JP2005069849A - Torque detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect the torque of a rotating member by suppressing to minimum the effect of friction. <P>SOLUTION: A disk brake device B comprises a brake disk 32 fixed to a rotation axis 31 being a wheel shaft, a brake caliper 36 supported to a fixing part 33 like a bracket, and a friction engaging member coupling the brake caliper 36 with the brake disk 32. The brake caliper 36 is supported to the fixing part 33 with a first and a second bolts 34 and 35, and is suspended to the first bolt 34 by way of a ball bearing 38. A load sensor 39 provided to the brake caliper 36 is contacted to the second bolt 35. As the brake caliper 36 is supported to the fixing part 33 by way of a ball bearing 38, friction effect is reduced and the detection accuracy of the brake torque working on the brake caliper 36 can be enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a torque detection device that detects torque of a rotating member that is rotatably supported around a rotation axis based on a load of the rotating member that is detected by a load sensor disposed at a position spaced from the rotation axis.

The tip of the arm extending radially outward from the rotating member rotating around the rotation axis is brought into contact with the load sensor, and the rotating member is applied to the rotating member based on the load detected by the load sensor and the arm length from the rotating axis to the load sensor. A device for detecting the acting torque is known from Patent Document 1 below.
Japanese Patent Laid-Open No. 11-248559

  By the way, if friction acts on the support portion that supports the rotating member, the output of the load sensor decreases due to the influence of the friction when detecting the torque of the rotating member, and therefore the torque of the rotating member is smaller than the actual torque. There was a problem that would be detected.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to make it possible to accurately detect the torque of a rotating member while minimizing the influence of friction.

  In order to achieve the above object, according to the first aspect of the present invention, the torque of the rotating member supported rotatably around the rotation axis is detected by a load sensor arranged at a position spaced from the rotation axis. In the torque detecting device for detecting based on the load of the rotating member, a torque detecting device is proposed in which the rotating member is supported via a rolling bearing. According to the second aspect of the present invention, in addition to the configuration of the first aspect, the torque detector includes a brake disk fixed to the rotating shaft, a brake caliper fixed to the fixed portion, and a brake caliper that brakes the brake caliper. There is proposed a torque detecting device for detecting a braking torque of a disc brake device having a friction engagement member coupled to a disc, wherein the rotating member is a brake caliper.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the brake caliper is supported on the fixed portion by the first and second bolts, and the first bolt constitutes the rotation axis. A torque detection device is proposed in which a load sensor provided on a brake caliper is brought into contact with a second bolt.

  According to the invention described in claim 4, in addition to the configuration of claim 1, the torque detection device includes a sun gear connected to the first shaft, a planetary carrier connected to the second shaft, and a sun gear. And a ring gear restraint torque of a planetary gear mechanism having a ring gear interlocked with a planetary carrier via a pinion and a clutch mechanism for restraining the ring gear to be non-rotatable. The rotating member is connected to the ring gear via a clutch mechanism. A torque detection device is proposed which is a ring member to be coupled.

  The roller bearings 14 and 49 and the ball bearing 38 of the embodiment correspond to the rolling bearing of the present invention, the brake calipers 15 and 36 and the ring member 48 of the embodiment correspond to the rotating member of the present invention, and the brake of the embodiment. The pads 19a and 19b correspond to the friction engagement member of the present invention.

  According to the configuration of the first aspect, when the torque of the rotating member is detected based on the load detected by the load sensor arranged at a position separated from the rotating axis, the rotating member is supported via the rolling bearing with low friction. Therefore, it is possible to eliminate the problem that the load is erroneously detected due to the influence of friction and to improve the torque detection accuracy.

  According to the configuration of the second aspect, the present invention is applied to a braking device including a brake disc fixed to the rotating shaft, a brake caliper fixed to the fixing portion, and a friction engagement member that couples the brake caliper to the brake disc. By doing so, it is possible to accurately detect the braking torque acting on the brake caliper during braking.

