a support plate 132, a first support rod 133, and a third support rod 134.
The top block 131 is arranged along the radial direction of the inner ring 12, and is inserted into the inner ring 12, and one end of the top block 131 is exposed from the inner side of the inner ring 12. The plurality of top blocks 131 are uniformly distributed along the circumferential direction of the inner race 12. The support plate 132 is movably disposed between the outer ring 11 and the inner ring 12, and one end of the top block 131 facing the outer ring 11 is connected to the support plate 132. One end of the first strut 133 is hinged to the strut 132, and the other end is inserted with the second strut 135. One end of the third strut 134 is hinged to the brace 132, and the other end is plugged with a fourth strut 136. The second supporting rod 135 is hinged with the fourth supporting rod 136, one end of the second supporting rod 135 is hinged with a first sliding block 137, one end of the fourth supporting rod 136 is hinged with a second sliding block 139, and a buffer spring 141 is connected between the first sliding block 137 and the second sliding block 139. An annular slide rail 142 is fixed on the inner side of the outer ring 11, and the first slide block 137 and the second slide block 139 are connected with the slide rail 142 in a sliding manner.
The rotary shaft 3 is provided with a pressing piece 31 along a radial direction thereof, and the pressing piece 31 can abut on the top piece 131. The plurality of pressing blocks 31 are uniformly distributed along the circumferential direction of the rotating shaft 3. The pressing block 31 is connected with the rotating shaft 3 through the telescopic mechanism 32, and when the rotating speed of the rotating shaft 3 reaches a preset value, the pressing block 31 can be retracted into the rotating shaft 3.
Before the rotary shaft 3 takes off, part of the pressing blocks 31 are in contact with the top blocks 131, so that the rotary shaft 3 is lifted, the outer wall of the rotary shaft 3 is not in direct contact with the inner side of the inner ring 12, outside air can enter the space between the rotary shaft 3 and the inner ring 12 more easily, a dynamic pressure air film is formed more quickly, the time required by the rotary shaft 3 taking off is shortened, and the rotary shaft 3 and the inner ring 12 are not easy to wear. After the rotating shaft 3 takes off, the pressing block 31 is separated from the top block 131, and the rotating shaft 3 can rotate smoothly.
Specifically, please refer to fig. 3, fig. 4, fig. 7 and fig. 8. The telescoping mechanism 32 may mainly include a socket 321, a centrifugal block 322, a first tension spring 323, a socket lever 324, a collar 325, a second tension spring 326, and a limit tooth 327. The inserting cylinder 321 is inserted into the rotating shaft 3, a first guide rail 328 is fixed on the inserting cylinder 321, the first guide rail 328 is connected with a first sliding seat 329 in a sliding manner, the first sliding seat 329 is hinged with a fifth connecting rod 331, the middle part of the fifth connecting rod 331 is rotatably connected with the rotating shaft 3, one end, far away from the first sliding seat 329, of the fifth connecting rod 331 is hinged with a second sliding seat 334, and the second sliding seat 334 is connected with a second guide rail 332 in a sliding manner. The centrifugal block 322 can move along the radial direction of the rotating shaft 3, the second guide rail 332 is fixed on the centrifugal block 322, one end of the first tension spring 323 is connected with the centrifugal block 322, and the other end is connected with the rotating shaft 3. The insertion rod 324 is inserted into the insertion cylinder 321, the insertion rod 324 has a connection part 333, and the connection part 333 is connected to the pressing block 31. A collar 325 is secured to the plunger 324. One end of the second tension spring 326 is connected to the collar 325, and the other end is connected to the insertion tube 321. A limit tooth 327 is fixed to the plunger 324, the limit tooth 327 limiting the movement of the first slider 329. When the spindle 3 takes off, the pressing block 31 is separated from the top block 131, and the centrifugal block 322 moves toward the inner ring 12 under the action of centrifugal force as the rotation speed of the spindle 3 increases. When the centrifugal block 322 moves towards the direction close to the inner ring 12, the acting force is transmitted to the pressing block 31 by the centrifugal block 322, that is, the fifth link 331 is driven by the centrifugal block 322 to rotate clockwise, and drives the inserting cylinder 321 and the inserting rod 324 to move, so that the pressing block 31 connected with the inserting rod 324 retracts into the rotating shaft 