Sealed dynamic torque sensor

Abstract

The utility model discloses a sealed dynamic torque sensor, which comprises a shell and an elastic element, and the two ends of the elastic element are respectively and rotatably arranged on the shell through bearings; sealing elements are arranged between the outer diameter of the bearing and the shell and between the inner diameter of the bearing and the elastic element; the elastic element is connected in series with a rotating shaft of power equipment; a metal strain gauge is adhered to the elastic element; the metal strain gauge leads out a strain gauge signal through a collecting ring, and the strain gauge signal outputs a voltage value through a signal processing circuit. A sealed electric connector is arranged at the leading-out end of the shell; through the sealing arrangement of the dynamic torque sensor, the sealing performance of the sensor is improved, and the requirement of long-term working in the environments of salt mist, oil mist, rain and the like can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic torque sensors, and particularly to a sealed dynamic torque sensor. Background Art

[0002] The core power of equipment such as automobiles and ships is provided by rotating power devices such as electric motors, engines, and internal combustion engines. The output torque of the power device directly reflects the working state of the equipment. Measuring the dynamic torque of the power device is crucial. In some complex working conditions, environments such as salt spray, oil mist, and rain can cause damage to the dynamic torque sensor.

[0003] Since the torque output of the transmission device is mostly a rotating shaft, while power supply and signal acquisition need to be on fixed components, the problem of signal transmission between the rotating component and the fixed component needs to be solved. The sealed dynamic torque sensor uses a slip ring to transmit the signal of the elastic component rotating with the transmission shaft to the transmitter at the fixed end, and then the data is processed by the transmitter to output an output voltage of (0.2 - 4.8) V. The overall sensor is a sealed structure and can work for a long time in environments such as salt spray, oil mist, and rain. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sealed dynamic torque sensor. By sealing the dynamic torque sensor, the sealing performance of the sensor is improved, and the requirement of working for a long time in environments such as salt spray, oil mist, and rain can be met.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows: A sealed dynamic torque sensor includes a housing and an elastic element, wherein: both ends of the elastic element are rotatably installed on the housing through bearings; sealing elements are provided between the outer diameter of the bearing and the housing and between the inner diameter of the bearing and the elastic element; the elastic element is connected in series with the rotating shaft of the power device; a metal strain gauge is pasted on the elastic element; the strain gauge signal is led out through a slip ring, and the strain gauge signal outputs a voltage value through a signal processing circuit; a sealed electrical connector is provided at the lead-out end of the housing.

[0006] Further, as an improvement of the technical solution of the utility model, the sealing element includes a first O-ring, a second O-ring, a third O-ring, and a fourth O-ring; the bearing includes a first bearing and a second bearing; the first O-ring is provided between the outer diameter of the first bearing and the housing; the second O-ring is provided between the inner diameter of the first bearing and the elastic element; the third O-ring is provided between the outer diameter of the second bearing and the housing; the fourth O-ring is provided between the inner diameter of the second bearing and the elastic element.

[0007] As a further improvement of the utility model technical solution, first O-ring seal grooves and second O-ring seal grooves are respectively arranged at two ends of the elastic element; the second O-ring seal is installed on the first O-ring seal groove; the fourth O-ring seal is installed on the second O-ring seal groove.

[0008] As a further improvement of the utility model technical solution, the slip ring comprises a stator, a rotor and a carbon brush; the stator is installed inside the outer shell; the rotor is installed on the elastic element; one end of the carbon brush is connected with the stator, and the other end abuts against the circumference of the rotor.

[0009] As a further improvement of the utility model technical solution, a slip ring rotor positioning groove is arranged on the elastic element; the rotor is installed on the slip ring rotor positioning groove.

[0010] As a further improvement of the utility model technical solution, a cross groove structure is arranged on the torque sensitive part of the elastic element.

[0011] As a further improvement of the utility model technical solution, the metal strain gauge comprises 4 double metal strain gauges; the 4 double metal strain gauges are equally divided and pasted on the elastic element to form a full bridge circuit of 8 strain gauges.

[0012] As a further improvement of the utility model technical solution, the metal strain gauge is electrically connected with the slip ring through a connecting wire.

