A universal cross shaft structure for transmission shaft end of heavy-duty equipment

Abstract

A universal cross shaft structure for the transmission shaft end of heavy-duty equipment includes a joint body, a bearing sleeve, a cross shaft and a bearing sleeve anti-detachment assembly, the bearing sleeve anti-detachment assembly is provided with a first retaining ring, a second retaining ring, a fastening bolt and an elastic support member, the first retaining ring and the second retaining ring are stacked and arranged in the bearing hole of the joint body, the elastic support member is arranged at the end of the bearing sleeve, the first retaining ring located on the outside is circumferentially fixed to the bearing hole, and the fastening bolt passes through the first retaining ring and the second retaining ring and rotates to contact the elastic support member. The main advantages of the present invention are as follows: 1. Two retaining rings are provided, and the structure in which the first retaining ring is meshed with the bearing hole transfers most of the shear force acting on the fastening bolt during the transmission process to the connection position between the retaining ring and the joint body, greatly reducing the shear force borne by the fastening bolt; 2. A disc spring is provided on the bearing sleeve, and the fastening bolt eliminates the gap under the action of the disc spring during the transmission process, avoiding axial impact, and improving the service life of the fastening bolt and the transmission stability.

Description

Technical Field

[0001] The invention relates to a transmission component connection structure, in particular to a transmission shaft end universal cross shaft structure for heavy-load equipment. Background Art

[0002] Most of the iron and steel metallurgical equipment is heavy-duty transmission. For example, in the mechanical power transmission of steel rolling equipment, the power is transmitted by the drive shaft. When one or both ends of the drive shaft need to move radially, the drive shaft will swing at an angle. At this time, the two ends of the drive shaft need to have an intermediate link with a swing angle to transition. Commonly used connecting structural parts are drum gear coupling connection and universal cross joint assembly connection. The drum gear coupling connection only allows the swing angle of the rotating shaft to be no more than 3°, while the universal cross joint assembly connection allows the drive shaft to have a larger swing angle. The roughing mill rolls have a large amount of pressure reduction (200mm), the roll gap changes greatly, and the swing angle of the drive shaft also increases accordingly, so the main drive shaft of the roughing mill is generally connected by a universal cross joint assembly. There is a universal cross joint assembly between the main drive shaft of the roughing mill and the motor and between the main drive shaft and the roll. The structure of the cross joint assembly includes the joint body, the cross shaft body, the bearing sleeve, the rolling element and the bearing sleeve anti-slip fixing parts. The rolling element includes the long rolling element and the short rolling element. The long rolling element is used to bear the torque of the transmission system, and the short rolling element is used to bear the centrifugal force when the transmission shaft rotates. The bearing sleeve anti-slip fixing parts are mostly spring collar structures such as Fig.12 As shown, bolts and adjusting washers can also be used to directly tighten the Fig.13 As shown. However, both structures have problems. In the spring retaining ring structure, a certain gap must be left between the outer end face of the bearing sleeve and the inner end face of the spring retaining ring, otherwise the spring retaining ring cannot be installed. Even if it can be installed forcibly, the short rolling element will quickly wear and then a gap will appear. When a gap appears between the retaining ring and the bearing sleeve, the retaining ring will be broken by the impact force; because the spring retaining ring needs to be compressed and deformed before it can be installed in the slot, the strength of the retaining ring cannot be too high, so the spring retaining ring is frequently broken by the impact. In the bolt + pressure plate + adjustment washer direct clamping structure, although the gap between the bearing sleeve and the pressure plate can be adjusted to zero or negative gap, the gap value adjustment is not easy to grasp. In addition, the space position of this part is limited, and the bolt diameter is limited, so the restraint force on the bearing sleeve is also limited. The fastening bolts are subject to axial impact and shear force, and frequent fracture is inevitable. Summary of the invention

[0003] The purpose of the present invention is to overcome the drawbacks of the prior art and provide a universal cross shaft structure for a transmission shaft end of heavy-duty equipment, which greatly improves the connection strength and service life.

