CN113945300A

CN113945300A - Wireless passive sensor and bearing assembly

Info

Publication number: CN113945300A
Application number: CN202010612189.5A
Authority: CN
Inventors: 关冉; 贺思传; 吕熠; 陈义刚
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-01-18

Abstract

The invention relates to a wireless passive sensor and a bearing assembly. The wireless passive sensor comprises a reading module, wherein the reading module is used for reading the temperature of an object to be measured, the reading module comprises a sensing head, a temperature chip and a reading antenna, the sensing head is installed on a fixing piece and used for being in contact with the object to be measured so as to sense the temperature of the object to be measured, the temperature chip is configured to be in contact with the sensing head so as to obtain the temperature sensed by the sensing head, generate a temperature signal related to the temperature of the object to be measured according to the sensed temperature and transmit the temperature signal to the reading antenna, and the reading antenna is used for being communicated with a reading module of the wireless passive sensor so as to transmit the temperature signal.

Description

Wireless passive sensor and bearing assembly

Technical Field

The present invention relates to the field of bearings, and in particular to wireless passive sensors and bearing assemblies.

Background

Bearings are widely used in mechanical equipment to support a mechanical rotating body, reduce the friction coefficient of the mechanical rotating body during movement and ensure the revolution accuracy thereof. It has been recognized that temperature has a significant effect on the service life of bearings. Therefore, the temperature of the bearing during operation is of great concern. Currently, the devices for detecting the temperature of the bearings either require frequent maintenance, are costly, or are structurally complex.

Disclosure of Invention

It is an object of the present invention to provide a wireless passive sensor and bearing assembly that requires less maintenance, is less costly, and has a simpler construction.

One aspect of the present invention provides a wireless passive sensor, which includes a reading module for reading a temperature of an object to be measured,

wherein the content of the first and second substances,

the reading module comprises a sensing head, a temperature chip and a reading antenna, wherein the sensing head is used for being in contact with the object to be measured to sense the temperature of the object to be measured, the temperature chip is configured to be in contact with the sensing head to obtain the temperature sensed by the sensing head, generate a temperature signal related to the temperature of the object to be measured according to the sensed temperature and transmit the temperature signal to the reading antenna, and the reading antenna is used for being communicated with a reading module of the wireless passive sensor to transmit the temperature signal.

According to an embodiment of the present invention, the fixing member is configured as a hollow bolt, and the sensing head is provided at a first end of the hollow bolt, the reading antenna is provided at a second end of the hollow bolt opposite to the first end, and the temperature chip and the reading antenna are electrically connected via a cable.

According to an embodiment of the invention, an elastic member is provided inside the hollow bolt, and a limit member limiting the position of the sensing head is provided at the first end of the hollow bolt, one end of the elastic member being fixed and the other end abutting against the sensing head, so that the sensing head is provided at the first end of the hollow bolt in a manner telescopic in the longitudinal direction of the hollow bolt under the action of both the elastic member and the limit member.

According to an embodiment of the present invention, one end of the sensing head is provided with a flange that is freely movable inside the hollow bolt, and the elastic member and the stopper are respectively provided on both sides of the flange in the longitudinal direction of the hollow bolt.

According to an embodiment of the invention, an inner recess is provided at an end face of the second end of the hollow bolt, the wireless passive sensor comprises a cover cap fixed at the inner recess, and the reading antenna is provided in a space defined by the inner recess and the cover cap.

According to an embodiment of the invention, the stop member is provided as a nut threadedly connected to the hollow bolt at the first end, and the nut is provided with a through hole for the sensing head to pass through.

According to an embodiment of the invention, the cover is configured to be screwed with the inner recess.

According to an embodiment of the present invention, the hollow bolt is provided with an inner step surface, and the inner step surface abuts against one end of the elastic member.

According to an embodiment of the present invention, an end of the hollow bolt to which the reading antenna is fixed is provided with a bolt flange.

According to the embodiment of the invention, the temperature chip is arranged in the inner cavity of the sensing head, and one end of the sensing head, which is used for contacting the target object to be measured, is arranged to be hemispherical.

According to an embodiment of the invention, the hollow bolt is provided with a threaded portion at least partially on an outer circumferential surface thereof.

