CN112594291B - A universal cross shaft structure for transmission shaft end of heavy-duty equipment - Google Patents
A universal cross shaft structure for transmission shaft end of heavy-duty equipment Download PDFInfo
- Publication number
- CN112594291B CN112594291B CN202011537318.5A CN202011537318A CN112594291B CN 112594291 B CN112594291 B CN 112594291B CN 202011537318 A CN202011537318 A CN 202011537318A CN 112594291 B CN112594291 B CN 112594291B
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- Prior art keywords
- check ring
- hole
- disc spring
- heavy
- fastening bolt
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 44
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000010008 shearing Methods 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
- B21B35/142—Yielding spindle couplings; Universal joints for spindles
- B21B35/145—Hooke's joints or the like with each coupling part pivoted with respect to an intermediate member
-
- 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
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
The utility model provides a universal cross axle structure of drive shaft end for heavy-duty equipment, includes joint body, bearing housing and cross axle and bearing housing anticreep subassembly, and bearing housing anticreep subassembly is equipped with first retaining ring, second retaining ring, fastening bolt and elastic support piece, and first retaining ring, second retaining ring superpose setting are in the bearing hole of joint body, and elastic support piece sets up at the bearing housing tip, and first retaining ring and the bearing hole circumference that is located the outside are fixed, and fastening bolt passes first retaining ring and second retaining ring and revolves and touch and press elastic support piece. The invention has the main advantages that 1, two check rings are arranged, the structure that the first check ring is meshed with the bearing hole transfers most of the shearing force applied to the fastening bolt in the transmission process to the connection position of the check ring and the joint body, thereby greatly reducing the shearing force born by the fastening bolt, 2, a disc spring is arranged on the bearing sleeve, the fastening bolt eliminates the gap under the action of the disc spring in the transmission process, the axial impact is avoided, and the service life and the transmission stability of the fastening bolt are improved.
Description
Technical Field
The invention relates to a transmission member connecting structure, in particular to a universal cross shaft structure of a transmission shaft end for heavy-duty equipment.
Background
Most of ferrous metallurgical equipment is heavy-duty transmission, such as mechanical power transmission of steel rolling equipment, power is transmitted by a transmission shaft, when one end or two ends of the transmission shaft need to radially move, the transmission shaft swings at an angle immediately, and at the moment, the two ends of the transmission shaft need to have intermediate links capable of swinging at an angle for transition. The commonly used connection structures are crowned tooth coupling couplings and universal cross joint assemblies. The crowned coupling permits only a swivel angle of the swivel shaft of no more than 3, while the universal joint cross assembly coupling permits a larger swivel angle of the drive shaft. The roll reduction of the roughing mill is larger (200 mm), the roll gap change is large, and the swing angle of the transmission shaft is also increased, so that the main transmission shaft of the roughing mill is generally connected by a universal cross joint assembly. A universal cross joint assembly is arranged between the main transmission shaft and the motor of the roughing mill and between the main transmission shaft and the roller respectively. The structure of the cross joint assembly comprises joint bodies, cross shaft bodies, bearing sleeves, rolling bodies, bearing sleeve anti-drop fixing pieces and the like, wherein the rolling bodies comprise long rolling bodies and short rolling bodies, the long rolling bodies are used for bearing torsion of a transmission system, and the short rolling bodies are used for bearing centrifugal force when a transmission shaft rotates. Most of the bearing sleeve anti-drop fixing pieces are of spring collar structures as shown in fig. 12, and are directly pressed by bolts and adjusting gaskets as shown in fig. 13. Both of the above structures have problems. A certain gap is reserved between the outer end face of the bearing sleeve and the inner end face of the spring clamping ring, otherwise, the spring clamping ring cannot be installed, even if the spring clamping ring can be installed forcibly, short rolling bodies are worn out quickly and then have gaps, after the gaps appear between the clamping ring and the bearing sleeve, the clamping ring can be broken by impact force, the spring clamping ring can be installed in a clamping groove only by compressing and deforming the clamping ring, the strength of the clamping ring cannot be too high naturally, and therefore the spring clamping ring is frequently broken by impact. The bolt, the pressing plate and the adjusting washer directly compress tightly the structure, but the bearing sleeve and the pressing plate can be adjusted to be zero clearance or negative clearance, the clearance value adjustment is not easy to grasp, in addition, the space position of the part is limited, the diameter of the bolt is limited, so the restraining force on the bearing sleeve is limited, the fastening bolt is under the action of axial impact force and shearing force, and the fracture phenomenon frequently occurs is unavoidable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a universal cross shaft structure of a transmission shaft end for heavy-duty equipment, which is used for greatly improving the connection strength and prolonging the service life.
