Connecting structure of transmission shaft and working device and engineering vehicle

Abstract

The utility model discloses a connecting structure of a transmission shaft and a working device and an engineering vehicle. The connecting structure comprises a transmission shaft flange arranged at the rear end of the transmission shaft, an output flange with a spline shaft sleeve, a spline shaft arranged on the working device and an axial locking structure. The transmission shaft flange and the output flange are assembled together through a fastener; the spline shaft is inserted into the spline shaft sleeve of the output flange; the axial locking structure comprises a pressing plate with a center hole and a connecting bolt, and the pressing plate and the spline shaft sleeve are coaxially arranged on the axial end face of the output flange. A connecting bolt penetrates through a center hole of the pressing plate and then is screwed in a center threaded hole in the axial end face of the spline shaft, and the pressing plate is tightly attached to the output flange; and a gap capable of ensuring that the connecting bolt has enough pre-tightening force is reserved between the pressing plate and the spline shaft. According to the technical scheme, the fault that the transmission shaft and the spline shaft fall off can be avoided, the fault rate is reduced, and the stability and reliability in the power transmission process are improved.

Description

Technical Field

[0001] The utility model relates to a connection structure between a transmission shaft and a working device, belonging to the technical field of engineering vehicles. Background Art

[0002] As a universal transmission device, the drive shaft plays an indispensable role in the process of power transmission. For example, in an articulated dump truck, the drive shaft configured between the engine power take-off port and the hydraulic main pump is usually used in conjunction with a power take-off. The torque output by the power source (usually the engine) is transmitted to the rear side of the machine through the drive shaft, and then connected to the hydraulic main pump device to achieve various purposes, such as lifting, towing, etc. In the process of using the drive shaft for power transmission, the existing technology to prevent the spline connecting the two from loosening is the disconnect spline sleeve, such as Figure 1 As shown, in this technical solution, the drive shaft and the rear-end working device are usually connected through a disconnect spline sleeve. During the use of vehicle equipment, due to the existence of harsh working conditions, the axial expansion and contraction of the drive shaft is large. The additional axial force of the disconnect spline sleeve in the existing solution is insufficient, and the drive shaft has an abnormal phenomenon of unbalanced deflection. In severe cases, it will cause the spline connection of the drive shaft to loosen, causing local damage to the working parts around the drive shaft, and even worse, it will damage the engine and cause the entire machine to be paralyzed, causing serious consequences. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a loose connection structure between a transmission shaft and a working device, which fixes the transmission shaft and the working device axially through an axial locking structure. A gap is left between the pressure plate in the axial locking structure and the spline shaft on the working device, which can ensure that the pre-tightening force on the connecting bolt is sufficient, ensuring that the spline sleeve of the transmission shaft is tightly connected to the spline shaft on the working device, and no axial slippage occurs, causing the spline shaft to move. The present invention can avoid the failure of the transmission shaft and the spline shaft falling off through the above technical scheme, reduce the failure rate, and improve the stability and reliability of the power transmission process.

[0004] The utility model is implemented according to the following technical solutions:

[0005] In the first aspect, the utility model provides a connection structure between a transmission shaft and a working device, comprising a transmission shaft flange and an output flange with a spline sleeve arranged at the rear end of the transmission shaft, a spline shaft arranged on the working device, and an axial locking structure for fixing the output flange and the spline shaft together; the transmission shaft flange and the output flange are assembled together by fasteners; the spline shaft is inserted into the spline sleeve of the output flange, and the two are engaged by a spline structure, so that the transmission shaft can rotate circumferentially with the spline shaft; the axial locking structure includes a pressure plate with a center hole and a connecting bolt, and the pressure plate and the spline sleeve are coaxially arranged on the axial end face of the output flange; the connecting bolt passes through the center hole of the pressure plate and is tightened in the center threaded hole on the axial end face of the spline shaft, so that the pressure plate is tightly attached to the output flange; a gap is left between the pressure plate and the spline shaft to ensure that the connecting bolt has sufficient preload force.

[0006] In some embodiments, the spline shaft and the spline sleeve are axially limited by a stop structure between the facing circumferential surfaces thereof, thereby leaving the gap between the spline shaft and the pressure plate.

[0007] In some embodiments, the root area of ​​the spline shaft is provided with a chamfered convex stop, and the spline sleeve is provided with a chamfered concave stop used in conjunction with the convex stop.