3, which helps to reduce the resistance applied to the rotation of the rotating shaft 3, and the rotating shaft 3 rotates more smoothly. When the pressing block 31 is required to be in contact with the ejecting block 131, in order to avoid the transmission of the acting force from the pressing block 31 to the centrifugal block 322, a convex ring 325, a second tension spring 326 and a limit tooth 327 are arranged. When the pressing block 31 is not in contact with the top block 131, a certain distance is reserved between the pressing block 31 and the inserting cylinder 321; with the rotation of the rotating shaft 3, after the pressing block 31 contacts the top block 131, the insertion rod 324 moves in a direction away from the top block 131, at this time, the acting force of the second tension spring 326 on the insertion cylinder 321 is smaller than the acting force of the first tension spring 323 on the centrifugal block 322, the insertion cylinder 321 does not move along with the pressing block 31 and the insertion cylinder 321, and when the limiting tooth 327 on the insertion rod 324 moves to the left side (left and right direction shown in fig. 8) of the first sliding seat 329, the limiting tooth 327 can limit the left movement of the first sliding seat 329 to limit the rotation of the fifth connecting rod 331, so as to avoid the acting force from being transmitted from the pressing block 31 to the centrifugal block 322.
In order to facilitate the installation and replacement of the pressing block 31, the connecting portion 333 and the pressing block 31 may be connected by a screw (not shown), for example.
In this embodiment, each support plate 132 is connected with 8 top blocks 131 to simplify the structure, and of course, in other embodiments, the number of the top blocks 131 connected to each support plate 132 may be other.
As shown in fig. 10, the vertical distance d1 between the top block 131 and the rotating shaft 3 gradually decreases along the axial direction of the rotating shaft 3, so that an air wedge surface required for the takeoff of the rotating shaft 3 can be formed between the top block 131 and the rotating shaft 3, and outside air can better enter between the rotating shaft 3 and the top block 131, so that the takeoff of the rotating shaft 3 is faster.
As shown in fig. 4, 9 and 11, along the circumferential direction of the inner ring 12, the vertical distance d2 between the side of the top block 131 close to the rotating shaft 3 and the lowest position of the side surface of the rotating shaft 3 gradually decreases, or the projection of the top block 131 close to the rotating shaft 3 on the plane of the end surface of the rotating shaft 3 is an inclined straight line. An avoiding notch 311 is formed in one side of the pressing block 31, and a clamping block 312 is fixed on the side wall of the avoiding notch 311. One side of the top block 131 is provided with a clamping groove 143 matched with the clamping block 312. When the rotating shaft 3 rotates clockwise, the fixture block 312 on the pressing block 31 can be clamped into the fixture groove 143 on the top block 131, at this time, the pressing block 31 hooks the top block 131, and the support plate 132 connected with the top block 131 cannot move along with the pressing block 31 under the limitation of the inner ring 12, so that the rotating shaft 3 can be limited to rotate clockwise, and the rotating shaft 3 can only rotate counterclockwise.
The side of pressing block 31 close to top block 131 is arc-shaped, so that pressing block 31 and top block 131 can be better contacted, and the contact area between pressing block 31 and top block 131 can be reduced.
Referring to fig. 5 and 6, in order to reduce the friction force between the top block 131 and the pressing block 31 during the takeoff process of the rotating shaft 3, the top block 131 is connected with a top rod 144, the top rod 144 is inserted with a connecting block 145, and the connecting block 145 is inserted with the inner ring 12 and fixed on the support plate 132. An elastic member 146 is connected between the push rod 144 and the connecting block 145. More specifically, the middle of the elastic member 146 is arched, and one end of the push rod 144 is fixed to the middle of the elastic member 146 by welding or the like. Both ends of the elastic member 146 are disposed along a radial direction of the nub 145 and are inserted into the nub 145. When the top block 131 is in contact with the pressing block 31, the pressing block 31 can easily push the top block 131, the reaction force applied to the pressing block 31 is small, and the friction force between the two is small.
In order to facilitate the installation and replacement of the top block 131, the top block 131 is connected to the top rod 144 by a connecting pin 147.