According to an embodiment of the invention, a rubber gasket is further arranged between the reading antenna and the cover.

According to an embodiment of the invention, the sensing head is made of a metallic material, and the temperature chip is bonded in the inner cavity of the sensing head.

Another aspect of the invention provides a bearing assembly comprising a bearing and a wireless passive sensor according to any preceding claim, wherein the mount of the wireless passive sensor is secured to the bearing such that the sensing head of the wireless passive sensor is in contact with a radially inner or a radially outer member of the bearing,

wherein the radially inner and outer members are each configured to cooperate with one outer member to effect movement between the outer members independently of one another, and at least one of the radially inner and outer members is configured as a rotary member that rotates about an axis of rotation.

According to an embodiment of the invention, the bearing is configured as a rolling bearing, the mounting is fixed on an end cap of the bearing, and the sensing head is in contact with an outer ring of the bearing.

Drawings

Fig. 1 schematically illustrates a wireless passive sensor according to an embodiment of the invention.

FIG. 2 schematically illustrates a bearing assembly according to an embodiment of the invention.

Detailed Description

Specific embodiments of a wireless passive sensor and bearing assembly according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.

In addition, spatially relative terms (such as "upper," "lower," "left," and "right," etc.) are used to describe one element's relative positional relationship with another element as illustrated in the figures. Spatially relative terms may therefore apply in other orientations than those illustrated in the figures, when used. It will be apparent that although for ease of illustration all of these spatially relative terms refer to the orientation shown in the drawings, those skilled in the art will appreciate that orientations other than those shown in the drawings may be used.

Fig. 1 schematically illustrates a wireless passive sensor according to an embodiment of the invention. A wireless passive sensor according to an embodiment of the invention is described below with reference to fig. 1.

As shown in fig. 1, a wireless passive sensor according to an embodiment of the present invention is shown, which includes a reading module 10, wherein the reading module 10 is used for reading the temperature of an object to be measured. The read module 10 shown in fig. 1 is described in detail below.

With continued reference to FIG. 1, the reader module 10 includes a sensing head 100, a temperature chip 200, and a reader antenna 300, all mounted on a fixture. And, the temperature chip 200 is disposed in the inner cavity of the sensing head 100, and one end (i.e., a single-acting end in fig. 1) of the sensing head 100 for contacting the target object to be measured is disposed in a hemispherical shape. According to one embodiment of the invention, the fixing is configured as a hollow bolt 400. And, the sensing head 100 is disposed at a first end (i.e., left end in fig. 1) of the hollow bolt 400, the reading antenna 300 is disposed at a second end (i.e., right end in fig. 1) of the hollow bolt 400 opposite to the first end, and the temperature chip 200 and the reading antenna 300 are electrically connected via the cable 500 to communicate with each other. Specifically, the sensing head 100 is used to contact with an object to be measured to sense a temperature of the object to be measured, the temperature chip 200 is configured to contact with the sensing head 100 to obtain the temperature sensed by the sensing head 100, generate a temperature signal related to the temperature of the object to be measured according to the sensed temperature, and transmit the temperature signal to the reading antenna 300, and the reading antenna 300 is used to communicate with the readout module 30 (shown in fig. 2) of the wireless passive sensor to transmit the temperature signal. According to an embodiment of the present invention, the reading antenna 300 is used to receive and transmit electromagnetic waves to transmit a temperature signal and obtain power.

Further, as shown in fig. 1, one end of the sensing head 100 is provided with a flange 101 that can freely move inside the hollow bolt 400, in other words, the outer diameter of the flange 101 is set smaller than the inner diameter of the hollow bolt 400. And, an elastic member 600 is provided at an inner side of the hollow bolt 400 and a stopper 800 is provided at the first end, the elastic member 600 and the stopper 800 are respectively provided at both sides of the flange 101 in a longitudinal direction of the hollow bolt 400, the elastic member 600 may be, for example, a spring, and the stopper 800 provided at the first end of the hollow bolt 400 serves to limit the position of the sensing head 100. Specifically, one end (i.e., the right end in fig. 1) of the elastic member 600 is fixed, and according to an exemplary embodiment of the present invention, an inner step surface 403 is provided on the hollow bolt 400, the inner step surface 403 abutting against the left end of the elastic member 600 to fix the end of the elastic member 600 when the elastic member 600 is in a compressed state; and, the other end (i.e., the left end in fig. 1) of the elastic member 600 abuts on the sensing head 100, so that the sensing head 100 is disposed at the first end of the hollow bolt 400 in a manner to be telescopic in the longitudinal direction of the hollow bolt 400 by both the elastic member 600 and the stopper 800. It can be understood that the elastic member 600 abuts against the sensing head 100 with its left end in a compressed state to ensure that the sensing head 100 is in good contact with the object to be measured; accordingly, the stopper 800 serves to prevent the sensing head 100 from falling off the hollow bolt 400 by the elastic force applied by the elastic member 600.

