JPS61286650A - Gear type transmission - Google Patents

Abstract

PURPOSE:To obtain a number of speed change stages without increasing the total length of the apparatus by installing a sub-speed change part which permits the switching between the high and low speed by a plurality of clutches and gear trains onto the output side of a main speed change part. CONSTITUTION:A transmission 1 is equipped with a main speed change part 2 and a sub-speed change part 3. The main speed change part 2 is equipped with an input shaft 4 as main input shaft, the first main shaft 5 coaxially arranged with the input shaft 4, the second tubular main shaft 6 arranged outside the first main shaft 5, and a countershaft 7 which is arranged in parallel to the first and the second main shafts 5 and 6 and acts as output shaft. Further, the sub-speed change part 3 is equipped with an input shaft 21 connected to the countershaft 7, and an output shaft 22 which is arranged in parallel to the input shaft 21 and coaxially arranged with the first and the second main shafts 5 and 6 and acts as main output shaft. Further, the sub-speed change part 3 is equipped with a clutch 27 for high speed stage, one-way clutch 28 for low speed stage and a clutch 29 for engine brake.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transmission, and more particularly to a gear type transmission.

(Prior art) As the above type of transmission device, for example, Japanese Patent Laid-Open No. 57-17
3638, each gear train being one of a set providing a series of increasing speed ratios;
and two clutches that can be operated independently and configure separate drive power transmission paths via the gear train between a common input shaft and a common output shaft, A rotation transmission device is known that has a double clutch, which is a transmission device in which a gear train providing separate speed ratios is driven via one clutch and the other clutch, respectively.

(Problems to be Solved by the Invention) The above-mentioned gear type transmission has a relatively simple structure and can change multiple gears.
There may be cases where it is necessary to increase the number of gears.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a gear type transmission that can provide a large number of gears with a relatively simple structure.

(Means for Solving the Problems) The gear type transmission of the present invention includes a main input shaft, a main transmission section connected to the main input shaft, a sub-transmission section connected to the main transmission section, a main output shaft connected to the sub-transmission section, the main transmission section having a plurality of clutches that are each operated independently, and transmitting the rotation of the main output shaft by the operating clutches. The main transmission section also includes a rotation transmission device including a plurality of forward gear trains and reverse gear trains having different gear ratios, and a meshing device for selectively connecting these gear trains. and outputs the rotation of the operating clutch to the auxiliary transmission section via a gear train connected by the meshing device,
The auxiliary transmission section has a plurality of clutches that are each operated independently, and transmits rotation from the main transmission section by the operating clutches, and the auxiliary transmission section also has a plurality of clutches that are operated independently. The present invention is characterized in that it includes a rotating device that outputs output to the main output shaft at high and low gear ratios via a rotating gear train of the output shaft of the clutch that is in operation.

(Operations and Effects of the Invention) In the gear type transmission according to the present invention having the above-described structure, a plurality of clutches and a gear train are provided on the output side of the main transmission section equipped with a plurality of clutches that operate independently for high and low speeds. Since the auxiliary transmission section is provided that can switch between the two, a large number of gears can be obtained without significantly increasing the overall length of the device.

(Example) Hereinafter, a gear type transmission according to a preferred example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a gear type transmission 1 according to a first embodiment of the present invention.

As can be seen from FIG. 1, the transmission 1 includes a main transmission section 2 and a sub-transmission section 3. The main transmission section 2 includes an input shaft 4 that is connected to an engine output shaft (not shown) and acts as a main input shaft, a first main shaft 5 disposed coaxially with the human power shaft 4, and a first main shaft 5 disposed outside the first main shaft 5. A second tubular main shaft 6 is provided, and a countershaft 7 is arranged parallel to the first and second main shafts 5.6 and acts as an output shaft. The input shaft 4 and the first and second main shafts 5
．． 6, the human power shaft 4 is connected to the first and second shafts, respectively.
First and second clutches 8.9 are provided in parallel for connection to either one of the main shafts 5.6. This clutch 8.9 is preferably constructed as a friction clutch.

A first gear 10 having a relatively large diameter and a second gear 11 having a relatively small diameter are fixed to the first main shaft 5.