The invention aims at realizing the following technical scheme:
the utility model provides a drive shaft end universal cross axle structure for heavy-duty equipment, includes joint body, bearing housing and cross axle, and each spindle nose assembly bearing housing of cross axle is equipped with the rolling element between spindle nose and the bearing housing, and the bearing hole suit of joint body is outside the bearing housing, cross axle structure still includes bearing housing anticreep subassembly, bearing housing anticreep subassembly is equipped with first retaining ring, second retaining ring, fastening bolt and elastic support piece, and first retaining ring, second retaining ring superpose setting are in the bearing hole of joint body, and elastic support piece sets up at the bearing housing tip, and first retaining ring and bearing hole circumference that is located the outside are fixed, and fastening bolt passes first retaining ring and second retaining ring and revolves and touch and press elastic support piece.
Above-mentioned a drive axle head universal cross axle structure for heavy-duty equipment, the bearing hole of the joint body sets gradually first retaining ring hole from outside to interior, the second retaining ring hole is cylindrical unthreaded hole, equipartition internal tooth on the pore wall in first retaining ring hole, the external tooth of equipartition on the periphery of first retaining ring, the second retaining ring, external tooth number and the profile of tooth of first retaining ring are the same, the external tooth of first retaining ring and the internal tooth matching engagement in first retaining ring hole, equipartition bolt locating hole on the first retaining ring, the position one-to-one of each bolt locating hole and each external tooth of first retaining ring, the equipartition screw hole on the second retaining ring, the position one-to-one of each external tooth ditch of each screw hole and second retaining ring, the internal diameter of screw hole is less than the internal diameter of bolt locating hole.
Above-mentioned a drive axle head universal cross axle structure for heavy load equipment, elastic support piece is the dish spring, equipartition dish spring blind hole on the bearing housing, the dish spring is located the dish spring blind hole, and the internal diameter of dish spring blind hole is greater than the internal diameter of screw hole.
Above-mentioned a drive axle head universal cross axle structure for heavy load equipment, fastening bolt be three sections, and three sections are location section, screw thread section and dish spring spacing section in proper order, and the location section is close to the bolt head, and the location section is with the bolt locating hole clearance fit of first retaining ring, and screw thread section and the screw hole matching of second retaining ring are screwed, and the dish spring spacing section matches and inserts in the dish spring hole.
The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment is characterized in that the length of the positioning section in the fastening bolt is smaller than the thickness of the first check ring, the length of the threaded section is larger than the thickness of the second check ring, and the length of the disc spring limiting section is smaller than the depth of the disc spring blind hole.
The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment is characterized in that chamfers are arranged on the outer side end faces of the first check ring and the second check ring.
The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment is characterized in that a clearance groove is formed between the first check ring hole and the second check ring hole.
According to the universal cross shaft structure of the transmission shaft end for the heavy-duty equipment, the uncompressed state height of the disc springs is matched with the depth of the blind holes of the disc springs, and the small opening of the uppermost disc spring is contacted with the bottom shoulder of the fastening bolt.
