JPH0640999Y2 - Power shift transmission for forward and reverse 3rd speed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a power shift transmission capable of switching between forward and reverse speeds and is used mainly for construction machines and vehicles.

(Prior Art) In a power shift transmission that shifts between forward and backward 3rd speed by engaging and disengaging a clutch, the number of clutches required is 2 for switching between forward and reverse, and for switching between 3 speeds. In order to do this, there will be 3 units, for a total of 5 units. By fitting these clutches, gears having a gear ratio that gives each gear are meshed with each other to transmit the required gear. Regarding the number of meshes of the gears, there is a difference in that one is an even number and the other is an odd number in transmission between forward and reverse. Therefore, the minimum required number of gears for the power shift transmission in the third speed is 11 in both forward and reverse. Also, the required number of shafts is five for all clutches, so if one clutch is provided with up to two clutches, three shafts for the clutches
Furthermore, since one shaft is separately required for switching between forward and reverse, a total of four shafts are required. FIGS. 3 and 4 show a conventional example constructed based on this condition. FIG. 3 is a sectional view taken along the line IV-IV in the axial direction of FIG. 4 and FIG. 4 is a longitudinal sectional view. In FIG. 3, the forward clutch 1 and the reverse clutch 2 are separately provided on the forward shaft 3 and the reverse shaft 4, respectively, and the gears 6 integrated with the input shaft 5 are respectively provided on the input side gears 7 of the forward and reverse clutches 1 and 2. , 8 are configured to be simultaneously input. The first speed clutch 9 is provided integrally with the reverse clutch 2 on the reverse shaft 4, and the rotation of the first forward speed is performed from the forward clutch 1 through the gears 10, 11, the first speed clutch 9, the gears 12, 13, 14 ,. The output shaft 16 is passed through even-numbered meshes at four points (indicates the number of meshes from the input shaft 5 to the output shaft 16 and is the same in the following description) such as 15.
Further, the reverse first speed is transmitted from the reverse clutch 2 to the output shaft 16 through three odd meshes such as the first speed clutch 9, which is coaxial therewith, and the gears 12, 13, 14 and 15. Next,
The second speed clutch 17 is provided integrally with the forward clutch 1 on the forward shaft 3, and the rotation of the second forward speed is performed at two positions such as the second speed clutch 17 coaxial with the forward clutch 1 and the gears 14 and 15. To the output shaft 16 through the even meshing of the gears, and the second reverse speed is from the reverse clutch 2 to the gears 11, 10, the second speed Kutch 17, the gears 14,
As shown in FIG. 15, it is transmitted to the output shaft 16 through three odd-numbered meshes. Further, the third speed clutch 18 is provided on the output shaft 16, and the rotation of the third forward speed is performed from the forward clutch 1 to the gears 19, 20.
As in the case of the third-speed clutch 18, the output shaft 16 is passed through even-numbered meshes at two places, and the reverse third-speed rotation is performed by the reverse clutch 2
To gears 11, 10, 19, 20 and 3 like 3rd speed clutch 18
It is transmitted to the output shaft 14 through an odd number of meshing points.

(Problems to be Solved by the Invention) As described above, the input shaft 5 is integrally provided with the forward clutch 1 and the reverse clutch 2 with the gear 6 for applying the input rotation. It is indispensable for giving a mechanism. However, it is clear from FIG. 4 that the input shaft 5 occupies a large space for accommodating the large-diameter gear 6 in the housing.
Therefore, if the input shaft required to provide the reversing mechanism can be omitted without increasing the number of gears, the total number of shafts is three, and the housing is compact and contributes to cost reduction. This is the purpose of the present invention.

(Means for Solving the Problem) In order to achieve the above object, the present invention has an input shaft, an intermediate shaft, and an output shaft, and a forward clutch and a reverse clutch are provided on the input shaft, as shown in FIG. Each input side is integrally connected to the input shaft, and the intermediate shaft is provided with a first speed clutch and a third speed clutch, which are integrally connected to the intermediate shaft at each input side,
In the power shift transmission of the forward / reverse 3rd speed, in which the output shaft is provided with the 2nd speed clutch by integrally coupling the output side with the output shaft, the "forward clutch (24) output shaft (33)"
The gear (41) integrated with the gear (42) integrated with the intermediate shaft (22)
Geared to the intermediate shaft (22) through a reversing gear (44) that rotatably supports the output shaft (23) with a gear (43) that is integral with the output shaft (34) of the reverse clutch (25). Mesh with the gear (45) of the first speed clutch (26) and the gear (52) integrated with the output shaft (50) of the first speed clutch (26) with the gear (54) integrated with the output shaft (23).
A gear (5) integrated with the output shaft (51) of the third speed clutch (27)
3) meshes with the gear (55) integrated with the output shaft (23) and the gear (59) integrated with the intermediate shaft (22) with the input shaft (57) of the second speed clutch (28). 58) ”.

