JPH068360Y2 - Forward / reverse switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a forward / reverse switching device using a plurality of sets of planetary gear mechanisms.

[Conventional technology]

An example of a forward / reverse switching device using a plurality of sets of planetary gear mechanisms as described above is disclosed in Japanese Utility Model Publication No. 37-4220.

In this forward / reverse switching device, as shown in FIGS. 3 and 4 of the publication, the forward rotation sun is attached to the input shaft ((1) in FIGS. 3 and 4 of the publication) to which power is transmitted. Gear (the same (3))
, And the forward rotation carrier (same as (7)) that is fitted to rotate relative to each other, supports four forward rotation planet gears (same as (5)) that mesh with the forward rotation sun gear. The forward rotation planetary gear is equipped with a forward rotation internal tooth ring gear (the same (10)) that engages from the outside.

As a result, when the forward rotation carrier is fixed by the lock mechanism (the same (9)), the power of the input shaft is transmitted to the output shaft (the same (2)) via the forward rotation planet gear and the normal rotation internal gear ring gear. It is transmitted in a predetermined rotation direction.

With respect to the above configuration, as shown in FIGS. 3 and 8 of the publication, the input shaft (see FIGS. 3 and 8 of the publication
(1)) fixing the reverse sun gear (same as above, (3)) to the reverse carrier (same as above, (7)) which is rotatably fitted to the outside. A planetary gear (same as (13)) and four second reverse planetary gears (same as (14)) that mesh with the first reverse planetary gear are supported, and each second reverse planetary gear has a reverse mesh that meshes from the outside. It is equipped with a tooth ring gear (the same (10)).

As a result, when the reverse rotation carrier is fixed by the lock mechanism (the same (9)), the power of the input shaft is transmitted through the first and second reverse planetary gears and the reverse internal gear ring gear to the output shaft (the same (2)). )
Is transmitted in a rotation direction opposite to the above-mentioned state.

[Problems to be solved by the device]

As described above, in the conventional forward / reverse rotation switching device, when the switching operation is performed between the normal rotation and the reverse rotation, the number of planetary gears in the configuration of the normal rotation or the reverse rotation is twice that in the other state. There is room for improvement in terms of simplification of the structure.

The present invention aims to reduce the number of planet gears in the forward / reverse switching device using the planetary gear mechanism as described above.

[Means for Solving the Problems]

A feature of the present invention is that the forward / reverse switching device using the planetary gear mechanism is configured as follows.

A forward sun gear and a reverse sun gear are provided on the input shaft to which power is transmitted, and a forward rotation carrier and a reverse rotation carrier are fitted on the input shaft so that they can rotate relative to each other, and a forward rotation planet gear that meshes with the forward rotation sun gear. Is supported by the forward rotation carrier, and the reverse rotation planet gear that meshes with the reverse rotation sun gear is supported by the reverse rotation carrier, and each of the forward rotation planet gear and the reverse rotation planet gear meshes with the normal rotation internal gear ring gear and the reverse rotation inner gear A forward rotation output gear is provided for the forward rotation carrier, a reverse rotation output gear is provided for the reverse rotation internal tooth ring gear, and a forward rotation driven gear and a reverse rotation driven gear of the output shaft arranged in parallel with the input shaft are provided. The forward rotation output gear and the reverse rotation output gear are engaged with each other, and the forward rotation internal tooth ring gear is fixed so that the reverse rotation carrier is in the free rotation state. Fixed To the that state, are provided with a switching operation freely switching mechanism the output state of the output shaft.

[Action]

(I) When configured as in the present invention, for example, as shown in FIGS. 1 and 2, when the forward rotation ring gear (L ₁ ) is fixed by the switching mechanism (R), the forward rotation planet gear (P ₁ ) becomes In conjunction with the rotation of the forward sun gear (S ₁ ), the inner circumference of the forward rotation internal gear ring gear (L ₁ ) revolves around its own axis, and the forward rotation carrier (C ₁ ) rotates accordingly. Te, the noninverted output gear forward driven gear to bite in (O ₁₎ (F ₁₎ and the output shaft (17), the power of the predetermined rotational direction is transmitted.

(Ii) Conversely, if the reverse rotation carrier (C ₃ ) is fixed by the switching mechanism (R), the reverse rotation planet gear (P ₃ ) cannot revolve, and only the rotation is performed in conjunction with the reverse rotation sun gear (S ₃ ). With reverse ring gear
(L ₃ ) rotates and the power in the reverse rotation direction is transmitted to the reverse rotation driven gear (F ₃ ) that meshes with the reverse rotation output gear (O ₃ ) and the output shaft (17). Become.

