JPH09211015A - Differential-planetary-type double-speed sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to achieve the compact configuration of the entire constitution and high accuracy by providing a differential planetary gear part and precise and rough rotation detecting sensors at respective shafts, and arranging the respective rotation sensors on the same axes of the respective shafts. SOLUTION: In a differential-planetary-type double-speed sensor, a speed reducing part, which is provided between an input shaft 3 and an output shaft 7, is constituted of a compact differential planetary gear part 10. Furthermore, the differential planetary gear part 10 has the constitution with one planetary gear 14. Thusz the entire mechanism can be made more compact than conventional mechanisms. Furthermore, a precise rotation detecting sensor 5 for the input shaft is coaxially arranged for the input shaft 3 in the built-in pattern, and a rough rotation detecting sensor 8 for the output shaft is coaxially arranged for the output shaft 7 in the built-in pattern. Thus, each sensor forms a unitary body together with a case 1, and the entire shape can be constituted in a very small scale highly accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential planetary type double speed sensor, and more particularly, it uses a differential planetary gear unit and a built-in type rotation detecting sensor to make the entire structure compact and to improve accuracy. For new improvements for.

[0002]

2. Description of the Related Art Conventionally, this type of multi-speed / multi-rotation type sensor has been generally used, for example, 1X vs. 2 ⁿ X (for example,
1X pair 32X, but construction of 1X pair 64X, etc.) is employed, as the speed ratio configuration between seminal sensor coarse sensor and 2 ⁿ X side of 1X side, the speed reduction mechanism is employed comprising a plurality of spur gears ing. Further, as the fine and coarse sensors, a well-known servo mount type which is mounted on the outside of the case is adopted instead of the built-in type structure provided in the case.

[0003]

Since the conventional double-speed multi-rotation type sensor is constructed as described above, the following problems exist. That is, the reduction gear mechanism is composed of a plurality of spur gears, and due to its expanded configuration, a considerable range (area) is required, which makes it difficult to miniaturize and it is extremely difficult to miniaturize the entire shape. Further, since the fine and coarse sensors are mounted in parallel on the same plane outside the case, even if the case is miniaturized, the overall shape is enlarged and it is difficult to meet the needs for miniaturization.

The present invention has been made in order to solve the above problems, and in particular, it uses a differential planetary gear unit and a built-in type rotation detection sensor to reduce the overall shape and improve accuracy. An object of the present invention is to provide a differential planetary type double speed sensor adapted to measure.

[0005]

A differential planetary type double speed sensor according to the present invention is a double speed sensor in which an input shaft provided in a case is rotated a plurality of times and an output shaft is rotated once through a reduction unit. A differential planetary gear unit forming the reduction unit,
The input shaft includes a built-in type precise rotation detection sensor for a built-in type input shaft, and a built-in type coarse rotation detection sensor for a built-in type disposed coaxially with the output shaft, each of which is provided at each end position of the case. The rotation detection sensor is arranged at the same axial line position as each axis.

More specifically, the differential planetary gear unit comprises:
This is a configuration having one planetary gear.

More specifically, the differential planetary gear unit comprises:
This is a configuration having a pair of planet gears.

In the differential planetary type double speed sensor according to the present invention, the reduction mechanism provided between the input shaft and the output shaft is composed of a compact differential planetary gear unit, so that the entire mechanism is smaller than the conventional one. And the fine rotation detection sensor for the input shaft is coaxially arranged with a built-in type on the input shaft,
Since the coarse rotation detection sensor for the output shaft is coaxially arranged on the output shaft in a built-in type, each sensor is integrated with the case, and the overall shape can be made extremely small and highly accurate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a differential planetary type double speed sensor according to the present invention will be described in detail below with reference to the drawings. In FIG. 1, reference numeral 1 indicates a case whose overall shape is substantially box-shaped, and the input side 1a of this case is
An input shaft 3 is rotatably provided on a first bearing 2 provided at the built-in type (which is integrally provided inside the case 1 and fixed at an outer peripheral position of the input shaft 3 by a mounting screw 4). The input shaft precision rotation detection sensor 5 is provided coaxially with the input shaft 3. The fine rotation detection sensor 5 for the input shaft is composed of a well-known winding type synchronizer or resolver,
It is arranged in the recess 1 b on the end surface of the case 1.

