JPS58180321A - Speed change operating device - Google Patents

Abstract

PURPOSE:To simplify construction and easily perform assembly and inspection, by forming a window hole to the side wall of a transmission case and pivotally mounting a link in a swivellable state to a window cover closing the hole. CONSTITUTION:A window hole 69 is formed at the bottom side of a side wall 68 of an intermediate case 5, and a shift gear and shifter are arranged in the vicinity of this hole 69, then the hole 69 is closed by a window cover 70 from the outside. A pivotally supporting pin 72 is protrusively provided to an internal face of the cover 70, and the half way part of a link 66 used as an interrupting lever is undetachably but swivellably fitted to the pin 72. Then an upper pin 73 of the link 66 serving as the interrupting lever and a bottom pin 76 of the link 66 and an engagement part 77 formed to a shift fork 56 are attached disengageably from the outside respectively to an engagement part 75 of an engaging member 74 fixedly fitted to a shift rod 67.

Description

[Detailed description of the invention]

The present invention relates to a speed change operating device for a tractor, a tiller, etc. The transmission mechanism of a tractor, tiller, etc. is built into a transmission case, and the transmission mechanism is configured to operate the shifter, A″2 shift gear, and other operated items through the operation operation system of the transmission lever. The transmission mechanism is built into a narrow transmission case.
Assembling, maintaining and inspecting the operating tools is troublesome, and the structure is complex.
It was unnecessarily large. Therefore, in the present invention, a window hole is formed in the side wall of the transmission case corresponding to the transmission mechanism, and a link is pivotally mounted in front of the window that closes the window hole, so that assembly is easy and the transmission mechanism can be easily accessed from the outside. This eliminates the problems of the conventional method by making it possible to perform inspections. Therefore, in the present invention, in a transmission operating device in which a transmission mechanism is built in a transmission case and slides an operated part of the transmission mechanism via a link, a window is formed in a side wall of the mission case corresponding to the operated part of the transmission mechanism. is formed, and has a removable window front that closes the window hole, and a link is swingably pivotally attached to the inner surface of the window front, and the link connects an operating tool and a gear shift lever that engage with the operated tool. It is characterized by being able to be freely engaged with and detached from the outside of each of the retaining parts with the actuating operation system. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, (1) is a clutch housing, which has a built-in double clutch device. (3) is a transmission case, which is formed by joining a front case (4), an intermediate case (5), and a rear case (6) back and forth. Front case (
4) has a built-in main transmission (7) and a PTO subshaft (8), and the main transmission (7) is connected to the PTO subshaft (8) via the main shaft (9). ) is the reduction gear [+10
), are linked to the outside and the engine by a double clutch device (2) via the PTO main shaft (n), respectively. Intermediate case (
6) has a built-in leap device tHI2+ for running and a PTO transmission (13), and the rear case (6) has built-in a running auxiliary transmission fli(n), a differential gear (15), etc. As illustrated in detail in Fig. 2, the PTO subshaft (8) is rotatably supported by the partition wall (+6) (17) of the front case (4) via the pole bearing (+8) (19). , this P
Spline type shaft joint (2o) at the rear of the TO subshaft (8)
The first PTO transmission shaft (hereinafter referred to as the first shaft) (2+
+ is connected. The first shaft (21) is connected to the bearing case (2
2 is rotatably supported via three pole bearings (23) (24) (Incorporated), and the intermediate case (2) is supported rotatably through three pole bearings (23), (24) (24), and the bearing case (2) protrudes into the front case (4).
5) is attached to the front bulkhead (X!6). P.T.O.
The transmission @ (13) has a second PTO transmission shaft (hereinafter referred to as the second shaft) e28), a constant engagement gear transmission mechanism (29), and a selective engagement gear transmission mechanism (30). Third person (28)
is arranged behind the first shaft (21), and this third shaft (21)
8) The second axis (2 forces are arranged above the second axis (2 forces).
27) is connected to the partition wall (2) of the intermediate case (5) via the pole bearings (31) (32) at the front end and the roller bearing (33) at the rear end.
6) +34), and is rotatably supported by the third shaft (2).
8) has a curved end formed at the rear end of the first shaft (21).
3 (to) via a bushing (36), and the rear end is fitted into the partition wall (3) via a pole bearing (3η).
It is rotatably supported by the stems. The first gear transmission mechanism 9) is a constant engagement type using Haspa gear, and is a gear fixed to the second shaft (27).
(38) (39) and a gear (40) integrally formed at the rear end of the first shaft (21) to engage with the gear (38).
