A high-precision transmission shaft for load-carrying industry

Abstract

The utility model belongs to the technical field of transmission shafts, and in particular to a high-precision transmission shaft for the load-carrying industry, comprising a left wheel disc and a right wheel disc, wherein the left wheel disc is coaxially arranged with the right wheel disc, and the edge of the right side of the left wheel disc is equally divided with three fixed fan-shaped petals, and the angles of the two side surfaces of the three fixed fan-shaped petals are all sixty degrees, and a movable fan-shaped petal is movably engaged and connected between two adjacent fixed fan-shaped petals, and the angles of the two side surfaces of the three movable fan-shaped petals are all sixty degrees; the right end centers of the three movable fan-shaped petals are fixedly connected with a trapezoidal guide rail, and the angles of the central axis of the trapezoidal guide rail and the two side surfaces of the movable fan-shaped petals are equal; in the utility model, the outer circumferential surfaces of the three movable fan-shaped petals are sleeved and gathered by a rubber tube, so that the side surfaces of the movable fan-shaped petals are tightly fitted and connected with the side surfaces of the fixed fan-shaped petals, and compared with the traditional spline shaft and spline sleeve, there is no gap between the contact surfaces of the movable fan-shaped petals and the fixed fan-shaped petals, so that the radial accuracy of the transmission shaft can be well maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission shafts, in particular to a high-precision transmission shaft used in the load-carrying industry. Background Art

[0002] The transmission shaft is a commonly used mechanical component in engineering machinery, especially in the load-bearing industry. The current transmission shaft includes fixed shafts, telescopic shafts, elastic shafts, etc. The transmission shafts used in the load-bearing industry will cause the following problems when in use: Due to the principle of thermal expansion and contraction, the length of the transmission shaft will increase with the increase of temperature and shorten with the decrease of temperature, which not only affects the transmission accuracy, but also causes fatigue damage to the transmission shaft. The current solution is to use spline shafts and spline sleeves as length compensation components of the connecting shaft; however, when using spline shafts and spline sleeves as compensation components of the connecting shaft, the spline shafts and spline sleeves are in a state of friction for a long time, which will cause the gap between the two to become larger and larger. After long-term use, the accuracy of the compensation part is reduced, noise is generated during operation, and the gap cannot be eliminated by adjustment and maintenance. The only way is to replace the spline shaft and spline sleeve, or even the main body of the transmission shaft. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies of the prior art, the utility model provides a high-precision transmission shaft for the load-carrying industry, which solves the problems raised in the above-mentioned background technology.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0007] A high-precision transmission shaft for the load-carrying industry comprises a left wheel disc and a right wheel disc, wherein the left wheel disc is coaxially arranged with the right wheel disc, and the right edge of the left wheel disc is equally divided and fixed with three fixed fan-shaped petals, and the included angles of the two sides of the three fixed fan-shaped petals are all 60 degrees, and a movable fan-shaped petal is movably connected between two adjacent fixed fan-shaped petals, and the included angles of the two sides of the three movable fan-shaped petals are all 60 degrees; the right end center parts of the three movable fan-shaped petals are fixedly connected with a trapezoidal guide rail, and the included angles of the central axis of the trapezoidal guide rail and the two sides of the movable fan-shaped petal are equal ; The left side surface of the right wheel disc is provided with three trapezoidal grooves at equal intervals, the inclination of the outer camber of the trapezoidal guide rail is the same as the inclination of the inner camber of the trapezoidal groove, and the three movable fan-shaped petals are respectively positioned and connected to the left side of the right wheel disc through the trapezoidal guide rails and trapezoidal grooves that fit together; The right wheel disc is provided with three waist-shaped grooves at equal intervals, and two locking screws are inserted in each of the three waist-shaped grooves. Two locking screw holes are provided at the right end of the trapezoidal guide rail, and the two locking screws are adapted to be screwed into the corresponding locking screw holes, and the outer circumferential surfaces of the three movable fan-shaped petals are sleeved with rubber tubes.

[0008] Furthermore, the outer circumferential surfaces of the three fixed fan-shaped petals are each provided with a through hole, an oil filling cup is embedded and connected in the through hole, and the inclined surfaces on both sides of the three fixed fan-shaped petals are each provided with an oil guide groove, and the oil filling cup is connected to the oil guide groove.

[0009] Furthermore, the left end of the left wheel disc and the right end of the right wheel disc are both coaxially fixedly connected with an extension shaft, and the end surfaces of the two extension shafts are both fixedly connected with flanges.

[0010] Furthermore, the outer circumferential surfaces of the three movable fan-shaped petals protrude from the outer circumferential surfaces of the three fixed fan-shaped petals by one millimeter to five millimeters.

[0011] Furthermore, the rubber tube is a corrugated tube, the outer circumferential surfaces of the three fixed fan-shaped petals are provided with corrugated grooves, and the inner hole convex ribs of the rubber tube are adapted to be embedded in the corrugated grooves.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a high-precision transmission shaft for the load-carrying industry, which has the following beneficial effects:

[0014] In the utility model, the outer circumferential surfaces of the three movable fan-shaped petals are sleeved and gathered by the rubber tube, so that the side surfaces of the movable fan-shaped petals are closely connected with the side surfaces of the fixed fan-shaped petals. Compared with the traditional spline shaft and spline sleeve, there is no gap between the contact surfaces of the movable fan-shaped petals and the fixed fan-shaped petals, so that the transmission shaft can maintain radial accuracy well.