[0004] The purpose of the present invention is achieved by the following technical solutions:

[0005] A universal cross shaft structure for the transmission shaft end of heavy-duty equipment includes a joint body, a bearing sleeve and a cross shaft, each shaft head of the cross shaft is equipped with a bearing sleeve, a rolling body is provided between the shaft head and the bearing sleeve, the bearing hole of the joint body is sleeved outside the bearing sleeve, the cross shaft structure also includes a bearing sleeve anti-slip assembly, the bearing sleeve anti-slip assembly is provided with a first retaining ring, a second retaining ring, a fastening bolt and an elastic support member, the first retaining ring and the second retaining ring are stacked and arranged in the bearing hole of the joint body, the elastic support member is arranged at the end of the bearing sleeve, the first retaining ring located on the outside is circumferentially fixed to the bearing hole, the fastening bolt passes through the first retaining ring and rotates with the second retaining ring to contact the elastic support member.

[0006] The above-mentioned universal cross shaft structure for the transmission shaft end of heavy-load equipment, the bearing hole of the joint body is sequentially arranged with the first retaining ring hole and the second retaining ring hole from the outside to the inside, the second retaining ring hole is a cylindrical light hole, the hole wall of the first retaining ring hole is evenly distributed with internal teeth, the outer periphery of the first retaining ring and the second retaining ring is evenly distributed with external teeth, the number of teeth and the tooth shape of the external teeth of the first retaining ring and the second retaining ring are the same, the external teeth of the first retaining ring are matched and meshed with the internal teeth of the first retaining ring hole, the first retaining ring is evenly distributed with bolt locating holes, and the positions of each bolt locating hole correspond one by one to the positions of each external tooth of the first retaining ring, the second retaining ring is evenly distributed with threaded holes, and the positions of each threaded hole correspond one by one to the positions of each external tooth groove of the second retaining ring, and the inner diameter of the threaded hole is smaller than the inner diameter of the bolt locating hole.

[0007] The above-mentioned universal cross shaft structure for the transmission shaft end of heavy-load equipment, the elastic support member is a disc spring, the disc spring blind holes are evenly distributed on the bearing sleeve, the disc spring is located in the disc spring blind hole, and the inner diameter of the disc spring blind hole is larger than the inner diameter of the threaded hole.

[0008] The above-mentioned universal cross shaft structure for the transmission shaft end of heavy-load equipment has three sections of fastening bolts, which are a positioning section, a threaded section and a disc spring limiting section respectively. The positioning section is close to the bolt head, and the positioning section is clearance-matched with the bolt positioning hole of the first retaining ring. The threaded section is matched and screwed with the threaded hole of the second retaining ring, and the disc spring limiting section is matched and inserted into the disc spring hole.

[0009] In the above-mentioned universal cross shaft structure for the transmission shaft end of heavy-load equipment, the length of the positioning section in the fastening bolt is less than the thickness of the first retaining ring, the length of the threaded section is greater than the thickness of the second retaining ring, and the length of the disc spring limiting section is less than the depth of the disc spring blind hole.

[0010] In the above-mentioned universal cross shaft structure for the transmission shaft end of heavy-duty equipment, chamfers are arranged on the outer end faces of the first retaining ring and the second retaining ring.

[0011] In the universal cross shaft structure at the transmission shaft end of the heavy-duty equipment, an empty knife groove is provided between the first retaining ring hole and the second retaining ring hole.

[0012] In the above-mentioned universal cross shaft structure for the transmission shaft end of heavy-load equipment, the height of the disc spring in the uncompressed state matches the depth of the blind hole of the disc spring, and the small opening of the uppermost disc spring contacts the bottom shoulder of the fastening bolt.

