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CN-121977727-A - Torque sensor

CN121977727ACN 121977727 ACN121977727 ACN 121977727ACN-121977727-A

Abstract

The application relates to the field of sensors, in particular to a torque sensor. The torque sensor comprises a flange, a center shaft, a transition piece and an induction module, wherein the flange is provided with a containing cavity, the center shaft is positioned in the containing cavity, one end of the center shaft is integrally connected with the flange, the induction module comprises an induction body, the induction body is arranged in the containing cavity and positioned at the other end of the center shaft, and the transition piece is arranged between the induction body and the center shaft to absorb deformation of a connecting part. According to the torque sensor, one end of the central shaft is integrally connected with the flange, so that residual stress caused by assembly uncertainty and mechanical pretightening force due to screw fastening is avoided, the other end of the central shaft is connected with the inductor through the transition piece, the transition piece can absorb axial deformation and radial deformation caused by uneven thermal expansion in the welding process, and the welding thermal stress can be buffered and transferred to a sensitive sensing area, so that interference on the strain measurement precision of the inductor is reduced, and long-term stability is ensured.

Inventors

  • GUO CHUAN
  • LIU YANG
  • XU WEI
  • HU TIAN

Assignees

  • 浙江孔辉汽车科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. The torque sensor is characterized by comprising a flange (101), a middle shaft (102), a transition piece and an induction module; The flange (101) is provided with a containing cavity (103), the center shaft (102) is positioned in the containing cavity (103), and one end of the center shaft (102) is integrally connected with the flange (101); The induction module comprises an induction body (104), the induction body (104) is arranged in the accommodating cavity (103), the induction body (104) is positioned at the other end of the center shaft (102), and the transition piece is arranged between the induction body (104) and the center shaft (102) so as to absorb deformation of a connecting part.
  2. 2. The torque sensor according to claim 1, characterized in that the transition piece is a sleeve (105); The shaft sleeve (105) is sleeved at the end part of the middle shaft (102), and a first gap (121) is arranged between the shaft sleeve (105) and the middle shaft (102); The inductor (104) is sleeved on the circumference of the shaft sleeve (105).
  3. 3. The torque sensor according to claim 2, wherein the central shaft (102) comprises a main body portion (106) and an insert portion (107); One end of the main body part (106) is connected with the flange (101), the embedded part (107) is connected with the other end of the main body part (106), and a clamping surface (108) is arranged between the embedded part (107) and the main body part (106); The shaft sleeve (105) is provided with a first connecting hole (122), the embedded part (107) is adaptively arranged in the first connecting hole (122), and the first gap (121) is arranged between the embedded part (107) and the hole wall of the first connecting hole (122); one end of the shaft sleeve (105) close to the main body part (106) is clamped on the clamping surface (108), and the joint of the other end of the shaft sleeve (105) and the embedded part (107) is welded.
  4. 4. A torque sensor according to claim 3, wherein the insertion portion (107) is stepped, the first connection hole (122) is correspondingly configured as a stepped hole, and the insertion portion (107) is adapted to be mounted in the stepped hole.
  5. 5. A torque sensor according to claim 3, characterized in that the sensing body (104) comprises a first sensing portion (109) and a first connecting portion (110); The first induction part (109) is connected with one end of the first connecting part (110) far away from the main body part (106), and a second connecting hole (123) is correspondingly formed in the first induction part (109) and the first connecting part (110), wherein a part of the shaft sleeve (105) is positioned in the second connecting hole (123); A welding surface (111) is arranged on the circumference of the shaft sleeve (105), and one end, close to the main body part (106), of the first connecting part (110) is welded with the welding surface (111).
  6. 6. The torque sensor according to claim 5, characterized in that the first connection portion (110) is circumferentially provided with a reinforcement rib (112).
  7. 7. The torque sensor according to claim 1, wherein the transition piece is an inner ring spring (116); the inner ring elastic piece (116) is arranged around the end circumference of the center shaft (102), and the inductor (104) is arranged around the circumference of the inner ring elastic piece (116).
  8. 8. The torque sensor according to claim 1, characterized in that the transition piece is an adjustment sleeve (117); The adjusting sleeve (117) is connected with the end part of the middle shaft (102), the adjusting sleeve (117) comprises a plurality of elastic split pieces (118) which are arranged at intervals, and the elastic split pieces (118) are enclosed to form an installation cavity; The induction body (104) comprises a second induction part (119) and a second connecting part (120), the second induction part (119) is connected with one end, far away from the center shaft (102), of the second connecting part (120), and the second connecting part (120) is installed in the installation cavity.
  9. 9. The torque sensor according to claim 1, wherein the sensing module further comprises a first circuit board (113), a second circuit board (114) and a flex cable; The first circuit board (113) is arranged at one end of the inductor (104) far away from the center shaft (102), and the second circuit board (114) is arranged at one end of the inductor (104) near to the center shaft (102); The first circuit board (113) and the second circuit board (114) are electrically connected through the flexible flat cable, and a socket which is electrically connected with the outside is arranged on the first circuit board (113).
  10. 10. The torque sensor according to claim 1, wherein the sensing module further comprises an outer ring spring (115); The outer ring elastic piece (115) is located between the induction body (104) and the inner side wall of the flange (101), and the outer ring elastic piece (115) is arranged around the induction body (104).

