A dual-power switching mechanism, transfer case and engineering machinery

Abstract

This utility model discloses a dual-power switching mechanism, a transfer case, and engineering machinery, including a cylinder, a piston sleeve, a meshing sleeve, and a bearing. The cylinder has a hollow structure with at least one air inlet on its annular circumferential surface. The piston sleeve is arranged in the cylinder and can move axially within it. The meshing sleeve is embedded in the piston sleeve. The bearing is arranged between the opposing circumferential surfaces of the piston sleeve and the meshing sleeve. The meshing sleeve can rotate circumferentially within the piston sleeve but cannot move axially. Two rotating shafts are inserted through two coaxially arranged openings in the cylinder. After air is introduced through the air inlets, the piston sleeve drives the meshing sleeve to reciprocate within the cylinder, disengaging and connecting the two rotating shafts at their joints, thereby achieving power transmission between the two shafts. This utility model's power switching mechanism utilizes the principle of reciprocating piston movement within the cylinder, and features two air inlets for gear shifting, making operation convenient and smooth.

Description

Technical Field

[0001] This utility model relates to a dual-power switching mechanism for a transfer case, belonging to the field of engineering machinery technology. Background Technology

[0002] Well workover rigs, widely used in oilfield and mining machinery, require high continuity of operation due to the specific technological requirements of their applications. If workover operations are suddenly interrupted due to engine failure or improper switching between dual power sources, the quality and process of the workover will be severely affected. The transfer case, as the power distribution mechanism of the entire machine, is responsible for transmitting the input power to the hydraulic torque converter, hydraulic pump, and hydraulic torque converter pump.

[0003] Currently, most dual-drive workover rigs have a transfer case structure consisting of three drive shafts, with keyed connections between the three shafts and gears. The motor input shaft, engine input shaft, and intermediate shaft are driven by internal large gears. The power switching device typically uses an electromagnetic clutch to connect the motor input shaft and the motor shaft. Some also use a shift fork to achieve power shifting, thus achieving dual power switching. This ensures that the motor can provide uninterrupted power when the engine fails, guaranteeing the continuity of workover operations. However, electromagnetic clutches have high maintenance and repair costs, and the disassembly process is cumbersome and costly. The shift fork mechanism requires high dimensional accuracy, and the transfer case shifting is easily affected by component deformation or errors, resulting in poor shifting smoothness. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a dual-power switching mechanism, particularly a dual-power switching mechanism suitable for the transfer case of a well workover rig. The mechanism achieves power switching through the reciprocating motion of a cylinder and piston. Simultaneously, the engagement sleeve and piston sleeve are connected by a needle roller bearing, and the engagement sleeve has evenly distributed oil holes for forced lubrication, preventing wear, overheating, and sintering of the two components, thus improving component lifespan. This effectively solves the problems of inconvenient shifting operation and cumbersome maintenance in the transfer case, reducing maintenance and upkeep costs.

[0005] This utility model is achieved according to the following technical solution:

[0006] Firstly, this utility model provides a dual-power switching mechanism, mainly used in transfer cases, comprising:

[0007] The cylinder block is a hollow structure, with at least one air inlet on its annular circumferential surface;

[0008] A piston sleeve is arranged in the cylinder and is capable of axial movement within the cylinder.

[0009] The engagement sleeve is embedded in the piston sleeve;

[0010] A bearing is arranged between the opposing circumferential surfaces of the piston sleeve and the engagement sleeve, wherein the engagement sleeve is capable of circumferential rotation in the piston sleeve but cannot move axially.

[0011] In this configuration, a rotating shaft is inserted into each of the two coaxially arranged openings in the cylinder body. After the air inlet is vented, the piston sleeve drives the meshing sleeve to reciprocate within the cylinder body, thereby disengaging and connecting the two rotating shafts at their joints, thus enabling power transmission between the two rotating shafts.

[0012] In some embodiments, the inner circumferential surface of the engagement sleeve is provided with an internal spline, and the outer circumferential surface of the mating area of ​​the two rotating shafts is provided with an external spline; when the engagement sleeve engages with only one of the rotating shafts, the mating point of the two rotating shafts is in a disengaged state, and there is no power transmission between them; when the engagement sleeve engages with both rotating shafts at the same time, the mating point of the two rotating shafts is in a connected state, and there is power transmission between them.

