JPS5954821A - Speed change gear - Google Patents

Abstract

PURPOSE:To prevent each gear from slipping off, by making up an incline that sets the side of an insertion direction toward the tooth of a shaft collar down to a large broad, while forming an inner circumferential groove in the innermost part of internal gears of an inner gear assembly. CONSTITUTION:An inner gear 10b is provided with a chamfer 10c so as to make a tooth part insertable and an inner circumferential groove 10a is formed up in the innermost part of internal gear. No inclination is provided for the gear tooth itself in the inner gear 10b, that is, a parallel tooth form in type. A tooth 21b of the inner gear 10b is made up in form being provided with an incline 21c so as to cause the side of a chamfer 21d to be a large broad while the reverse side to be a small broad, respectively. When both teeth are engaged in mesh, a projecting part of the chamber falls in the inner circumfeential groove 10a and thereby both teeth are engaged with each other at a square part (a) so that they come to be hard to slip off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an invention for preventing gear slippage in a gear sliding type transmission using a shift collar in a transmission.

Since the shift collar of a transmission using a shift collar can be made small, it has the advantage of being more compact than a gear-sliding type transmission in which the entire gear slides.

However, it also has the disadvantage that it is easy to cause the so-called gear slippage phenomenon in which the meshing surface of the shift collar slips out due to thrust force.

In order to prevent the gear from coming off when the shift collar is engaged, the teeth of the soft collar are formed with an inclined surface that is wide on the insertion direction side and gradually becomes narrower. By configuring an inner circumferential groove at the back of the internal teeth, the corners of the groove and the inclined surface engage with each other to prevent the gear from falling out.

The purpose of the present invention is as described above, and the detailed structure of the present invention will be explained based on the structure of the embodiment shown in the accompanying drawings.

Figure 1 is a side sectional view of the transmission case of an agricultural tractor. Figure 2 is the front view. Figure 3 is a plan sectional view of the gear shifter shaft of the transmission case. Figure 4 is an enlarged view of the shift collar and inner gear. Fig. 5 is a side sectional view showing the support part of the reverse gear (8) Fig. 6 is a side sectional view of the fixed gear (10) Fig. 7 is an inner surface showing the tooth profile of the inner gear (iob) part Figures and rear view Figure 9 is a side sectional view of the shift collar (21) Figure 10;
11 and 12 are a plan view, a rear view, and a side view showing the tooth profile of the shift collar (21). FIG. 13 is a drawing showing the meshing state of the teeth of the shift collar and the teeth of the inner gear.

Figure 14 shows the side view of the front wheel power take-off device. Cross section FIG. 15 is a front sectional view.

In FIG. 1, the rotation of the engine is input to the Michachon case (?JQ) PTO power transmission shaft (1) through the PTO side of the dual clutch device. The traveling driving force is transmitted from the traveling side of the dual clutch to the cylindrical shaft (3a) on which the fixed gear (3) is carved. Fixed gears (4), (5), and (6) are fixed to splines on the cylinder shaft (3a). The fixed gear (31 (4) (5 pa 6) is always meshed with the loosely fitted gear (7) (9) (1 υ 0 υ) on the counter shaft (2) and rotates.

The selection of the idler wheels (7) (91 (10) and (11)) is performed by color shifts (20) and (21). Each shift collar is provided with teeth (20a) and (20b). Idle 1 gear (7) (91 inner gear (7b09)
b) meshes with In addition, the shift collar I2nvc has teeth (
21a) (2lb> is provided, idle gear 0
0. ．． <Iυ. meshes with the inner gear (xob) (llb) of A reverse gear (8) shown in Fig. 5 is interposed between the fixed gear (3) and the loose gear (7) to obtain reverse speed. 2 forward speeds, 1st speed, and 3rd speed are available.

The present invention relates to the shape of the shift collar and the teeth of the inner gear.

An integrated loose gear tooth unit (1 gear 4) is loosely fitted to the TO power transmission shaft (1) from the carved gear a on the rear end of the counter shaft (2).
) (conveyed to 151 people.

The loose-fit gears (141 and 00 mesh with the loose-fit teeth (10 and sliding gear 08) on the pinion shaft (191), and the shift collars (22a) (22b) mesh with the inner gear (12b) (i
By meshing with 6b), high, medium, and low sub-shifts can be obtained. θ is the front wheel power counter gear, %(19a)f
'j: Pinion.

FIG. 3 shows the speed change shifter shaft and the arrangement of the shifter. Shifter axis (33) (9) and shifter order} ((
The combination of (d) is for the main transmission and the shifter (3"γ)
The shifter (37) fits into the shift collar, and the shifter (size fits into the shift collar 〇υ) and slides.

The main shift lever ul) selects the locking groove of the shifter 971+88) and moves it back and forth. The shifter shafts 01) and 0 are shifter shafts for sub-shifting, the shifter (2) engages with the shift collar (self), and the shifter (80) engages with the sliding gear ae.

