Plunger motor with speed reducing mechanism

Abstract

The utility model discloses a plunger motor with a speed reducing mechanism, which comprises a plunger motor body and a speed reducer, the plunger motor body is provided with a main shaft connected with the speed reducer, the main shaft is provided with a first tapered roller bearing and a second tapered roller bearing in parallel, one end of the main shaft is provided with a shaft shoulder, and the inner ring end face of the first tapered roller bearing is attached to the shaft shoulder. A bearing pressing ring is arranged on the end face of the outer ring; the outer ring end face of the second tapered roller bearing is attached to the bearing pressing ring, and a bearing check ring is arranged on the main shaft and attached to the inner ring end face of the second tapered roller bearing. According to the plunger motor with the speed reducing mechanism, the thrust applied to the main shaft by the plunger is overcome by adopting a double-bearing structure, the axial bearing capacity is larger, and the plunger motor is resistant to high pressure; the number of bearings is smaller than that of a conventional plunger motor, the failure rate is low, the machining position of the bearing position of the shell is shortened, the length of the shell is shortened, the length of the whole machine is shortened, the manufacturing and assembling cost is lower, and the service life is longer.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration equipment technology, specifically a piston motor with a reduction mechanism. Background Technology

[0002] In geological exploration, the plunger motor is a crucial component of the drilling rig. It transmits power via a hydraulic system, driving the power head to rotate in both directions to obtain subsurface rock core samples for geological analysis and research. During operation, the plunger motor's displacement handle adjusts the power head's speed and torque to drive the drilling process. However, relying solely on the plunger motor's displacement handle adjustment cannot achieve the desired torque during drilling. Therefore, a cycloidal motor with higher torque is required. The complex working conditions during drilling necessitate frequent motor replacements, placing a significant workload on the workers.

[0003] To address the issue of increasing torque, several technical solutions have been proposed. For example, one solution involves adding a coaxial or side-mounted speed reducer between the piston motor and the power head to increase torque and reduce the frequency of motor replacements. These solutions can alleviate the workload of workers to some extent, but some problems still remain.

[0004] In the existing technology, piston motors are generally swashplate piston motors. The displacement of the motor is adjusted by the angle between the piston and the output shaft. When the motor is running, the piston will apply a large thrust to the main shaft, while the motor output shaft is used as a reducer gear and will not generate tension. Conventional piston motors generally use a pair (two) angular contact bearings and a deep groove ball bearing to counteract this thrust. The inner ring of the bearing needs to be preloaded with a disc spring, and the outer ring of the bearing needs to be adjusted by adjusting shims. The structure is complex and has high requirements for machining and assembly.

[0005] Therefore, the aforementioned technical problems need to be solved. Summary of the Invention

[0006] This utility model addresses the above-mentioned technical problems by providing a piston motor with a reduction mechanism. It adopts a double-bearing structure to overcome the thrust exerted by the piston on the main shaft, resulting in greater axial load capacity and high pressure resistance. Moreover, the number of bearings is more streamlined than that of conventional piston motors, leading to a lower failure rate. The machining position of the housing bearing position is shortened, the housing length is shortened, the overall length of the machine is shortened, the manufacturing and assembly costs are lower, and the service life is longer.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows:

[0008] A piston motor with a reduction mechanism includes a piston motor body and a reducer. The piston motor body is provided with a main shaft connected to the reducer. A first tapered roller bearing and a second tapered roller bearing are arranged side by side on the main shaft. One end of the main shaft is provided with a shoulder. The inner ring end face of the first tapered roller bearing is attached to the shoulder, and a bearing retainer ring is provided on its outer ring end face. The outer ring end face of the second tapered roller bearing is attached to the bearing retainer ring. A bearing retainer ring is provided on the main shaft and is attached to the inner ring end face of the second tapered roller bearing.

[0009] This piston motor with a reduction mechanism uses a double bearing structure with a first tapered roller bearing and a second tapered roller bearing to overcome the thrust exerted by the piston on the main shaft, resulting in greater axial load capacity and high pressure resistance. Moreover, the number of bearings is more streamlined than that of conventional piston motors, leading to a lower failure rate. The machining position of the housing bearing position is shortened, the housing length is shortened, the overall length of the machine is shortened, the manufacturing and assembly costs are lower, and the service life is longer.