[0013] In some embodiments, the upper region of the outer circumferential surface of the piston sleeve is provided with a groove extending along its entire circumference, and a retaining ring is provided in the groove. The retaining ring contacts a step on the inner circumferential surface of the piston sleeve to limit the downward axial movement of the engagement sleeve. The bearing is arranged between the step on the inner circumferential surface of the piston sleeve and the step on the outer circumferential surface of the engagement sleeve to limit the upward axial movement of the engagement sleeve.

[0014] In some embodiments, a piston cover is installed on the top surface of the piston sleeve, and the piston cover can abut against a step on the inner circumferential surface of the cylinder to limit the downward axial movement of the piston sleeve; when the piston cover contacts the step on the inner circumferential surface of the cylinder, the upper half of the engagement sleeve engages with the upper rotating shaft, and the lower half of the engagement sleeve engages with the lower rotating shaft.

[0015] In some embodiments, at least one O-ring is installed between the piston cap and the opposing circumferential surfaces of the cylinder; and / or,

[0016] At least one O-ring is installed between the axial faces of the piston cap and the piston sleeve; and / or,

[0017] At least one O-ring is installed between the piston sleeve and the circumferential surface of the cylinder body facing each other.

[0018] In some embodiments, the top surface of the piston sleeve is provided with a plurality of evenly spaced threaded holes along its entire circumference, and the piston cover is provided with a plurality of through holes corresponding one-to-one with the threaded holes, and the piston cover is fixed to the piston sleeve by screws arranged around the circumference.

[0019] In some embodiments, the cylinder body is provided with a plurality of oil pipe ports, and the meshing sleeve and the rotating shaft are provided with oil holes. The oil pipe ports and oil holes together form a lubrication channel for providing lubricating oil to the bearing.

[0020] Secondly, this utility model provides a transfer case, including the aforementioned dual power switching mechanism; one of the rotating shafts is a motor input shaft, and the other rotating shaft is a power take-off output shaft; when the engagement sleeve engages only with the motor input shaft, the engine provides operating power to the whole machine; when the engagement sleeve engages with both the motor input shaft and the power take-off output shaft simultaneously, the motor provides operating power to the whole machine.

[0021] In some embodiments, at the junction of the motor input shaft and the power take-off output shaft, one shaft is provided with a groove and the other shaft is provided with a boss. The boss is inserted into the groove, and a bearing is installed between the opposing circumferential surfaces of the boss and the groove, so that the two can rotate circumferentially.

[0022] Thirdly, this utility model provides an engineering machinery, including the aforementioned dual-power switching mechanism; or, including the aforementioned transfer case.

[0023] The beneficial effects of this utility model are:

[0024] Compared to shifting mechanisms such as electromagnetic clutches and shift forks, this utility model's power switching mechanism utilizes the principle of piston reciprocating motion within a cylinder, featuring two air inlets for shifting operations. This makes operation convenient and ensures smooth shifting. Furthermore, it employs a meshing sleeve to connect the front and rear shafts, resulting in a simple structure that facilitates installation and disassembly, reducing maintenance costs. A needle roller bearing is added between the two relatively moving parts to prevent wear and sintering between the inner and outer components, thus extending their service life. Additionally, the meshing sleeve incorporates an oblique hole to provide forced lubrication for the needle roller bearing, further enhancing the smoothness of power switching. Attached Figure Description

[0025] 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.

[0026] In the attached diagram:

[0027] Figure 1 This is a cross-sectional view of the dual-power switching mechanism of this utility model;

[0028] Figure 2 for Figure 1 Partial schematic diagram;

[0029] Figure 3 This is a schematic diagram of the assembly of the dual-power switching mechanism of this utility model with the input shaft and output shaft. Figure 1 ;

[0030] Figure 4This is a schematic diagram of the assembly of the dual-power switching mechanism of this utility model with the input shaft and output shaft. Figure 2 .

[0031] Attached diagram labels: 1. Engaging sleeve; 2. Retaining ring; 3. Needle roller bearing; 4. Piston sleeve; 5. O-ring; 6. Screw; 7. Washer; 8. Piston cover; 9. O-ring; 10. Cylinder block; 11. Oil pipe port; 12. Air inlet I; 13. Air inlet II; 14. Needle roller bearing; 15. Motor input shaft; 16. Power take-off output shaft; 17.

