JPS6283632A - Torque sensor - Google Patents

Abstract

PURPOSE:To detect a torque as a stress generated in a fixed member, by constructing a measuring sensor of a torque generated in a power train with the No.1 rotating shaft projecting outward from the center of a gear and the No.2 rotating shaft mounted parallel to an arm and connecting them with a gear train integrating a stress sensor and mounted on a fixed member. CONSTITUTION:A spur gear 2 as the No.1 sun gear is fixed to the No.1 rotating shaft projecting outward and a spur gear 4 as the No.1 planetary gear is engaged on its periphery. Next, an arm 9 with the No.2 rotating shaft 10 which sticks out parallel to this gear train with the specified distance is installed and the gear train and this arm 9 are connected with a supporting member 7 integrating a stress sensor 7a and two geared shafts 3 including a spur gear 6 as the No.2 sun gear. later, the fixed member 7 side of the shaft 3 is fixed to a fixed member 8. Thus, a stress generated in the member 8 is detected as a torque and measuring accuracy and reliability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a torque sensor, and more particularly to a torque sensor for measuring torque generated in a vehicle power transmission system.

<Prior Art> There are cases where it is desired to measure the torque generated in the power transmission system of a vehicle. For example, in a four-wheel drive vehicle that uses a relative rotational speed responsive clutch such as a viscous clutch to distribute drive torque between the front and rear wheels of the vehicle, it is possible to control the relative rotational speed responsive clutch or improve vehicle usability. In order to improve this, it is preferable to be able to measure the amount of drive torque distributed to the front and rear wheels. Furthermore, by knowing the drive torque applied to the wheels, the slip rate of the tires can be determined, and the braking force or drive torque to be applied to the wheels can be suitably controlled, as well as advanced control of automatic transmissions. It becomes possible.

Furthermore, it is also possible to display the drive force ratio and drive torque of each axis, each wheel, or the drive torque to the driver.Although there is a demand for such a torque sensor, it is not always practical enough. Moreover, there was no reliable torque sensor.

For example, in Japanese Patent Application Laid-Open No. 53-10618M,
A torque sensor using a strain gauge has been proposed, but since the strain gauge is attached to a rotating body such as a rotating shaft, a slip ring or the like is required to extract the signal, making it impractical for practical use. Not necessarily suitable. Additionally, a non-contact torque sensor using magnetism, as proposed in Japanese Patent Application Laid-open No. 58-143228, is also considered, but the structure tends to be complicated and the measurement values need to be calibrated. There is an inconvenience.

<Problems to be Solved by the Invention> In view of these shortcomings of the prior art, the main object of the present invention is to provide accurate 1-lux detection without requiring a slip ring or the like and with a simple structure. It is possible to provide 1 ~ Luxenna (?).

<Means for Solving the Problems> According to the present invention, such an object is to detect the torque transmitted between the first rotating shaft and the second rotating shaft. The sensor includes a first sun gear integrally formed at a free end of the first rotating shaft, a first planetary gear meshing with the first sun gear, and a first planetary gear connected to the first planetary gear. A second "i" star gear coaxially and integrally fixed to the integrally formed gear shaft meshes with the second planetary gear and is supported by the fixed member via a support means. a second sun gear, an arm rotatably supporting the gear shaft and integrally connected to the second rotating shaft, and a bending support means for measuring an amount corresponding to stress generated in the bending support means; This is achieved by providing a torque sensor characterized by comprising a sensor.

<Operation> In this way, since the transmitted torque is measured by measuring the reaction force applied to the gear fixedly supported by the fixed member, the measurement accuracy and reliability can be easily improved without the need for a slip ring. can be improved.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are explanatory diagrams schematically showing a first embodiment of a torque sensor based on the present invention.