[0013] The present invention improves the bearing sleeve anti-slip assembly to solve the problem that the universal cross shaft structure of heavy-duty transmission is prone to damage. Its main advantages are as follows: 1. The first and second retaining rings are stacked, and the shear force acting on the fastening bolts during the transmission process is mostly transferred to the connection position between the retaining rings and the joint body through the structure of the first retaining ring meshing with the bearing hole, which greatly reduces the shear force borne by the fastening bolts; 2. The disc spring blind hole and disc spring are set on the bearing sleeve, and the fastening bolts elastically press the bearing sleeve. During the transmission process, the fastening bolts eliminate the gap under the action of the spring, avoid axial impact, increase the service life of the fastening bolts, and improve the stability of the universal cross shaft transmission of heavy-duty transmission. The present invention is used at both ends of the main transmission shaft of the rough rolling mill, which greatly improves the normal operation time of the main transmission shaft, significantly reduces the equipment failure rate, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0017] Figure 3 It is a schematic diagram of the structure of the joint body;

[0018] Figure 4 Figure 3 A top view of

[0019] Figure 5 is a schematic diagram of the structure of the first retaining ring;

[0020] Figure 6 yes Figure 5 A top view of

[0021] Figure 7 Schematic diagram of the structure of the second retaining ring;

[0022] Figure 8 yes Figure 7 A top view of

[0023] Fig. 9 It is a schematic diagram of the structure of the fastening bolt;

[0024] Fig.10 It is a schematic diagram of the structure of the bearing sleeve;

[0025] Fig.11It is a schematic diagram of the structure of the bearing sleeve locating pin;

[0026] Fig.12 It is a schematic diagram of an existing bearing sleeve anti-dropping component being a spring clamp ring structure;

[0027] Fig.13 The utility model is a schematic diagram of an existing bearing sleeve anti-dropping component comprising a bolt and an adjusting gasket structure.

[0028] The numbers in the figure are: 1. first retaining ring, 1-1. bolt locating hole, 2. second retaining ring, 2-1. threaded hole, 3. fastening bolt, 3-1. locating section, 3-2. threaded section, 3-3. disc spring limiting section, 4. bearing sleeve, 4-1. spring blind hole, 5. joint body, 5-1. first retaining ring hole, 5-2. second retaining ring hole, 5-3. empty knife groove, 6. cross shaft, 7. rolling element, 8. disc spring, 9. bearing sleeve locating pin. DETAILED DESCRIPTION

[0029] See also Figure 1 , Figure 2 The present invention includes a joint body 5, a bearing sleeve 4 and a cross shaft 6. The bearing sleeve is installed on each shaft head of the cross shaft. The shaft head and the bearing sleeve of the cross shaft are assembled in the bearing hole of the joint body. A rolling body 7 is arranged between the shaft head of the cross shaft and the bearing sleeve. The rolling body includes a long rolling body and a short rolling body. The bearing sleeve is fixed by a bearing sleeve anti-detachment assembly. The bearing sleeve anti-detachment assembly is provided with a first retaining ring 1, a second retaining ring 2, a fastening bolt 3 and an elastic support member. In the illustrated embodiment, the elastic support member is a disc spring 8. The first retaining ring and the second retaining ring are stacked and arranged at the outer end of the bearing hole of the joint body. The disc spring is arranged at the end of the bearing sleeve. The fastening bolt passes through the first retaining ring and rotates with the second retaining ring to contact the elastic support member. The first retaining ring is circumferentially fixed to the bearing hole.