[0032] 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

[0033] 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.

[0034] 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.

[0035] 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.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a dual-power switching mechanism, mainly used in a transfer case, includes a cylinder body 11, a piston sleeve 4, a meshing sleeve 1, and a needle roller bearing 3. The cylinder body 11 is a hollow structure with an air inlet I 13 and an air inlet II 14 on its annular circumferential surface. The piston sleeve 4 is arranged in the cylinder body 11 and can move axially within the cylinder body 11. The meshing sleeve 1 is embedded in the piston sleeve 4. The needle roller bearing 3 is arranged between the opposing circumferential surfaces of the piston sleeve 4 and the meshing sleeve 1. The meshing sleeve 1 can rotate circumferentially within the piston sleeve 4 but cannot move axially. A rotating shaft is inserted through each of the two coaxially arranged openings in the cylinder body 11. After air is introduced through the air inlet, the piston sleeve 4 drives the meshing sleeve 1 to reciprocate within the cylinder body 11, disengaging and connecting the two rotating shafts at their joints, thereby achieving power transmission between the two rotating shafts.

[0037] Further options, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the inner circumferential surface of the meshing sleeve 1 is provided with an internal spline, and the outer circumferential surface of the mating area of ​​the two rotating shafts is provided with an external spline. When the meshing sleeve 1 meshes with only one of the rotating shafts, the mating point of the two rotating shafts is in a disengaged state, and there is no power transmission between them. When the meshing sleeve 1 meshes with both rotating shafts at the same time, the mating point of the two rotating shafts is in a connected state, and there is power transmission between them.

[0038] Further options, such as Figure 1 , Figure 2 As shown, the upper region of the outer circumferential surface of the piston sleeve 4 is provided with a groove extending along its entire circumference. A retaining ring 2 is provided in the groove. The retaining ring 2 contacts the step on the inner circumferential surface of the piston sleeve 4 to limit the downward axial movement of the meshing sleeve 1. The needle roller bearing 3 is arranged between the step on the inner circumferential surface of the piston sleeve 4 and the step on the outer circumferential surface of the meshing sleeve 1 to limit the upward axial movement of the meshing sleeve 1.

[0039] Further options, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a piston cover 8 is installed on the top surface of the piston sleeve 4. The piston cover 8 can abut against the step on the inner circumferential surface of the cylinder body 11 to limit the downward axial movement of the piston sleeve 4. When the piston cover 8 contacts the step on the inner circumferential surface of the cylinder body 11, the upper half of the engagement sleeve 1 engages with the upper rotating shaft, and the lower half of the engagement sleeve 1 engages with the lower rotating shaft.

[0040] Further options, such as Figure 1 , Figure 2 As shown, at least one O-ring 10 is installed between the opposing circumferential surfaces of the piston cover 8 and the cylinder body 11.

[0041] Further options, such as Figure 1 , Figure 2 As shown, at least one O-ring 9 is installed between the axial faces of the piston cover 8 and the piston sleeve 4.

[0042] Further options, such as Figure 1 , Figure 2 As shown, at least one O-ring 5 is installed between the piston sleeve 4 and the opposing circumferential surfaces of the cylinder body 11.

[0043] Further options, such as Figure 1 , Figure 2 As shown, the top surface of the piston sleeve 4 has multiple evenly spaced threaded holes along its entire circumference, and the piston cover 8 has multiple through holes that correspond one-to-one with the threaded holes. The piston cover 8 is fixed to the piston sleeve 4 by screws 6 and washers 7 arranged around the circumference.

[0044] Further options, such as Figure 1 , Figure 2 As shown, the cylinder body 11 is provided with multiple oil pipe ports 12, and the meshing sleeve 1 and the rotating shaft are provided with oil holes. The oil pipe ports 12 and the oil holes together form a lubrication channel for providing lubricating oil to the needle roller bearing 3.

[0045] This utility model also provides a transfer case, mainly comprising a motor input shaft, an engine input shaft 1, and an intermediate shaft, which transmit power through a large gear connected by a key. The aforementioned dual-power switching mechanism is installed in the transfer case to switch between motor input and engine input power sources. In the meshing sleeve 1, one shaft is the motor input shaft 16, and the other is the power take-off output shaft 17. When the meshing sleeve 1 meshes only with the motor input shaft 16, the engine provides power to the entire machine; when the meshing sleeve 1 meshes with both the motor input shaft 16 and the power take-off output shaft 17, the motor provides power to the entire machine.

