Gearbox gear wear stress and gear inner shaft vibration detection device and gearbox

Abstract

The utility model discloses a gearbox gear wear stress and gear inner shaft vibration detection device and a gearbox wherein the gearbox gear wear stress and gear inner shaft vibration detection device comprises a first sensor arranged on a gearbox gear and second sensors coaxially arranged at two ends of each gear inner shaft. A first sensor is arranged on each tooth of the gearbox gear, the first sensor is arranged at the tooth root of each tooth of the gear and attached to the peripheral face of a gear body, and the second sensor comprises a first sensing part and a second sensing part. And the first sensing part and the second sensing part are respectively arranged on one end surface of the gear inner shaft. In the scheme, the first sensor senses the stress change of the gear, the second sensor obtains the wear condition of the gear inner shaft through the vibration state of the gear inner shaft, the first sensor and the second sensor detect independently and are jointly used for judging the gear condition of the gearbox, and multi-directional synchronous detection is achieved.

Description

Technical Field

[0001] The utility model relates to the field of gearboxes, in particular to a device for detecting the wear stress of gearbox gears and the vibration of inner shafts of gears and a gearbox. Background Technique

[0002] When the gearbox gears and the inner shafts of the gears are in operation, torque needs to be transmitted to the next unit. Long-term alternating loads will cause wear on the gearbox gears and the inner shafts of the gears arranged on the inner circumference of the gearbox gears, and then cracks will appear. To avoid failures caused by damage between the gear shafts, it is necessary to detect the wear state of the gearbox gears and the inner shafts of the gears in real time. Therefore, the traditional open-box detection is not advisable. The common detection method is to set sensors in the gearbox. For example, the utility model patent with the authorization announcement number CN202431893U provides a wear monitoring sensor for an automotive gearbox, which is provided with a power supply part, a signal processing part, a grating part, and a rotating part; the main grating of the rotating part of the sensor, together with a light-emitting diode as a light source, a secondary grating, and a silicon photocell, constitutes a measurement circuit; by outputting an electrical signal, it is processed by the electrical signal processing part, the electrical signal is shaped and amplified, and then output to the intelligent monitoring device of the vehicle. However, the detection by a single type of induction device is prone to false detection, which affects the normal operation of the gearbox. Moreover, the existing induction devices have insufficient sensitivity. When the data changes, the gearbox gears and the inner shafts of the gears in the gearbox have already been worn and damaged, and the abrasive debris generated during the wear process will affect the operation of other components. Content of the Utility Model

[0003] Therefore, to solve the above problems, the utility model provides a device for detecting the wear stress of gearbox gears and the vibration of inner shafts of gears and a gearbox.

[0004] The utility model is realized through the following technical solutions:

[0005] A detection device for the wear stress of a gearbox gear and the vibration of the inner shaft of the gear is arranged inside the gearbox and is used to detect the wear stress of the gearbox gear and the vibration state of the inner shaft of the gear. The gearbox gear includes a gear main body and teeth arranged at equal angles on the outer circumference of the gear main body. It includes a first sensor arranged on the gearbox gear and a second sensor coaxially arranged at both ends of each inner shaft of the gear. Each tooth of the gearbox gear is provided with a first sensor. The first sensor is arranged at the tooth root of each tooth of the gear and is attached to the outer circumferential surface of the gear main body, so that the fixed position of each first sensor is the same as the radial distance from the gear axis. Each first sensor is respectively connected to a first optical fiber, and all the first optical fibers are connected to a first optical fiber rotator. The second sensor includes a first induction part and a second induction part. The first induction part and the second induction part are respectively arranged on one end face of the inner shaft of the gear, and the first induction part and the second induction part are respectively connected to a second optical fiber, and the two second optical fibers are connected to a second optical fiber rotator.

[0006] Preferably, the first sensor is a strain gauge pressure sensor, and the second sensor is a capacitive vibration sensor.

[0007] Preferably, the first induction part of the second sensor is a first electrode plate arranged on one end face of the inner shaft of the gear, and the second induction part is a second electrode plate arranged on the other end face of the inner shaft of the gear.

[0008] Preferably, one side of the first sensor is adhered to the tooth root of each tooth of the gearbox gear by glue, and the other side is fixed to the outer circumference of the gear main body of the gearbox gear by glue.

[0009] Preferably, the first optical fiber rotator is also connected to a pressure / resistance converter.

[0010] Preferably, a number of interfaces are arranged on both the first optical fiber rotator and the second optical fiber rotator. The first optical fiber is connected to the interface on the first optical fiber rotator, and the second optical fiber is connected to the interface on the second optical fiber rotator.