Description

Torque sensor Technical Field The application relates to the field of sensors, in particular to a torque sensor. Background The torque sensor is a key component for measuring torque transmitted by a rotating shaft and is widely applied to the fields of automobile manufacturing, aerospace, machining and the like. In high-precision application scenarios, the structural design of the sensor has a decisive influence on the measurement precision, environmental adaptability and long-term stability of the sensor. The existing torque sensor adopts a split type structural design, one end of a central shaft of the sensor is welded with an inductor, the other end of the central shaft is arranged on a flange in a threaded connection mode, uncontrollable residual stress is easy to generate in the assembly process, so that zero drift of the sensor is caused, the measurement accuracy is influenced, and in order to ensure the measurement accuracy, the sensor with the residual stress needs to be subjected to standing or additional annealing treatment for a long time so as to promote stress release, prolong the production period and reduce the production efficiency. Disclosure of Invention The application aims to provide a torque sensor which can reduce uncontrollable residual stress generated in the assembly process and improve the measurement accuracy of the torque sensor. The application provides a torque sensor, which comprises a flange, a middle shaft, a transition piece and an induction module; the flange is provided with a containing cavity, the center shaft is positioned in the containing cavity, and one end of the center shaft is integrally connected with the flange; The sensing module comprises a sensing body which is arranged in the accommodating cavity and is positioned at the other end of the center shaft, and the transition piece is arranged between the sensing body and the center shaft so as to absorb deformation of the joint. In the above technical solution, further, the transition piece is a shaft sleeve; The shaft sleeve is sleeved at the end part of the center shaft, and a first gap is arranged between the shaft sleeve and the center shaft; The inductor is sleeved on the circumference of the shaft sleeve. In the above technical solution, further, the central shaft includes a main body portion and an insertion portion; one end of the main body part is connected with the flange, the embedded part is connected with the other end of the main body part, and a clamping surface is arranged between the embedded part and the main body part; The shaft sleeve is provided with a first connecting hole, the embedded part is adaptively arranged in the first connecting hole, and the first gap is arranged between the embedded part and the hole wall of the first connecting hole; one end of the shaft sleeve, which is close to the main body part, is clamped on the clamping surface, and the other end of the shaft sleeve is welded with the joint of the flush embedded part. In the above technical scheme, further, the embedded part is in a ladder shape, the first connecting hole is correspondingly arranged as a ladder hole, and the embedded part is adaptively installed in the ladder hole. In the above technical solution, further, the inductor includes a first induction portion and a first connection portion; The first induction part is connected with one end of the first connecting part far away from the main body part, and a second connecting hole is correspondingly formed in the first induction part and the first connecting part; The circumference of axle sleeve is provided with the welding face, first connecting portion be close to the one end of main part with the welding face welds. In the above technical solution, further, a reinforcing rib is disposed in a circumferential direction of the first connection portion. In the above technical solution, further, the transition piece is an inner ring elastic piece; the inner ring elastic piece is arranged around the end part of the center shaft, and the inductor is arranged around the periphery of the inner ring elastic piece. In the above technical solution, further, the transition piece is an adjusting sleeve; The adjusting sleeve comprises a plurality of elastic split pieces which are arranged at intervals, and a mounting cavity is formed by surrounding the elastic split pieces; The induction body comprises a second induction part and a second connecting part, the second induction part is connected with one end, far away from the center shaft, of the second connecting part, and the second connecting part is installed in the installation cavity. In the above technical solution, further, the induction module further includes a first circuit board, a second circuit board, and a flexible flat cable; The first circuit board is arranged at one end of the inductor, which is far away from the center shaft, and the second circuit board is arranged at one end of the inductor, which is cl