Planetary reducer with speed measurement function

Abstract

The utility model discloses a planetary reducer with speed measurement function, including the casing and the spline shaft of setting in the casing inside, bearing is installed between casing one end end portion and spline shaft, and the other end is provided with speed measurement gear and speed sensor, the speed measurement gear is installed on the casing, the speed measurement gear is installed in the spline shaft circumference, and the clearance is set between speed measurement gear and speed sensor, to satisfy the speed measurement requirement, spline shaft outer edge is provided with limit slot no.

Description

Technical Field

[0001] This utility model relates to the field of planetary gear reducers, specifically to a planetary gear reducer with speed measurement function. Background Technology

[0002] Currently, planetary gearboxes used in the construction machinery industry do not have speed measurement capabilities; the planetary gearbox is connected to the motor via an input component. Ordinary input components do not have speed measurement functionality, therefore planetary gearboxes cannot measure speed either. For example... Figure 1 As shown, a typical input assembly mainly consists of an oil seal (1), a housing (2), a bearing (3), and a splined shaft (4). In the input assembly, the housing (2) is connected to the motor at one end and to the reducer at the other end, serving as a support. The splined shaft (4) is connected to the motor output shaft at one end and to the reducer input gear at the other end, thereby transmitting the motor torque to the reducer, allowing the assembly to operate normally.

[0003] In a few scenarios where speed measurement is required, a hydraulic motor paired with a speed sensor is used to achieve this function. However, the selection of hydraulic motors with built-in speed measurement capabilities is limited, and they are relatively expensive.

[0004] CN202222382733.9 discloses a gear reducer speed testing device including a test platform. A gear reducer is mounted on the upper surface of the test platform. A speed measuring instrument is connected to the upper surface of the test platform away from the gear reducer via a limiting component. A rotating shaft is inserted between the output end of the gear reducer and the detection end of the speed measuring instrument. Two opposing friction sleeves are fitted onto the outer surface of the rotating shaft. By setting the rotating shaft to cooperate with the friction sleeves during testing, the speed of the gear reducer can be obtained under both unobstructed and obstructed conditions, facilitating result comparison and enhancing the experimental nature. However, this structure requires a large space for testing and is suitable for experimental testing purposes, but it cannot measure speed in real time during use.

[0005] Therefore, designing a planetary reducer input component with speed measurement function, which can be matched with various planetary reducers and hydraulic motors, such as piston motors and cycloidal motors, has practical significance and real value. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by disclosing a planetary reducer with speed measurement functionality. To achieve this function, a newly designed input component is employed, optimizing the original structure and adding components such as a sensor and speed-measuring gear to meet speed measurement requirements. This newly designed input component can be applied to various scenarios requiring speed measurement, and its variable interface allows for compatibility with different hydraulic motors and planetary reducers. This structure has wide applicability, a relatively simple overall design, no oil contamination at the sensor location, and reliable quality.

[0007] The technical means adopted by this utility model to solve the above problems are as follows:

[0008] A planetary reducer with speed measurement function is disclosed, including a housing and a splined shaft disposed inside the housing; a bearing is installed between one end of the housing and the splined shaft, and a speed measuring gear and a speed sensor are disposed at the other end. The speed measuring gear is mounted on the housing and is installed circumferentially on the splined shaft. The speed measuring gear and the speed sensor are spaced apart to meet the speed measurement requirements; a limiting groove is provided on the outer edge of the splined shaft for mounting the speed measuring gear, and a limiting recess is provided in the middle of the limiting groove for mounting a steel ball to ensure that the speed measuring gear and the splined shaft are relatively stationary and do not produce rotational displacement.

[0009] The planetary reducer with speed measurement function disclosed in this utility model has a sensor mounting position designed on the housing for installing the sensor. The sensor mounting position is designed with a limit step to ensure that the distance between the front end of the sensor and the speed measuring gear is controlled within a reasonable range after the sensor is installed. This device can control the sensor installation accuracy within ±0.3mm to ensure that the acquired signal is stable and reliable.