[0011] A gearbox includes the detection device for the wear stress of the gearbox gear and the vibration of the inner shaft of the gear as described above.

[0012] The beneficial effects of the technical solution of the present utility model are mainly reflected in:

[0013] 1. The operating conditions of the transmission gear and its inner shaft are sensed respectively by a first sensor disposed on the tooth of the transmission gear and a second sensor disposed at both ends of the inner shaft of the gear. Among them, the first sensor senses the stress change of the gear, and the second sensor obtains the wear condition of the inner shaft of the gear through the vibration state of the inner shaft of the gear. And the two are independently detected and jointly used to judge the condition of the transmission gear, realizing multi-directional synchronous detection, thereby avoiding affecting the safety performance of the transmission operation due to misdetection.

[0014] 2. Thresholds can be set respectively for the first sensor and the second sensor according to actual needs, and the changes of the transmission gear are sensed in real time by the first sensor and the second sensor, improving the detection sensitivity, ensuring timely feedback when the inner shaft of the gear generates vibration deflection or when the stress and strain change due to wear or fracture during the meshing of the transmission gear, facilitating the prevention of the continuous rotation of the inner gear shaft inside the transmission and preventing other components from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the transmission gear wear stress and inner shaft vibration detection device inside the transmission;

[0016] Figure 2 is a schematic diagram of the installation state of the transmission gear wear stress and inner shaft vibration detection device on the transmission gear;

[0017] Figure 3 is a sectional view of the installation state of the transmission gear wear stress and inner shaft vibration detection device on the transmission gear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to clearly and detailedly show the purpose, advantages and features of the present utility model, it will be illustrated and explained through the non-restrictive description of the following preferred embodiments. This embodiment is only a typical example of applying the technical solution of the present utility model, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present utility model.

[0019] At the same time, it is stated that in the description of the solution, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0020] In addition, the terms "first" and "second" in this solution are only for descriptive purposes and cannot be construed as indicating or implying a ranking of importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In this utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0021] This utility model discloses a device for detecting the wear stress of a gearbox gear and the vibration of the inner shaft of the gear, as Figure 1 shown, which is arranged inside the gearbox and is used to detect the wear stress of the gearbox gear and the vibration state of the inner shaft of the gear. The gearbox gear includes a gear body and teeth arranged at equal angles on the outer periphery of the gear body.

[0022] As Figure 2 、 Figure 3 shown, the device for detecting the wear stress of the gearbox gear and the vibration of the inner shaft of the gear includes a first sensor 1 arranged on the gearbox gear and a second sensor 2 coaxially arranged at both ends of each inner shaft of the gear. The first sensor 1 is used to detect in real time the stress received at the tooth root of the gearbox gear, and thus sense the stress and strain changes caused by the wear or fracture of the transmission gear during meshing. The second sensor 2 is used to monitor in real time the vibration state of the inner shaft of the gear, and thus sense the vibration deflection of the inner shaft of the gear in the wear state.

[0023] Among them, a first sensor 1 is arranged on each tooth of the gearbox gear. The first sensor 1 is arranged at the tooth root of each tooth of the gear and is attached to the outer peripheral surface of the gear body, so that the radial distance between the fixed position of each first sensor 1 and the gear axis is the same, ensuring that stress and strain monitoring data can be obtained for each meshing and the rotation of the inner shaft of the gear, and ensuring the uniformity of the detection positions of the first sensors 1 located on different teeth. Each first sensor 1 is respectively connected to a first optical fiber 3, and all the first optical fibers 3 are connected to a first optical fiber rotator 5. The second sensor 2 includes a first induction part 201 and a second induction part 202. The first induction part 201 and the second induction part 202 are respectively arranged on one end face of the inner shaft of the gear, and the first induction part 201 and the second induction part 202 are respectively connected to a second optical fiber 4, and the two second optical fibers 4 are connected to a second optical fiber rotator 6.

[0024] In some embodiments, the first sensor 1 is a strain gauge pressure sensor, and the second sensor 2 is a capacitive vibration sensor. Among them, the first sensing part 201 of the second sensor 2 is a first electrode plate disposed on one end face of the inner shaft of the gear, and the second sensing part 202 is a second electrode plate disposed on the other end face of the inner shaft of the gear. According to the capacitance formula: C = εA / d (where C represents capacitance, ε represents the dielectric constant on both sides of the shaft end, A represents the electrode area, and d represents the distance between the electrodes), it can be known that the capacitance will change according to the change in the distance between the two electrode plates disposed at both ends of the inner shaft of the gear. Therefore, by monitoring the change amplitude of the capacitance, the position change state between the electrode plates at both ends of the inner shaft of the gear can be obtained, and further, it can be determined whether the inner shaft of the gear is in a vibration / wear state.