In connection with the above-described structure, the working principle and advantageous effects of the transmission having the bearing and the shaft will be described in detail below.
Before the rotating shaft 3 takes off, part of the pressing block 31 is in contact with the top block 131, and the outer wall of the rotating shaft 3 is not in direct contact with the inner side of the inner ring 12, so that outside air can enter between the rotating shaft 3 and the inner ring 12 more easily, particularly between the rotating shaft 3 and the top block 131, a dynamic pressure air film is formed more quickly, the time required by the rotating shaft 3 taking off is shortened, and the rotating shaft 3 and the inner ring 12 are not easy to wear. After the rotating shaft 3 takes off, the pressing block 31 is separated from the top block 131, and the rotating shaft 3 can rotate smoothly.
Before the rotating shaft 3 takes off, the rotating shaft 3 can enable the top block 131 to drive the support plate 132 to move towards the direction close to the outer ring 11, at the moment, the top block 131 drives the support plate 132 to slightly move away from the rotating shaft 3, the distance between the hinge points of the support plate 132 and the second support rod 135 and the fourth support rod 136 is large, the moving distance between the first support rod 133 and the third support rod 134 is small, the first support rod 133 can easily drive the second support rod 135, and the third support rod 134 can easily drive the fourth support rod 136; after the rotating shaft 3 takes off, under the action of the dynamic pressure air film, the top block 131 drives the support plate 132 to continue to be away from the rotating shaft 3, at this time, the distance between the hinge points of the support plate 132 and the second support rod 135 and the fourth support rod 136 is further reduced, so that the first support rod 133 cannot easily drive the second support rod 135, the third support rod 134 cannot easily drive the fourth support rod 136, and the distance that the first sliding block 137 and the second sliding block 139 move in opposite directions is small. That is, during the takeoff of the rotating shaft 3, the magnitude of the acting force of the top block 131 from the buffer spring 141 can be adaptively increased gradually, and the dynamic pressure film can provide a suitable damping force for the rotation of the rotating shaft 3, so that the rotating shaft 3 rotates more smoothly.
The supporting mechanism 13 is used for replacing the function of the wave foil, the sliding rail 142 is fixed on the inner side of the outer ring 11, and the first sliding block 137 and the second sliding block 139 are connected with the sliding rail 142 in a sliding mode, so that the first sliding block 137 and the second sliding block 139 can slide on the sliding rail 142 in opposite directions, and the wave foil does not need to be fixed at one end and free at the other end like the traditional wave foil. This is because, when one end of the bump foil is fixed and the other end is a free end, the structure has natural asymmetry, so that the damping effect of the free end of the bump foil is good, while the damping effect of the fixed end is poor.
Compared to the conventional bump foil, in the case of fixing the inner ring 12, the first slider 137 and the second slider 139 are less likely to generate play in the axial direction of the outer ring 11 due to the restriction of the slide rail 142, which obviously contributes to more smooth rotation of the rotary shaft 3.
After the shaft 3 takes off, if the rotation speed of the shaft 3 reaches a predetermined value, the pressing block 31 retracts into the shaft 3, which helps to reduce the resistance applied to the rotation of the shaft 3, so that the shaft 3 rotates more smoothly.
Finally, it should be noted that: the present invention is not limited to the above-described preferred embodiments, but various modifications and changes can be made by those skilled in the art, and the embodiments and features of the embodiments of the present invention can be combined with each other arbitrarily without conflict. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A transmission having a bearing and a shaft, comprising: radial dynamic pressure air bearing and rotating shaft;
the radial dynamic pressure air bearing comprises an outer ring, an inner ring and a supporting mechanism, wherein the inner ring is fixed in the outer ring;
the supporting mechanism comprises a top block, a supporting plate, a first supporting rod and a third supporting rod;
the top block is arranged along the radial direction of the inner ring and is spliced with the inner ring, and one end of the top block is exposed out of the inner side of the inner ring; the plurality of jacking blocks are uniformly distributed along the circumferential direction of the inner ring;
the supporting plate is movably arranged between the outer ring and the inner ring, and one end, facing the outer ring, of the ejector block is connected with the supporting plate;
one end of the first supporting rod is hinged with the supporting plate, and the other end of the first supporting rod is inserted with a second supporting rod;
one end of the third supporting rod is hinged with the supporting plate, and the other end of the third supporting rod is inserted with a fourth supporting rod;
the second supporting rod is hinged with the fourth supporting rod, one end of the second supporting rod is hinged with a first sliding block, one end of the fourth supporting rod is hinged with a second sliding block, and a buffer spring is connected between the first sliding block and the second sliding block; an annular sliding rail is fixed on the inner side of the outer ring, and the first sliding block and the second sliding block are connected with the sliding rail in a sliding manner;
the rotating shaft is provided with a pressing block along the radial direction, and the pressing block can be abutted against the ejecting block; the pressing blocks are uniformly distributed along the circumferential direction of the rotating shaft; the briquetting pass through telescopic machanism with the pivot is connected, works as after the rotational speed of pivot reaches the predetermined value, the briquetting can retract in the pivot.