[0010] Furthermore, the limiting groove consists of two annular grooves arranged circumferentially along the spline shaft. These annular grooves are adapted to the retaining spring, allowing the retaining spring to abut against the end faces of the speed measuring gear. The distance between the two annular grooves is equal to the tooth width of the speed measuring gear, effectively working with the retaining spring to confine the speed measuring gear between the retaining springs, ensuring that the speed measuring gear and the spline shaft are relatively stationary.

[0011] Furthermore, the limiting groove includes an open end and a closed end, wherein the open end is enclosed by a polyhedron that holds the steel ball, and the distance between the opposite faces of the open end is equal to the diameter of the steel ball.

[0012] Furthermore, the closed end has an inverted conical structure, and the steel ball includes an embedded part and a protruding part. The embedded part is embedded in the limiting groove, and the protruding part protrudes out of the limiting groove.

[0013] Furthermore, the retaining ring and the speed measuring gear form a cavity to accommodate the protrusion of the steel ball.

[0014] Furthermore, the housing is a segmented variable diameter structure, including a bearing mounting position and an oil seal sensor mounting position arranged sequentially, wherein the inner diameter of the bearing mounting position is larger than the inner diameter of the oil seal sensor mounting position.

[0015] Furthermore, a second limiting groove is provided on one side of the bearing mounting position near the bottom of the bearing, the top of the bearing abuts against the spline shaft, and a third limiting groove is provided on the bearing to cooperate with the second limiting groove. The second limiting groove and the third limiting groove are provided on the two side walls of the diagonal of the bearing.

[0016] Furthermore, an L-shaped connecting arm is provided between the bearing mounting position and the oil seal sensor mounting position.

[0017] Furthermore, the housing is provided with a sensor mounting position with a T-shaped cross-section, including a top groove for the sensor mounting position and an extension groove for the sensor mounting position, wherein the inner diameter of the extension groove for the sensor mounting position is larger than the outer diameter of the speed sensor.

[0018] Furthermore, the central axis of the speed sensor coincides with the central axis of the limiting groove.

[0019] The advantages of this utility model compared to the prior art are:

[0020] 1. This utility model's planetary reducer with speed measuring function achieves accurate installation of the speed measuring gear and splined shaft through a reasonable arrangement of the housing, splined shaft, speed measuring gear, and speed sensor. Limit grooves are designed on both the splined shaft and the speed measuring gear, with a steel ball installed in the middle of each groove to limit their relative position and ensure no rotational displacement. Simultaneously, an annular groove is designed on the splined shaft to install retaining rings. Two retaining rings are installed at both ends of the splined shaft to clamp the speed measuring gear in the middle, preventing axial displacement of the speed measuring gear.

[0021] 2. To achieve speed measurement, the planetary reducer of this utility model features a newly designed input component. The original structure has been optimized by adding components such as a sensor and a speed-measuring gear to meet speed measurement requirements. This newly designed input component can be applied to various scenarios requiring speed measurement. The input component interface is variable and can be matched with different hydraulic motors and planetary reducers. This structure has a wide range of applications, a relatively simple overall structure, no oil contamination at the sensor location, and reliable quality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a planetary gear reducer in the prior art.

[0023] Figure 2 This is a schematic diagram of the overall structure of the planetary reducer with speed measurement function described in the utility model.

[0024] Figure 3 This is a schematic diagram of the housing structure of the planetary reducer with speed measurement function described in the utility model.

[0025] Figure 4 This is a schematic diagram of the splined shaft structure of the planetary reducer with speed measurement function described in the utility model.

