JPS61290264A - Automatic four-stage speed change gear mechanism - Google Patents

Abstract

PURPOSE:To improve the durability of the captioned mechanism and to miniaturize the whole size thereof by interconnecting the ring gear of the first planetary gear set to an input shaft at the time of the first speed stage so as to lower tangential force. CONSTITUTION:The ring gear of the first planetary gear set P11 is connected to an input shaft 1 through a clutch 11 while the sun gear of the planetary gear set P11 through a clutch 12. Further, the carrier of the second planetary gear set P12 is connected to the input shaft 1 through the clutch 12 and a clutch 14. The other side, the carrier of the first planetary gear set P11 and the ring gear of the second planetary gear set P12 are connected to an output shaft <O>. Thus, since the ring gear is connected to an input shaft at the time of the first speed, tangential force becomes lower and thereby it is possible to miniaturize the size of bearings and gears.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a four-speed automatic transmission mechanism that performs four-speed automatic transmission using two planetary gear sets.

[Conventional technology]

Fig. 6 is a diagram for explaining a conventional 4-speed automatic transmission mechanism using a 2MI planetary gear set, in which B61 and 862 are brakes, C61 to C63 are clutches, and P
61 and P62 are planetary gear sets, ■ is an input shaft, and 0 is an output shaft.

The usual configuration was to use two planetary gear sets to automatically shift three forward speeds, but in recent years, four-speed automatic transmissions using two planetary gear sets to automatically shift four forward speeds has been introduced.
An automatic transmission mechanism has been proposed and is attracting attention. FIG. 6 shows one example. In the 4-speed automatic transmission mechanism shown in FIG. 6, the input shaft ■ is connected to the clutch C
61 to the sun gear of the second planetary gear set P62, via the clutch C62 to the carrier of the first planetary gear set P61 and the ring gear of the second planetary gear set P62, and via the clutch C63 to the first
The first planetary gear set P61 is connected to the sun gear of the first planetary gear set P61.
A brake B61 is connected to the sun gear of the first planetary gear set P61, and a brake B62 is connected to the carrier of the first planetary gear set P61 and the ring gear of the second planetary gear set P62.
The carrier of the planetary gear set P62 is connected to the output shaft 0.

In the above-mentioned four-speed automatic transmission mechanism, each gear is connected and fixed as follows, for example, to realize four-speed automatic transmission. In 1st speed, a clutch C61 connects the input shaft and the sun gear of the second planetary gear set P62, and a brake B62 connects the ring gear of the second planetary gear set P62 and the first planetary gear set P
61 carrier is fixed. For the second speed, from this L speed state, the brake B62 is released and the sun gear of the first planetary gear set P61 is fixed by the brake B61,
For 3rd speed, from this 2nd speed state, the brake B61 is released and the clutch C62 is used to shift the first planetary gear set P.
61 is also connected to the input shaft I, and in the fourth gear, the clutch C61 is disengaged and the brake B61 is used to fix the first gear of the first planetary gear set P61.

[Problem that the invention seeks to solve]

As described above, the conventional four-speed automatic transmission mechanism using two planetary gear sets is configured to input power from the sun gear, so the tangential force of the gears becomes large.

In particular, since power is input from the sun gear at the l speed, which requires the most power, problems arise in that durability deteriorates and the structure has to be increased in size.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a four-speed automatic transmission mechanism that has improved durability and can be made more compact.

[Means for solving problems]

To this end, the 4-speed automatic transmission mechanism of the present invention has a first planetary gear set and a second planetary gear set each consisting of a ring gear, a carrier, and a sun gear, and uses a clutch, a one-way clutch, and a brake to connect each element. A 4-speed automatic that connects to the human power shaft, connects and fixes each element, and connects the carrier of the first planetary gear set and the ring gear of the second planetary gear set to the output shaft to achieve 4-speed automatic shifting. The transmission mechanism is configured to connect the ring gear of the first planetary gear set to the human power shaft and connect the sun gear of the first planetary gear set to the sun gear of the second planetary gear set when at least the first speed is set, and the second gear when the fourth speed is set. The present invention is characterized in that the carrier of the planetary gear set is configured to be connected to the input shaft.