  According to the configuration of the third aspect, the first bolt of the first and second bolts that support the brake caliper on the fixed portion is the rotation axis, and the load sensor provided on the brake caliper is brought into contact with the second bolt. Therefore, it is possible to accurately detect the braking torque acting on the brake caliper by effectively using the first and second bolts.

  According to the configuration of the fourth aspect, the sun gear connected to the first shaft, the planetary carrier connected to the second shaft, the ring gear interlocked with the sun gear and the planetary carrier via the pinion, and the ring gear are non-rotatably restrained. Since the present invention is applied to a planetary gear mechanism including a clutch mechanism that performs a clutch mechanism, the ring gear restraint torque of the clutch mechanism is accurately detected when the clutch mechanism is operated to control the gear ratio between the first and second shafts. Can do.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 and 2 show a first embodiment of the present invention. FIG. 1 is a front view of the disc brake device (cross-sectional view taken along line 1-1 in FIG. 2), and FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. FIG.

  As shown in FIGS. 1 and 2, the disc brake device B that brakes the rotating shaft 11 that rotates in both the left and right directions is rotated via a roller bearing 14 and a brake disc 12 coupled to the rotating shaft 11 and a fixed portion 13. And a brake caliper 15 supported freely. The brake caliper 15 is formed by connecting the first caliper half 16 and the second caliper half 17 sandwiching the brake disk 12 with bolts 18... To a spline portion 16 a formed on the inner peripheral surface of the first caliper half 16. Two disk-like back plates 20a and 20b each provided with brake pads 19a and 19b capable of coming into contact with the brake disk 12 are supported so as to be movable in the direction of the rotation axis L. The brake caliper 15 is supported so as to be movable in the direction of the rotation axis L by a support means (not shown) with respect to the fixed portion 13.

  Pistons 22 and 22 are slidably fitted to the two cylinders 21 and 21 formed in the second caliper half 17, respectively, and oil chambers 23 and 23 formed on the back surfaces thereof are not shown in the drawing. Connected to the supply source. Both surfaces of the arm 16b extending radially outward from the first caliper half 16 abut against opposing surfaces of the pair of load sensors 24a and 24b fixed to the fixing portion 13.

  Thus, when the brake oil pressure does not act on the oil chambers 23, 23 of the second caliper half 17, the pair of brake pads 19 a, 19 b are separated from the brake disk 12, and no braking force acts on the rotating shaft 11. When brake hydraulic pressure is applied to the oil chambers 23, 23 of the second caliper half 17 to brake the rotary shaft 11, the pistons 22, 22 move forward to press one of the back plates 20a, and the reaction causes the brake caliper 15 to move. Moves to the pistons 22 and 22 side, so that the pair of brake pads 19 a and 19 b abut against both surfaces of the brake disk 12 to brake the rotating shaft 11.

  At this time, the brake caliper 15 tries to rotate around the rotation axis L by being dragged by the rotation of the brake disk 12. For example, when a braking torque in the direction of arrow r in FIG. 1 acts on the brake caliper 15, the arm 16b compresses one load sensor 24a to detect the load F. Therefore, if the distance from the rotation axis L to the load sensor 24a is A, the braking torque T is calculated as T = F × A. Conversely, when a braking torque in the direction of the arrow r ′ in FIG. 1 acts on the brake caliper 15, the arm 16b compresses the other load sensor 24b to detect the load F. Therefore, if the distance from the rotation axis L to the load sensor 24b is A, the braking torque T is calculated as T = F × A.

  At this time, if friction acts between the brake caliper 15 and the fixed portion 13, the load detected by the load sensors 24a and 24b is smaller than F, so that the braking torque T is detected smaller than the actual. become. However, in this embodiment, since the brake caliper 15 is supported by the fixed portion 13 via the roller bearing 14 with extremely small friction, the influence of the friction can be minimized and the detection accuracy of the braking torque can be increased. .

  Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 3 shows a disc brake device B for a vehicle. First and second bolts 34 and 35 are attached to a fixing portion 33 such as a bracket to brake a brake disc 32 fixed to a rotating shaft 31 constituting an axle. A brake caliper 36 is supported, and the brake caliper 36 is provided with two pistons 37, 37 that advance by hydraulic pressure and drive friction engagement members 40, 40 including a brake pad and a back plate. The brake caliper 36 is rotatably supported around a rotation axis L of the first bolt 35 via a ball bearing 38, and the second bolt 35 loosely penetrates a long hole 36a formed in the brake caliper 36, It abuts on a load sensor 39 provided on the brake caliper 35.

  Thus, when the pistons 37, 37 are advanced by hydraulic pressure and the friction engagement members 40, 40 are pressed against the brake disc 32 to brake the rotary shaft 31, the brake caliper 36 is dragged by the brake disc 32 rotating in the direction of arrow r. The load f acts on the. Due to this load f, the brake caliper 36 tries to rotate around the first bolt 34 in the direction of the arrow R, so that the load sensor 39 contacting the second bolt 35 receives the reaction load F from the second bolt 35. . Therefore, if the distance between the first and second bolts 34 and 35 is A, the braking torque T received by the brake caliper 36 is given by T = F × A.

  Also in this case, since the brake caliper 36 is supported around the first bolt 34 by the ball bearing 38 with small friction, the braking torque received by the brake caliper 36 can be detected with high accuracy while minimizing the influence of the friction. Can do. In addition, the first bolt 34 of the first and second bolts 34, 35 that support the brake caliper 36 on the fixing portion 33 is the rotation axis L, and the load sensor 39 provided on the brake caliper 36 is in contact with the second bolt 35. As a result, the braking torque can be accurately detected by effectively using the first and second bolts 34 and 35.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  4 and 5 show a planetary gear mechanism P that arbitrarily controls the speed ratio between the first shaft 41 and the second shaft 42 arranged coaxially on the rotation axis L. FIG. The planetary gear mechanism P includes a sun gear 43, a ring gear 44, a planetary carrier 45, and pinions 47 that are supported on the planetary carrier 45 via pinion shafts 46 and mesh with the sun gear 43 and the ring gear 44. One shaft 41 is fixed to the sun gear 43, and the second shaft 42 is fixed to the planetary carrier 45.

  A ring member 48 disposed so as to surround the outer periphery of the ring gear 44 is rotatably supported by the housing 50 via a roller bearing 49, and a clutch mechanism 51 is provided between the ring gear 44 and the ring member 48. The clutch mechanism 51 includes a first friction engagement member 52 that fits on a spline portion 44 a formed on the outer periphery of the ring gear 44, and a second friction engagement that fits on a spline portion 48 a formed on the inner periphery of the ring member 48. And a clutch piston 54 which is connected to a drive source (not shown) and makes the first and second friction engagement members 52, 53, etc. closely contact each other.

  A pair of load sensors 55a and 55b are fixed to both surfaces of an arm 48b projecting radially outward from the outer periphery of the ring member 48. One load sensor 55a contacts the receiving surface 50a of the housing 50, and the other load sensor. 55 b abuts on a receiving surface 57 a of a load support member 57 provided on a bolt 56 screwed into the housing 50.

  Thus, the clutch gear 54 of the clutch mechanism 51 is driven to bring the first and second friction engagement members 52, 53, etc. into contact with each other, thereby coupling the ring gear 44 to the ring member 48 and restraining it from rotating. Then, the rotation input to the first shaft 41 is output to the second shaft 42 integrated with the planetary carrier 45 while being decelerated at a predetermined reduction ratio via the sun gear 43, the pinion 47... And the planetary carrier 45. . Conversely, the rotation input to the second shaft 42 is increased at a predetermined speed increase ratio and output from the first shaft 41.