[0026] Among them, 1-oil seal, 2-housing, 3-bearing, 4-spline shaft, 5-speed measuring gear, 6-steel ball, 7-circlip, 8-speed sensor, 9-cavity, 10-oil seal sensor mounting position, 20-sensor mounting position, 41-limiting groove one, 42-limiting groove, 100-connecting arm, 201-sensor mounting position top groove, 202-sensor mounting position extension groove, 300-limiting groove two, 400-limiting groove three, 421-open end, 422-closed end. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Example 1

[0028] like Figures 2-4 As shown, the planetary reducer with speed measurement function in this embodiment includes a housing 2 and a splined shaft 4 disposed inside the housing 2. A bearing 3 is installed between one end of the housing 2 and the splined shaft 4, and a speed measuring gear 5 and a speed sensor 8 are provided at the other end. The speed measuring gear 5 is installed on the housing 2 and is mounted circumferentially on the splined shaft 4. The speed measuring gear 5 and the speed sensor 8 are spaced apart to meet the speed measurement requirements. A limit groove 41 is provided on the outer edge of the splined shaft 4 for installing the speed measuring gear 5, and a limit groove 42 is provided in the middle of the limit groove 41 for installing the steel ball 6, ensuring that the speed measuring gear 5 and the splined shaft 4 are relatively stationary and do not produce rotational displacement.

[0029] The housing 2 is designed with a sensor mounting position 20 for mounting the speed sensor 8. The sensor mounting position 20 is designed with a limit step to ensure that the distance between the front end of the sensor and the speed measuring gear is controlled within a reasonable range after the sensor is installed. This device can control the sensor installation accuracy within ±0.3mm to ensure that the acquired signal is stable and reliable.

[0030] The housing 2 has a T-shaped sensor mounting position 20, including a top groove 201 and an insertion groove 202. The inner diameter of the insertion groove 202 is larger than the outer diameter of the speed sensor 8. The entire speed sensor 8 is rod-shaped, wider in the middle than at both ends. Part of the speed sensor 8 is located outside the sensor mounting position 20, and part is located inside the sensor mounting position 20, minimizing space usage and maximizing space utilization. Furthermore, for high accuracy, the central axis of the speed sensor 8 coincides with the central axis of the limiting groove 42. That is, the entire speed sensor 8 is positioned in the middle of the speed measuring gear 5.

[0031] The limiting groove 41 consists of two annular grooves arranged circumferentially along the spline shaft 4. These annular grooves are adapted to the retaining spring 7, allowing the retaining spring 7 to abut against the end faces of the speed measuring gear 5. The distance between the two annular grooves is equal to the tooth width of the speed measuring gear. The width of the grooves is greater than or equal to the thickness of the retaining spring 7, which effectively works with the retaining spring to confine the speed measuring gear between the retaining springs, ensuring that the speed measuring gear and the spline shaft are relatively stationary.

[0032] The limiting groove 42 includes an open end 421 and a closed end 42. The open end 422 is a polyhedral enclosure that holds the steel ball 6, and the distance between opposite faces of the open end 422 is equal to the diameter of the steel ball 6. The closed end 422 has an inverted conical structure. The steel ball 6 includes an embedded part and a protruding part. The embedded part is embedded in the limiting groove 42, and the protruding part protrudes out of the limiting groove 42. The retaining ring 7 and the speed measuring gear 5 form a cavity 9 to accommodate the protruding part of the steel ball 6. In this structure, a steel ball is installed in the middle of the limiting groove to limit the movement and ensure that the two are relatively stationary and do not produce rotational displacement.

[0033] In this embodiment, the housing 2 is a segmented variable diameter structure, including a bearing mounting position and an oil seal sensor mounting position 10 arranged sequentially. The inner diameter of the bearing mounting position is larger than the inner diameter of the oil seal sensor mounting position 10. A limiting groove 300 is provided on one side of the bearing mounting position near the bottom of the bearing 3. The top of the bearing 3 abuts against the spline shaft 4. A limiting groove 400 that mates with the limiting groove 300 is provided on the bearing 3. The limiting grooves 300 and 400 are located on the two diagonal side walls of the bearing 3. An L-shaped connecting arm 100 is provided between the bearing mounting position and the oil seal sensor mounting position 10.