(Iii) As described in (i) and (ii) above, in the forward / reverse switching device of the present invention, by selecting whether the ring gear is fixed or the carrier is fixed by the switching mechanism, normal rotation and reverse rotation can be performed. Switching operation is being performed.

As a result, in the forward / reverse switching device of the present invention, it is only necessary to dispose one type of planet gear between the sun gear and the internal gear ring gear in both the forward and reverse rotation states. As shown in FIG. 8 of Japanese Utility Model Publication No. 37-4220, two kinds of planet gears are doubled between the sun gear and the internal gear ring gear in one of the forward rotation and the reverse rotation. Eliminates the need to place

[Effect of device]

As described above, in the forward / reverse switching device using the planetary gear mechanism, the number of planetary gears can be reduced by selecting and fixing the ring gear or the carrier. As a result, the structure of the forward / reverse switching device can be simplified, downsized, and lightened.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, around the input shaft (1) supported in the mission case (M), the drive gear (2) of the input shaft (1) is geared to rotate around the shaft core (P). Arrange three driven taper cones (3), and taper surface part of the taper cone (3)
A friction-type continuously variable transmission (A) is obtained by externally fitting a disc-shaped output rotating body (4), which is rotationally driven in contact with (7a), to the input shaft (1) in a relatively rotatable and slidable manner. Are configured.

The cylinder shaft (4b) (corresponding to the input shaft of the present invention) spline-fitted to the boss portion (4a) of the output rotating body (4) is extended along the input shaft (1) to form the cylinder shaft (4b). ), The power transmitted to the input shaft (1) is connected to the forward / reverse switching device (B).
It is transmitted to the taper cone (3) via the drive gear (2), is transmitted from the taper cone (3) to the output rotating body (4), and is transmitted from the cylinder shaft (4b) to the forward / reverse switching device (B). It is configured to be done.

As shown in Fig. 1, the taper cone (3) has a drive gear (2).
The cone (7) having the tapered surface portion (7a) is slidably fitted onto the shaft portion (6) supporting the driven gear (5) that engages with the shaft body (7), and the cone body ( An automatic pressure regulator (D) is provided on the large diameter side of 7).

The automatic pressure regulator (D) has a hat-shaped cam member (8) fixed to the shaft portion (6), a concave portion (8b) formed in the cam member (8), and a large diameter side of the conical body (7). Recesses (7b) formed on the end face, both recesses (7b),
It is composed of a torque transmitting ball (9) located between (8b). As a result, when the shaft portion (6) is rotationally driven, the torque reaction causes the ball (9) to move into the recesses (7b), (8b).
The cone (7) to the driven gear
(2) side, press the tapered surface portion (7a) to the outer peripheral edge portion of the output rotor (4), the taper surface portion (7a) and the output rotor.
(4) Increase the frictional force between and.

Further, as shown in FIG. 1, even when the rotation speed of the shaft portion (6) is low and the automatic pressure regulator (D) is not operating, the cone body (7) is urged toward the driven gear (5) side. A spring (10) is provided between the tapered surface portion (7a) and the output rotary body (4) to generate a frictional force sufficient to rotate the output rotary body (4).

The taper cone (3) is supported at two positions, that is, the driven gear (5) side of the shaft (6) and the automatic pressure regulator (D).
In this case, the part on the driven gear (5) side is the mission case (M).
The automatic pressure regulator (D) is supported by the mission case (M) via the bearing holder (11). The bearing holder (11) is a cam member.
The boss (8a) of (8) is rotatably supported via the thrust bearing (12) and the radial bearing (13),
Place the bearing holder (11) on the axis of the mission case (M).
Inserted and fixed from the outside of the mission case (M) in the direction along (P).

Next, the forward / reverse rotation switching device (B) will be described.

As shown in FIGS. 1, 2, and 3, the first sun gear (S ₁ ) (corresponding to the forward sun gear) and the second sun gear (S ₂ ) are attached to the end of the cylindrical shaft (4b).
And the third sun gear (S ₃ ) (corresponding to the reverse sun gear) are integrally formed, and the first carrier (C ₂ ) is attached to the large-diameter first sun gear (S ₂ ).
₁ ) (corresponding to the forward rotation carrier) is rotatably fitted to the outside, and the second carrier (C ₂ ) and the third carrier are attached to the second sun gear (S ₂ ) and the third sun gear (S ₃ ) having a small diameter. (C ₃ ) (corresponding to a reverse rotation carrier) is fitted on each side so that they can rotate relative to each other.