[0008] In some embodiments, the output flange is configured as a stepped hole at an axial end portion of the central hole facing the transmission shaft flange, and the pressure plate is arranged in the stepped hole.

[0009] In some embodiments, the outer edge area of ​​the drive shaft flange is provided with a circle of evenly spaced mounting holes I along the circumference, and the output flange is provided with a plurality of mounting holes II that are coaxially corresponding to the mounting holes I one by one. The fasteners are used in conjunction with the coaxially arranged mounting holes I and mounting holes II to fix the drive shaft flange and the output flange together.

[0010] In some embodiments, the fasteners are bolts and nuts, the bolts are passed through mounting holes I and II, and the drive shaft flange and the output flange are pressed together by tightening the nuts on the bolts.

[0011] In some embodiments, a gap of 2 mm to 5 mm is left between the pressure plate and the spline shaft.

[0012] In a second aspect, the present invention provides an engineering vehicle, comprising the above-mentioned connection structure between the transmission shaft and the working device.

[0013] In some embodiments, the engineering vehicle is an articulated dump truck, wherein the working device is a hydraulic pump mechanism.

[0014] Beneficial effects of the utility model:

[0015] The technical solution of the present invention can fully tighten the spline sleeve of the transmission shaft and the spline shaft of the working device in the axial direction, thereby avoiding the falling-off failure caused by the anti-loosening measures of bolt tightening only in the radial direction of the existing technical solution, reducing the failure rate here, and also ensuring the connection safety of the connection structure there, thereby improving the operating reliability of the mechanical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of this utility model and are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be derived from these drawings without inventive effort.

[0017] In the attached figure:

[0018] Figure 1 This is a schematic diagram of the connection between a disconnected spline sleeve and a spline shaft in the prior art;

[0019] Figure 2 This is an overall schematic diagram of the connection structure between the transmission shaft and the working device of the present utility model;

[0020] Figure 3 This is a cross-sectional view of the connection structure between the transmission shaft and the working device of the utility model;

[0021] Figure 4 for Figure 3 A magnified view of some of the structures in .

[0022] Description of the accompanying drawings: transmission shaft 1, transmission shaft flange 101, output flange 102, concave stop 103, working device 2, spline shaft 201, convex stop 202, axial locking structure 3, connecting bolt 301, pressure plate 302, bolt 4, nut 5.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] In actual application, Figure 1 As shown, the disconnected spline sleeve uses bolts and nuts on both sides to connect the disconnected spline sleeves. This anti-loosening technology can only ensure that the spline fit is fixed in the radial direction. Although the connecting splines at both ends have axial spline fit, combined with the application situation, the axial force of the spline sleeve of this solution is insufficient, and the abnormal phenomenon of unbalanced deflection of the transmission shaft will occur. In severe cases, it will lead to loose connection and cause extensive damage to the working parts around the transmission shaft, thereby triggering a series of faults and affecting the safe operation of the machinery.

[0028] Based on the shortcomings of the above technical solutions, such as Figure 2 、 Figure 3 、 Figure 4 As shown, the utility model provides a connection structure between a transmission shaft and a working device, comprising a transmission shaft flange 101 arranged at the rear end of the transmission shaft 1 and an output flange 102 with a spline sleeve, a spline shaft 201 arranged on the working device 2, and an axial locking structure 3 for fixing the output flange 102 and the spline shaft 201 together; the transmission shaft flange 101 and the output flange 102 are assembled together by fasteners; the spline shaft 201 is inserted into the spline sleeve of the output flange 102, and the two are engaged through a spline structure, so that the transmission The shaft 1 can rotate circumferentially along with the spline shaft 201; the axial locking structure 3 includes a pressure plate 302 with a center hole and a connecting bolt 301, and the pressure plate 302 and the spline sleeve are coaxially arranged on the axial end face of the output flange 102; the connecting bolt 301 passes through the center hole of the pressure plate 302 and is tightened in the center threaded hole on the axial end face of the spline shaft 201, so that the pressure plate 302 is tightly attached to the output flange 102; a gap is left between the pressure plate 302 and the spline shaft 201 to ensure that the connecting bolt 301 has sufficient preload force.