A spur gear 2 as a first lean gear fixed to the free end of the first rotating shaft 1 meshes with a spur gear 4 as a first planetary gear, and a gear shaft 3 integrally formed with the spur gear. A spur gear 5 as a second planetary gear is coaxially and integrally fixed. The spur gear 5 as a second planetary gear meshes with a ring gear 6 as a second lean gear supported by a fixed member 8 via a support member 7 . The gear shaft 3 is rotatably supported by an arm 9, and a second rotating shaft 10 is integrally fixed to the arm.

According to this embodiment, from the first rotating shaft 1 to the second rotating shaft 1
0, j~silk is performed by the reduction ratio shown below, and the transmitted reaction force of 1~ruk is applied to the ring gear 6, and this is used as stress in the support means 7 to be applied to the stress sensor 7.
It can be detected by a.

When the number of teeth of gear 2 is Zl, the number of teeth of gear 4 is Z2, the number of teeth of gear 5 is Z3, and the number of teeth of gear 6 is Z4, the gear ratio of the second rotating shaft 10 to the first rotating shaft 1 is R is R=1/(1+n) where n=Z2 Z4 /ZI Z3 FIG. 3 is an explanatory diagram showing a second embodiment of the torque sensor' based on the present invention. A bevel gear 12 as a first sun gear formed at the free end of the first rotating shaft 11 meshes with a bevel gear 14 as a first planetary gear. Does the bevel gear 14 integrally have the gear shaft 13, and the bevel gear 15 as the second planetary gear N2 is coaxial with the gear shaft? −
It is integrally formed. A bevel gear 15 serving as a second planetary gear meshes with a bevel gear 16 serving as a second sun gear supported by a fixed member 18 via a support member 17 . Also, the gear \7 shaft 13 of both planetary gears is
The arm 19 is rotatably supported by the arm 19, and a second rotating shaft 20 is fixed to the arm 19. The bevel gears 21 and 22 are idler gears for equalizing the thrust force applied to both MN gears.

In the case of this embodiment as well, torque is transmitted from the first rotating shaft 11 to the second rotating shaft 20 according to the reduction ratio expressed by the above formula, and the transmitted torque is transmitted to the second 1st gear. The stress sensor 17a provided on the support means 17 detects the reaction force exerted on the bevel gear 16 as follows.

In the above embodiment, the transmitted torque was measured as the stress generated in the support member, but instead of the stress sensor, an elastic member was provided between the second sun gear and the fixed member, and this elastic member The reaction force applied to the second sun gear due to the displacement, that is, the transmitted torque may be detected.

<Effects of the Invention> As described above, according to the present invention, it is possible to detect the transmission 1 to 1 torque as the stress generated in the fixed member, so it is possible to easily improve the measurement accuracy and reliability, and the The effect is extremely human.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a first embodiment of a torque sensor based on the present invention. FIG. 2 is a schematic sectional view taken along the line ■--■ in FIG. 1. FIG. 3 is an explanatory diagram showing a second embodiment of the torque sensor based on the present invention. 1.11... First rotating shaft 2.12... First sun gear 3.13... Gear shaft 4.14... First "f1"
Star gear 5.15...Second planet gear 6.16...Second sun gear 7.1'7...Support member 7a, 17a...Stress sensor 8.18...Fixing member 9 .19...Arm 1
0.20...Second rotating shaft Figure 1 Figure 2

Claims (3)

[Claims] (1) A torque sensor for detecting torque transmitted between a first rotating shaft and a second rotating shaft, the torque sensor being integrally formed at the free end of the first rotating shaft. a first sun gear, a first planetary gear that meshes with the first sun gear, and a second planetary gear that is coaxially and integrally fixed to a gear shaft that is integrally formed with the first planetary gear. a planetary gear; a second sun gear that meshes with the second planetary gear and is supported by a fixed member via a support means; and a second sun gear that rotatably supports the gear shaft and that supports the second rotating shaft. A torque sensor comprising: an arm integrally connected to the support means; and a sensor for measuring an amount corresponding to stress generated in the support means. (2) The torque sensor according to claim 1, wherein the second sun gear is a ring gear. (3) The torque sensor according to claim 1, wherein all of the gears are bevel gears.