[0046] In a further embodiment, at the joint between the motor input shaft 16 and the power take-off output shaft 17, one shaft has a groove, and the other shaft has a boss. The boss inserts into the groove, and a needle roller bearing 15 is installed between the opposing circumferential surfaces of the boss and the groove, allowing circumferential rotation between the two. Furthermore, lubricating oil is provided to the needle roller bearing 15 through a lubrication channel formed by the oil pipe port 12 and the oil hole.

[0047] The following describes the power transmission process of the aforementioned dual-power switching mechanism in the transfer case.

[0048] Process 1, such as Figure 3As shown, when air intake port I13 is open, the dual power switching mechanism is disengaged. At this time, the meshing sleeve 1 only meshes with the motor input shaft 16, and there is no power transmission between the power take-off output shaft 17 and the motor input shaft 16. At this time, the whole machine is powered by the engine. The engine input shaft transmits power to the power take-off output shaft 17 through the large gear connected by the key on it and the intermediate shaft gear. A needle roller bearing 15 is set between the power take-off output shaft 17 and the motor input shaft 16 to prevent wear of the components due to relative rotation or unnecessary stress damage due to axial eccentricity. At the same time, two evenly distributed oil holes are provided on the motor input shaft 16 to transmit the lubricating oil introduced by the upper oil pipe port 12 to the needle roller bearing 15 to provide forced lubrication.

[0049] Process 2, such as Figure 4 As shown, when air is supplied through the air inlet II14, the dual power switching mechanism is engaged. The engagement sleeve 1 engages with the motor input shaft 16 and the power take-off output shaft 17 simultaneously. The motor input power is transmitted to the motor input shaft 16 through the flange, and the motor input shaft 16 transmits the power to the power take-off output shaft 17 through the engagement sleeve 1. At this time, the entire machine is powered by the motor. A needle roller bearing 3 is placed between the engagement sleeve 1 and the piston sleeve 4. The oil holes evenly distributed on the engagement sleeve 1 provide forced lubrication for the needle roller bearing 3, preventing overheating and sintering between the engagement sleeve 1 and the piston sleeve 4.

[0050] As can be seen from the above, the aforementioned dual-power switching mechanism, by supplying air to intake port I and intake port II, causes the dual-power switching mechanism to reciprocate within the cylinder, thereby disengaging and engaging the motor end and the power take-off end. This, to a certain extent, avoids occasional problems such as poor power switching of the electromagnetic clutch, as well as problems such as shifting jamming and incomplete shifting caused by deformation of the shift fork mechanism. Simultaneously, the two opposing rotating parts of this dual-power switching mechanism are connected by needle roller bearings and equipped with oil holes for forced lubrication, preventing problems such as component jamming, wear, and overheating sintering caused by machining errors.

[0051] In summary, this utility model provides a dual-power switching mechanism, mainly applied to engineering machinery such as well workover rigs. Its key feature is the addition of a needle roller bearing between the engagement sleeve and the piston sleeve, improving the smoothness of power switching. Compared to a loose-fit structure between the engagement sleeve and piston sleeve, it reduces the risk of coaxiality errors caused by machining mistakes or surface wear, overheating, and sintering due to excessive tightness. Simultaneously, this structure facilitates disassembly and installation; aging wear due to usage time only requires replacement of the needle roller bearing, reducing maintenance costs. Furthermore, the evenly distributed oil holes on the engagement sleeve provide forced lubrication for the needle roller bearing, ensuring stable power switching. This utility model, to a certain extent, solves the problem of well workover rig operations being affected by engine failure or improper dual-power switching in the transfer case. By switching between motor power and engine power through this mechanism, the continuity of well workover operations is ensured, thereby guaranteeing the quality of well workover.

[0052] The engineering machinery provided by this utility model is described below. The engineering machinery described below can be referred to in correspondence with the transfer case described above.

[0053] The engineering machinery provided by this utility model may include a transfer case as described in any of the above embodiments.

[0054] The beneficial effects achieved by the engineering machinery provided by this utility model are consistent with the beneficial effects achieved by the transfer case provided by this utility model, so they will not be repeated here.

