Spline shaft and spline sleeve connecting structure, transmission system and engineering vehicle

Abstract

The utility model discloses a spline shaft and spline housing connecting structure, a transmission system and an engineering vehicle. The spline shaft and spline housing connecting structure comprises a spline shaft, a spline housing and at least one set screw. The spline shaft is mainly composed of a circular shaft and a tooth structure I located on the radial peripheral face of the circular shaft. A groove structure is arranged on the tooth top circular face of the tooth structure I. The spline housing is mainly composed of an annular shaft and a tooth structure II located on the radial inner circumferential face of the annular shaft, a hole structure composed of an unthreaded hole and a threaded hole is arranged on the spline housing, the spline shaft is sleeved with the spline housing, and the hole structure and the groove structure are coaxially arranged; the set screw is screwed in the threaded hole after penetrating through the unthreaded hole in the spline sleeve, a part of the set screw is located in the groove structure, and then axial fixation between the spline shaft and the spline sleeve is achieved. Structural improvement and fastening connection are performed inside the engaged connection of the spline shaft and the spline housing, so that the connection of the spline shaft and the spline housing is ensured on the basis of the existing radial and circumferential spline engagement, and the axial fixation is enhanced.

Description

Technical Field

[0001] This utility model relates to a connection structure between a spline shaft and a spline sleeve, belonging to the field of engineering vehicle technology. Background Technology

[0002] During the operation of mechanical equipment, there is often a process of drawing some driving force from the power source and transmitting it to the mechanical working device at the rear of the machine. The mechanical working device uses the drawn driving force to achieve various purposes, such as lifting and traction. For example, in an articulated dump truck, a drive shaft is configured between the engine power take-off port and the hydraulic main pump. It is usually used in conjunction with a power take-off unit to transmit the torque output by the engine to the hydraulic main pump device to achieve lifting of the cargo box and other operations. In the entire operation process, the splined sleeve at the rear end of the drive shaft with power take-off function is engaged with the splined shaft of the mechanical working device. In the existing technical solution, the technology to prevent the spline connection between the two from loosening is a disconnectable splined sleeve. In this solution, the drive shaft and the rear working device are usually connected by a disconnectable splined sleeve. During the use of vehicle equipment, due to the existence of harsh working conditions, the axial extension and contraction of the drive shaft is large. The additional axial force of the disconnectable splined sleeve in the existing solution is insufficient, and the drive shaft has an abnormal phenomenon of unbalanced wobble. In severe cases, it can cause the spline connection of the drive shaft to loosen, causing damage to the working parts around the drive shaft. Even worse, it can damage the engine and cause the entire machine to malfunction, which can easily cause serious consequences. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a connection structure for a spline shaft and a spline sleeve. The structure is improved and the connection is tightened within the meshing connection between the spline shaft and the spline sleeve, providing an axial fixing device to ensure that the connection between the two is based on the existing radial and circumferential spline meshing, while strengthening the axial fixation.

[0004] This utility model is achieved according to the following technical solution:

[0005] In a first aspect, this utility model provides a connection structure for a splined shaft and a splined sleeve, comprising a splined shaft, a splined sleeve, and at least one set screw; the splined shaft mainly consists of a round shaft and a tooth structure I located on the radial outer circumferential surface of the round shaft, wherein at least one groove structure is provided on the tooth tip circular surface of the tooth structure I; the splined sleeve mainly consists of an annular shaft and a tooth structure II located on the radial inner circumferential surface of the annular shaft, wherein at least one hole structure is provided on the splined sleeve, and the splined sleeve is fitted onto the splined shaft, wherein one hole structure corresponds to one groove structure arranged coaxially with it; the hole structure is divided into two sections. The first section is a light hole and the second section is a threaded hole. The light hole extends inward from the radial outer circumference of the annular shaft to the tooth structure II, passes through the tooth structure II and extends again to the annular shaft. The cross-section of the area of ​​the light hole and tooth structure II is an arc-shaped surface. The threaded hole is arranged coaxially with the light hole and extends inward from the light hole into the annular shaft. After the set screw passes through the light hole in the spline sleeve, it is tightened in the threaded hole. At this time, the set screw is located in the area of ​​tooth structure II, and part of the set screw is located in the groove structure, thereby realizing the axial fixation between the spline shaft and the spline sleeve.

