JP3579851B2 - Two forward speeds, one reverse speed, constant mesh transmission - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a constant mesh transmission capable of changing the rotation of power to two forward stages and one reverse stage.
[0002]
[Prior art]
As a conventional apparatus of this kind, there are those described in Japanese Utility Model Publication No. 46-18756 and Japanese Patent Application Laid-Open No. 59-110947. In these devices, the transmission from the input shaft to the output shaft is changed in three stages in the direction of the input shaft by a constantly meshing gear train, and by changing the transmission route arranged in the axial direction between these gear trains. And two or more clutches.
[0003]
[Problems to be solved by the invention]
However, as described above, in a device having a gear train having three stages and a clutch having two or more stages, there is a problem that the length in the direction of the input shaft is inevitably increased.
[0004]
On the other hand, as a request from a vehicle equipped with a transmission, a reduction in size, particularly a reduction in thickness in the direction of the input shaft and a reduction in weight are demanded in order to reduce an occupied area and improve fuel efficiency.
[0005]
According to the present invention, in response to such a request from the vehicle side, the length in the input shaft direction can be remarkably shortened to reduce the size, particularly the thickness and the weight, and to reduce the cost. It is an object of the present invention to provide a continuously meshing transmission having two forward stages and one reverse stage.
[0006]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) An input shaft, a first intermediate shaft, a second intermediate shaft, and an output shaft are disposed in parallel with each other, and an input gear fixed to the input shaft and a first drive gear fixed to the first intermediate shaft. A second drive gear fixedly fitted to the second intermediate shaft is linked to each other in a plane perpendicular to the input shaft to form a drive gear train, and a main driven gear pivotally fitted to the input shaft and the first intermediate gear are connected to the first intermediate shaft. The first driven gear that is pivotally fitted and the second driven gear that is pivotally fitted to the second intermediate shaft are linked to each other in a plane orthogonal to the input shaft to form a driven gear train, and the input shaft and the first intermediate shaft And a second intermediate shaft, between the gear on the side of the drive gear train and the gear on the side of the driven gear train, a clutch is provided for interrupting the connection between the opposing gears, and the input gear and the first drive gear or Between the second driving gear or between the main driven gear and the first driven gear or the second driven gear In between, a reversing gear for reversing the rotation direction is provided, and an output gear fixedly fitted to the output shaft meshes with one of the gears on the driven gear train side.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a front view schematically showing the basic configuration of a forward two-stage reverse one-stage constant mesh transmission of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG.
[0008]
This transmission is used for a vehicle, for example, and as is apparent from the specific embodiments shown in FIGS. 3 to 5, the transmission is combined with a torque converter (1) to supply power from an engine (not shown). The rotational driving force applied to the rotating shaft (2) is input to the input shaft (3) of the transmission via the torque converter (1), and the output of the transmission is extracted from the output shaft (4). It has become.
[0009]
A key feature of the present invention is to reduce the length (L1) of this transmission to minimize the overall length (L2) of the device combined with the torque converter (1), and thereby achieve miniaturization. Is the purpose.
[0010]
Returning to FIGS. 1 and 2 showing the basic configuration of the present invention, the description will be continued. As shown in FIG. 1, the input shaft (3), the first intermediate shaft (5), and the second intermediate shaft (6). Are arranged in parallel with each other, with the input shaft (3) as the center, the first intermediate shaft (5) on the right side, and the second intermediate shaft (6) on the left side. An output shaft (4) is disposed below and to the left of the input shaft (3), and a third intermediate shaft (7) is disposed below and to the upper left of the input shaft (3) so as to be parallel to the input shaft (3). I have.
[0011]
As shown in FIG. 2, an input gear (8) is fixedly fitted to the input shaft (3) (in this specification, “fixed fitting” means that the input gear (8) cannot rotate relative to the shaft. ).
[0012]
A first drive gear (9) fixedly fitted to the first intermediate shaft (5) and a reversing gear (10) fixedly fitted to the third intermediate shaft (7) mesh with the input gear (8). The reversing gear (10) further meshes with a second drive gear (11) fixedly fitted to the second intermediate shaft (6).
[0013]
In this way, the input gear (8), the first drive gear (9), the reversing gear (10), and the second drive gear (11) are arranged in a drive gear train ( 12).
[0014]
On the other hand, a main driven gear (13) is pivotally fitted to the input shaft (3) ("pivot fitting" in this specification means that the input shaft (3) is mounted so as to be rotatable relative to the shaft. Shall be).
[0015]
The main driven gear (13) includes a first driven gear (14) pivotally fitted to the first intermediate shaft (5) and a second driven gear (15) pivotally fitted to the second intermediate shaft (6). Are engaged.
[0016]
Further, the main driven gear (13) also meshes with an output gear (16) fixedly fitted to the output shaft (4). This relationship cannot be shown in the cross section of FIG. 2, but is clear from FIG.