Further, a third gear 12 having a larger diameter than the first gear 10 and a fourth gear 13 having a smaller diameter than the first gear 10 are fixed to the second main shaft 6. On the other hand, the countershaft 7 is provided with the first, third and fourth gears 1.
Fifth, sixth and seventh gear wheels 14.15.16 are rotatably mounted to said shaft 7, each directly meshing with a gear wheel 7.0.12.13. An eighth gear 18 that meshes with the second gear 11 via an intermediate gear 17 is further fixed to the countershaft 7 . The fourth gear 13 and the seventh gear 16 form a first gear train G, and the first gear 10 and the fifth gear 14 form a second gear train G2.
The third gear train G is formed by the third gear 12 and the sixth gear 15,
The second and eighth gears 11 and 18 and the intermediate gear 17 constitute a fourth gear train G, respectively.

The countershaft 7 and the fifth and eighth gears 14
．． A first synchronizer 19 is disposed between the gears 18 and 18 for connecting the countershaft 7 to either one of the fifth and eighth gears 14,18. Further, the countershaft 7 and the sixth and seventh gears 15.1
60, a second gear for connecting the countershaft 7 to either one of the sixth and seventh gears 15, 16.
A synchronizer 20 is arranged.

The sub-transmission section 3 includes an input shaft 21 connected to the countershaft 7, and an output shaft 22 parallel to the input shaft 21 and coaxial with the first and second main shafts 5.6.
It is equipped with This output shaft 22 acts as the output shaft of the entire device, that is, the main output shaft. The input shaft 21 includes
A ninth gear 23 having a relatively large diameter and a tenth gear 24 having a relatively small diameter are fixed. On the other hand, the output shaft 2
2, 11th and 12th gears 25.26 meshing with the 9th and 10th gears 23.24, respectively, are connected to the shaft 22.
It is rotatably provided with respect to. The ninth gear 23
The 11th gear 25 and the 11th gear 25 constitute a high-speed gear train G□, and the 10th gear 24 and the 12th gear 26 constitute a low-speed gear train GL. A third clutch 27 is provided between the output shaft 22 and the eleventh gear 25.
The output shaft 22 is selectively connected to and connected to the eleventh gear 25 by the clutch 27. On the other hand, a one-way clutch 28 is provided between the twelfth gear 26 and the output shaft 22.

This one-way clutch 28 is connected to the third clutch 27
is in an inoperative state, the twelfth gear 26 is connected to the output shaft 22.
When the third clutch 27 is in the operating state, the twelfth gear 26 and the output shaft 22 are disconnected from each other. Therefore, the third clutch 27 acts as a high-speed clutch, and the one-way clutch 28 acts as a low-speed clutch. In addition, the 12th
It is desirable to provide a clutch 29 for engine braking between the gear 26 and the output shaft 22.

With the above configuration, the present transmission device 1 can obtain six forward speeds and one reverse speed. Next, the power transmission state at each gear stage of the transmission 1 will be explained with reference to the clutch operation table below.

In the above table, "C1" and "C2" in the column of the operating clutch of the main transmission section respectively refer to the first clutch 8.
and the second clutch 9, "high" in the operating clutch column and operating gear train column of the auxiliary transmission section indicates the third clutch 27 and the high speed gear GH, and "low" indicates the one-way clutch 28 and the low speed gear train. A gear GL is shown.

First, in the first speed, the second clutch 9 (C2) is connected and the third clutch 27 is released, so the one-way clutch 28 is connected, and the second synchronizer 20 connects the countershaft 7 to the first Gear train G1
are connected. In this state, the rotation of the human power shaft 4 is transmitted to the input shaft 21 of the auxiliary transmission section 3 while being largely decelerated by the first gear train G1, and this rotation is again decelerated by the low gear train GL. Since the signal is transmitted to the output shaft 22, which is the main output shaft, a first speed state with a large reduction ratio can be obtained.