  At this time, if the ring gear 44 is slipped with respect to the ring member 48 by adjusting the fastening torque of the clutch mechanism 51, the reduction ratio or the speed increase ratio between the first and second shafts 41 and 42 is set according to the slip amount. It can be controlled steplessly.

  Now, when the clutch mechanism 51 is generating the engagement torque, if the ring member 48 tries to rotate by being dragged by the engagement torque, the load sensor 55a, 55b is loaded with the load F according to the rotation direction of the arm 48b. , The engagement torque T of the clutch mechanism 51 is detected as F × A which is the product of the distance A from the rotation axis L and the load F. Also in this case, since the ring member 48 is supported by the housing 50 by the roller bearing 49 having a small friction, it is possible to accurately detect the fastening torque received by the ring member 48 while minimizing the influence of the friction. .

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the disc brake device B and the planetary gear mechanism P are illustrated, but the present invention can be applied to torque detection of a rotating member of any other device.

  In the third embodiment, load sensors 55a and 55b are provided on both sides of the arm 48b. However, a load sensor may be provided only on one side of the arm 48b. In this case, it is necessary to couple the arm 48b and the load sensor and to transmit both the compressive load and the tensile load from the arm 48b to the load sensor.

Front view of the disc brake device according to the first embodiment (sectional view taken along line 1-1 of FIG. 2) 2-2 sectional view of FIG. Front view of the disc brake device according to the second embodiment Front view of planetary gear mechanism according to the third embodiment (sectional view taken along line 4-4 in FIG. 5) Sectional view along line 5-5 in FIG.

Explanation of symbols

B Disc brake device L Rotating axis P Planetary gear mechanism 11 Rotating shaft 12 Brake disc 13 Fixed part 14 Roller bearing (rolling bearing)
15 Brake caliper (rotating member)
19a, 19b Brake pad (friction engagement member)
24a, 24b Load sensor 31 Rotating shaft 32 Brake disc 33 Fixed portion 34 First bolt 35 Second bolt 36 Brake caliper (rotating member)
38 Ball bearing (rolling bearing)
39 Load sensor 40 Friction engagement member 41 First shaft 42 Second shaft 43 Sun gear 44 Ring gear 45 Planetary carrier 47 Pinion 48 Ring member (rotating member)
49 Roller bearings (rolling bearings)
51 Clutch mechanism 55a, 55b Load sensor

Claims (4)

The load sensors (24a, 24b, 39, 55a, etc.) are arranged such that the torque of the rotating members (15, 36, 48) supported rotatably around the rotation axis (L) is located away from the rotation axis (L). In the torque detection device that detects based on the load of the rotating member (15, 36, 48) detected in 55b),
A torque detecting device, wherein the rotating member (15, 36, 48) is supported via a rolling bearing (14, 38, 49).   The torque detector includes a brake disc (12, 32) fixed to the rotating shaft (11, 31), a brake caliper (15, 36) fixed to the fixing portion (13, 33), and a brake caliper (15, 36). ) For detecting the braking torque of the disc brake device (B) provided with the friction engagement members (19a, 19b, 40) for coupling the brake discs (12, 32) to the brake disc (12, 32). 15. The torque detection device according to claim 1, wherein the torque detection device is 15, 36).   The brake caliper (36) is supported by the fixed portion (33) with the first and second bolts (34, 35). The first bolt (34) constitutes the rotation axis (L), and the brake caliper (36 3. The torque detection device according to claim 2, wherein a load sensor (39) provided on the second bolt (35) is brought into contact with the second bolt (35). The torque detector includes a sun gear (43) connected to the first shaft (41), a planetary carrier (45) connected to the second shaft (42), a sun gear (43) and a planetary carrier (45). A ring gear restraint torque of a planetary gear mechanism (P) including a ring gear (44) interlocked via a pinion (47) and a clutch mechanism (51) restraining the ring gear (44) so as not to rotate; The torque detecting device according to claim 1, wherein the rotating member is a ring member (48) coupled to a ring gear (44) via a clutch mechanism (51).