Sub-shift lever? ? ? ) is the engagement body G31+)+
It moves within the groove 801 and changes gears. (351trJ.
Rear: 4B high-speed check stopper.

Detent groove (33) on shifter 11i1tl (33)
a) and the interlock groove (.33b) were conventionally used as a single groove as the entire circumference groove, but the detent groove (.33a)
a3a) <33a) If you carve three lines all around the circumference, the interlock ball may somehow fly off and enter the detent groove, resulting in a double engagement accident, so for safety's sake, It is configured as a notched groove instead of a full circumference groove. The other three shifters (st+ (8216k
The same configuration is used for the detent grooves and interlock grooves in l).

The method of supporting the reverse gear (8) will be explained with reference to FIGS. 2 and 5.

A projecting wall (30) protrudes from the mission case (M) and supports the shaft (d). Install a tapered roller bearing (c) on the shaft (c) and play the reverse gear (8).
are doing. Since the reverse gear rotates at low speeds and is subjected to high torque, it is supported by tapered roller bearings to increase its strength, but tapered roller bearings need to be tightened and fixed by applying a certain amount of extra pressure during assembly. Since it is not possible to apply extra pressure from the direction of the projecting wall (30) during assembly, the structure is such that extra pressure is applied from the front of the transmission case using bolts (23).

Screw the shaft (A) and the backing plate (27) with bolts (28) so that the gap can be adjusted, place this backing plate against the front of the fc transmission case, tighten the nuts of the bolts (29a) and (29b), and tighten the shaft. By pushing in (25), extra pressure is applied to the tapered roller bearing (c). @ is a rotation stopper.

Figure 14. FIG. 15 is a diagram showing the state in which the front wheel drive case 18) is attached to the opening in the bottom of the mission case Nv and the front wheel drive force is extracted.

Mesh the loose fit gear fA with the front wheel power counter gear,
The loose-fit gear (d) is the loose-fit gear on the front PTO shaft ← W (
50). It is configured to be connected to the front PTO shaft with a loose fit gear ([501'k clutch gear (52)).

The loose fit gear (55) is a tapered roller bearing @ku (
The shaft (44) is supported by a shaft (44) with a nut (4t5) to provide extra pressure. (5a) is a front wheel drive clutch lever.

In the overall structure as described above, the main part of this incident is the seventh
This is shown in Figure 13.

That is, the loose fit gear (10 inner gears (10b)
figure. As shown in FIG. 8, a chamfer (10c) is provided to facilitate insertion of the teeth. An inner circumferential groove (10a) is bored in the back of the tooth. Inner gear (10
The tooth b) itself has no slope and has a parallel tooth profile.

In contrast, the teeth of the shift collar (21) (2 1.b
) is a chamfer (21
d) Side g is wide and the opposite side is narrow (21
c). When these two teeth mesh, the protrusion of the chamfer sinks into the inner circumferential groove (10a') as shown in FIG. 13, and the teeth engage at the corner (a), making it difficult to slip out.

The idle gears (7) (9) (
]00η each with inner gear (7b) (9b)
clOb>('11}+:), and an inner circumferential groove (7
9a) (1.0a..) (.1l.a)'); engraved. Similarly, shift color (2) 11 Q. )
Inclined surfaces are formed on the teeth (20a), (20'b), (21a), and (2lb).

The same applies to the gear (1aQ(it.!:) of the sub-transmission device, and the shift collar l22l.

As described above, the present invention has teeth that slide on the spline of the shaft, and a radial slope that is larger in the insertion direction on the teeth of the shift collar, and a radial slope that is larger in the insertion direction. Since the inner circumferential groove is configured, when the shift collar is engaged and the teeth are inserted, the large chamfer part of the shift collar teeth will fit into the inner circumferential groove, and the inclined surface and the corner of the inner gear will engage. , a thrust force acts in the direction in which the shift collar is inserted, making it difficult to remove. As a result, it is possible to prevent gear slippage, which is a drawback of shift collar type transmissions, and even though it is a gear type transmission, it can be constructed in a small and compact size.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the transmission case of an agricultural tractor. Figure 2 is the front view. Figure 3 is a plan sectional view of the gear shifter shaft of the transmission case. Figure 4 is an enlarged view of the shift collar and inner gear. Figure 5 is a side sectional view showing the support part of the null bar gear (8). Figure 6 is a side sectional view of the fixed gear 0Q. Figure 8 is an inner view and rear view showing the tooth profile of the inner gear (101) part. Figure 9 is a side sectional view of the swift collar Q sword. Figure 10. 1st
Figures 1 and 12 are plan views showing the tooth profile of the shift collar (). Rear view. Side view. It is a side view and a front view of the good neighbor drive device. (10b)... Inner gear (10a)... Inner circumferential groove (gII... Shift collar (2lb)... Shift collar teeth (21c).・・Slope surface

Claims (1)

[Claims] The toothed shift collar that slides on the spline of the shaft has an inclined surface that is larger toward the insertion direction, and an inner circumferential groove is formed at the back of the inner teeth of the inner gear into which the shift collar is inserted. Characteristic transmission device