[0017]
The main driven gear (13), the first and second driven gears (14) and (15), and the output gear (16) form a driven gear train (17) arranged in a plane orthogonal to the input shaft (3). are doing.
[0018]
Similarly, between the drive gear train (12) and the driven gear train (17), a clutch train (18) is formed on a plane orthogonal to each axis.
[0019]
That is, between the input gear (8) of the input shaft (3) and the main driven gear (13), one end is fixedly fitted to the input shaft (3), and the other end is a boss of the main driven gear (13). One end is provided between the first drive gear (9) of the first intermediate shaft (5) and the first driven gear (14) with the clutch (19) for the second (F2) fixed to the portion. A first (F1) clutch (20) fixedly fitted to the first intermediate shaft (5) and having the other end fixed to the boss portion of the first driven gear (14) further includes a second intermediate shaft (6). ) Between the second drive gear (11) and the second driven gear (15), one end is fixedly fitted to the second intermediate shaft (5), and the other end is a boss of the second driven gear (15). A reverse (R) clutch (21) fixed to the portion is provided.
[0020]
Next, the operation of this transmission will be described.
First, when the clutch (20) is engaged, power from the input shaft (3) is supplied from the input gear (8) and the first drive gear (9) via the clutch (20) to the first driven gear (14). To the main driven gear (13) and the output gear (16) to drive the output shaft (4). This is the first (F1) meshing state.
[0021]
When the clutch (19) is engaged, the power from the input shaft (3) is transmitted directly to the main driven gear (13) and the output gear (16) via the clutch (19) to drive the output shaft (4). I do. This is a meshing state of the second (F2).
[0022]
When the clutch (21) is engaged, power from the input shaft (3) is transmitted from the input gear (8), the reversing gear (10), and the second drive gear (11) via the clutch (21) to the second gear. It is transmitted to the driven gear (15), the main driven gear (13), and the output gear (16) to drive the output shaft (4). This is a reverse (R) meshing state.
[0023]
In the specific embodiment shown in FIG. 5, the cross section is shown differently from the cross section shown in FIG. 2, and the diameter of each shaft, the shape of each gear, and the like are different. It is of a configuration.
As is apparent from these figures, the transmission has only three rows of the drive gear row (12), the driven gear row (17), and the clutch row (18), and therefore, the direction of the input shaft (3). Can be made the shortest (L1).
[0024]
The reversing gear (10) is provided not only between the input gear (8) and the second drive gear (11) but also between the input gear (8) and the second drive gear (11), The output gear (16) may be disposed between the moving gear (13) and the first driven gear (14) or the second driven gear (15). Gear may be meshed.
[0025]
【The invention's effect】
According to the present invention, the gear train that conventionally required three rows and the clutch row that required two or more rows are composed of only two gear rows and one clutch row, so that the length in the input shaft direction is long. Can be as short as possible.
[0026]
In addition, by adopting such a three-row configuration, it is possible to provide a transmission that achieves downsizing, reduces the number of parts and weight, and is inexpensive.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a basic configuration of a forward two-stage reverse one-stage constant mesh transmission of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of FIG.
FIG. 3 is a side view of a specific embodiment of the present invention in combination with a torque converter.
FIG. 4 is a rear view of the device shown in FIG. 3;
FIG. 5 is a sectional view taken along the line VV of FIG. 4;
[Explanation of symbols]
(1) Torque converter (2) Rotary shaft (3) Input shaft (4) Output shaft (5) First intermediate shaft (6) Second intermediate shaft (7) Third intermediate shaft (8) Input gear (9) 1 drive gear (10) reverse gear (11) second drive gear (12) drive gear train (13) main driven gear (14) first driven gear (15) second driven gear (16) output gear (17) driven Gear train (18) Clutch train (19) Second (F2) clutch (20) First (F1) clutch (21) Reverse (R) clutch (L1) Transmission length (L2) Overall device Length of

Claims (1)

An input shaft, a first intermediate shaft, a second intermediate shaft, and an output shaft are arranged in parallel with each other, and an input gear fixed to the input shaft, a first drive gear fixed to the first intermediate shaft, and a second intermediate shaft. The second drive gear fixedly fitted to the shaft is linked to each other in a plane perpendicular to the input shaft to form a drive gear train, and the main driven gear pivotally fitted to the input shaft and the first intermediate shaft pivotally fitted to the first intermediate shaft. The first driven gear and the second driven gear pivotally fitted on the second intermediate shaft are linked to each other in a plane orthogonal to the input shaft to form a driven gear train, and the input shaft, the first intermediate shaft and the second A clutch is provided between the gear on the side of the drive gear train and the gear on the side of the driven gear train with respect to the intermediate shaft, and a clutch for intermittently linking the opposing gears is provided, and the input gear and the first drive gear or the second drive gear are provided. Between the gears, or between the main driven gear and the first or second driven gear, A two-stage forward-reversing one-stage constant mesh transmission in which a reversing gear for reversing the direction of rotation is provided, and an output gear fixedly fitted to an output shaft is meshed with one of the gears on the driven gear train side. .

Images