[0015] According to the utility model, when the positions of the left wheel disc and the right wheel disc are fixed and the external temperature changes greatly, resulting in thermal expansion and contraction, the three movable fan-shaped petals and the three fixed fan-shaped petals can slide relative to each other in the axial direction, thereby offsetting the structural stress generated between traditional shafts during thermal expansion and contraction, so that the transmission shaft always maintains the axial accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 It is a side sectional schematic diagram of the main structure of the utility model;

[0018] Figure 3 This is a schematic axial cross-sectional view of the main structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the connection between the right wheel disc and the movable fan-shaped petal of the utility model.

[0020] In the figure: 1. left wheel disc; 2. right wheel disc; 3. fixed fan-shaped petal; 4. movable fan-shaped petal; 5. trapezoidal guide rail; 6. trapezoidal groove; 7. waist-shaped groove; 8. locking screw; 9. locking screw hole; 10. rubber tube; 11. oil filling cup; 12. oil guide groove; 13. extension shaft; 14. flange. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Example

[0023] like Figure 1 , 2 , 3 and 4, an embodiment of the utility model provides a high-precision transmission shaft for the load-carrying industry, comprising a left wheel disc 1 and a right wheel disc 2, the left wheel disc 1 and the right wheel disc 2 are coaxially arranged, the edge of the right side of the left wheel disc 1 is equally divided with three fixed fan-shaped petals 3, the angles of the two sides of the three fixed fan-shaped petals 3 are all sixty degrees, and a movable fan-shaped petal 4 is movably engaged and connected between two adjacent fixed fan-shaped petals 3, the angles of the two sides of the three movable fan-shaped petals 4 are all sixty degrees; the right end center parts of the three movable fan-shaped petals 4 are fixedly connected with a trapezoidal guide rail 5, the central axis of the trapezoidal guide rail 5 is aligned with the movable fan-shaped petal 4. The angles of the two side surfaces are equal; three trapezoidal grooves 6 are evenly spaced on the left side surface of the right wheel disc 2, the inclination of the outward camber of the trapezoidal guide rail 5 is the same as the inclination of the inward camber of the trapezoidal groove 6, and the three movable fan-shaped petals 4 are respectively positioned and connected to the left side of the right wheel disc 2 through the trapezoidal guide rails 5 and the trapezoidal grooves 6 that fit together; three waist-shaped grooves 7 are evenly spaced on the right wheel disc 2, and two locking screws 8 are inserted in the three waist-shaped grooves 7, and two locking screws 8 are provided at the right end of the trapezoidal guide rail 5, and the two locking screws 8 are adapted to be screwed into the corresponding locking screw holes 9, and the outer circumferential surfaces of the three movable fan-shaped petals 4 are sleeved with rubber tubes 10.

[0024] In this embodiment, when the left wheel disc 1 rotates, the torque is transmitted to the three movable fan-shaped petals 4 through the three fixed fan-shaped petals 3, and then transmitted to the right wheel disc 2 through the trapezoidal guide rail 5 and the trapezoidal groove 6;

[0025] Because the outer circumferential surfaces of the three movable fan-shaped petals 4 are sleeved and gathered by the rubber tube 10, the side surfaces of the movable fan-shaped petals 4 are closely fitted with the side surfaces of the fixed fan-shaped petals 3. Compared with the traditional spline shaft and spline sleeve, there is no gap between the contact surfaces of the movable fan-shaped petals 4 and the fixed fan-shaped petals 3, so that the transmission shaft can maintain radial accuracy well.

[0026] When the left wheel disc 1 and the right wheel disc 2 are fixed and the outside temperature changes greatly, resulting in thermal expansion and contraction, the three movable fan-shaped petals 4 and the three fixed fan-shaped petals 3 can slide relative to each other in the axial direction, which can offset the structural stress generated between the traditional shafts during thermal expansion and contraction, so that the transmission shaft always maintains the axial accuracy;

[0027] When the three fixed fan-shaped petals 3 and the three movable fan-shaped petals 4 become incompatible after long-term use of the transmission shaft, the locking screw 8 can be loosened. At this time, the three movable fan-shaped petals 4 are radially adjusted along the trapezoidal groove 6 through the trapezoidal guide rail 5 under the action of the contraction elastic force of the rubber tube 10, and are realigned with the three fixed fan-shaped petals 3. The accuracy can be improved by tightening the locking screw 8 again.

[0028] Among them, the three fixed fan-shaped petals 3 and the three movable fan-shaped petals 4 can be made from a steel pipe through wire cutting, so that the contact surface angles of the fixed fan-shaped petals 3 and the movable fan-shaped petals 4 are adapted to each other, thereby improving the transmission accuracy.