According to an embodiment of the present invention, the stopper 600 is provided as a nut that is screw-coupled with the hollow bolt 400 at the first end, and the nut is provided with a through-hole for the sensing head 100 to pass through.

With continued reference to fig. 1. As shown in fig. 1, an inner recess 402 is provided at an end face of the second end of the hollow bolt 400, the wireless passive sensor includes a cover 700 fixed at the inner recess 402, and the reading antenna 300 is disposed in a space defined by the inner recess 402 and the cover 700. As one example, the cap 700 may be configured to be threadably connected with the internal recess 402. And, in order to tightly fix the reading antenna 300, a rubber gasket is further provided between the reading antenna 300 and the cover 700. Further, one end of the hollow bolt 400 to which the reading antenna 300 is fixed is provided with a bolt flange 401, and it can be understood that the bolt flange 401 facilitates fixing and positioning of the reading module 10.

According to an embodiment of the invention, the hollow bolt is provided with a threaded portion at least partially on an outer circumferential surface thereof. This is merely an example, however, and riveting, welding or interference fitting may be used instead of the threaded portion, i.e., the fixing member is not limited to a hollow bolt.

According to an embodiment of the invention, the sensing head is made of a metallic material and the temperature chip is bonded in the inner cavity of the sensing head, for example using a high temperature resistant glue.

Therefore, the sensing head, the temperature chip and the reading antenna in the reading module of the wireless passive sensor are arranged on the fixing piece, and therefore, the wireless passive sensor has the advantages of being low in maintenance requirement, low in cost and simple in structure.

FIG. 2 schematically illustrates a bearing assembly according to an embodiment of the invention. A bearing assembly according to an embodiment of the invention is described below with reference to fig. 2.

As shown in fig. 2, a bearing assembly of an embodiment of the present invention includes a bearing and a wireless passive sensor. The wireless passive sensor comprises a reading module 10, which has been described in detail in the foregoing, and further comprises a readout module 30, the readout module 30 comprising a readout antenna 301, a cable 302, a reader 303 and a central monitor 304, the readout antenna 301 communicating with the reading antenna 300 of the reading module 10, the cable 302 electrically connecting the readout antenna 301 and the reader 303, the temperature signal being transmitted via the readout antenna 301, the cable 302 and the reader 303 to the central monitor 304 and being signal processed by the central monitor 304. It can be seen that the read-out module 10 and the read-out module 30 are arranged at a distance. In particular, the bearing is configured as a rolling bearing, the mounting in the form of a hollow bolt 400 of the reading module 10 is fixed on an end cap of the rolling bearing, thereby fixing the reading module 10 of the wireless passive sensor, and the sensing head of the reading module 10 is in contact with the outer ring 20 of the rolling bearing to read the temperature of the outer ring 20.

It should be noted that the above is only an example, the wireless passive sensor of the present invention can detect a stationary object to be detected and a rotating object to be detected, and the fixing member of the reading module is not limited to be fixed on the end cap of the rolling bearing, but may be fixed at other positions of other types of bearings. And, the bearing in the bearing assembly of the present invention is not limited to a rolling bearing, and thus is not limited to including an inner ring and an outer ring, but may include a radially inner member or a radially outer member, wherein the radially inner member and the radially outer member are respectively configured to cooperate with one outer member to effect movement between the outer members independently of each other, and at least one of the radially inner member and the radially outer member is configured as a rotary piece that rotates about a rotation axis.

