JPS6117748A - Transmission mechanism of service car - Google Patents

Abstract

PURPOSE:To provide a compact transmission case by arranging reasonably a forward and backward rotation change-over mechanism and a super low speed reduction gear. CONSTITUTION:The rotation of an engine transmitted to an input shaft 5 in a transmission case 1 is transmitted to a first speed change shaft 6 concentric with the input shaft 5 through a first speed change mechanism M, and the rotation of the first speed change shaft 6 is transmitted to a forward and backward output shaft 7 through a forward and backward rotation change-over mechanism B. The rotation of said shaft 7 is transmitted to a second speed change shaft 8 concentric therewith through a second speed change mechanism S, and the rotation of this shaft 7 is transmitted to a drive pinion shaft 9 through a super low speed change mechanism C longitudinally parallel to the second speed change mechanism S. By such arrangement the longitudinal length of the transmission case 1 can be shortened.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mission mechanism for a work vehicle such as a tractor, and is devised so that the mission case can be miniaturized when various transmission mechanisms are provided. be.

Conventional technology When an ultra-low speed reduction mechanism is provided in a normal transmission mechanism such as a main transmission mechanism or a sub-transmission mechanism, and a forward/reverse switching mechanism, conventionally, the forward/reverse switching mechanism is connected to the power transmission side of the transmission mechanism. rank,
Alternatively, the ultra-low speed reduction mechanism is located at the rear of the transmission mechanism. For this reason, the forward/reverse switching mechanism and the ultra-low speed reduction mechanism each occupy space in the front and back directions of the mission case, making the mission case longer and hindering miniaturization.

Problems to be Solved by the Invention The present invention attempts to downsize the transmission case by arranging the forward/reverse switching mechanism and the ultra-low speed reduction mechanism' in rational positions.

Means for Solving the Problems In order to solve the above problems, the present invention provides a wheel drive unit (
1 transmission mechanism (1) configured to drive each of the II.
Sl and this transmission mechanism (81) are arranged in parallel with each other in the longitudinal direction of the transmission case (1), and this transmission mechanism (81) and an ultra-low speed reduction mechanism (Q) that can output at a lower speed than the transmission mechanism +81 and ultra-low speed reduction mechanism It is a mission mechanism in which a transmission mechanism (S) and a forward/reverse switching mechanism (B) capable of switching the output of (Q) between forward and reverse directions are arranged on one side of the front and rear of (q).

Embodiment and operation Next, an embodiment of the present invention will be explained based on the drawings. 1st
Figures 2 to 4 show the longitudinal and lateral development of the mission case.
The figure shows A-A in the undeveloped state in FIG. 1, respectively.
Although the arrow views of B-B and C-C are shown, the rotation of the engine on the left side of Fig. 1 is transmitted to the clutch output shaft (3) of the main clutch (2) in the upper part of the transmission case (1). The gear train (4) transmits the VC of the input shaft (5) below the clutch output shaft (3), and the rotation of the input shaft (5) is transmitted to the first transmission shaft (6) concentrically with the first transmission shaft (6). - The rotation of the first speed change shaft (6) is transmitted through the forward/reverse output shaft (6) through a forward/reverse switching mechanism (G) provided on the left and right sides of the first speed change mechanism. (The rotation of the force is transmitted to the forward/reverse output shaft (8) via the second speed change mechanism (81), which is concentric with this forward/reverse output shaft (81). The rotation of the transmission case (
1) Ultra-low speed reduction mechanisms installed in parallel in the longitudinal direction (transmitted to the drive pinion shaft (9) via q,
Drive pinion shaft (9) on wheel drive unit 0 on the right side of the diagram.
The second transmission mechanism fsl
, a forward/reverse switching mechanism (Bl) is placed on the front side of the ultra-low speed reduction mechanism (Q (on the left side in Figure 1).The illustrated first transmission mechanism is fitted into the counter gear shaft flu). The gear (121, (+3)) meshes with the gear α of the input shaft (5), the transmission gear 09 which rotates idly on the first transmission shaft (6), and the gear which rotates idly on the counter gear shaft 0υ. tie, a
η is the transmission gear fitted to the first transmission shaft (6), 1!1
The gears mesh with each other and produce variable speed output as shown in Table 1.