[0030] See also Figure 3-Figure 8 , the bearing hole is provided with a first retaining ring hole 5-1 and a second retaining ring hole 5-2 from outside to inside. Among them, the second retaining ring hole is a light hole, and trapezoidal internal teeth are evenly distributed on the hole wall of the first retaining ring hole. The inner diameter of the first retaining ring hole matches the inner diameter of the second retaining ring hole. An empty knife groove 5-3 is provided between the first retaining ring hole and the second retaining ring hole. The diameter of the empty knife groove is slightly larger than the major diameter of the first retaining ring hole, which is used for the cutting of the internal gear processing. Trapezoidal external teeth are evenly distributed on the outer circumference of the first retaining ring 1 and the second retaining ring 2. The number and shape of the external teeth of the first retaining ring and the second retaining ring are the same. The external teeth of the first retaining ring and the second retaining ring are matched and meshed with the internal teeth of the first retaining ring hole. Bolt positioning holes 1-1 are evenly distributed on the first retaining ring, and the positions of each bolt positioning hole correspond to the positions of each external tooth of the first retaining ring one by one; threaded holes 2-1 are evenly distributed on the second retaining ring, and the positions of each threaded hole correspond to the positions of each external tooth groove of the second retaining ring one by one, and the inner diameter of the threaded hole is smaller than the inner diameter of the bolt positioning hole.

[0031] See also Figure 2 , Fig.10 The disc spring blind holes 4-1 are evenly distributed on the end surface of the bearing sleeve 4. The number and distribution of the disc spring blind holes match the number and distribution of the threaded holes of the second retaining ring. The disc spring is installed in the disc spring blind hole, and the inner diameter of the disc spring blind hole is larger than the inner diameter of the threaded hole.

[0032] See also Figure 2 , Fig. 9 The fastening bolt 3 is divided into three sections, which are the positioning section 3-1, the threaded section 3-2 and the disc spring limiting section 3-3. The positioning section is close to the bolt head. The positioning section is matched with the bolt positioning hole of the first retaining ring to play a positioning role. The length of the positioning section is less than the thickness of the first retaining ring; the threaded section is matched and screwed with the threaded hole of the second retaining ring to play a locking role. The length of the threaded section is greater than the thickness of the second retaining ring; the disc spring limiting section is matched and inserted into the disc spring blind hole. The length of the disc spring limiting section is less than the depth of the disc spring blind hole. The height of the disc spring in the uncompressed state matches the depth of the disc spring blind hole, and the small opening of the uppermost disc spring contacts the bottom shoulder of the threaded section of the fastening bolt.

[0033] The bearing sleeve anti-detachment assembly of the present invention adopts the structure of the above-mentioned two retaining rings and elastic support parts. The first retaining ring solves the problem of circumferential constraint of the fixing part. Through the structure of the first retaining ring meshing with the joint body, most of the shear force acting on the fastening bolt during the transmission process is transferred to the connection position between the first retaining ring and the joint body, which greatly reduces the shear force borne by the fastening bolt; the second retaining ring is used to constrain the axial force of the bearing sleeve and lock the fastening bolt. Through the setting of the disc spring, the fastening bolt elastically presses the bearing sleeve. During the transmission process, the fastening bolt eliminates the gap under the action of the spring, so that the short rolling element, the bearing sleeve and the cross shaft still have zero gap after wear, avoiding axial impact, improving the service life of the fastening bolt, and improving the stability of the universal cross shaft transmission of heavy-load transmission.

[0034] The assembly process of the present invention is as follows: 1. Install the bearing sleeve. To ensure that the blind hole of the disc spring of the bearing sleeve is aligned with the bolt positioning hole of the first retaining ring after assembly, two bearing sleeve positioning pins 9 are symmetrically installed in the blind hole of the disc spring, such as Fig.11As shown. The large diameter of the lower part of the bearing sleeve locating pin matches the blind hole of the disc spring, and the small diameter of the upper part of the bearing sleeve locating pin matches the bolt locating hole of the first retaining ring. Insert the upper part of the bolt locating hole of the first retaining ring, rotate the first retaining ring until the trapezoidal teeth of the first retaining ring are in place, and the position of the bearing sleeve is adjusted appropriately at this time, and the first retaining ring and the bearing sleeve locating pin are taken out; 2. Install the butterfly spring, and install the butterfly spring in the blind hole of the disc spring of the bearing sleeve; 3: Install the second retaining ring, and the chamfer of the trapezoidal outer teeth of the second retaining ring faces outward. After the second retaining ring is in place, it is rotated 180° / teeth number angle, and the second retaining ring is axially limited by the first retaining ring hole, and the threaded hole of the second retaining ring corresponds to the bolt locating hole of the first retaining ring; 4. Install the first retaining ring, and the outer teeth of the first retaining ring mesh with the inner teeth of the first retaining ring hole; 5. Install the fastening bolt, and tighten the fastening bolt after the disc spring limiting section of the fastening bolt enters the inner hole of the disc spring.