2. The transmission with bearing and shaft of claim 1, wherein the telescoping mechanism includes an insert barrel, a centrifugal block, a first tension spring, and an insert rod;
the inserting cylinder is inserted into the rotating shaft, a first guide rail is fixed on the inserting cylinder, the first guide rail is connected with a first sliding seat in a sliding manner, the first sliding seat is hinged with a fifth connecting rod, the middle part of the fifth connecting rod is rotatably connected with the rotating shaft, one end of the fifth connecting rod, which is far away from the first sliding seat, is hinged with a second sliding seat, and the second sliding seat is connected with a second guide rail in a sliding manner;
the centrifugal block can move along the radial direction of the rotating shaft, the second guide rail is fixed on the centrifugal block, and the first tension spring is connected with the centrifugal block and the rotating shaft;
the inserted bar is inserted into the inserted cylinder, the inserted bar is provided with a connecting part, and the connecting part is connected with the pressing block;
the telescopic mechanism also comprises a convex ring, a second tension spring and a limit tooth;
the convex ring is fixed on the inserted link;
one end of the second tension spring is connected with the convex ring, and the other end of the second tension spring is connected with the inserting cylinder;
the limiting teeth are fixed on the inserted bar and used for limiting the movement of the first sliding seat.
3. The transmission having a bearing and a shaft of claim 2, wherein the connecting portion is connected to the pressure block by a screw.
4. The transmission having a bearing and shaft of claim 1 wherein 8 of said top blocks are attached to each said carrier.
5. The transmission having a bearing and a shaft of claim 1, wherein a vertical spacing between the top block and the shaft is gradually reduced in an axial direction of the shaft.
6. Transmission with bearing and shaft according to any of claims 1 to 5,
along the circumferential direction of the inner ring, the vertical distance between one side of the top block close to the rotating shaft and the lowest position of the side surface of the rotating shaft is gradually reduced;
an avoiding notch is formed in one side of the pressing block, and a clamping block is fixed on the side wall of the avoiding notch;
and one side of the top block is provided with a clamping groove matched with the clamping block.
7. The transmission having a bearing and shaft of claim 6, wherein a side of the pressure block adjacent the top block is arcuate.
8. Transmission with a bearing and a shaft according to claim 6,
the top block is connected with a top rod, the top rod is inserted with a connecting block, and the connecting block is inserted with the inner ring and fixed on the support plate;
an elastic part is connected between the ejector rod and the connecting block.
9. Transmission with a bearing and a shaft according to claim 8,
the middle part of the elastic part is arched, and one end of the ejector rod is fixed in the middle part of the elastic part;
the two ends of the elastic piece are arranged along the radial direction of the connecting block and are connected with the connecting block in an inserting mode.
10. The transmission having a bearing and shaft of claim 8, wherein the top block and the top bar are connected by a connecting pin.
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| CN202210320988.4A CN114412915B (en) | 2022-03-30 | 2022-03-30 | Transmission device with bearing and shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210320988.4A CN114412915B (en) | 2022-03-30 | 2022-03-30 | Transmission device with bearing and shaft |
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| CN114412915A CN114412915A (en) | 2022-04-29 |
| CN114412915B true CN114412915B (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210320988.4A Active CN114412915B (en) | 2022-03-30 | 2022-03-30 | Transmission device with bearing and shaft |
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| CN114412915A (en) | 2022-04-29 |
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