Next, when shifting from the first speed to the second speed, the third clutch 27 of the sub-transmission section 3, that is, the high-speed clutch is connected, and at the same time, the one-way clutch 28 is automatically released. Then, the rotation of the human power shaft 21 is increased in speed by the high speed gear train GH and transmitted to the output shaft 22. At this time, the power transmission state of the main transmission section 2 is the same as in the case of the first speed, but by increasing the speed of the gear train GH, a second speed state with a smaller reduction ratio than the first speed is obtained.

In the same manner as described above, by sequentially setting the operating clutches and operating gear trains of the main transmission section 2 and the sub-transmission section 3 based on the above table, the third to sixth speeds with sequentially smaller reduction ratios can be obtained. Further, the operating clutch of the main transmission section 2 is C1, the operating gear train is G, the operating clutch of the auxiliary transmission section 3 is the one-way clutch 28, and the operating gear train is the low gear GL.
If so, you will get reverse gear.

The selective operation of the three clutches 8.9.27 and the synchronizer 19.20 is preferably controlled by an electronically controlled hydraulic control device.

Next, a gear type transmission 30 according to a second embodiment of the present invention will be described with reference to FIG.

Also in this gear type transmission 30, the structure of the main transmission part is the same as that of the gear type transmission 1 of the first embodiment.
The same reference numerals as in the first embodiment are used to omit the explanation.

The transmission 30 has a sub-transmission section 31 , and the sub-transmission section 31 includes a first main shaft 32 which is a human power shaft connected to the counter shaft 7 of the main transmission section 2 , and an outer side of the first main shaft 32 . a tubular second main shaft 33 disposed in the first main shaft 32;
a sub-shaft 34 arranged parallel to the first main shaft 32;
It has an output shaft 35 disposed coaxially with. 1st above
A ninth gear 36 is mounted on the main shaft 32, and a tenth gear is mounted on the second main shaft 33.
Teeth 37 are each fixed. The subshaft 34 has
An 11th gear 38 and a 12th gear 39 are fixedly engaged with the 9th and 10th gears 36 and 37, respectively. The ninth gear 36 is smaller than the eleventh gear 38, and the tenth gear 37 is larger than the twelfth gear 39, so these four gears 36, 37, 38, 39 constitute a reduction gear train G1.

The output shaft 35 is connected to the first output shaft via a third clutch 40.
The third clutch 4 is directly connected to the main shaft 32 or released directly from the main shaft 32.
One-way clutch 41 that is connected when 0 is released
It is connected to the second main shaft 33 or released from this connection. In this sub-transmission section 31, a high speed gear is achieved by directly connecting the first main shaft 32 and the output shaft 35, and a low speed gear is achieved by connecting the first main shaft 32 through a reduction gear train G01, a second main shaft 33, and a one-way clutch 41. This is achieved by connecting the output shaft 35 to the output shaft 35. In addition, in FIG. 2, the reference numeral 42 is a clutch for engine braking.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a gear type transmission according to a first embodiment of the present invention, and FIG. 2 is a schematic diagram of a gear type transmission according to a second embodiment of the present invention. 1...Gear type transmission, 2...Main transmission section, 3...Sub-transmission section, 4...Human power shaft,
7...Countershaft, 8...1st
Clutch, 9...Second clutch, 19.20...Synchronizer, 21...
...Input shaft, 22...Output shaft, 28...
・One-way clutch, 27...Third clutch.

Claims (1)

[Claims] The main transmission section includes a main input shaft, a main transmission section connected to the main input shaft, an auxiliary transmission section connected to the main transmission section, and a main output shaft connected to the auxiliary transmission section. has a plurality of clutches, each of which is operated independently, and the rotation of the main output shaft is transmitted by the operating clutch, and the main transmission section also has a plurality of clutches with different gear ratios. A rotation transmission device includes a forward gear train, a reverse gear train, and a meshing device that selectively connects these gear trains, and the rotation of the operating clutch is transmitted to the gear connected by the meshing device. The output is transmitted to the auxiliary transmission section via a gear train, and the auxiliary transmission section has a plurality of clutches that are each operated independently, and the operating clutches output the output from the main transmission section. The auxiliary transmission unit also transmits the rotation of the output shaft of the operating clutch to the main output shaft at high and low gear ratios through a gear train. A gear transmission with a device.