Table 1 First transmission mechanism (goods) In addition, the illustrated forward/reverse switching mechanism (Bl is the reverse idle gear C4 fitted to the back idle shaft [231] 2 and transmission gear (
The forward rotation idle gear (26) that meshes with both the forward and reverse output shafts (the sumo wrestlers) meshes with the transmission gear (marked 1), and outputs as shown in Table 2.

The illustrated second transmission mechanism (81 is a small diameter gear (2) of the forward/reverse output shaft (7) is a large diameter gear (291K mesh, the second transmission shaft Since the gear (30) fitted to the drive pinion shaft (8) meshes with the gear Cl1l fitted to the drive pinion shaft (9), the output is as shown in Table 3.

Table 3 Second transmission mechanism (31) The illustrated ultra-low speed reduction mechanism (q is the transmission case (1)
) The creep shaft is pivotally supported on the mounting cover (34 (which pivotally supports the back idle shaft and the rear part of the second gear shift shaft (8)) attached to one of the left and right sides of the , the large-diameter gear (to) fitted on the creep shaft (c) meshes with the small-diameter gear 128), and one large-diameter gear (3n) and the small-diameter gear (to) are loose on the second transmission shaft (8). The small diameter gear C31 fixed on the creep shaft field meshes with the large diameter gear c3η, and the large diameter gear +4CI freely rotating on the drive pinion shaft (9) becomes the small diameter gear (to).
Table 4 Ultra-low speed reduction mechanism (q) Transmission mechanism-1 (S), (Q can be of various types with similar functions in addition to the structure shown in the figure. The rotation of the hollow output shaft (42) connected to the flywheel of the clutch (2) is transferred to the input shaft (44) via the gear train (43).
and the PTO shaft (to) by the PTO clutch (c).
is driving. Also, the rotation of the gear (to) is the rotation of the gear (47).
), (In particular, the front driving force is transmitted through the front drive force extraction shaft (4).

Effects of the Invention The present invention is configured as described above, and the transmission mechanism (81) and the ultra-low speed reduction mechanism (Q) are connected to the transmission case (
1) are arranged in parallel with each other in the longitudinal direction, and the transmission mechanisms (S
), a forward/reverse switching mechanism (Bl
Therefore, the forward/reverse switching mechanism (B) will be provided next to the front and rear sides where the transmission mechanism (fs) and the ultra-low speed reduction mechanism (Q are arranged).
Since l does not occupy the length of the mission case (1), the mission case (1) can be made shorter than conventional ones, and as a result, the wheel base can be shortened, making it suitable for work with a small turning radius. It could be used as a vehicle.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Figure 1 is a longitudinal side exploded view of the transmission case, and Figures 2 to 4 are line A-A, line B-B, and line c-c in Figure 1, respectively. It is a line arrow view. Description of symbols (1)...Mission case a@...Wheel drive unit (81...Transmission mechanism (Q...Ultra low speed reduction mechanism (B)...Forward/reverse switching mechanism patent applicant: Iseki Agricultural Machinery Co., Ltd.r-″゛-co Agent Patent Attorney Hayashi “j′,:,”’:
,,,l ”'”'1-126.-1; Figure 2 Figure 3

Claims (1)

[Claims] A transmission mechanism configured to drive each of the wheel drive units and an ultra-low speed reduction mechanism capable of outputting at a lower speed than this transmission mechanism are arranged in parallel with each other in the longitudinal direction of the transmission case, 1 before and after this transmission mechanism and ultra-low speed reduction mechanism
A transmission mechanism for a work vehicle, characterized in that a forward/reverse switching mechanism is disposed on one side of the transmission mechanism to switch the output of the transmission mechanism between forward and reverse directions.