[0006] In some embodiments, the number of groove structures is not less than two, which are evenly and alternately arranged along the circumference of the tooth tip circle on the tooth structure I. The number of hole structures is the same as the number of groove structures, and one groove structure and its corresponding hole structure are used to assemble one set screw.

[0007] In some embodiments, the number of groove structures is two, and the two groove structures are arranged symmetrically along the axial centerline of the spline shaft; the two hole structures are arranged symmetrically along the axial centerline of the spline sleeve; and the two set screws are arranged symmetrically along the centerline of the spline shaft.

[0008] In some embodiments, the number of groove structures is two, and the two groove structures are arranged symmetrically along the axial center line of the spline shaft; the two hole structures are arranged symmetrically along the axial center line of the spline sleeve; and the two set screws are arranged symmetrically along the axial center line of the spline shaft.

[0009] In some embodiments, the radial outer circumferential surface of the set screw at the location in the slot structure can be completely fitted with the radial inner circumferential surface of the slot structure.

[0010] In some embodiments, the spline sleeve has a radially outwardly extending flange on its radially outer circumferential surface at one axial end.

[0011] Secondly, this utility model provides a transmission system, comprising:

[0012] The above-described connection structure between the spline shaft and the spline sleeve;

[0013] A mechanical working device and a power take-off, wherein the splined shaft is fixed on the mechanical working device and serves as the input shaft of the mechanical working device;

[0014] The drive shaft has one axial end connected to the power take-off port of the power take-off unit, and the other axial end connected to a drive shaft flange. The drive shaft flange is fixed to the flange on the spline sleeve by fasteners. The torque output by the power take-off unit is transmitted to the mechanical working device through the connection structure between the spline shaft and the spline sleeve.

[0015] In some embodiments, the fastener consists of a plurality of bolts and a plurality of nuts; the plurality of bolts and the plurality of nuts are arranged circumferentially along the indexing circle on the flange of the drive shaft flange and the flange of the spline sleeve, respectively, and the drive shaft flange and the spline sleeve are fixed together by tightening the bolts with nuts.

[0016] Thirdly, this utility model provides an engineering vehicle, including the aforementioned transmission system.

[0017] In some embodiments, the power take-off is an engine, and the mechanical working device is a hydraulic main pump.

[0018] The beneficial effects of this utility model are:

[0019] This utility model provides a connection structure for a splined shaft and a splined sleeve. By improving and tightening the internal structure of the splined sleeve of the power take-off transmission shaft and the splined shaft of the mechanical working device, an axial fixing device is provided to ensure that the connection between the two is based on the existing radial and circumferential spline meshing, and the axial fixing is strengthened. This ensures that the power take-off transmission shaft and the mechanical working device are fixed axially along the splined shaft, and ensures that the splined sleeve of the transmission shaft and the splined shaft on the mechanical working device are tightly connected radially, circumferentially and axially. This greatly reduces the occurrence of mechanical failures caused by the relative movement of the splined sleeve and splined shaft due to axial slippage, reduces the failure rate and improves the stability and reliability of the power transmission process. Attached Figure Description

[0020] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram illustrating the connection between the disconnected spline sleeve and the spline shaft in current technology.

[0023] Figure 2 This is an exploded view of the transmission system of this utility model;

[0024] Figure 3 This is an enlarged view of the spline shaft groove structure of this utility model;

[0025] Figure 4 This is an enlarged view of the spline sleeve hole structure of this utility model;

[0026] Figure 5 This is a cross-sectional view of the spline mating fixing structure in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram showing the fit between the set screw and the groove structure on the spline shaft in an embodiment of this utility model.

