JPS6067227A - Transferring device for four-wheel drive power transmission - Google Patents

Abstract

PURPOSE:To improve response, make a unit small, and facilitate maintenance, by installing the hydraulic chamber of a hydraulic servo device for a four-wheel drive transfer gear, within an extension housing on one end part of a transmission case. CONSTITUTION:When four-wheel driving is carried out, a hydraulic pressure control valve 34 is shifted from an oil discharging position to an oil feeding position, oil is sent to a cylinder chamber 17 through passages 43, 44, 37, etc., and a piston 14 is moved leftward, pressing a coil spring 24. Then, a clutch sleeve 11, together with a spring 12, connecting sleeve 18, and a bearing 22, is moved leftward, i.e., toward a clutch member 8. An internal gear 12 hits against the chamfered part 7a of the clutch member 8, and is enagaged with it, causing a connecting shaft 2 to be directly connected to an output shaft 3, to carry out four- wheel driving.

Description

[Detailed Description of the Invention] The first sister of the first generation, the first sister of the first generation! The present invention relates to a four-wheel drive power transmission device used in a vehicle such as an automobile, and more particularly to a first to second locking device including a hydraulically actuated clutch.

BACKGROUND OF THE INVENTION Four-wheel drive power transmission devices used in vehicles such as automobiles generally select the power of the prime mover and transfer the power to the front wheels, which are the drive wheels.
= is equipped with a transfer device including a clutch that selectively connects the output shaft of the transmission and the wheel drive shaft to selectively transmit the transmission to the rear wheels.

It has been proposed that the clutch of the above-mentioned transfer device is switched and driven by a hydraulic servo device, and the four-wheel drive is switched by hydraulic control, especially when the transmission is a hydraulically controlled automatic transmission. In order to use the hydraulic pressure of the automatic transmission as the hydraulic pressure to be supplied to the hydraulic servo device, a dedicated hydraulic pressure supply source is required. be exposed.

However, the oil J and E IIIJ control valves that control the supply and discharge of oil to and from the hydraulic chamber of the hydraulic servo device are combined with a hydraulic control device for controlling the first speed of an automatic transmission. If it is installed at the bottom of the transmission case, it will control the hydraulic pressure of the hydraulic servo device of the transmission case, which is installed in the extension housing connected to one end of the transmission case. The length of the oil passage connecting the chamber and the hydraulic control valve becomes longer, that is, the length of hydraulic pressure transmission between the hydraulic control valve and the hydraulic servo device becomes longer, and the &l+pressure for the operation of the hydraulic pressure M III valve increases. The operation of the control device is delayed, making it difficult to obtain the responsive switching performance of the control device.

Purpose of the Invention The present invention provides a 1C hydraulically controlled four-wheel drive system that has excellent switching response, has a high degree of freedom in designing a horizontal T1 that is simple and compact, and has excellent assembly workability and maintenance workability. The purpose of the present invention is to provide a transfer device for a power transmission device.

According to the present invention, the output shaft of the transmission is incorporated into an extension housing attached to one end of the transmission case. 11@ It has a clutch that selectively connects the drive shaft, and a hydraulic 4-novo device that connects and disconnects the clutch, and the oil is installed in a part of the upper extension housing. The hydraulic chamber has a hydraulic chamber defined in cooperation with the transmission case, and the hydraulic chamber is attached to one end of the transmission case.
- Achieved by a transformer seven-door device of a four-wheel drive power transmission device configured to supply and discharge hydraulic pressure through an oil passage formed in the one end of the transmission case and the extension housing. .

Effects of the Invention In the transfer equipment of a four-wheel drive power transmission device according to the present invention, a hydraulic control valve is provided at the connection end of the transmission case with the 1st extension housing housing the 1st to 1st extension housings that incorporate the transfer device, The hydraulic pressure control valve and the hydraulic chamber of the hydraulic servo device are directly connected through the oil passage connected to the connection end of the transmission case and the tension housing, so that the hydraulic pressure control valve and the hydraulic pressure The length of the oil passage connecting the chamber is short, so that the C hydraulic reservo is operated relatively quickly in response to the operation of the hydraulic control valve, and the transfer device is switched with good response. In addition, since the hydraulic control valve is provided at the connection end of the transmission case with the extension housing, it can be easily assembled and removed with the extension housing removed from the transmission case, and its maintenance is also easy. Work is done easily.

DESCRIPTION OF EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings below.