[0025] In one embodiment, one side of the first sensor 1 is adhered to the tooth root of each tooth of the transmission gear by glue, and the other side is fixed to the outer circumference of the gear body of the transmission gear by glue. Since the gear body is fixedly connected to the inner shaft of the gear, stress and strain monitoring data can be obtained every time the transmission gear meshes and the inner shaft of the gear rotates. In one embodiment, the first optical fiber rotator 5 is further connected to a pressure sensor, and the pressure sensor is connected to a pressure / resistance converter. Through the pressure / resistance converter, the stress and strain data can be converted into a resistance value and transmitted to the main control system, and it can be determined whether the stress change of the transmission gear in the meshing state is within the normal range according to the resistance value signal, so as to determine whether the transmission gear is worn.

[0026] A number of interfaces (not shown in the figure) are provided on both the first optical fiber rotator 5 and the second optical fiber rotator 6. The first optical fiber 3 is connected to the interface on the first optical fiber rotator 5, and the second optical fiber 4 is connected to the interface on the second optical fiber rotator 6. Since the transmission gear and the inner shaft of the gear continuously rotate during operation, the first optical fiber rotator 5 and the second optical fiber rotator 6 rotate synchronously with the transmission gear and the inner shaft of the gear, which can prevent the first optical fiber 3 and the second optical fiber 4 from being broken during rotation or affecting the normal operation of the transmission. The connection structure between the first optical fiber 4 and the first optical fiber rotator 5, the connection structure between the second optical fiber 4 and the second optical fiber rotator 6, and the specific structures of the first optical fiber rotator 5 and the second optical fiber rotator 6 can refer to the prior art and will not be elaborated here.

[0027] The present utility model also discloses a transmission, including the transmission gear wear stress and inner shaft vibration detection device as described above.

[0028] There are still various implementation manners of the present utility model. All technical solutions formed by equivalent transformation or equivalent substitution fall within the protection scope of the present utility model.

Claims

1. A detection device for the wear stress of transmission gears and the vibration of the inner shaft of the gears, which is arranged in the transmission and used to detect the wear stress of the transmission gears and the vibration state of the inner shaft of the gears. The transmission gears include a gear body and teeth arranged at equal angles on the outer periphery of the gear body, and it is characterized in that: It includes a first sensor disposed on the transmission gear and a second sensor coaxially disposed at both ends of the inner shaft of each gear. The first sensor is disposed on each tooth of the transmission gear, and the first sensor is disposed at the tooth root of each tooth of the gear and is in contact with the outer peripheral surface of the gear body, so that the fixed position of each first sensor is the same as the radial distance from the gear axis. Each first sensor is respectively connected to a first optical fiber, and all the first optical fibers are connected to a first optical fiber rotator. The second sensor includes a first induction part and a second induction part. The first induction part and the second induction part are respectively disposed on one end face of the inner shaft of the gear, and the first induction part and the second induction part are respectively connected to a second optical fiber, and the two second optical fibers are connected to a second optical fiber rotator.

2. The gear wear stress and inner shaft vibration detection device for a gearbox according to claim 1, wherein: The first sensor is a strain gauge pressure sensor, and the second sensor is a capacitive vibration sensor.

3. The gear wear stress and gear inner shaft vibration detection device for a gearbox according to claim 2, characterized in that: The first induction part of the second sensor is a first electrode plate disposed on one end face of the inner shaft of the gear, and the second induction part is a second electrode plate disposed on the other end face of the inner shaft of the gear.

4. The gear wear stress and inner shaft vibration detection device for a gearbox according to claim 1, characterized in that: One side of the first sensor is adhered to the tooth root of each tooth of the transmission gear by glue, and the other side is fixed to the outer periphery of the gear body of the transmission gear by glue.

5. The gear wear stress and gear inner shaft vibration detection device for a gearbox according to claim 1, characterized in that: The first optical fiber rotator is also connected to a pressure / resistance converter.

6. The gear wear stress and gear inner shaft vibration detection device for a gearbox according to claim 1, characterized in that: A number of interfaces are provided on both the first optical fiber rotator and the second optical fiber rotator. The first optical fiber is connected to the interface on the first optical fiber rotator, and the second optical fiber is connected to the interface on the second optical fiber rotator.

7. Transmission, characterized in that: It includes a transmission gear wear stress and inner shaft vibration detection device according to any one of claims 1-6.

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