The invention aims at solving the problem that the universal cross shaft structure of heavy-load transmission is easy to damage and improves the anti-drop component of the bearing sleeve, and has the main advantages that 1, the first check ring and the second check ring which are overlapped are arranged, and the shearing force applied to the fastening bolt in the transmission process is mostly transferred to the connection position of the check ring and the joint body through the structure that the first check ring is meshed with a bearing hole, so that the shearing force born by the fastening bolt is greatly reduced, 2, the disc spring blind hole and the disc spring are arranged on the bearing sleeve, the fastening bolt elastically compresses the bearing sleeve, the clearance is eliminated under the action of the spring in the transmission process, the axial impact is avoided, the service life of the fastening bolt is prolonged, and the stability of the universal cross shaft transmission of heavy-load transmission is improved. The invention is used at two ends of the main transmission shaft of the roughing mill, greatly improves the normal running time of the main transmission shaft, obviously reduces the failure rate of equipment and improves the production efficiency.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of the structure of the joint body;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic view of the structure of the first retainer ring;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a schematic view of the structure of the second retainer ring;
FIG. 8 is a top view of FIG. 7;
Fig. 9 is a schematic structural view of a fastening bolt;
FIG. 10 is a schematic structural view of a bearing housing;
FIG. 11 is a schematic view of the structure of a bearing housing dowel pin;
FIG. 12 is a schematic illustration of a prior art bearing housing anti-slip assembly in a spring collar configuration;
fig. 13 is a schematic view of a conventional bearing housing anti-drop assembly in the form of a bolt and an adjusting washer.
The numbers in the drawing are 1, a first retainer ring, 1-1, a bolt positioning hole, 2, a second retainer ring, 2-1, a threaded hole, 3, a fastening bolt, 3-1, a positioning section, 3-2, a threaded section, 3-3, a disc spring limiting section, 4, a bearing sleeve, 4-1, a spring blind hole, 5, a joint body, 5-1, a first retainer ring hole, 5-2, a second retainer ring hole, 5-3, a hollow cutter groove, 6, a cross shaft, 7, a rolling body, 8, a disc spring, 9 and a bearing sleeve positioning pin.
Detailed Description
Referring to fig. 1 and 2, the invention comprises a joint body 5, a bearing sleeve 4 and a cross shaft 6, wherein the bearing sleeve is arranged on each shaft head of the cross shaft, the shaft heads of the cross shaft and the bearing sleeve are assembled in a bearing hole of the joint body, and rolling bodies 7 are arranged between the shaft heads of the cross shaft and the bearing sleeve and comprise long rolling bodies and short rolling bodies. The bearing sleeve is fixed by a bearing sleeve anti-falling assembly, and the bearing sleeve anti-falling assembly is provided with a first check ring 1, a second check ring 2, a fastening bolt 3 and an elastic support piece, wherein the elastic support piece is a disc spring 8 in the illustrated embodiment. The first check ring and the second check ring are overlapped and arranged at the outer side end part of the joint body bearing hole, the disc spring is arranged at the end part of the bearing sleeve, the fastening bolt penetrates through the first check ring and the second check ring to rotate and touch and press the elastic supporting piece, and the first check ring is circumferentially fixed with the bearing hole.
Referring to fig. 3-8, the bearing hole is provided with a first check ring hole 5-1 and a second check ring hole 5-2 from outside to inside. Wherein, the second retaining ring hole is the unthreaded hole, and the trapezoidal internal tooth of equipartition is gone up to the pore wall in first retaining ring hole, and the internal diameter in first retaining ring hole matches with the internal diameter in second retaining ring hole, is equipped with empty sword groove 5-3 between first retaining ring hole and the second retaining ring hole, and the diameter in empty sword groove slightly is greater than the major diameter in first retaining ring hole for the play sword of internal tooth processing. The outer circumferences of the first check ring 1 and the second check ring 2 are uniformly provided with trapezoid external teeth, and the number of teeth of the external teeth and the tooth shape of the external teeth of the first check ring and the second check ring are the same. The external teeth of the first check ring and the second check ring are matched and meshed with the internal teeth of the first check ring hole. The first check ring is uniformly provided with bolt positioning holes 1-1, the positions of the bolt positioning holes and the outer teeth of the first check ring are in one-to-one correspondence, the second check ring is uniformly provided with threaded holes 2-1, the positions of the threaded holes and the positions of the tooth grooves of the outer teeth of the second check ring are in one-to-one correspondence, and the inner diameter of the threaded holes is smaller than that of the bolt positioning holes.