[0028] Explanation of the reference numerals in the attached diagram: 1. Drive shaft flange; 2. Bolt; 3. Spline sleeve; 301. Hole structure; 4. Nut; 5. Set screw; 6. Mechanical working device; 6. Spline shaft; 601. Groove structure; 602.

[0029] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In practical applications, such as Figure 1 As shown, the disconnectable spline sleeve uses bolts and nuts on both sides to connect the disconnected spline sleeve. This anti-loosening technology can only ensure that the spline fit is fixed in the radial direction. Although the splines at both ends have an axial spline fit, considering the application, the axial force of the spline sleeve in this solution is insufficient. This will cause abnormal phenomena such as unbalanced wobble of the drive shaft. In severe cases, it will lead to loosening of the connection, causing damage to the working parts around the drive shaft, thereby triggering a series of failures and affecting the safe operation of the machinery.

[0034] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a connection structure between a splined shaft and a splined sleeve includes a splined shaft 601, a splined sleeve 3, and at least one set screw 5. The splined shaft 601 mainly consists of a round shaft and a tooth structure I located on the radial outer circumferential surface of the round shaft. At least one groove structure 602 is provided on the tooth tip circular surface of the tooth structure I. The splined sleeve 3 mainly consists of an annular shaft and a tooth structure II located on the radial inner circumferential surface of the annular shaft. At least one hole structure 301 is provided on the splined sleeve 3. The splined sleeve 3 is fitted onto the splined shaft 601. Each hole structure 301 corresponds to a groove structure 602 arranged coaxially with it. The hole structure 301 is divided into... The structure consists of two sections: a first section with a smooth hole and a second section with a threaded hole. The smooth hole extends inward from the radial outer circumference of the annular shaft to the tooth structure II, passes through the tooth structure II, and extends again to the annular shaft. The cross-section of the area of ​​the smooth hole and tooth structure II is an arc-shaped surface. The threaded hole is arranged coaxially with the smooth hole and extends inward from the smooth hole into the annular shaft. After the set screw 5 passes through the smooth hole in the spline sleeve 3, it is tightened in the threaded hole. At this time, the set screw 5 is located in the area of ​​tooth structure II, and part of the set screw 5 is located in the groove structure, thereby realizing the axial fixation between the spline shaft 601 and the spline sleeve 3.

[0035] As can be seen from the above, the connection structure of the spline shaft and spline sleeve provided by this utility model can ensure the connection between the transmission shaft and the mechanical working device. The spline fit fixing mechanism increases the axial restriction of the connection between the spline sleeve and the spline shaft, provides axial fastening force, prevents the spline shaft from moving in the spline sleeve, and avoids the imbalance and wobble of the transmission shaft caused by insufficient axial force due to harsh working conditions, which could lead to the loosening of the connection between the transmission shaft spline sleeve and the spline shaft. This can improve the operational stability and reliability of mechanical equipment.

[0036] In a further embodiment, the number of groove structures 602 is not less than two, which are evenly and alternately arranged along the circumference of the tooth tip circle on the tooth structure I. The number of hole structures 301 is the same as the number of groove structures 602. One groove structure 602 and its corresponding hole structure 301 are assembled together with a set screw 5.

[0037] The preferred option is as follows: Figure 5 As shown, there are two groove structures 602, which are arranged symmetrically along the axial centerline of the spline shaft 601; two hole structures 301 are arranged symmetrically along the axial centerline of the spline sleeve 3; and two set screws 5 are arranged symmetrically along the axial centerline of the spline shaft 601.

[0038] In the preferred embodiment, there are two groove structures 602, which are arranged symmetrically along the axial center line of the spline shaft 601; two hole structures 301 are arranged symmetrically along the axial center line of the spline sleeve 3; and two set screws 5 are arranged symmetrically along the axial center line of the spline shaft 601.

[0039] It should be noted that the spline fit fixing structure (composed of groove structure, hole structure and tightening screw) is arranged in the circumferential direction, and the number is greater than or equal to 1 to achieve the effect of fixing connection. In actual application, in order not to affect the dynamic balance state when the drive shaft is connected and operated, the number of spline fit fixing structures should be even and in a centrally symmetrical scheme with the spline shaft axis as the center.