The attached figure is a longitudinal sectional view showing one embodiment of a seven-door transformer device for a four-wheel drive power transmission device according to the present invention. In the figure, -C11 indicates an extension housing, and one end of the extension housing is fixedly connected to one end of the 1-transmission case 40 by a not-shown port 1-. ”-The xdensidine housing 1 is (-The transmission case 40
A connecting shaft 2 is drivingly connected to one end of an output shaft of a gear transmission incorporated in the drive unit, and a rear wheel drive unit is drivingly connected to a rear wheel (not shown)! ! 'llll 3 and 3 are on the same axis.

The connecting shaft 2 has an end shaft portion 4 that engages with a bearing hole 5 provided extending in the axial direction at one end of the rear wheel drive shaft 3, and the end shaft portion is connected to the rear wheel drive shaft 3. The rear wheel drive shaft 3 is rotatably supported by the suspension housing 1 by means of a radial ball bearing 6.

The connecting shaft 2 is a clutch portion that has external teeth 7 at the end adjacent to the one end of the rear wheel drive shaft 3! It has A8 integrally. Rear wheel drive! The IJ shaft 3 integrally has a clutch portion 10 having external teeth 9 at one end thereof.

The outer teeth 7 and 9 (J27 have pitch circles that are concentric and have the same diameter, and the outer teeth 9 have pitch circles that are the same diameter as the inner teeth 1 of the clutch sleeve 11.
2 is 1 @ together. The gangway sleeve 11 has internal teeth 1
The cutting position where 2 meshes only with the outer tooth 9 and the inner 112 is the outer f!
It is HUGJ movably in the axial direction of the rear wheel drive shaft 3 between the connection position where it meshes with either of l119 and 7,
The connecting shaft 2 and the rear wheel drive shaft 3 are connected in a rotational power transmission relationship when the connecting shaft 2 is moved to the left in the figure from the illustrated position and is in the connecting position.

Engagement ends of the internal teeth 12 of the clutch sleeve 11 and the external teeth 7 of the clap member 8 each have a zigzag engagement portion 12a.
and 7a are listed as the installation number. .

An inner race 22a of a radial ball bearing 22 is fixed to the outer periphery of the clutch sleeve 11 by a collar 29 and a snap ring 30.

A connecting sleeve 18 is fixed to the outer periphery of the outer race 22b of the radial ball bearing 22 with a snap ring 31. That is, the connection sleeve 18 is attached to the clutch sleeve 11 by means of a radial ball bearing 22 so as to be rotatable but fixed in the axial direction.

The extension housing 1 defines an annular cylinder bore 13 concentric with the connection shaft 2 and the rear wheel drive shaft 3 on the inside thereof by an outer cylinder part 1a and an inner cylinder part 1b which are concentric with each other; The annular piston 14 for the oil IF servo is @ f7! They are engaged so that they can move in the h direction. The piston '14 is made liquid-tight by oil seals 15 and 16 on one side, that is, on the side of the clap member 10 (the right side in the figure) compared to the clap member 8, and encloses an LC cylinder chamber (hydraulic chamber) 17. It is established. The piston 14 has a protruding portion '1 on the other side that protrudes from the inner cylinder portion 1b in the direction of the axis lj.
4a, and the protruding portion is axially transferred to the outer circumference of the connecting sleeve 18 at the inner circumference! FJJ iiJ Noh ni 1
J5 is in contact with the door, and an annular stopper plate 2o is fixed to the pole 1-19 at the tip of the protrusion.Although not shown in the figure, the piston 14
The piston is rotated 11- by the engagement of the two projections.

Each of the stopper plates 1 to 20 partially has a portion in the circumferential direction that faces the end of the piston 14 at a predetermined interval in the axial direction to define a gap, and the stopper plate and the piston 14 The connection sleeve 1 is placed in the g11 gap between
Flange piece part 1 partially extending from 8 in the circumferential direction
8a is located so as to be movable in the axial direction. 7 ring piece portion 18a and a bottomed hole 14b provided in the piston 14
A buffer compression coil spring 21 is disposed with a predetermined preload between the buffer compression coil spring 21 and the bottom of the buffer 'BE, and the buffer compression coil spring 21 biases the piston 14 and the connecting sleeve 18 away from each other in the axial direction. ing. That is, the piston 14 and the connecting sleeve 18 are relatively moved 4q in the axial direction by a predetermined distance against the spring force of the buffer compression coil spring 21. The permissible relative movement m in the axial direction between the piston 14 and the connecting sleeve 18 is the piston 1
When the buffer compression coil spring 21 is compressed by a predetermined amount, the tip of the piston 14 directly contacts the 7-ring piece 18a of the connecting sleeve 18, which is shown on the left in the figure. It is designed to be driven directly in the direction of the engine, giving it a load of 1g.