Referring to fig. 2 and 10, disc spring blind holes 4-1 are uniformly distributed on the end face of the bearing sleeve 4, the number and distribution of the disc spring blind holes are matched with those of the second check ring threaded holes, the disc springs are installed in the disc spring blind holes, and the inner diameter of the disc spring blind holes is larger than that of the threaded holes.
Referring to fig. 2 and 9, the fastening bolt 3 has three sections, namely a positioning section 3-1, a threaded section 3-2 and a disc spring limiting section 3-3, which are positioned close to the head of the bolt. The positioning section is in clearance fit with a bolt positioning hole of the first check ring, the positioning section is smaller than the thickness of the first check ring in length, the threaded section is matched and screwed with a threaded hole of the second check ring, the locking function is achieved, the length of the threaded section is larger than the thickness of the second check ring, the disc spring limiting section is matched and inserted into the disc spring blind hole, and the length of the disc spring limiting section is smaller than the depth of the disc spring blind hole. The height of the uncompressed state of the disc springs is matched with the depth of the blind holes of the disc springs, and the small opening of the uppermost disc spring is contacted with the bottom shoulder of the screw thread section of the fastening bolt.
The bearing sleeve anti-drop assembly adopts the structure that the two check rings are matched with the elastic supporting piece, the first check ring solves the problem of circumferential constraint of the fixing piece, most of the shearing force applied to the fastening bolt in the transmission process is transferred to the connection position of the first check ring and the joint body through the structure that the first check ring is meshed with the joint body, the shearing force born by the fastening bolt is greatly reduced, the second check ring is used for restraining the axial force of the bearing sleeve and locking the fastening bolt, the bearing sleeve is elastically pressed by the fastening bolt through the arrangement of the disc spring, the clearance of the fastening bolt is eliminated under the action of the spring in the transmission process, the short rolling body, the bearing sleeve and the cross shaft are still zero clearance after being worn, the axial impact is avoided, the service life of the fastening bolt is prolonged, and the stability of the universal cross shaft transmission of heavy-duty transmission is improved.
The assembly process of the invention is as follows, 1, a bearing sleeve is installed, and two bearing sleeve positioning pins 9 are symmetrically installed in a disc spring blind hole in order to ensure that the disc spring blind hole of the bearing sleeve is aligned with a bolt positioning hole of an assembled first check ring, as shown in figure 11. The major diameter department of bearing housing locating pin lower part matches with the dish spring blind hole, and the minor diameter department on bearing housing locating pin upper portion matches with the bolt locating hole of first retaining ring. The method comprises the steps of inserting the upper part of a first check ring bolt positioning hole, rotating a first check ring until the trapezoid teeth of the first check ring are positioned, at the moment, adjusting the position of a bearing sleeve to be proper, taking out the first check ring and the bearing sleeve positioning pin, installing a butterfly spring in a butterfly spring blind hole of the bearing sleeve, installing a second check ring, enabling a chamfer angle of the trapezoid external tooth part of the second check ring to face to the outer side, rotating 180 degrees/tooth number angle after the second check ring is positioned, axially limiting the second check ring through the first check ring hole, enabling a threaded hole of the second check ring to correspond to the bolt positioning hole of the first check ring, installing the first check ring, enabling external teeth of the first check ring to be meshed with internal teeth of the first check ring hole, installing a fastening bolt, and screwing the fastening bolt after a disc spring limiting section of the fastening bolt enters an inner hole of the disc spring.
The universal cross shaft structure is suitable for the universal cross shaft structure of the transmission shaft ends of various heavy-duty equipment.
Claims (8)
1. The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment comprises a joint body, a bearing sleeve and a cross shaft, wherein the bearing sleeve is assembled on each shaft head of the cross shaft, rolling bodies are arranged between the shaft heads and the bearing sleeve, a bearing hole of the joint body is sleeved outside the bearing sleeve.