[0029] As can be seen from the above, the technical solution of the present invention is applied to the axial connection between the spline sleeve and the spline shaft 201 between the transmission shaft 1 and the working device 2, wherein the spline shaft 201 of the working device 2 is provided with an axial locking structure 3, which is implemented by a threaded hole on the spline shaft 201 in this solution, and can also be implemented by other axial locking methods, such as punching riveting, spot welding, radial expansion sleeves, etc. The connecting bolt 301 in the axial locking structure 3 passes through the pressure plate 302 and is connected to the threaded hole on the spline shaft 201, thereby fastening the spline shaft 201 to the spline sleeve in the axial direction. The technical solution of the present invention can ensure the reliability and safety of the connection between the transmission shaft 1 and the working device 2, and avoid the unbalanced deflection of the transmission shaft caused by insufficient axial force of the transmission shaft due to harsh working conditions, thereby causing the spline sleeve and the spline shaft to become loose.

[0030] It should be noted that the working device 2 is generally a mechanical structure with functional requirements, and the specific functional requirements refer to lifting, traction, etc. This embodiment adopts a hydraulic pump mechanism; the working device 2 is generally equipped with a spline shaft 201, and this spline shaft structure cooperates with the spline sleeve on the rear side of the front transmission shaft to transmit torque.

[0031] Further solutions, such as Figure 4 As shown, the spline shaft 201 and the spline sleeve's facing circumferential surfaces are axially limited by a stop structure, thereby leaving a gap between the spline shaft 201 and the pressure plate 302 .

[0032] The preferred solution is to continue to refer to Figure 4 As shown, a chamfered male stop 202 is provided at the root area of ​​the spline shaft 201 , and a chamfered female stop 103 is provided on the spline shaft sleeve for use with the male stop 202 .

[0033] In a further solution, a gap of 2mm-5mm is left between the pressure plate 302 and the spline shaft 201. This gap can ensure that the pre-tightening force of the connecting bolt 301 is sufficient, thereby tightening the transmission shaft 1 and the working device 2 axially to achieve an anti-loosening effect.

[0034] Further solutions, such as Figure 3 、 Figure 4 As shown, the output flange 102 is configured as a stepped hole at the axial end portion of the central hole facing the transmission shaft flange 101 , and the pressure plate 302 is arranged in the stepped hole.

[0035] Further solutions, such as Figure 2 、 Figure 3As shown, the outer edge area of ​​the transmission shaft flange 101 is provided with a circle of evenly spaced mounting holes I along the circumferential direction, and the output flange 102 is provided with a plurality of mounting holes II that are coaxially corresponding to the mounting holes I. Fasteners are used in conjunction with the coaxially arranged mounting holes I and mounting holes II to fix the transmission shaft flange 101 and the output flange 102 together.

[0036] The preferred solution is to continue to refer to Figure 2 、 Figure 3 As shown, the fasteners are bolts 4 and nuts 5. The bolts 4 are passed through the mounting holes I and II. The nuts 5 are tightened on the bolts 4 to press the transmission shaft flange 101 and the output flange 102 together.

[0037] Continue to refer to Figure 2 、 Figure 3 、 Figure 4 As shown, during the installation process, the transmission shaft flange 101 on the transmission shaft 1 and the output flange 102 with a spline sleeve are generally connected in advance by bolts 4 and nuts 5. The connecting bolts 301 and the pressure plate 302 in the axial locking structure 3 are generally separate parts and are not assembled. Therefore, it is necessary to loosen the bolts 4 and nuts 5 in advance to separate the transmission shaft flange 101 and the output flange 102 with a spline sleeve. Further, the spline shaft 201 on the working device 2 is connected to the output flange 102 with a spline sleeve. It is worth noting that the chamfered convex stop at the root area of ​​the spline shaft 2 cooperates with the chamfered concave stop on the output flange 102 with the spline sleeve, forming a spline sleeve as shown in FIG. Figure 4 The gap between the pressure plate 302 and the spline shaft 2 is designed to be within a range of 2mm-5mm through the design of the stop structure. This ensures sufficient preload force when the connecting bolts 301 are screwed into the threaded holes on the spline shaft 2, achieving a good radial connection and preventing loosening. After the pressure plate 302 is placed on the circumferential step of the output flange 102 with the spline sleeve, the connecting bolts 301 are screwed into the spline shaft 2. Finally, the drive shaft flange 101 on the drive shaft 1 is connected to the output flange 102 with the spline sleeve, and the bolts 4 and nuts 5 are tightened around the perimeter to form the final connection.