[Action and effect of invention]

In the 4-speed automatic transmission mechanism of the present invention, since the ring gear of the first planetary gear set is connected to the input shaft at l-speed, the tangential force can be reduced, and durability and the overall mechanism can be made more compact. Furthermore, four speeds are achieved by connecting the carrier of the second planetary gear set to the input shaft.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the 4-speed automatic transmission mechanism according to the present invention, FIG. 2 is a diagram for explaining the operation of the 4-speed automatic transmission mechanism shown in FIG. 1, and FIG. FIG. 4 is a diagram showing the configuration of a second embodiment of the 4-speed automatic transmission mechanism according to the invention; FIG. 4 is a diagram illustrating the configuration of the third embodiment of the 4-speed automatic transmission mechanism according to the invention;
FIG. 5 is a diagram showing another embodiment configuration in which the input section of the 4-speed automatic transmission mechanism shown in FIGS. 1 to 4 is modified. In FIG. 0, B11, B12, B31, B32, B41 and B42 are Brake, C1l to C14, C31 to C34 and C41 to C44 are clutches, Fll, B12, B3
1. B32, B41 and B42 are one-way clutches, p
H, B12, B31° B32, B41 and B42 are planetary gear sets, ■ indicates the input shaft, and 0 indicates the output shaft.

The 4-speed automatic transmission mechanism according to the present invention shown in FIG. 1 has an input shaft! The ring gear of the first planetary gear set pH is connected via the clutch C1l, and the first planetary gear set pH is connected via the clutch C12 to the ring gear of the first planetary gear set pH.
Sun gear, and clutch C12 and clutch C14
via which the carrier of the second planetary gear set P12 is connected. On the other hand, the carrier of the first planetary gear set pH and the ring gear of the second planetary gear set P12 are connected to the output shaft 0. and,
The first planetary gear set PTTO sun gear and the sun gear of the second planetary gear set P12 are connected through a parallel circuit of the clutch C13 and the one-way clutch gear 11, and the brake Bll is connected to the sun gear of the second planetary gear set P12. , a one-way clutch F1 is attached to the carrier of the second planetary gear set P12.
2 and brake B12 are connected in parallel circuit.

FIG. 2 is an explanatory diagram of the operation of the four-speed automatic transmission mechanism. In the first speed, the carrier of the second planetary gear set P12 is fixed by the one-way clutch F12 by engaging the clutch C1l and inputting the ring gear of the first planetary gear set pH, and
The sun gear of the first planetary gear set pH and the sun gear of the second planetary gear set PL2 are connected by a one-way clutch Fil. On the other hand, in the second speed, the clutch C14 is further engaged to fix the sun gear of the first planetary gear set pH. At this time, the one-way clutch Fil becomes free. In the third speed, the clutch C12 is further engaged, the sun gear of the first planetary gear set pH is also input, and the first planetary gear set pH rotates as a unit. At this time, since the clutch C14 is engaged, the second planetary gear set P12 is also integrated, and the one-way clutch F12
becomes free, and the one-way clutch Fil rotates synchronously. In 4th gear, before engaging the brake Bll, the clutch C1l is released and the carrier of the second planetary gear set P12 is used as an input, and the one-way clutch Fil is locked (in this state, the 3-brake B) is activated.
By engaging P11 and fixing the sun gear of the second planetary gear set P12, the input rotation is accelerated and output. To move backward, the clutches C12 and C13 are engaged, the sun gear of the second planetary gear set P12 is input, and the carrier of the second planetary gear set P12 is fixed by the brake B12. The dotted line O in Figure 2 indicates that the engine brake is engaged when necessary, and Δ
indicates that the one-way clutch is synchronized. In this way, in the 4-speed automatic transmission mechanism of the present invention, the clutch C1l
connects the input shaft to the ring gear of the first planetary gear set pH in l, 2, and 3 speeds, and
The input from the ring gear of the planetary gear set pH is 0. For example, in FIG.
If you do not use clutch C13, it is necessary to engage clutch C13 during 1st gear, and clutch C1 must be engaged when converting from 1st gear to 2nd gear.
3 is released and clutch C14 is engaged, but if the timing is off and clutch C13 is released early, - instantaneous clutch C13 and clutch C14 are released at the same time, causing a so-called racing phenomenon, and conversely, clutch C13 is released slowly. In some cases, when they are engaged, latch CI3 and clutch C14 are momentarily engaged simultaneously, causing a shock. In this way, delicate timing is required to switch the clutch or brake, but the operation of this clutch or brake Because it uses hydraulic pressure, the viscosity of the pressure oil changes depending on the temperature, making it difficult to obtain the desired timing in all ranges.In other words, it is necessary to install one one-way clutch for each gear shift or crunchy crunch (no one-way clutch). However, clutch-clutch systems have problems in terms of durability and shock, while one-way clutches have problems in terms of cost and compactness. Therefore, one one-way clutch Fil connects the first planetary gear set PHO sun gear and the second planetary gear set P1.
The other one-way clutch F12 is disposed on the carrier of the second planetary gear set P12. Then, using two one-way clutches Fil and PI2, 1st to 2nd gear and 2nd to 3rd gear are used.
When shifting from 3rd gear to 4th gear, one of the one-way clutches Fil and PI2 is operated from locked to free, so that all gear changes are performed via the one-way clutch. As described above, the 4-speed automatic transmission mechanism of the present invention is configured to shift using a one-way clutch in each stage using the minimum number of one-way clutches,
Clutch - This improves durability and prevents shock compared to shifting with a clutch.