In order to absorb misalignment between the screw (hen 14) and the output shaft 3, a radial gap 25 is provided at the fitting portion of the inner race 22b of the radial ball bearing 22 and the clutch sleeve 11 (
I'm getting fucked.

Inside the first extension housing 1, an annular spring retainer 23 is fixed to a snow ring 31. A return compression spring 24 is installed with a predetermined preload between the bottom of the bottomed hole 14c provided in the piston 14 and the return compression coil. The spring 24 is the piston 14
is urged rightward in the figure, that is, in a direction from the connection position toward the cutting position. The return compression coil spring 24 is made of a spring weaker than the buff 1 compression coil spring 21, and its preload is set to be smaller than the preload of the buffer compression=1 ile spring 21.

The -CH1 portion of the transmitter case 40, that is, the connecting end with the extension housing 1 has a hydraulic pressure V.
- The hydraulic control valve 34 for engine control is removed ('I GJ).
Hydraulic pressure is supplied to the IC from a hydraulic power source (not shown) through an oil passage (not shown) formed in the transmission case 40, and the boat 35 is connected to the hydraulic power source and the oil drain boat by manual switching or electromagnetic switching. An oil passage 42 is formed at one end of the connection end of the transmission case 40 and directly connected to the SJ boat 35.

The oil passage is! - The oil passages 43 and 44 provided at the connecting end of the transmission gear 40 are communicated with a connecting boat 45 opened at the end surface where it joins the extension housing 1.
J3 has a connection boat 36 that is aligned with the connection boat 45 on the joint end surface with the transmission case 40, and the connection boat I- is provided in the transmission housing 1 and connected to the cylinder chamber 17 through oil passages 37 and 38. is connected to.

As shown in the figure, when one end of the extension housing 1 is connected to one end of the transmission case 40, the connection boats 3G and 45 are aligned and communicate with each other, whereby ports 1-35 of the hydraulic control valve 34 are oil passage 42, 43, 44, connection boat 45, 36, oil passage 3
It is connected to the cylinder chamber 17 through 7.38. In the figure, numerals 39 and 46 are blind plugs that close the two holes of the oil passages 38 and 43, respectively.

Next, the operation of the above-mentioned 4M/X transfer device will be explained.

ff! Figure 1 shows a state in which the hydraulic control valve 34 is in the oil drain position, no hydraulic pressure is supplied to the cylinder chamber 17, and the clutch sleeve 11 is in the disconnected position on the right side together with the piston '14 and the connecting sleeve 18. It shows. In this state, when the oil pressure control valve 34 is switched from the oil drain position to the oil supply i1x position to perform four-wheel drive, the oil pressure control valve 34
The oil 11 supplied to the oil passage 4 from the boat 35
2.43.4.4, connection boat 45.36, oil passage 37
．． It is sent to the cylinder chamber 17 via 38. Cylinder chamber 1
When hydraulic pressure is supplied to 7, the piston 14 moves to the left in the figure against the spring force of the return compression coil spring 24,
Accompanying this, the clutch sleeve 11 moves to the left in the figure, that is, in the axial direction toward the clutch member 8, together with the buff 1 compression coil spring 2'1, the connection sleeve 18, and the radial ball bearing 22. When the chamfer part 12a of the internal tooth 12 collides with the chamfer part 7a of the internal tooth 7 of the clutch member 8 due to the axial movement of the clutch sleeve 11, the clutch sleeve 11 cannot move any further to the left in the figure, but the piston 14 is subsequently moved to the left in the figure by the hydraulic pressure supplied to the cylinder chamber 17, so that the piston 14 moves to the other side in the figure with respect to the connecting sleeve 18 while compressing the buffer compression coil spring 21. When the clutch sleeve 11 rebounds due to the chamfer portion 12a of the internal teeth 12 of the clutch sleeve 11 colliding with the chamfer portion 7a of the external teeth 7 of the clutch member 8, m rAjj is applied to this via the radial ball bearing 22.
The connecting sleeve 18, which is connected so that it cannot move in the direction t, moves to the right in the figure with respect to the piston 14 while compressing the buffer compression coil spring 21. Due to the relative rotation between the connecting shaft 2 and the output shaft 3, the chamfer portion 12a of the internal teeth 12 of the clutch sleeve 11 and the external teeth 7 of the clutch member 8
When the buff 1 part 7a of the buff 11 is engaged, the clutch sleeve 11 moves to the left in the figure at high speed together with the connecting sleeve '18 and the radial ball bearing 22 due to the spring force of the buff buff compression coil spring 21 which is being compressed and deformed. , the external teeth 12 and the internal teeth 7 engage in meshing engagement. When the external teeth 12 and the internal teeth 7 mesh and engage, the rotational power of the connecting shaft 2 is transmitted to the Claratis 1 no. It is transmitted from the clutch sleeve 11 to the output shaft 3 through engagement with the outside @9. That is, four-wheel drive is started.