), a gear (41) fitted on the third shaft (2 to
0) A shifter (42) is slidably fitted onto the spline boss (42) between (41), and two-speed shifting is possible by sliding the shifter (43). The transmission mechanism (30) is of a selective engagement type using a spur gear, and has a gear (27) fixed on the second shaft (27).
44) (a), and two shift gears (46) that are slidably spline-fitted on the third axis for selective engagement with this gear (44) +46).
Two-speed shifting is possible by sliding the foot gear (46). The third shaft (28) is linked to the PTO shaft (9) 8 shown in Fig. 1 via the fourth PTO transmission shaft (hereinafter referred to as @4 shaft) (47). and the fourth axis (4
7), the fourth shaft (47) and the PTO shaft (48) are interconnected via a spline-type shaft coupling +49+1150). The fourth shaft (4η is rotatably supported by the partition wall M of the rear case (6) (541) via two pole bearings (51) (52) at both front and rear ends. Shifter (43) and shift gear (46) constitute operated tools, and are slidable in the axial direction on the same axis in this example, on the third axis (28) in this example, and the shifter (46)
The sliding amount of the shift gear (46) is larger than the sliding amount of 3). As shown in Fig. 4, a shift fork (65) is engaged with the shifter (43), and a shift fork (56) is engaged with the shift gear (46), and these shift forks are operating tools. It constitutes the operation system, and in this example, the shift fork for the shifter (551 is the shift rod (57)
In addition, shift forks (56) for shift gears are fitted and fixed to shift rods (58), respectively. As shown in Figure 3, the front case (the upper part is around the foot of the J seat (not shown), and there is a gear shift lever 9 in the vicinity) can be operated in an H-shaped gear shift pattern as shown in Figure 5. It is erected. The lower end of the gear shift lever 9) has an engagement recess (62) (fi) of two parallel shift rods (6 (support) (61)).
ll can be engaged in the neutral and H-shaped patterns shown in Figure 5, and each shift rod (6υ) has a thick
The shift lever (65) for the shift gear and the shift lever (65) for the shift gear are respectively fitted and fixed to the front case (4).
The sidewalls are lowered along the inner surface. As shown in Fig. 3.4, the shift lever (66j) is long and the latter is short.The lower end of the shift lever (64) is connected to the shift lever (66j). The lower end of the shift lever (the lower end of the shift lever is engaged with the front end of the shift rod (67) which is linked to the shift rod (58) via the link (6B'l) which becomes a relay lever. As shown in Fig. 3, the shift rods are parallel to each other and can swing freely in the front and back (left and right in Fig. 3) directions. Side wall (6
A window hole (69) is formed in the lower part of the shed, and a shift gear decoy and a shifter (9) are arranged near this window hole (69). M UO
), and the plurality of attachments shown in FIG. 3 can be freely attached and detached by screwing bolts (not shown) into the holes (71). Furthermore, a pivot pin (72) is protruding from the inner surface of the window front enclosure, and a link ((to) that becomes a relay lever is attached to the pin (c) so that it can swing freely and cannot be detached from the mantle). The link that becomes the relay lever (upper pin t73 of 6φ) secures the engagement body 9 that is fitted and fixed to the shift rod (67), and the lower pin of the link that becomes the relay lever (+66) (Electric shift fork (5B) K formed retaining part Vη,
Each can be engaged and detached from the outside. In other words, the link (70) that serves as a relay lever on the pin Q2 is removably attached to the window hole (69), and when the window hole V0) is attached, the pin (73) is secured. A pin 78) can be engaged between the retaining parts. Furthermore, in order to make the shift gear (46) slide a predetermined amount via the link (66) that serves as a relay lever (similarly, the operating amount of the shift lever haze is the same), the link (66) that serves as a relay lever is used.
6 (to), that is, the pin (3), as shown in Fig. 3, L2 is lengthened with respect to 9
) operating amount for shifter (43) and shifter (43).
Even if the case 46) is the same, a predetermined speed change operation is possible. Next, the effect will be explained. The shift operation of the PTO transmission (13) is performed using the shift lever (5).
9) according to the H-shaped shift pattern from the neutral state shown in Fig.
(61, the shift lever (64), the shift rod (5η) and the shift fork (50) are slid in the front and back direction, and here, the constant engagement one-gear transmission mechanism (9) is shifted into two stages. On the other hand, the shift gear 06) moves forward and backward through the shift rod @0, the shift lever (6 (to), the shift rod (6η, the link that becomes the middle m lever, the decoy, the shift rod (68), and the shift fork (58)). Here, the selective engagement type gear transmission mechanism ((to) is shifted to 2 steps, and the PTO shift can be shifted to 4 steps. At this time, the amount of sliding #J of the shift gear 06) is changed to the shifter (individual). Although it is longer than the sliding amount of the relay, even if the operating amount of the shift lever (59) is the same