Figure 3 shows a second embodiment of the present invention in which the same gear train as in Figure 1 has two planetary gear sets arranged at the rear, and the output shaft is connected from the middle of the two planetary gear sets. FIG. 4 shows a third embodiment of the present invention. Furthermore, compared to these FIGS. 1, 3, and 4, FIG. 5 shows an example in which the input shaft is directly connected to the ring gear of one planetary gear set, and FIG. 1 shows a modification of the part to the left of l in FIG.
FIG. 5 (01 shows a modification of the portion to the left of l in FIG. 4.

As is clear from the above explanation, according to the present invention, the tangential force is small (at first speed, the ring gear is manually powered, so the tangential force is small, so the bearings and gears are advantageous in terms of capacity, and the gear width is reduced. In addition, the 4-speed automatic transmission mechanism of the present invention reduces the number of one-way clutches and uses a one-way clutch for each stage to shift, so compared to a clutch-clutch configuration. It also reduces shock and allows for compactness.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the 4-speed automatic transmission mechanism according to the present invention, FIG. 2 is a diagram for explaining the operation of the 4-speed automatic transmission mechanism shown in FIG. 1, and FIG. FIG. 4 is a diagram showing the configuration of a second embodiment of the 4-speed automatic transmission mechanism according to the invention; FIG. 4 is a diagram illustrating the configuration of the third embodiment of the 4-speed automatic transmission mechanism according to the invention;
FIG. 5 is a diagram showing another embodiment configuration in which the input section of the 4-speed automatic transmission mechanism shown in FIGS. 1 to 4 is modified, and FIG.
FIG. 2 is a diagram for explaining a conventional 4-speed automatic transmission mechanism using two planetary gear sets. B11. B12, B31, B32, B41. B42,B
61 and B62...Brake, C1l or C14, C
31 to C34, C41 to C44 and 061 to C63...Clutch, Fil, PI2, F31%F3
2.F41 and Pd2...one-way clutch, Pll
, PI3, P31P32, Pd2, Pd2, P61 and P
62... Planetary gear set, r... Input shaft, O... Output shaft. Patent Applicant: Aisin Works Co., Ltd. Agent: Patent Attorney Ryukichi Abe Figure 1 Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) It has a first planetary gear set and a second planetary gear set consisting of each element of a ring gear, carrier, and sun gear, and uses a clutch, one-way clutch, and brake to connect each element to the input shaft and between each element. A four-speed automatic transmission mechanism that realizes four-speed automatic transmission by connecting and fixing a carrier of a first planetary gear set and a ring gear of a second planetary gear set to an output shaft, the mechanism comprising at least one speed At times, the ring gear of the first planetary gear set is connected to the input shaft, and the sun gear of the first planetary gear set and the sun gear of the second planetary gear set are connected, and at the time of 4th speed, the carrier of the second planetary gear set is connected to the input shaft. A four-speed automatic transmission mechanism characterized by being configured to. (2) The sun gear of the first planetary gear set and the sun gear of the second planetary gear set are connected via a one-way clutch, and the carrier of the second planetary gear set is connected to the stationary side via the one-way clutch. A four-speed self-help transmission mechanism according to claim 1, characterized in that: (3) When switching from 1st gear to 2nd gear, at least one one-way clutch is switched from lock to free; when switching from 2nd gear to 3rd gear, the other one-way clutch is switched from lock to free, and from 3rd gear to 4 4. The four-speed automatic transmission mechanism according to claim 1, wherein one of the one-way clutches is switched from a locked state to a free state when switching to a high speed.