As described above, although the exemplary embodiments of the present invention have been described in the description with reference to the drawings, the present invention is not limited to the above-described embodiments, and the scope of the present invention should be defined by the claims and their equivalents.

Claims

1. A wireless passive sensor comprises a reading module (10), wherein the reading module (10) is used for reading the temperature of an object to be measured,

it is characterized in that the preparation method is characterized in that,

the reading module (10) comprises a sensing head (100), a temperature chip (200) and a reading antenna (300) which are installed on a fixed piece, wherein the sensing head (100) is used for contacting with the object to be measured so as to sense the temperature of the object to be measured, the temperature chip (200) is configured to contact with the sensing head (100) so as to obtain the temperature sensed by the sensing head (100), generate a temperature signal related to the temperature of the object to be measured according to the sensed temperature and transmit the temperature signal to the reading antenna (300), and the reading antenna (300) is used for communicating with a reading module (30) of the wireless passive sensor so as to transmit the temperature signal.

2. The wireless passive sensor according to claim 1, wherein the fixture is configured as a hollow bolt (400), and the sensing head (100) is arranged at a first end of the hollow bolt (400), the reading antenna (300) is arranged at a second end of the hollow bolt (400) opposite to the first end, and the temperature chip (200) and the reading antenna (300) are electrically connected via a cable (500).

3. A wireless passive sensor according to claim 2, wherein an elastic member (600) is provided inside the hollow bolt (400), and a limit member (800) limiting the position of the sensing head (100) is provided at the first end of the hollow bolt (400), one end of the elastic member (600) being fixed and the other end abutting against the sensing head (100), such that the sensing head (100) is provided at the first end of the hollow bolt (400) in a manner telescopic in the longitudinal direction of the hollow bolt (400) under the action of both the elastic member (600) and the limit member (800).

4. The wireless passive sensor according to claim 3, wherein one end of the sensing head (100) is provided with a flange (100) freely movable inside the hollow bolt (400), and the elastic member (600) and the stopper member (800) are respectively provided on both sides of the flange (101) in a longitudinal direction of the hollow bolt (400).

5. The wireless passive sensor according to claim 4, wherein an inner recess (402) is provided at an end face of the second end of the hollow bolt (400), the wireless passive sensor comprises a cover cap (700) fixed at the inner recess (402), and the reading antenna (300) is provided in a space defined by the inner recess (402) and the cover cap (700).

6. The wireless passive sensor according to claim 5, wherein the stopper (800) is provided as a nut threadedly connected with the hollow bolt (400) at the first end, and wherein the nut is provided with a through hole for the sensing head (100) to pass through.

7. The wireless passive sensor of claim 6, wherein the cap (700) is configured to be threadably connected with the interior recess (402).

8. The wireless passive sensor according to claim 7, wherein the hollow bolt (400) is provided with an inner step surface (403), and the inner step surface (403) abuts against one end of the elastic member (600).

9. The wireless passive sensor according to claim 8, wherein the end of the hollow bolt (400) fixing the reading antenna (300) is provided with a bolt flange (401).

10. The wireless passive sensor according to claim 9, wherein the temperature chip (200) is arranged in an inner cavity of the sensing head (100), and one end of the sensing head (100) for contacting the target analyte is arranged in a hemispherical shape.

11. The wireless passive sensor according to claim 10, wherein the hollow bolt (400) is at least partially provided with a threaded portion on its outer circumferential surface.

12. The wireless passive sensor of claim 10, wherein a rubber gasket is further disposed between said read antenna and said cover.

13. The wireless passive sensor according to claim 12, wherein the sensing head (100) is made of a metallic material and the temperature chip (200) is glued in the inner cavity of the sensing head (100).

14. A bearing assembly, comprising a bearing and a wireless passive sensor according to any of claims 1-13, wherein the mounting of the wireless passive sensor is fixed on the bearing such that the sensing head (100) of the wireless passive sensor is in contact with a radially inner or a radially outer member of the bearing,

15. Bearing assembly according to claim 14, wherein the bearing is configured as a rolling bearing, the mount is fixed on an end cap of the bearing, and the sensing head (100) is in contact with an outer ring (20) of the bearing.