[0029] Furthermore, the outer circumferential surfaces of the three fixed sector-shaped petals 3 are provided with through holes, and the oil filling cups 11 are embedded in the through holes. The inclined surfaces on both sides of the three fixed sector-shaped petals 3 are provided with oil guide grooves 12, and the oil filling cups 11 are connected to the oil guide grooves 12.

[0030] Therefore, lubricating grease can be injected into the oil guide groove 12 through the oil filling cup 11 to lubricate the contact surfaces of the three fixed fan-shaped petals 3 and the three movable fan-shaped petals 4, so that the three fixed fan-shaped petals 3 and the three movable fan-shaped petals 4 can maintain smooth relative movement and the contact surfaces of the two will not rust.

[0031] Furthermore, the left end of the left wheel disc 1 and the right end of the right wheel disc 2 are both coaxially fixedly connected with an extension shaft 13 , and the end surfaces of the two extension shafts 13 are both fixedly connected with flanges 14 .

[0032] Among them, the left wheel disc 1 is connected to the engine through the extension shaft 13 and the flange 14 connected thereto, and the right wheel disc 2 is connected to the drive wheel through the extension shaft 13 and the flange 14 connected thereto. At this time, the power of the engine is transmitted to the drive wheel through this high-precision transmission shaft.

[0033] Furthermore, the outer circumferential surfaces of the three movable fan-shaped petals 4 protrude from the outer circumferential surfaces of the three fixed fan-shaped petals 3 by one millimeter to five millimeters.

[0034] Therefore, when the rubber tube 10 contracts, the elastic force can always be applied to the outer circumferential surfaces of the three movable fan-shaped petals 4, so that the side surfaces of the movable fan-shaped petals 4 are closely fitted with the side surfaces of the fixed fan-shaped petals 3, thereby maintaining the above-mentioned radial accuracy.

[0035] Furthermore, the rubber tube 10 is a bellows tube, and the outer circumference of the three fixed fan-shaped petals 3 is provided with a corrugated groove, and the inner hole convex rib of the rubber tube 10 is adapted to be embedded in the corrugated groove. In this way, the rubber tube 10 can be firmly nested in the outer circumference of the three fixed fan-shaped petals 3 without moving back and forth and causing it to fall off.

[0036] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-precision transmission shaft for the load-carrying industry, comprising a left wheel disc (1) and a right wheel disc (2), characterized in that: The left wheel disc (1) and the right wheel disc (2) are coaxially arranged. Three fixed fan-shaped petals (3) are equally fixed on the right edge of the left wheel disc (1). The angles of the two sides of the three fixed fan-shaped petals (3) are all 60 degrees. A movable fan-shaped petal (4) is movably connected between two adjacent fixed fan-shaped petals (3). The angles of the two sides of the three movable fan-shaped petals (4) are all 60 degrees. The right end centers of the three movable fan-shaped petals (4) are all fixedly connected with a trapezoidal guide rail (5). The central axis of the trapezoidal guide rail (5) is equal to the angles of the two sides of the movable fan-shaped petal (4). The left side surface of the right wheel disc (2) is equally divided into three trapezoidal guide rails. The trapezoidal guide rail (5) has a groove (6), the inclination of the outer camber surface of the trapezoidal guide rail (5) is the same as the inclination of the inner camber surface of the trapezoidal groove (6), and the three movable fan-shaped petals (4) are respectively positioned and connected to the left side of the right wheel disc (2) through the trapezoidal guide rails (5) and the trapezoidal grooves (6) that are adapted and embedded with each other; three waist-shaped grooves (7) are evenly spaced on the right wheel disc (2), and two locking screws (8) are inserted in each of the three waist-shaped grooves (7). The right end of the trapezoidal guide rail (5) is provided with two locking screw holes (9), and the two locking screws (8) are adapted to be screwed into the corresponding locking screw holes (9), and the outer circumferential surfaces of the three movable fan-shaped petals (4) are sleeved with rubber tubes (10).

2. The high-precision transmission shaft for the load-carrying industry according to claim 1, characterized in that: The outer circumferential surfaces of the three fixed fan-shaped petals (3) are each provided with a perforation, an oil filling cup (11) is embedded and connected in the perforation, the inclined surfaces on both sides of the three fixed fan-shaped petals (3) are each provided with an oil guide groove (12), and the oil filling cup (11) is connected to the oil guide groove (12).

3. The high-precision transmission shaft for the load-carrying industry according to claim 1, characterized in that: The left end of the left wheel disc (1) and the right end of the right wheel disc (2) are both coaxially fixedly connected with an extension shaft (13), and the end surfaces of the two extension shafts (13) are both fixedly connected with flanges (14).

4. The high-precision transmission shaft for the load-carrying industry according to claim 1, characterized in that: The outer circumferential surfaces of the three movable fan-shaped petals (4) protrude from the outer circumferential surfaces of the three fixed fan-shaped petals (3) by one to five millimeters.

5. The high-precision transmission shaft for the load-carrying industry according to claim 1, characterized in that: The rubber tube (10) is a corrugated tube, and the outer circumferential surfaces of the three fixed fan-shaped petals (3) are provided with corrugated grooves, and the inner hole convex ribs of the rubber tube (10) are adapted to be embedded in the corrugated grooves.

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