[0055] It should be noted that the aforementioned engineering machinery can be well servicing machines.

[0056] 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.

[0057] 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.

[0058] 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 dual power shift mechanism, mainly applied in a transfer case, characterized in that, include: The cylinder block is a hollow structure, with at least one air inlet on its annular circumferential surface; A piston sleeve is arranged in the cylinder and is capable of axial movement within the cylinder. The engagement sleeve is embedded in the piston sleeve; A bearing is arranged between the opposing circumferential surfaces of the piston sleeve and the engagement sleeve, wherein the engagement sleeve is capable of circumferential rotation in the piston sleeve but cannot move axially. In this configuration, a rotating shaft is inserted into each of the two coaxially arranged openings in the cylinder body. After the air inlet is vented, the piston sleeve drives the meshing sleeve to reciprocate within the cylinder body, thereby disengaging and connecting the two rotating shafts at their joints, thus enabling power transmission between the two rotating shafts.

2. The dual-power switching mechanism according to claim 1, characterized in that: The inner circumferential surface of the engagement sleeve is provided with an internal spline, and the outer circumferential surface of the mating area of ​​the two rotating shafts is provided with an external spline. When the engagement sleeve engages with only one of the rotating shafts, the mating point of the two rotating shafts is in a disengaged state, and there is no power transmission between them. When the engagement sleeve engages with both rotating shafts at the same time, the mating point of the two rotating shafts is in a connected state, and there is power transmission between them.

3. The dual-power switching mechanism according to claim 1, characterized in that: The upper region of the outer circumferential surface of the piston sleeve is provided with a groove extending along its entire circumference. A retaining ring is provided in the groove. The retaining ring contacts the step on the inner circumferential surface of the piston sleeve to limit the downward axial movement of the engagement sleeve. The bearing is arranged between the step on the inner circumferential surface of the piston sleeve and the step on the outer circumferential surface of the engagement sleeve, thereby limiting the upward axial movement of the engagement sleeve.

4. The dual-power switching mechanism according to claim 1, characterized in that: A piston cover is installed on the top surface of the piston sleeve. The piston cover can abut against the step on the inner circumferential surface of the cylinder body to limit the downward axial movement of the piston sleeve. When the piston cover contacts the step on the inner circumferential surface of the cylinder, the upper half of the engagement sleeve engages with the upper rotating shaft, and the lower half of the engagement sleeve engages with the lower rotating shaft.

5. The dual-power switching mechanism according to claim 4, characterized in that: At least one O-ring is installed between the piston cap and the opposing circumferential surfaces of the cylinder; and / or, At least one O-ring is installed between the axial faces of the piston cap and the piston sleeve; and / or, At least one O-ring is installed between the piston sleeve and the circumferential surface of the cylinder body facing each other.

6. The dual-power switching mechanism according to claim 4, characterized in that: The top surface of the piston sleeve has multiple evenly spaced threaded holes along its entire circumference, and the piston cover has multiple through holes that correspond one-to-one with the threaded holes. The piston cover is fixed to the piston sleeve by screws arranged around the circumference.

7. The dual-power switching mechanism according to claim 1, characterized in that: The cylinder body is provided with multiple oil pipe ports, and the meshing sleeve and the rotating shaft are provided with oil holes. The oil pipe ports and oil holes together form a lubrication channel for providing lubricating oil to the bearing.

8. A transfer case, characterized in that: Includes the dual-power switching mechanism as described in any one of claims 1 to 7; wherein one rotating shaft is a motor input shaft and the other rotating shaft is a power take-off output shaft; When the engagement sleeve engages only with the motor input shaft, the engine provides operating power to the entire machine; when the engagement sleeve engages with both the motor input shaft and the power take-off output shaft simultaneously, the motor provides operating power to the entire machine.

9. A transfer case according to claim 8, characterized in that: At the junction of the motor input shaft and the power take-off output shaft, one shaft is provided with a groove and the other shaft is provided with a boss. The boss is inserted into the groove, and a bearing is installed between the circumferential surfaces of the boss and the groove facing each other, so that the two can rotate circumferentially.

10. An engineering machinery, characterized in that: It includes the dual-power switching mechanism as described in any one of claims 1 to 7; or, it includes the transfer case as described in claim 8 or 9.

Images