(Embodiment) FIGS. 1 and 2 show a simple structure of a power shift transmission of the present invention. FIG. 1 is a sectional view taken along the line II-II in the axial direction of FIG. 2 and FIG. 2 is a longitudinal sectional view. Is. In FIG. 1, 21 is an input shaft, 22 is an intermediate shaft, and 23 is an output shaft.
The input shaft 5 as shown in FIG. 3 is not included. The input shaft 21 has a forward clutch 24 and a reverse clutch 25, the intermediate shaft 22 has a first speed clutch 26 and a third speed clutch 27, and a clutch carrier is integrally formed.
A speed clutch 28 is provided. The input side clutch carriers 29, 30 of the forward clutch 24 and the reverse clutch 25 are integrally connected to the input shaft 21, and the output side hub portions 31, 32 are respectively connected.
Are integrally connected to output shafts 33 and 34 which are rotatably supported on the input shaft 21. Each clutch is fitted in a friction plate (36) fitted slidably in the axial direction on the spline (35) on the inner circumference of the clutch carrier, and slidably fitted in the axial direction on a spline (37) on the outer circumference of the hub. The steel plate (38) and the backing plate (40) integrated with the clutch carrier (29) and the piston (39) that slides in the annular cylinder (not shown) of the clutch carrier in the axial direction by receiving the operating hydraulic pressure. The rotation is transmitted by being pressed and engaged by and. The gear 41 integrated with the output shaft 33 of the forward clutch 24 is connected to the gear 42 integrated with the intermediate shaft 22, and the reverse clutch
A gear 43, which is integral with the output shaft 34, of 25, is meshed with a gear 45, which is integral with the intermediate shaft 22, via a reversing gear 44 rotatably supported on the output shaft 23.

A first speed clutch 26 and a third speed clutch 27 face the intermediate shaft 22, and respective clutch carriers 46 and 47 are provided integrally with the intermediate shaft 22. Also, the hub part on the output side
48 and 49 are rotatably supported by the intermediate shaft 22 integrally with the output shafts 50 and 51, respectively. Output shaft 50 of first speed clutch 26
The gear 52 integrated with the gear and the gear 53 integrated with the output shaft 51 of the third speed clutch 27 mesh with gears 54 and 55 integrated with the output shaft 23, respectively. Step clutch 28
The hub portion 56 on the input side of the second speed clutch 28 is integrally rotatably supported on the output shaft 23 together with the input shaft 57, and the gear 58 integrated with the input shaft 57. Meshes with a gear 59 integral with the intermediate shaft 22.

(Operation) The input shaft 21 of the power shift transmission of the present invention configured as described above is connected to the engine via a torque converter (not shown), and the output shaft 23 is connected to an axle via a differential gear (not shown). When they are connected to each other, the rotation from the engine is speed-changed and transmitted to the wheels. Then, the shift change is performed by selectively engaging each clutch. For example, forward clutch 24 and first gear clutch
In 26, both clutches to which clutch operating oil pressure is applied from a hydraulic source (not shown) via a pressure regulating valve and a switching valve are engaged, and from the input shaft 21 to the intermediate shaft 22 via the forward clutch 24 via the gears 41 and 42, Then, the first speed clutch 26 of the intermediate shaft 22
2nd forward rotation of the output shaft 23 through the gears 52 and 54
It is transmitted through even meshing of points. At this time, when the forward clutch 24 is switched to the reverse clutch 25 to be engaged, the intermediate shaft is transmitted from the input shaft 21 to the reverse clutch 25 via the gears 43, 44, 45.
Then, the rotation of the reverse first speed is transmitted from the first speed clutch 26 to the output shaft 23 in the same manner as described above, through the three odd-numbered meshes. In the same manner, by engaging the required clutches, the rotations of the forward and reverse second speeds and third speeds are transmitted. Since each shift stage goes through the reversing gear in the case of backward movement, the number of meshes is odd in all three places, and in the case of forward movement, both are even in two places.

(Effect of the Invention) As described above, in the present invention, in the power shift transmission of the forward and backward third speed, the reversing gear 44 is provided on the output shaft 23 so as to freely rotate, and the reverse clutch 25 is used to reverse the reversing gear.
Since it is configured to transmit the reverse rotation to the intermediate shaft 22 having the clutch of each gear and the output shaft 23 via 44,
The effect is that the shaft required to provide the reversing mechanism can be omitted, and the housing can be made compact and the cost reduced accordingly.

[Brief description of drawings]

1 and 2 are power shift transmissions of the third forward and reverse speed stages of the present invention, FIG. 1 is a simple structural view showing a II-II section of FIG. 2, and FIG. 2 is a vertical sectional view. Similarly, FIGS. 3 and 4 are conventional examples, FIG. 3 is a simple structural view showing the IV-IV cross section of FIG. 4, and FIG. 4 is a vertical cross sectional view. 21,57 …… Input axis, 22 …… Intermediate axis, 23,33,34,50,51 ……
Output shaft, 24 …… Forward clutch, 25 …… Reverse clutch, 26
...... 1st speed clutch, 27 …… 3rd speed clutch, 28 …… 2
High speed clutch, 41, 42, 43, 45, 52, 53, 54, 55, 58, 59 …… gear, 44 …… reversing gear.

Claims (1)

[Scope of utility model registration request] 1. An input shaft, an intermediate shaft, and an output shaft, wherein an input shaft is provided with a forward clutch and a reverse clutch integrally connected to the input shaft, and an intermediate shaft is provided with a first speed clutch. A power shift for forward and backward 3rd speed, in which a 3rd speed clutch is provided on the input side integrally with the intermediate shaft and a 2nd speed clutch is provided on the output shaft by integrally connecting the output side with the output shaft. In the transmission, the gear (41) integrated with the output shaft (33) of the forward clutch (24) is meshed with the gear (42) integrated with the intermediate shaft (22) to form the output shaft (34) of the reverse clutch (25). A gear (4) that is integral with the intermediate shaft (22) via an inversion gear (44) that rotatably supports the integral gear (43) on the output shaft (23).
5) meshed with the output shaft (50) of the first speed clutch (26) and the gear (52) integrated with the output shaft (23) and the gear (54) integrated with the third speed clutch (27) The gear (53) integrated with the output shaft (51) is meshed with the gear (55) integrated with the output shaft (23), and the gear (59) integrated with the intermediate shaft (22) is connected to the second speed clutch (28). A power shift transmission for the forward and backward third speeds, characterized by meshing with a gear (58) integrated with the input shaft (57) of the.