[0035] The invention is suitable for the universal cross shaft structure of the transmission shaft end of various heavy-load equipment.

Claims

1. A universal cross shaft structure for the transmission shaft end of heavy-duty equipment, comprising a joint body, a bearing sleeve and a cross shaft, each shaft head of the cross shaft is equipped with a bearing sleeve, a rolling body is arranged between the shaft head and the bearing sleeve, and the bearing hole of the joint body is sleeved outside the bearing sleeve, characterized in that: It also includes a bearing sleeve anti-detachment assembly, which is provided with a first retaining ring, a second retaining ring, a fastening bolt and an elastic support member. The first retaining ring and the second retaining ring are stacked and arranged in the bearing hole of the joint body, and the elastic support member is arranged at the end of the bearing sleeve. The first retaining ring located on the outside is circumferentially fixed to the bearing hole, and the fastening bolt passes through the first retaining ring and is rotated with the second retaining ring to contact and press the elastic support member.

2. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 1, characterized in that: The bearing hole of the joint body is sequentially provided with a first retaining ring hole and a second retaining ring hole from the outside to the inside. The second retaining ring hole is a cylindrical light hole. Internal teeth are evenly distributed on the hole wall of the first retaining ring hole. External teeth are evenly distributed on the outer peripheries of the first retaining ring and the second retaining ring. The number and shape of the external teeth of the first retaining ring and the second retaining ring are the same. The external teeth of the first retaining ring match and mesh with the internal teeth of the first retaining ring hole. Bolt locating holes are evenly distributed on the first retaining ring, and each bolt locating hole corresponds to the position of each external tooth of the first retaining ring one by one. Threaded holes are evenly distributed on the second retaining ring, and the position of each threaded hole corresponds to the position of each external tooth groove of the second retaining ring one by one. The inner diameter of the threaded hole is smaller than the inner diameter of the bolt locating hole.

3. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 2, characterized in that: The elastic support member is a disc spring, and disc spring blind holes are evenly distributed on the bearing sleeve. The disc spring is located in the disc spring blind hole, and the inner diameter of the disc spring blind hole is larger than the inner diameter of the threaded hole.

4. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 3, characterized in that: The fastening bolt is composed of three sections, which are a positioning section, a threaded section and a disc spring limiting section. The positioning section is close to the bolt head, and the positioning section is clearance-matched with the bolt positioning hole of the first retaining ring. The threaded section is matched and screwed with the threaded hole of the second retaining ring, and the disc spring limiting section is matched and inserted into the disc spring hole.

5. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 4, characterized in that: The length of the positioning section in the fastening bolt is less than the thickness of the first retaining ring, the length of the threaded section is greater than the thickness of the second retaining ring, and the length of the disc spring limiting section is less than the depth of the disc spring blind hole.

6. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 5, characterized in that: The outer end surface of the second retaining ring is provided with a chamfer.

7. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 6, characterized in that: An empty knife groove is arranged between the first retaining ring hole and the second retaining ring hole.

8. The universal cross shaft structure for a transmission shaft end of heavy-duty equipment according to claim 7, characterized in that: The height of the disc spring in the uncompressed state matches the depth of the disc spring blind hole, and the small opening of the uppermost disc spring contacts the bottom shoulder of the fastening bolt.

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