As mentioned above, even after the transmission of rotational power has started through the clutch sleeve 11, the clutch sleeve 11 is driven to the left at one stroke in order to complete the engagement between the internal teeth 12 and the external teeth 7. At this time, the internal teeth 12 and external teeth 7 are pressed against each other by the rotational power transmitted from the connection shaft 2 to the output shaft 3 via the lap sleeve 11, which is necessary to avoid moving the clutch sleeve 11 to the left in the figure. Therefore, at this time, the piston 14 compresses the buffer compression coil spring 21 while compressing the connection sleeve 18.
In contrast, the permissible relative movement amount S1 between the piston 14 and the connecting sleeve 18 is the entire stroke S1 of the piston 171! Due to its smaller size, the piston directly contacts the clutch piece 18a of the connecting sleeve 118 with its tip end surface, and directly drives the connecting sleeve 18 to the left in the figure, thereby causing the clutch sleeve 11 to move toward the radial pole. Together with the bearing 22, it is driven to the left in the figure, and when it is located at the connection position, the engagement between the inner teeth 12 and the outer fJ7 is completed.

When the hydraulic control valve 34 is switched from the oil supply position to the oil drain position in order to cancel the four-wheel drive, the cylinder chamber '17 is moved to the oil passage 38.
．． 37, a connection boat 36, 45, an oil passage 44, 43, and a boat 42 to connect to an oil boat (not shown) of the hydraulic control valve 34, and the hydraulic pressure in the cylinder chamber 17 is discharged. The hydraulic pressure in the cylinder chamber 17 is released 111, and the spring horn of the return compression coil spring 24 causes the piston 1 to
4 is moved to the right (as shown in the figure), the connection sleeve 18 is pushed to the right in the figure by the stopper plays 1 to 20, and as a result, the clutch sleeve 1-1 is pushed to the right in the figure along with the radial pole bearing 22. , the inner teeth 12 are separated from the engagement of the outer teeth 7 of the clutch portion 8. As a result, the connecting shaft 2 and the rear wheel drive shaft 3 are separated, and the four-wheel drive is released. .

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto.
It will be apparent to those skilled in the art that numerous other embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

The attached drawings show four-wheel drive power transmission devices according to the present invention.
FIG. 2 is a vertical cross-sectional view showing one embodiment of the transfer device. '1...1 tension housing, 2...connection shaft. 3... Rear wheel drive shaft, 4... Short shaft portion, 5... Bearing hole, 6... Radial ball bearing, 7... External tooth, 8...
・Clutch member, 9... External teeth, 10... Clutch member, 11... Clutch sleeve, 12... Internal teeth, 1
3...Cylinder bore. 14...Piston, 15.16...A seal,
17... Cylinder chamber, 18... Clutch sleeve,
19... Bolt, 20... Stopper plate, 21
...Buffer compression coil spring, 22...Radial pole bearing. 23... Spring retainer, 24... Return compression -1
Ile spring, 25...Gap, 29...Color, 30~
32... Snap ring, 34... Hydraulic control valve, 3
5...Bo 1-. 36...Connection boat, 37.38
...Oil passage, 39...Blind plug, 40...Transmission coos, 41...Output shaft, 42-44...
Oil passage, 45...Connection port I-, 46...Blind plug Patent applicant 1-Yota Jidosha Co., Ltd. Representative Patent attorney Masaki Akashi

Claims (1)

[Claims] A clutch that is attached to one end of the transmission case and that is incorporated in the cut-out extension housing and that selectively connects the output shaft of the transmission and the wheel drive shaft, and that connects and disconnects the clutch. a hydraulic servo device, the hydraulic servo device has a hydraulic chamber defined in a part of the extension housing in cooperation with the extension housing, and the hydraulic chamber has a hydraulic chamber at the one end of the transmission case. A transfer of a four-wheel drive power transmission device configured such that hydraulic pressure is supplied and discharged from a hydraulic control υ11 valve having a mounting number through an oil passage formed in the one end of the transmission case and the extension housing. Device.