[0040] It should be noted that the spline fitting fixing structure (consisting of a groove structure, a hole structure, and a set screw) is arranged within the length range of the spline bushing and the spline shaft, and its position should be as close as possible to the centerline of the spline shaft to ensure the fixing effect.

[0041] Further options, such as Figure 6 As shown, the radial outer circumferential surface of the set screw 5 located in the groove structure 602 can be completely fitted with the radial inner circumferential surface of the groove structure 602.

[0042] Further options, such as Figure 4 , Figure 5 As shown, the spline sleeve 3 has a radially outwardly extending flange on its radial outer circumferential surface at one axial end.

[0043] The transmission system provided by this utility model is described below. The engineering machinery described below and the connection structure of the spline shaft and spline sleeve described above can be referred to in correspondence.

[0044] like Figure 2 As shown, a transmission system includes the aforementioned connection structure between the spline shaft and spline sleeve, a mechanical working device 6, a power take-off (PTO), and a transmission shaft. The spline shaft 601 is fixed on the mechanical working device 6 and serves as the input shaft of the mechanical working device 6. One axial end of the transmission shaft is connected to the PTO's power take-off port, and the other axial end is connected to a transmission shaft flange 1. The transmission shaft flange 1 is fixed to the flange on the spline sleeve 3 by fasteners. The torque output by the PTO is transmitted to the mechanical working device 6 through the connection structure between the spline shaft 601 and the spline sleeve 3.

[0045] Preferred solutions, such as Figure 2 As shown, the fastener consists of multiple bolts 2 and multiple nuts 4; the multiple bolts 2 and multiple nuts 4 are arranged circumferentially along the indexing circle on the flange of the drive shaft flange 1 and the spline sleeve 3, respectively, and the drive shaft flange 1 and the spline sleeve 3 are fixed together by tightening the bolts 2 with the nuts 4.

[0046] During installation, the first step is to axially assemble the mechanical working device 6 with the splined shaft 601 having a groove structure 602 and the splined sleeve 3 having a hole structure 301, arranging them coaxially. The second step is to align the groove structure 602 on the splined shaft 601 and the hole structure 301 on the splined sleeve 3 axially, observing from both the top and bottom directions to ensure that they are aligned coaxially to avoid affecting the connection. The third step is to screw the set screws 5 into the channels formed by the hole structure 301 and the groove structure 602 from both the top and bottom directions to ensure a stable connection between the splined shaft 601 and the splined sleeve 3. The fourth step is to align the drive shaft flange 1 with the through hole on the splined sleeve 3, and then connect and tighten the bolts 2 and nuts 4 to achieve the final connection.

[0047] In summary, this utility model provides a connection structure for a splined shaft and a splined sleeve. By improving the internal structure and tightening the connection between the splined sleeve of the power take-off transmission shaft and the splined shaft of the mechanical working device, an axial fixing device is provided. This ensures that the connection between the two is based on the existing radial and circumferential spline meshing, and strengthens the axial fixation. This ensures that the power take-off transmission shaft and the mechanical working device are fixed axially along the splined shaft, and ensures that the splined sleeve of the transmission shaft and the splined shaft on the mechanical working device are tightly connected radially, circumferentially, and axially. This significantly reduces the occurrence of mechanical failures caused by the relative movement of the splined sleeve and splined shaft due to axial slippage, lowers the failure rate, and improves the stability and reliability of the power transmission process.

[0048] The engineering vehicle provided by this utility model is described below. The engineering vehicle described below and the transmission system described above can be referred to in correspondence.

[0049] The engineering vehicle provided by this utility model may include the transmission system as described in any of the above embodiments.

[0050] The beneficial effects achieved by the engineering vehicle provided by this utility model are consistent with the beneficial effects achieved by the transmission system provided by this utility model, so they will not be repeated here.