[0038] In summary, the utility model provides a loose connection structure between a transmission shaft and a working device, which fixes the transmission shaft and the working device axially through an axial locking structure, and a gap is left between the pressure plate in the axial locking structure and the spline shaft on the working device, which can ensure that the preload force on the connecting bolt is sufficient, and ensure that the spline sleeve of the transmission shaft is tightly connected to the spline shaft on the working device, and no axial slippage occurs, causing the spline shaft to move; the utility model can avoid the failure of the transmission shaft and the spline shaft falling off through the above technical scheme, reduce the failure rate, and improve the stability and reliability of the power transmission process.

[0039] The engineering vehicle provided by the present invention is described below. The engineering vehicle described below and the connection structure between the transmission shaft and the working device described above can be referred to in correspondence with each other.

[0040] The utility model provides an engineering vehicle, which may include the connection structure between the transmission shaft and the working device as described in any one of the above embodiments.

[0041] The beneficial effects achieved by the engineering vehicle provided by the present invention are consistent with the beneficial effects achieved by the connection structure between the transmission shaft and the working device provided by the present invention, and will not be described in detail here.

[0042] It should be noted that the above-mentioned engineering vehicle may be an articulated dump truck.

[0043] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0044] Furthermore, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are also intended to fall within the scope of protection of the present invention and form different embodiments. For example, in the above embodiments, those skilled in the art will be able to use them in combination based on the known technical solutions and the technical problems to be solved by this application.

[0045] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A connection structure between a transmission shaft and a working device, characterized in that: include: The transmission shaft flange arranged at the rear end of the transmission shaft and the output flange with the spline sleeve are assembled together by fasteners; A spline shaft arranged on the working device is inserted into the spline sleeve of the output flange, and the two are engaged through a spline structure, so that the transmission shaft can rotate circumferentially along with the spline shaft; The axial locking structure used to fix the output flange and the spline shaft together includes: a pressure plate with a center hole, arranged coaxially with the spline sleeve on the axial end face of the output flange; The connecting bolt passes through the center hole of the pressure plate and is tightened into the center threaded hole on the axial end face of the spline shaft, so that the pressure plate is tightly attached to the output flange; a gap is left between the pressure plate and the spline shaft to ensure that the connecting bolt has sufficient pre-tightening force.

2. The connection structure between a transmission shaft and a working device according to claim 1, characterized in that: The facing circumferential surfaces of the spline shaft and the spline sleeve are axially limited by a stop structure, thereby leaving the gap between the spline shaft and the pressure plate.

3. The connection structure between a transmission shaft and a working device according to claim 2, characterized in that: The root area of ​​the spline shaft is provided with a chamfered convex stop, and the spline shaft sleeve is provided with a chamfered concave stop used in conjunction with the convex stop.

4. The connection structure between a transmission shaft and a working device according to claim 1, characterized in that: The output flange is provided with a stepped hole at an axial end portion of the central hole facing the transmission shaft flange, and the pressure plate is arranged in the stepped hole.

5. The connection structure between a transmission shaft and a working device according to claim 1, characterized in that: The outer edge area of ​​the transmission shaft flange is provided with a circle of evenly spaced mounting holes I along the circumference, and the output flange is provided with a plurality of mounting holes II which are coaxially corresponding to the mounting holes I. The fastener is used in conjunction with the coaxially arranged mounting holes I and mounting holes II to fix the transmission shaft flange and the output flange together.

6. The connection structure between a transmission shaft and a working device according to claim 5, characterized in that: The fasteners are bolts and nuts. The bolts are inserted into the mounting holes I and II. The nuts are screwed onto the bolts to press the transmission shaft flange and the output flange together.

7. The connection structure between a transmission shaft and a working device according to claim 1, characterized in that: A gap of 2mm-5mm is left between the pressure plate and the spline shaft.

8. An engineering vehicle, characterized in that: The connecting structure between the transmission shaft and the working device comprises the connection structure between the transmission shaft and the working device according to any one of claims 1 to 7.

9. The engineering vehicle according to claim 8, characterized in that: The engineering vehicle is an articulated dump truck, wherein the working device is a hydraulic pump mechanism.

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