An output shaft 7 is rotatably provided on the output side 1c of the case 1 through a pair of second bearings 6. The output shaft 7 projects from the case 1 to the outside, and the output shaft 7 At the outer peripheral position of the projecting portion 7a, a coarse rotation detection sensor 8 for the output shaft, which is a well-known winding type synchro or resolver that is coaxially arranged with the output shaft 7, is attached by a mounting screw 9 to a built-in type (of the case 1). It is integrally provided as an end face).

A well-known differential planetary gear unit 10 as a speed reducing unit disposed between the rotation detecting sensors 5 and 8 includes a first rotating body 11 provided on the input shaft 3 and the first rotating body. A first planetary gear 14 rotatably provided on the peripheral edge of the body 11 via a bearing 13, and a balance weight 11a located on the peripheral edge of the first rotary body 11 and serving as a counter for the first planetary gear 14. , An output gear 15 provided on the output shaft 7 and meshing with the first planetary gear 14, and a case side gear 16 integrally formed on the output side 1c of the case 1 and meshing with the first planetary gear 14. There is. The configuration shown in FIG. 1 is as schematically shown in FIGS. 2 and 3 only in its function, and the number of teeth of the output gear 15 is Z = 63,
When the number of teeth of the case side gear 16 is Z = 64, the differential planetary gear unit 10 has a gear ratio of 64-63 / 64 = 1/6.
4 and the input shaft 3 on the fine side is 64X, the output shaft 7 on the rough side is 1X. Therefore, the differential planetary gear unit 10 is more compact than the conventional spur gear structure, and the rotation detection sensors 5 and 8 are built-in type shafts in spite of the 1X to 64X double speed structure. , 7 and the same axial line position and coaxial arrangement, the shape of the multi-speed sensor itself is more compact than before, high accuracy (because there are few gear meshing points), and long life can be achieved.

The structure shown in FIGS. 4 to 6 is another embodiment of FIG. 1, and the same parts as those in FIG.
Only the parts different from FIG. 1 will be described. That is, FIG.
Balance weight 11a in the second planetary gear 14A
Then, the output gear 15 and the case side gear 16 mesh with the second planetary gear 14A, and as shown in FIG.
The number of teeth 5 and 16 is set to Z = 62 and Z = 64, and the planetary gear 1
If the number of teeth of 4, 14A is Z = 32, gear ratio = 64−
62/64 = 2/64 = 1/32, 32 on the fine side
X, 1X on the rough side. The ratio of the multiple speeds is not limited to this ratio and can be set arbitrarily.

[0013]

The differential planetary type double speed sensor according to the present invention comprises:
With the above configuration, the following effects can be obtained. That is, a built-in type fine rotation detection sensor and a coarse rotation detection sensor as sensors are provided on the input shaft and the output shaft coaxially with the shaft,
Since the reduction unit is composed of a compact differential planetary gear unit with a small number of gears, the overall shape of the compound speed sensor is downsized, the structure is simplified, and the accuracy is improved (each sensor is directly connected to each axis. Can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a differential planetary type double speed sensor according to the present invention.

FIG. 2 is a schematic functional configuration diagram of FIG.

FIG. 3 is a schematic functional configuration diagram of FIG. 1.

FIG. 4 is a sectional view showing another embodiment of FIG.

5 is a schematic functional configuration diagram of FIG. 4. FIG.

FIG. 6 is a schematic functional configuration diagram of FIG. 4.

[Explanation of symbols]

 1 Case 3 Input shaft 5 Precision rotation detection sensor for input shaft 7 Output shaft 8 Coarse rotation detection sensor for output shaft 10 Differential planetary gear unit 14, 14A Planetary gear

Claims (3)

[Claims] 1. A multi-speed sensor in which a plurality of input shafts (3) provided on a case (1) are rotated a plurality of times to rotate an output shaft (7) once through a speed reducing unit, and a difference between the speed reducing units is formed. A moving planetary gear unit (10), a built-in type fine rotation detection sensor for input shaft (5) coaxially arranged on the input shaft (3), and the output shaft (7)
A coarse rotation detection sensor for built-in type output shaft coaxially arranged (8), and each rotation detection sensor (5, 8) at each end position of the case (1) each shaft (3, A differential planetary type double speed sensor, which is arranged at the same axial position as 7). 2. The differential planetary type double speed sensor according to claim 1, wherein the differential planetary gear unit (10) has one planetary gear (14). 3. The differential planetary type double speed sensor according to claim 1, wherein the differential planetary gear unit (10) has a pair of planetary gears (14, 14A).