[0051] It should be noted that the above-mentioned engineering vehicles can be mining dump trucks; the power take-off uses an engine; the mechanical working device is generally a mechanical structure with functional requirements, such as lifting and traction. In this case, a hydraulic main pump is used to achieve the lifting operation.

[0052] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0053] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A connection structure between a splined shaft and a splined sleeve, characterized in that, include: The spline shaft is mainly composed of a round shaft and a tooth structure I located on the radial outer circumference of the round shaft. At least one groove structure is provided on the tooth tip circle surface of the tooth structure I. The spline sleeve mainly consists of an annular shaft and a tooth structure II located on the radial inner circumferential surface of the annular shaft. The spline sleeve has at least one hole structure. The spline sleeve is fitted onto the spline shaft, and each hole structure corresponds to a groove structure arranged coaxially with it. The hole structure is divided into two sections: The first section is a light aperture, which extends inward from the radial outer circumference of the annular shaft to the tooth structure II, passes through the tooth structure II and extends again to the annular shaft. The cross-section of the area of ​​the light aperture tooth structure II is an arc-shaped surface. The second section is a threaded hole, which is arranged coaxially with the optical hole and extends inward from the optical hole into the annular shaft; At least one set screw is inserted through the light hole in the spline sleeve and tightened in the threaded hole. At this time, the set screw is located in the area of ​​tooth structure II, and a part of the set screw is located in the groove structure, thereby realizing the axial fixation between the spline shaft and the spline sleeve.

2. The connection structure between a splined shaft and a splined sleeve according to claim 1, characterized in that: The number of groove structures is not less than two, and they are evenly and alternately arranged along the circumference of the tooth tip circle on the tooth structure I. The number of hole structures is the same as the number of groove structures. One groove structure and its corresponding hole structure are used to assemble one set screw.

3. The connection structure between a splined shaft and a splined sleeve according to claim 2, characterized in that: The number of groove structures is two, and the two groove structures are arranged symmetrically along the axial centerline of the spline shaft; the two hole structures are arranged symmetrically along the axial centerline of the spline sleeve; the two set screws are arranged symmetrically along the centerline of the spline shaft.

4. The connection structure between a splined shaft and a splined sleeve according to claim 2, characterized in that: The number of groove structures is two, and the two groove structures are arranged symmetrically along the axial center line of the spline shaft; the two hole structures are arranged symmetrically along the axial center line of the spline sleeve; and the two set screws are arranged symmetrically along the axial center line of the spline shaft.

5. The connection structure between a splined shaft and a splined sleeve according to claim 1, characterized in that: The outer radial surface of the set screw located in the groove structure can be completely fitted with the inner radial surface of the groove structure.

6. The connection structure between a splined shaft and a splined sleeve according to claim 1, characterized in that: The spline sleeve has a radially outwardly extending flange at one axial end on its radially outer circumferential surface.

7. A transmission system, characterized in that, include: The connection structure between the spline shaft and the spline sleeve as described in any one of claims 1 to 6; A mechanical working device and a power take-off, wherein the splined shaft is fixed on the mechanical working device and serves as the input shaft of the mechanical working device; The drive shaft has one axial end connected to the power take-off port of the power take-off unit, and the other axial end connected to a drive shaft flange. The drive shaft flange is fixed to the flange on the spline sleeve by fasteners. The torque output by the power take-off unit is transmitted to the mechanical working device through the connection structure between the spline shaft and the spline sleeve.

8. A transmission system according to claim 7, characterized in that: The fastener consists of multiple bolts and multiple nuts; the multiple bolts and multiple nuts are arranged circumferentially along the indexing circle on the flange of the drive shaft flange and the spline sleeve respectively, and the drive shaft flange and the spline sleeve are fixed together by tightening the bolts with nuts.

9. An engineering vehicle, characterized in that: Includes the transmission system as described in claim 7.

10. An engineering vehicle according to claim 9, characterized in that: The power take-off unit is an engine, and the mechanical working device is a hydraulic main pump.

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