Torque sensor

A torque sensor comprising:

• a body,
• a first gastight chamber defined at least partly by the body,
• a pressure sensor connected with the gastight chamber for measuring the pressure in the gastight chamber, and a pressure to torque converter connected to the pressure sensor, wherein the gastight chamber is arranged to change a volume of the gastight chamber by deformation of the body when the body is subjected to a torque, wherein the body is arranged to be twisted when subjected to the torque, and wherein the volume change causes a change of pressure of the enclosed gas in the gastight chamber;
• wherein the first gastight chamber is defined by a first chamber housing comprising a first main wall, which constitutes a portion of the body that comprises deformation enhancing portions, and which is arranged to change measures of the first main wall when the body is subjected to the torque, thereby changing the volume of the gastight chamber;
• the torque sensor additionally comprising a second gastight chamber defined by a second chamber housing comprising a second main wall, which constitutes a portion of the body that comprises deformation enhancing portions, and which is arranged to change measures of the second main wall when the body is subjected to the torque, thereby changing the volume of the second gastight chamber, said changes of volume of the first and second gastight chambers being an increase of the volume of one of the first and second gastight chambers and a decrease of the volume of the other when the body is subjected to the torque, wherein the pressure sensor is arranged to measure a pressure difference between the first and the second gastight chambers;
• and
• wherein the deformation enhancing portions comprise grooves, wherein the torque sensor comprises an outer sleeve arranged coaxially with the body and covering the grooves, and wherein the first and second chamber housings further comprise respective portions of the sleeve covering the grooves.

A torque sensor comprising:

• a body,
• a first gastight chamber defined at least partly by the body,
• a pressure sensor connected with the gastight chamber for measuring the pressure in the gastight chamber, and a pressure to torque converter connected to the pressure sensor, wherein the gastight chamber is arranged to change a volume of the gastight chamber by deformation of the body when the body is subjected to a torque, wherein the body is arranged to be twisted when subjected to the torque, and wherein the volume change causes a change of pressure of the enclosed gas in the gastight chamber;
• wherein the first gastight chamber is defined by a first chamber housing comprising a first main wall, which constitutes a portion of the body that comprises deformation enhancing portions, and which is arranged to change measures of the first main wall when the body is subjected to the torque, thereby changing the volume of the gastight chamber;
• the torque sensor additionally comprising a second gastight chamber defined by a second chamber housing comprising a second main wall, which constitutes a portion of the body that comprises deformation enhancing portions, and which is arranged to change measures of the second main wall when the body is subjected to the torque, thereby changing the volume of the second gastight chamber, said changes of volume of the first and second gastight chambers being an increase of the volume of one of the first and second gastight chambers and a decrease of the volume of the other when the body is subjected to the torque, wherein the pressure sensor is arranged to measure a pressure difference between the first and the second gastight chambers;
• and
• the torque sensor comprising opposite first and second end portions arranged to be connected with external devices, said first and second gastight chambers being consecutively positioned between the first and second end portions, wherein the deformation enhancing portions comprise several grooves extending obliquely to a torque axis (B) of the torque sensor, which torque axis extends between the first and second end portions.