[0013] In summary, the utility model has the following beneficial effects:

[0014] The rotating part of the utility model is an elastic element. The elastic element is connected with the outer shell by a bearing. The inner and outer diameters of the bearing are sealed by a seal. The lead-out end adopts a sealed electrical connector to form a sealed shell, so that the sensor has a sealing characteristic and can meet the requirement of working for a long time in environments such as salt spray, oil mist and rain. When the metal strain gauge senses the strain value of the elastic element, the output signal is transmitted to the signal processing circuit through the slip ring. The signal processing circuit conditions and amplifies the output signal and outputs a voltage signal. The inner and outer diameters of the bearing are sealed by O-ring seals, which further improves the sealing performance of the sensor. By arranging a slip ring rotor positioning groove to ensure the installation positions of the rotor and the stator of the slip ring, a cross groove structure is arranged on the torque sensitive part of the elastic element to improve the sensitivity of the elastic element. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of a sealed dynamic torque sensor according to an embodiment of the present utility model;

[0017] Figure 2 It is a schematic diagram of the elastic element structure according to an embodiment of the present utility model;

[0018] Figure 3 For the Figure 2 A - A sectional view;

[0019] Figure 4 It is a schematic diagram of the bridge connection according to an embodiment of the present utility model;

[0020] Figure 5 It is a schematic diagram of the slip ring structure according to an embodiment of the present utility model;

[0021] Figure 6 It is the circuit schematic diagram of the signal processing circuit according to an embodiment of the present utility model.

[0022] The reference numerals in the drawings of the specification include: 1 - housing; 2 - screw sleeve; 3 - elastic element; 4 - second O - ring; 5 - first bearing; 6 - first O - ring; 7 - stud; 8 - screw M3; 9 - signal processing circuit; 10 - sealed electrical connector; 11 - nut; 12 - slip ring; 13 - third O - ring; 14 - second bearing; 15 - fourth O - ring; 16 - connecting wire; 17 - screw; 18 - metal strain gauge; 31 - first O - ring groove; 32 - second O - ring groove; 121 - stator; 122 - rotor; 123 - brush. Specific embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will change accordingly.

[0025] In the present utility model, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0027] The following further describes the present utility model in detail with reference to the attached drawings.

[0028] Refer to Figure 1, A sealed dynamic torque sensor, comprising a housing 1 and an elastic element 3, wherein: both ends of the elastic element 3 are rotatably mounted on the housing 1 through bearings; the bearings are mounted on the housing 1 through a screw sleeve 2; sealing members are provided between the outer diameter of the bearings and the housing 1 and between the inner diameter of the bearings and the elastic element 3; the elastic element 3 is connected in series with the rotating shaft of the power equipment; a metal strain gauge 18 is pasted on the elastic element 3; the metal strain gauge 18 leads out the strain gauge signal through a slip ring 12, and the strain gauge signal outputs a voltage value through a signal processing circuit 9; a sealed electrical connector 10 is provided at the lead-out end of the housing 1, and the sealed electrical connector 10 is fixed to the housing 1 by a screw M3 8. The rotating part of the present utility model is the elastic element 3. The elastic element 3 is connected to the housing 1 by bearings. The inner and outer diameters of the bearings are sealed by sealing members, and the lead-out end uses a sealed electrical connector 10 to form a sealed housing, enabling the sensor to have a sealing characteristic and meeting the requirement of long-term operation in environments such as salt spray, oil mist, and rain. When the metal strain gauge 18 senses the strain value of the elastic element 3, the output signal is transmitted to the signal processing circuit 9 through the slip ring 12. The signal processing circuit 9 conditions and amplifies the output signal and outputs a voltage signal of (0.2 - 4.8) V, as Figure 6 shown.

[0029] Specifically, in the solution of this embodiment, the sealing members include a first O-ring 6, a second O-ring 4, a third O-ring 13, and a fourth O-ring 15; the bearings include a first bearing 5 and a second bearing 14; the first O-ring 6 is provided between the outer diameter of the first bearing 5 and the housing 1; the second O-ring 4 is provided between the inner diameter of the first bearing 5 and the elastic element 3; the third O-ring 13 is provided between the outer diameter of the second bearing 14 and the housing 1; the fourth O-ring 15 is provided between the inner diameter of the second bearing 14 and the elastic element 3. It should be noted that the inner and outer diameters of the bearings are sealed with O-rings, further improving the sealing performance of the sensor, enabling the sensor to work long-term in environments such as salt spray, oil mist, and rain.

[0030] As Figure 2 shown, specifically, in the solution of this embodiment, first O-ring grooves 31 and second O-ring grooves 32 are respectively provided at both ends of the elastic element 3; the second O-ring is mounted on the first O-ring groove 31; the fourth O-ring 15 is mounted on the second O-ring groove 32. It should be noted that by providing the first O-ring groove 31 and the second O-ring groove 32, it is convenient for the assembly of the second O-ring and the fourth O-ring 15, improving the work efficiency and at the same time improving the overall sealing performance of the sensor.