The first planetary gear (P ₁ ) (corresponding to the forward planetary gear) that meshes with the first sun gear (S ₁ ) is used as the first carrier (C ₁ ) and the second sun gear (S ₁ ).
₂ ) The second planetary gear (P ₂ ) that meshes with the second carrier (C ₂ )
Third planetary gears (P ₃ ) (corresponding to reverse planetary gears) that mesh with the third sun gears (S ₃ ) are supported by the third carriers (C ₃ ).

The first ring gear (L ₁ ) (corresponding to the normal rotation internal gear ring gear) having internal teeth that mesh with the 1st, _{2nd and} 3rd planetary gears (P ₁ ), (P ₂ ), (P ₃ ), The 2nd ring gear (L ₂ ) and the 3rd ring gear (L ₃ ) (corresponding to the reverse rotation internal gear ring gear) are the 1st, 2nd, 3rd sun gears (S
It is placed on the same axis as ₁ ), (S ₂ ) and (S ₃ ).

The first output gear (O ₁ ) (corresponding to the forward rotation output gear) is provided on each of the outer periphery of the first and second carriers (C ₁ ) and (C ₂ ) and the outer periphery of the third ring gear (L ₃ ). , Second output gear (O ₂ ) and third output gear (O 2
₃ ) (corresponds to the reverse output gear). And, the first driven gear (F ₁ ) (corresponding to the forward rotation driven gear) that supports the output shaft (17) in parallel with the input shaft (1) and the cylinder shaft (4b) and is fixed to the output shaft (17) And a first output gear (O ₁ ), a second driven gear (F ₂ ) fixed to the output shaft (17) and a second output gear (O ₂ ), a third driven gear fixed to the output shaft (17) (F ₃₎ (reverse corresponds to the driven gear) and the third output gear and (O ₃₎ is meshed.

A switching mechanism (R) utilizing a cam is provided on the side opposite to the output shaft (17) with respect to the cylinder shaft (4b), and by this switching mechanism (R), the first ring gear (L ₁ ) One of the 2 ring gear (L ₂ ) and the third carrier (C ₃ ) can be selectively fixed.

As shown in FIGS. 1 and 2, the switching mechanism (R) has a through hole (18) formed in the transmission case (M), and has a first, second, third
The stoppers (19a), (19b), (19c) are inserted, and the lower end portion of the stoppers (19a), (19b), (19c) can project toward the input shaft (1). Then, the urging ball (20) is arranged at the upper end, and the input shaft (1)
When the projecting edge portion (21a) of the shift cam shaft (21) arranged in parallel with the contact with the ball (20), the first, second, third stoppers (19a),
One of (19b) and (19c) is configured to project to the input shaft (1) side.

When the shift cam shaft (21) is slid and the projecting edge portion (21a) contacts the ball (20) of the first stopper (19a), the first stopper (19a) projects and the first ring gear (L) ₁ ) is fixed and comes into contact with the ball (20) of the second stopper (19b), the second ring gear (L ₂ ) is fixed, and comes into contact with the ball (20) of the third stopper (19c) to get the third The carrier (C ₃ ) is fixed. Further, when the projecting edge portion (21a) is not in contact with the ball (20), the first, second, third stoppers (19a), (19b), (19c) are returned upward to release the fixation. It has a spring (22).

With the above structure, as shown in FIG. 1 and FIG.
When the first ring gear (L ₁ ) is fixed by the stopper (19a), the first planet gear (P ₁ ) is interlocked with the rotation of the first sun gear (S ₁ ) and the first ring gear (L ₁ ) is rotated. ) Revolves while revolving around the inner circumference, and the first carrier (C ₁ ) rotates accordingly, and
The first driven gear (F ₁ ) that meshes with the output gear (O ₁ ) and the output shaft (1
Power is transmitted to 7).

When the second ring gear (L ₂ ) is fixed by the second stopper (19b), the second planet gear (P ₂ ) is interlocked with the rotation of the second sun gear (S ₂ ), and the second ring gear (L ₂ ). Revolving around the inner circumference of (L ₂ ), and the second carrier (C ₂ ) rotates accordingly,
Power is transmitted to the second driven gear (F ₂₎ and an output shaft (17) to bite into the second output gear (O _2).