2. The universal cross shaft structure of the transmission shaft end for heavy-duty equipment according to claim 1, wherein the bearing hole of the joint body is sequentially provided with a first check ring hole and a second check ring hole from outside to inside, the second check ring hole is a cylindrical smooth hole, inner teeth are uniformly distributed on the hole wall of the first check ring hole, outer teeth are uniformly distributed on the peripheries of the first check ring and the second check ring, the tooth numbers and tooth shapes of the outer teeth of the first check ring and the outer teeth of the second check ring are identical, the outer teeth of the first check ring are in matched engagement with the inner teeth of the first check ring hole, bolt positioning holes are uniformly distributed on the first check ring, each bolt positioning hole corresponds to each outer tooth of the first check ring one by one, threaded holes are uniformly distributed on the second check ring, the positions of each threaded hole correspond to each outer tooth groove of the second check ring one by one, and the inner diameter of each threaded hole is smaller than the inner diameter of each bolt positioning hole.
3. The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment according to claim 2, wherein the elastic supporting piece is a disc spring, disc spring blind holes are uniformly distributed on the bearing sleeve, the disc spring is positioned in the disc spring blind holes, and the inner diameter of the disc spring blind holes is larger than that of the threaded holes.
4. The universal cross shaft structure of the transmission shaft end for the heavy-duty equipment, as set forth in claim 3, characterized in that the fastening bolt is three sections, the three sections are a positioning section, a threaded section and a disc spring limiting section in sequence, the positioning section is close to the head of the bolt, the positioning section is in clearance fit with a bolt positioning hole of the first check ring, the threaded section is in matched screwing with a threaded hole of the second check ring, and the disc spring limiting section is matched and inserted into the disc spring hole.
5. The universal cross structure of the transmission shaft end for heavy-duty equipment according to claim 4, wherein the length of the positioning section in the fastening bolt is smaller than the thickness of the first check ring, the length of the threaded section is larger than the thickness of the second check ring, and the length of the disc spring limiting section is smaller than the depth of the disc spring blind hole.
6. The universal joint cross structure for the transmission shaft end of heavy-duty equipment according to claim 5, wherein the outer side end surface of the second check ring is provided with a chamfer.
7. The universal joint cross structure of the transmission shaft end for heavy-duty equipment according to claim 6, wherein a clearance groove is formed between the first check ring hole and the second check ring hole.
8. The universal joint cross structure of transmission shaft end for heavy-duty equipment according to claim 7, wherein the height of the uncompressed state of the disc springs is matched with the depth of the blind holes of the disc springs, and the small opening of the uppermost disc spring contacts with the bottom shoulder of the fastening bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537318.5A CN112594291B (en) | 2020-12-23 | 2020-12-23 | A universal cross shaft structure for transmission shaft end of heavy-duty equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537318.5A CN112594291B (en) | 2020-12-23 | 2020-12-23 | A universal cross shaft structure for transmission shaft end of heavy-duty equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112594291A CN112594291A (en) | 2021-04-02 |
| CN112594291B true CN112594291B (en) | 2025-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011537318.5A Active CN112594291B (en) | 2020-12-23 | 2020-12-23 | A universal cross shaft structure for transmission shaft end of heavy-duty equipment |
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| Country | Link |
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| CN (1) | CN112594291B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214367354U (en) * | 2020-12-23 | 2021-10-08 | 德龙钢铁有限公司 | A universal cross shaft structure for strengthening the anti-fall off transmission shaft end |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779282A (en) * | 2004-11-25 | 2006-05-31 | 马鞍山市泰尔重工有限公司 | Universal joint pin assembly of universal coupling |
| WO2007067249A1 (en) * | 2005-12-09 | 2007-06-14 | Fallbrook Technologies Inc. | Continuously variable transmission |
| CN202570759U (en) * | 2012-02-20 | 2012-12-05 | 宝山钢铁股份有限公司 | Rolling mill drum-type gear coupling for preventing moment shear force from overloading |
| CN103912570B (en) * | 2013-01-08 | 2016-03-02 | 黄天梵 | High elasticity spline stretches transmission shaft |
-
2020
- 2020-12-23 CN CN202011537318.5A patent/CN112594291B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN214367354U (en) * | 2020-12-23 | 2021-10-08 | 德龙钢铁有限公司 | A universal cross shaft structure for strengthening the anti-fall off transmission shaft end |
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| CN112594291A (en) | 2021-04-02 |
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