[0010] To further optimize the design, an adjusting shim is provided between the bearing retaining ring on the main shaft and the second tapered roller bearing. Adjusting the shim adjusts the clearance, resulting in tighter contact between the mating surfaces, smoother spindle operation, and improved overall system stability.

[0011] A further optimized design includes a one-piece molded motor housing, within which the plunger motor body is housed. This one-piece molded motor housing offers a more compact structure, easier installation, and better strength.

[0012] In a further optimized design, the outer cylindrical surfaces of the first and second tapered roller bearings respectively mate with the inner bore surface of the motor housing, and one end face of the bearing retaining ring is fitted against the inner bore end face of the motor housing. During operation, when the plunger generates thrust on the main shaft, the thrust is first applied to the bearing retaining ring through the first tapered roller bearing, and then to the motor housing through the bearing retaining ring, thus overcoming the thrust exerted by the plunger on the main shaft.

[0013] In a further optimized design, the main shaft is equipped with meshing teeth that engage with the gears of the reducer. The meshing teeth directly on the main shaft replace the traditional shaft and gear structure, resulting in a simpler structure and easier installation.

[0014] In a further optimized design, a cylinder is provided at the shoulder end of the spindle, and a plunger assembly is provided inside the cylinder to connect to the spindle.

[0015] This utility model has the following technical advantages compared with the prior art:

[0016] 1. Improved stability: The piston motor with reduction mechanism of the present invention adopts a double tapered roller bearing structure. The thrust generated during operation is applied to the housing through the tapered roller bearing. The overall structure is simpler, the failure rate is lower, and the stability of the motor is improved. The processing technology and assembly technology have also been greatly improved.

[0017] 2. Extended service life: The dual-bearing structure of the piston motor with reduction mechanism of this invention has a more reasonable stress distribution, greater axial load capacity, and high pressure resistance; moreover, the bearing failure rate is low, thus extending the overall service life.

[0018] 3. Reduced costs: The piston motor with reduction mechanism of the present invention adopts a double bearing structure. This structural design not only reduces manufacturing and assembly costs, but also facilitates maintenance and replacement of parts, further improving the economy of use. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of a specific embodiment of a piston motor with a reduction mechanism according to this utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view of the piston motor body;

[0021] Figure 3 yes Figure 1 A three-dimensional image;

[0022] Figure 4 yes Figure 1 A 3D view showing the connection between the spindle and the plunger assembly.

[0023] In the figure: 1. First tapered roller bearing; 2. Second tapered roller bearing; 3. Main shaft; 3a. Shaft shoulder; 3b. Meshing teeth; 4. Bearing retaining ring; 5. Adjusting shim; 6. Motor housing; 7. Cylinder body; 8. Piston assembly; 9. Reducer; 10. Piston motor body; 11. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0025] like Figures 1 to 4 As shown, this utility model provides a specific embodiment of a piston motor with a reduction mechanism.

[0026] like Figure 1 and Figure 2As shown, this embodiment of a piston motor with a reduction mechanism includes a piston motor body 11 and a reducer 10. The piston motor body 11 is provided with a main shaft 3 connected to the reducer 10. A first tapered roller bearing 1 and a second tapered roller bearing 2 are arranged side by side on the main shaft 3. One end of the main shaft 3 is provided with a shoulder 3a. The inner ring end face of the first tapered roller bearing 1 is attached to the shoulder 3a, and a bearing retainer ring 4 is provided on its outer ring end face. The outer ring end face of the second tapered roller bearing 2 is attached to the bearing retainer ring 4. A bearing retainer ring 5 is provided on the main shaft 3 and is attached to the inner ring end face of the second tapered roller bearing 2.

[0027] This piston motor with a reduction mechanism uses a double bearing structure of a first tapered roller bearing 1 and a second tapered roller bearing 2 to overcome the thrust exerted by the piston on the main shaft 3, resulting in greater axial load capacity and high pressure resistance. Moreover, the number of bearings is more streamlined than that of conventional piston motors, leading to a lower failure rate. The machining position of the housing bearing position is shortened, the housing length is shortened, the overall length of the machine is shortened, the manufacturing and assembly costs are lower, and the service life is longer.