[0031] AsFigure 5 As shown, specifically, in the solution of this embodiment, the slip ring 12 includes a stator 121, a rotor 122, and a brush 123; the stator 121 is installed inside the housing 1; the rotor 122 is installed on the elastic element 3; one end of the brush 123 is connected to the stator 121, and the other end abuts against the circumference of the rotor 122. It should be noted that the brush 123 at the fixed end of the slip ring 12 and the annular electrode at the rotating end are installed in a pre-tightened manner to ensure good contact. The slip ring 12 is installed on the housing 1 through studs 7 and nuts 11.

[0032] Specifically, in the solution of this embodiment, a slip ring rotor positioning groove is provided on the elastic element 3; the rotor is installed on the slip ring rotor positioning groove. It should be noted that by providing the slip ring rotor positioning groove, the installation positions of the rotor and stator of the slip ring are ensured, effectively improving the assembly efficiency and at the same time ensuring that the slip ring can work properly.

[0033] Specifically, in the solution of this embodiment, a cross-slot structure is provided in the torque-sensitive part of the elastic element 3 to improve the sensitivity of the elastic element 3.

[0034] Specifically, in the solution of this embodiment, the metal strain gauge 18 includes 4 double metal strain gauges; the 4 double metal strain gauges are equally divided and pasted on the elastic element 3 to form a full-bridge circuit of 8 strain gauges. As Figure 3 and Figure 4 shown. The 4 double metal strain gauges are respectively the G1, G2, G3, and G4 double metal strain gauges.

[0035] Specifically, in the solution of this embodiment, the metal strain gauge 18 is electrically connected to the slip ring through a connecting wire 16. The connecting wire 16 is fixed to the metal strain gauge 18 by a screw 17.

[0036] The above are only embodiments of the present utility model. Specific structures and common knowledge such as characteristics well known in the art are not described in detail herein. Those of ordinary skill in the art know all the common general technical knowledge in the technical field to which the utility model belongs before the filing date or the priority date, are able to know all the prior art in this field, and have the ability to apply the conventional experimental means before this date. Those of ordinary skill in the art can, under the inspiration given in this application, combine their own abilities to improve and implement this solution. Some typical well-known structures or well-known methods should not become an obstacle for those of ordinary skill in the art to implement this application. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A sealed dynamic torque sensor, comprising a housing and an elastic element, characterized in that: The two ends of the elastic element are rotatably mounted on the outer shell through bearings; seals are provided between the outer diameter of the bearing and the outer shell, and between the inner diameter of the bearing and the elastic element; the elastic element is connected in series with the rotating shaft of the power equipment; a metal strain gauge is pasted on the elastic element; the metal strain gauge leads out the strain gauge signal through a collector ring, and the strain gauge signal outputs a voltage value through a signal processing circuit; a sealed electrical connector is provided at the lead-out end of the outer shell.

2. A sealed dynamic torque sensor according to claim 1, characterized in that: The seal includes a first O-ring, a second O-ring, a third O-ring and a fourth O-ring; the bearing includes a first bearing and a second bearing; the first O-ring is arranged between the outer diameter of the first bearing and the outer shell; the second O-ring is arranged between the inner diameter of the first bearing and the elastic element; the third O-ring is arranged between the outer diameter of the second bearing and the outer shell; the fourth O-ring is arranged between the inner diameter of the second bearing and the elastic element.

3. A sealed dynamic torque sensor according to claim 2, characterized in that: The two ends of the elastic element are respectively provided with a first O-ring groove and a second O-ring groove; the second O-ring is installed on the first O-ring groove; and the fourth O-ring is installed on the second O-ring groove.

4. A sealed dynamic torque sensor according to claim 1, characterized in that: The collector ring comprises a stator, a rotor and a brush; the stator is installed inside the housing; the rotor is installed on the elastic element; one end of the brush is connected to the stator, and the other end abuts against the circumference of the rotor.

5. A sealed dynamic torque sensor according to claim 4, characterized in that: The elastic element is provided with a collector ring rotor positioning groove; the rotor is mounted on the collector ring rotor positioning groove.

6. The sealed dynamic torque sensor according to claim 1, characterized in that: The torque sensitive portion of the elastic element is provided with a cross groove structure.

7. A sealed dynamic torque sensor according to claim 6, characterized in that: The metal strain gauge comprises four double-piece metal strain gauges; the four double-piece metal strain gauges are equally pasted on the elastic element to form a full-bridge circuit of eight strain gauges.

8. The sealed dynamic torque sensor according to claim 1, characterized in that: The metal strain gauge is electrically connected to the collector ring via a connecting wire.

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