Then, the third stopper (19c) causes the third ring gear.
When (C ₃ ) is fixed, the third planetary gear (P ₃ ) cannot revolve, and only rotates in conjunction with the third sun gear (S ₃ ), and accordingly, the third ring gear (L _3). ) Rotates, and power is transmitted to the third driven gear (F ₃ ) and the output shaft (17) that mesh with the third output gear (O ₃ ).

In this case, when the first ring gear (L ₁ ) is fixed, the output shaft (1
When the second ring gear (L ₂ ) is fixed, high speed forward power is obtained in 7), and when the third carrier (C ₃ ) is fixed, reverse power is obtained. ing.

As shown in FIG. 1, a bevel gear (23) is provided at the end of the output shaft (17) on the side of the continuously variable transmission (A) so that the power transmission shaft (24) can transmit the shifting power to the traveling system. The other end of the output shaft (17) is projected to the outside so that power can be transmitted to a working device (not shown) that requires a working speed corresponding to the vehicle speed. There is. Separately from this, a working device (not shown) that must always maintain a constant working speed
The input shaft (1) is projected to the outside to form a PTO shaft 25 so that power can be transmitted to the shaft.

The mission case (M) is separable from the internal part of the forward / reverse switching device (B) .When the forward / reverse switching device (B) is installed in the mission case (M), the bottom of the split case (m) is The output shaft (17) and so on are sequentially arranged from the above, and then the retaining member (26) is bolted to the split case (m) as shown in Fig. 3 for retaining and positioning them. The split case (m) is joined to the mission case (M) while guiding the input shaft (1) and the like to a predetermined position.

It should be noted that although a number is given in the section of the scope of claims for utility model for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a forward / reverse rotation switching device according to the present invention. FIG. 1 is a vertical sectional side view of the forward / reverse rotation switching device, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. III-I in the figure
It is a II sectional view. (4b) …… input shaft, (17) …… output shaft, (S ₁ ) …… forward sun gear, (S ₃ ) …… reverse sun gear, (C ₁ ) …… forward carrier, (C
₃ ) …… Reverse rotation carrier, (P ₁ ) …… Forward rotation planetary gear, (P ₃ ) ……
Reverse rotation planet gear, (L ₁ ) …… Forward rotation internal ring gear, (L ₃ ) ……
Reverse rotation internal gear ring gear, (O ₁ ) …… Forward rotation output gear, (O ₃ ) ……
Reverse rotation output gear, (F ₁ ) …… Forward rotation driven gear, (F ₃ ) …… Reverse rotation driven gear.

Claims (1)

[Scope of utility model registration request] 1. A forward sun gear (S ₁ ) and a reverse sun gear (S ₃ ) are provided on an input shaft (4b) to which power is transmitted, and the input shaft (4)
The forward rotation carrier (C ₁ ) and the reverse rotation carrier (C ₃ ) are fitted onto b) so as to be relatively rotatable, and the forward rotation planet gear (P ₁ ) that engages with the forward rotation sun gear (S ₁ ) is fixed to the forward rotation. rolling carrier supported on (C _1), the reverse rotation sun gear supports reverse planetary gears bite to (S ₃₎ to (P ₃₎ to said reverse rotation carrier (C _3), the normal rotation planetary gear (P ₁₎ And each of the reverse planetary gears (P ₃ ),
A normal rotation internal gear ring gear (L ₁ ) that engages from the outside and a reverse rotation internal gear ring gear (L ₃ ) are provided, and the normal rotation output gear (O ₁ ) and the reverse rotation internal gear ring are included in the normal rotation carrier (C ₁ ). Each of the gears (L ₃ ) is provided with a reverse rotation output gear (O ₃ ), and the forward rotation driven gear (F ₁ ) and the reverse rotation driven gear (F ₁ ) of the output shaft (17) arranged in parallel with the input shaft (4b). ₃ ), the normal output gear
(O ₁ ) and the reverse rotation output gear (O ₃ ) are engaged with each other, the forward rotation internal tooth ring gear (L ₁ ) is fixed and the reverse rotation carrier (C ₃ ) is in a free rotation state, and The normal rotation internal gear ring gear (L ₁ ) is set to the free rotation state, and the reverse rotation carrier (C ₃ ) is used.
A forward / reverse switching device having a switching mechanism (R) capable of switching between the output state to the output shaft (17) and the fixed state.