[0028] like Figure 1 and Figure 2 As shown, an adjusting shim 6 is provided between the bearing retaining ring 5 on the main spindle 3 and the second tapered roller bearing 2. The gap is adjusted by adjusting the shim 6, making the contact surfaces tighter, the main spindle 3 runs more smoothly, and the overall system stability is better.

[0029] like Figure 1 and Figure 3 As shown, the piston motor with a reduction mechanism also includes an integrally molded motor housing 7, and the piston motor body 11 is disposed inside the motor housing 7. The integrally molded motor housing 7 has a more compact structure, is easier to install, and has better strength.

[0030] like Figure 1 and Figure 2 As shown, the outer cylindrical surfaces of the first tapered roller bearing 1 and the second tapered roller bearing 2 respectively mate with the inner bore surface of the motor housing 7, and one end face of the bearing retaining ring 4 is in contact with the inner bore end face of the motor housing 7. During operation, when the plunger generates thrust on the main shaft 3, the thrust will first act on the bearing retaining ring 4 through the first tapered roller bearing 1, and then act on the motor housing 7 through the bearing retaining ring 4, thus overcoming the thrust exerted by the plunger on the main shaft 3.

[0031] like Figure 1 and Figure 4 As shown, the main shaft 3 has meshing teeth 3b that mesh with the gears of the reducer 10. The main shaft 3 directly has meshing teeth 3b, replacing the traditional shaft and gear structure, resulting in a simpler structure and easier installation. Figure 1 As shown, a cylinder 8 is provided at the shoulder 3a end of the spindle 3, and a plunger assembly 9 is provided inside the cylinder 8 to connect the spindle 3.

[0032] Compared with the prior art, the plunger motor with reduction mechanism of this utility model adopts a double bearing structure to overcome the thrust exerted by the plunger on the main shaft, resulting in greater axial load capacity and high pressure resistance. It is not only simple in structure, stable, and low in cost, but also has a long service life and a more reasonable and practical structure.

[0033] In summary, as described in the specification and figures, this utility model has been manufactured into actual samples and subjected to multiple use tests. The test results demonstrate that this utility model achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of this utility model. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this utility model, without departing from the scope of the technical features and similar features disclosed in this utility model, are all within the protection scope of this utility model.

Claims

1. A plunger motor with a reduction mechanism, comprising a plunger motor body (11) and a reduction mechanism (10), the plunger motor body (11) being provided with a main shaft (3) connected to the reduction mechanism (10), characterized in that: The main shaft (3) is provided with the first tapered roller bearing (1) and the second tapered roller bearing (2) side by side, one end of the main shaft (3) is provided with a shaft shoulder (3a), the inner ring end face of the first tapered roller bearing (1) is attached to the shaft shoulder (3a), and the outer ring end face is provided with a bearing pressing ring (4); the outer ring end face of the second tapered roller bearing (2) is attached to the bearing pressing ring (4), and the main shaft (3) is provided with a bearing stop ring (5) attached to the inner ring end face of the second tapered roller bearing (2); The bearing stop ring (5) on the main shaft (3) is provided between the bearing stop ring (5) and the second tapered roller bearing (2).

2. The reduced mechanism plunger motor of claim 1 wherein, Further comprising a one-piece motor housing (7), the plunger motor body (11) is arranged in the motor housing (7).

3. The reduced mechanism plunger motor of claim 2 wherein, The outer ring cylindrical surface of the first tapered roller bearing (1) and the second tapered roller bearing (2) is matched with the inner hole surface of the motor housing (7) respectively, and one end surface of the bearing pressing ring (4) is attached to the inner hole end surface of the motor housing (7).

4. The reduced mechanism plunger motor of claim 1 wherein, The main shaft (3) is provided with meshing teeth (3b) engaged with the gear of the speed reducer (10).

5. The reduced mechanism plunger motor of claim 1 wherein, The shaft shoulder (3a) end of the main shaft (3) is provided with a cylinder (8), and the cylinder (8) is provided with a plunger assembly (9) connected to the main shaft (3).

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