[0034] To achieve speed measurement functionality, the original structure was optimized by adding components such as sensors and speed-measuring gears to meet speed measurement requirements. This planetary gear reducer can be applied in various scenarios requiring speed measurement, and its input component interface is variable, allowing it to be matched with different hydraulic motors and planetary gear reducers. This structure has a wide range of applications, a relatively simple overall structure, no oil contamination at the sensor location, and reliable quality.

[0035] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the scope of this utility model, and these should also be considered within the protection scope of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A planetary reducer with speed measuring function, comprising a housing (2) and a splined shaft (4) disposed inside the housing (2); characterized in that, A bearing (3) is installed between one end of the housing (2) and the spline shaft (4), and a speed measuring gear (5) and a speed sensor (8) are provided at the other end. The speed measuring gear (5) is installed on the housing (2) and the speed measuring gear (5) is installed around the spline shaft (4). The speed measuring gear (5) and the speed sensor (8) are spaced apart to meet the speed measuring requirements. A limit groove (41) is provided on the outer edge of the spline shaft (4) for installing the speed measuring gear (5). A limit groove (42) is provided in the middle of the limit groove (41) for installing the steel ball (6) to ensure that the speed measuring gear (5) and the spline shaft (4) are relatively stationary and do not generate rotational displacement.

2. The planetary reducer with speed measuring function according to claim 1, characterized in that, The limiting groove (41) consists of two annular grooves arranged around the spline shaft (4). The annular grooves are adapted to the retaining ring (7) so that the retaining ring (7) abuts against the end faces of the speed measuring gear (5).

3. The planetary reducer with speed measuring function according to claim 1, characterized in that, The limiting groove (42) includes an open end (421) and a closed end (422). The open end (422) is a polyhedron that holds the steel ball (6). The distance between the opposite faces of the open end (422) is equal to the diameter of the steel ball (6).

4. The planetary reducer with speed measuring function according to claim 3, characterized in that, The closed end (422) has an inverted conical structure. The steel ball (6) includes an embedded part and a protruding part. The embedded part is embedded in the limiting groove (42), and the protruding part protrudes out of the limiting groove (42).

5. The planetary reducer with speed measuring function according to claim 4, characterized in that, The snap ring (7) and the speed measuring gear (5) form a cavity (9) to accommodate the protrusion of the steel ball (6).

6. The planetary reducer with speed measuring function according to claim 5, characterized in that, The housing (2) is a segmented variable diameter structure, including a bearing mounting position and an oil seal sensor mounting position (10) arranged in sequence. The inner diameter of the bearing mounting position is larger than the inner diameter of the oil seal sensor mounting position (10).

7. The planetary reducer with speed measuring function according to claim 6, characterized in that, A limiting groove 2 (300) is provided on one side of the bearing mounting position near the bottom of the bearing (3). The top of the bearing (3) abuts against the spline shaft (4). A limiting groove 2 (400) is provided on the bearing (3) to cooperate with the limiting groove 2 (300). The limiting groove 2 (300) and the limiting groove 3 (400) are provided on the two side walls of the diagonal of the bearing (3).

8. The planetary reducer with speed measuring function according to claim 7, characterized in that, A connecting arm (100) with an L-shaped cross-section is provided between the bearing mounting position and the oil seal sensor mounting position (10).

9. The planetary reducer with speed measuring function according to any one of claims 3-8, characterized in that, The housing (2) is provided with a sensor mounting position (20) with a T-shaped cross-section, including a sensor mounting position top groove (201) and a sensor mounting position extension groove (202). The inner diameter of the sensor mounting position extension groove (202) is larger than the outer diameter of the speed sensor (8).

10. The planetary reducer with speed measuring function according to claim 9, characterized in that, The central axis of the speed sensor (8) coincides with the central axis of the limiting groove (42).

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