The amount of sliding of the shifter (46) can be increased by the link ratio ((to) which becomes [/par), and in this way each transmission mechanism (7!9) (30) operates independently. , the shift pattern can be made into the H-shape as described above, and the shift operation is easy.
Since the same result can be achieved in either case, it is the same as widening the footwell in front of the driver's seat. Shifter of the first transmission mechanism (29) (4 barrels to gear (40)
) side, or when transmitting power via the second transmission mechanism (30), the third shaft (2 gears = (
41) is the second axis! ]0 (27) is in an idling state via the upper gear (39), but since this gear (41) is the only one that is idly rotating,
Even if a rotation unevenness occurs from the universal joint shaft side on the PTO shaft (4~), the only place affected by the rotation unevenness and that becomes a source of noise is the occlusal part of the gear (89) (41). , noise generation can be reduced. Shift fork (55) (56), shift rod φ81
(57) When assembling the link (6 clauses, etc.) that becomes the link and relay lever, due to the structure, the PTO transmission 1t (13) is located at the bottom of the intermediate case (5), and the leap that runs above it This can be easily done even if there is a device θ2). That is, after assembling the transmission @ (+3j etc.), the shifter has a window hole (69) formed in the lower side of the intermediate case (5), and the fork (
3) (56) etc., the window hole (69)
) The shift fork +55) (56) etc. can be assembled while looking through the window, which makes the work easier.The link (66) that will become the relay lever is pivotally connected to the window pane (V0) by means of a pin (7). By blocking the window hole (69) of the handle 11 with the lid (70), the link (66) that will become the relay lever can be assembled from the outside. is the window hole (
69) It has been made shorter. In addition, window units (70
), the link (6(2)) can also be removed and the transmission mechanism (13) can be inspected from the outside through the window hole (69). )(
30) may be reversed, and the transmission mechanism may be PTO.
It is not limited to shifting. The present invention provides an apparatus in which an operated tool of a transmission mechanism built in a transmission case slides via a link that interlocks with a gear shift lever, in which a window hole is formed in the side wall of the mission case corresponding to the operated tool, Since the link is pivotally attached to the window that closes the core, the fulcrum of the link can be shared by the window, which can simplify the structure and make it more compact. Furthermore, since the link can be freely engaged and detached from the outside of the retaining part of the gear shift operation system, assembly is very easy.Furthermore, since the link can be removed together with the window, it is possible to remove the window and open the window. It has the advantage that it can be used as a viewing window to inspect and correct the assembly status of the internal transmission mechanism, operated tools, etc.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, with Figure 1 being a configuration diagram showing the overall outline of the mission, Figure 2 being a sectional view of the transmission mechanism, and Figure 3 being a cross-sectional view of the transmission mechanism.
4 is a side view of the speed change operation mechanism, FIG. 4 is a view taken along the line AA in FIG. 3, and FIG. 5 is a plan view of a portion of the speed change lever. (3)...Mission case, (l)...Transmission mechanism, (4Q...Operated tool, (5)...Operation tool, 6
Scratches...gear lever, wheels...links, screws...window holes,
Q*...Window unit, 17G(c)...Retention part.

Claims (1)

[Claims] 1. A transmission mechanism α3) is built in the transmission case (3), and the transmission mechanism (α3) is connected via a link f4 to a transmission operating device that slides an operated tool (anchor) of the transmission (13).
Mission case (3) corresponding to the operated tool (13)
A window hole (2) is formed in the side wall of the window hole (2), a removable window front (70) is provided to close the window hole, and a link (2) is swingably pivoted on the inner surface of the window front (Q0). The link branch is capable of being freely engaged and disengaged from the outside of the engagement portion (i'! (c)) between the operating tool (66) that engages with the operated tool section and the operating operation system of the gear shift lever. Characteristic gear shift operation device.