JPH0592565U - Planetary continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a planetary continuously variable transmission with a wide selection range of gear ratios. [Structure] A planetary stepless mechanism in which the planetary differential mechanism 14 connecting the input shaft 26 and the planetary gear mechanism 20 connecting the output shaft 32 are coaxially arranged so that the input / output shafts 26, 32 rotate in the same direction. A planetary continuously variable transmission characterized in that, in the transmission, a planetary gear that constitutes the planetary gear mechanism 20 is a two-stage planetary gear 34, and the planetary gears 34a and 34b are connected by a one-way clutch 36.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a planetary continuously variable transmission.

[0002]

[Prior Art]

 A planetary continuously variable transmission, which is a combination of a planetary differential mechanism and a planetary gear mechanism, is widely used as a transmission for traveling vehicles, etc., because it can continuously achieve a large gear ratio. FIG. 5 is an explanatory view showing an example thereof. A planetary differential mechanism 14 in which a transmission ring 12 is slidably contacted with an outer peripheral surface of an umbrella-shaped cone 10 arranged in a planet, and a planetary gear 18 and a planetary gear 18 are meshed with a planetary gear 18. This is a combination with the gear mechanism 20. That is, the input disc 22 and the output disc 24 are pressed against the umbrella-shaped cone 10, and the rotation ratio of the output disc 24 to the input disc 22 is changed by changing the position of the transmission ring 12. Is becoming.

In this case, an input shaft 26 is connected to the input disc 22 and the sun gear 16 is formed on the input shaft 26. On the other hand, the output disc 24 is connected to an internal gear 28, and the planet gear 18 is meshed between the internal gear 28 and the sun gear 16. The planet gear 18 is loosely fitted on the arm 30, and the arm 30 forms an output shaft 32.

[0004]

[Problems to be solved by the device]

 Since such a planetary continuously variable transmission can achieve a large gear ratio continuously and has a compact design, it is often used in a transmission such as a traveling vehicle as described above. Since the mechanism 20 is a set, it is undeniable that only these numbers of teeth are involved in the gear ratio and the selection range of the gear ratio is narrowed. The present invention solves such a problem and, in short, is intended to provide a planetary continuously variable transmission that increases the degree of freedom in selection of gear ratio and structural design.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention sets the planetary differential mechanism that connects the input shaft and the planetary gear mechanism that connects the output shaft on the same axis so that the input and output shafts rotate in the same direction. In a planetary continuously variable transmission, there is provided a planetary continuously variable transmission characterized in that a planetary gear that constitutes a planetary gear mechanism is a two-stage planetary gear and that each planetary gear is connected by a one-way clutch. .

[0006]

[Action]

 By adopting the above means, that is, because the planetary gears constituting the planetary gear mechanism are two-stage planetary gears, the range of selection of the gear ratio is wide. Since both planetary gears are connected by a one-way clutch, phase alignment during assembly is easy.

[0007]

【Example】

 FIG. 1 is an explanatory view of a planetary continuously variable transmission according to the present invention. The schematic configurations of the planetary differential mechanism 14 and the planetary gear mechanism 20 are the same as those described above, except that the planetary gear mechanism 20 is different. Instead of the planetary gear 18 constituting the above, a two-stage planetary gear 34 including a first planetary gear 34a and a second planetary gear 34b is used. In this case, the phase alignment between the first planetary gear 34a and the second planetary gear 34b becomes a problem, but to facilitate this, the second planetary gear 34b is connected to the first planetary gear 34a via the one-way clutch 36. Unite.

FIG. 2 is an explanatory view showing another embodiment. In this embodiment, a deadman in which a brake mechanism 40 is combined with a transmission composed of a planetary differential mechanism 14 and a switching gear mechanism 38. In the system, the switching gear mechanism 38 is configured so that the switching gear 42 is slidably engaged with the two driven gears 44 and 46. In this case, a backlash mechanism is provided when each driven gear 44, 46 is connected to its shaft 48, 50.

FIG. 3 and FIG. 4 are cross-sectional views showing a specific example thereof. For example, a hole 54 of the other side into which a driving means 52 such as a key or a dog provided on the shafts 48 and 50 is inserted is formed in the front and rear in the rotation direction. It is conceivable that a space is provided and the elastic bodies 56 and the like are inserted into both sides of the drive means 52 in this gap. By doing so, there is an advantage that the switching gear 42 can be smoothly switched.

[0010]

[Effect of the device]

 As described above, since the present invention is the one described above, that is, the planetary gear that constitutes the planetary gear mechanism of the planetary continuously variable transmission is a two-stage planetary gear, the degree of freedom in design is increased, and only that. Wide selection range of gear ratio. In particular, it is possible to increase the rotation speed of the output shaft higher than the conventional one. In addition, since the two-stage planetary gears are connected to each other by using a one-way clutch, the phase can be easily adjusted, and the precision of machining each gear is not required. This also helps reduce vibration and noise due to phase error.

[Brief description of drawings]

FIG. 1 is an explanatory view of a planetary continuously variable transmission according to the present invention.

FIG. 2 is an explanatory view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of a conventional planetary continuously variable transmission.

[Explanation of symbols]

 14 planetary differential mechanism 18 planetary gear 20 planetary gear mechanism 26 input shaft 32 output shaft 34 two-stage planetary gear 36 one-way clutch

Claims (1)

[Scope of utility model registration request] 1. A planetary continuously variable transmission in which a planetary differential mechanism for connecting an input shaft and a planetary gear mechanism for connecting an output shaft are coaxially arranged so that the input and output shafts rotate in the same direction. A planetary continuously variable transmission characterized in that a planetary gear that constitutes a gear mechanism is a two-stage planetary gear, and each planetary gear is connected by a one-way clutch.