JPS6280335A - Accumulator device in automatic speed change gear - Google Patents

Abstract

PURPOSE:To aim at miniaturizing an accumulator device in an automatic speed change gear for a front-engine-front-drive vehicle and at optimizing the tuning of shocks upon gear shaft, by using an accumulator assembly in the above- mentioned accumulator device, which is separated from a transfer axle casing. CONSTITUTION:An accumulator device is composed of an accumulator housing 32 incorporating therein accumulators 32b, 32c, 32d..., and a plate 30 and a cover 25 which define an oil passage 26 in combination. Further, there is provided an accumulator assembly 23 in which the housing 32 is integrally secured to the cover 25 with the plate 30 being held therebetween. Further, a transfer axle casing 6 is formed with a joint surface 6e in which the opening 39a of an oil passage 39 extending from a valve body 7 is formed, and then the accumulator assembly is coupled to the joint surface 6e so that the accumulator device may be obtained. Further, if the inner diameter of the accumulator assembly 23 or the urging force of a spring disposed therein is changed without changing the casing 6 thereof, it is possible to optimize the turning of gear shift shocks.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field
(Front engine/front drive) cars and applicable F
The present invention relates to an accumulator device in an automatic transmission for a four-wheel drive vehicle based on -F.

(B) Conventional technology In general, an automatic transmission is composed of a plurality of planetary gear units, and a large number of clutches and brakes (frictional engagement elements) are arranged to control the operation of each gear of these planetary gear units. .

Furthermore, these J! In order to reduce shift shock by smoothing the supply of hydraulic pressure to predetermined frictional engagement elements of the J frictional engagement elements, such as the forward clutch (C□), direct clutch (C2), and 2nd brake (B2), An accumulator is installed.

Conventionally, these accumulators are constructed by directly machining the accumulator inner diameter into a case member such as a transaxle case, and by assembling a spring and a piston into the machined hole.

→ Problem to be solved by the invention Therefore, it is necessary to design an accumulator part in the case in advance, and since these accumulators occupy a considerable part of the automatic transmission space, it is necessary to design each clutch and the accumulator part in advance. Among the brakes (frictional engagement elements), there may be cases where it is inappropriate to install one cume rake for all the engagement elements in which it is desired to obtain an accumulation effect. This tendency is particularly noticeable in automatic transmissions for F/F vehicles that require downsizing. For example, when an underdrive mechanism or an overdrive mechanism is attached to achieve 4 speeds, these 4 speeds are unavoidable.
The accumulators of the speed clutch (C3) and brake (B4) may be omitted. In addition, since the conventional accumulator mentioned above is constructed integrally with the case, it is difficult to set a large number of accumulator inner diameters depending on the engine characteristics.
This is difficult due to processing costs, and it is often necessary to use accumulators that do not match well with engine characteristics, which is one of the factors that prevents optimization of transmission shock tuning.

(,-) Sakaki Means for Solving the Problem The present invention aims to solve the above-mentioned problems, and as shown in FIG. 1, a predetermined number of accumulators 32 b, 32 c, An accumulator consisting of an accumulator housing 32 having 32 d..., a plate 30 and a cover 25 that constitute an oil passage 26 by joining each other, and the housing 32 is integrated with the cover 25 by sandwiching the plate 30 between them. An assembly 23 is provided. On the other hand, a joint surface 6e extending from the valve body 7 and having an opening 39a for the oil passage 39 is formed on the transaxle case 6, and the accumulator assembly 2 is coupled to the joint surface 6e to form an accumulator in an automatic transmission. Configure the device.

(e) Operation Based on the above-described configuration, each accumulator 32b, 32c, 32d, etc. is set so as to have an optimal accumulation characteristic corresponding to the engagement characteristic and load torque characteristic of each frictional engagement element, and these accumulators are The assembly 23 having the transaxle case 6 is coupled to the transaxle case 6 and assembled into an automatic transmission. As a result, when the predetermined friction engagement element engages based on the operation of the predetermined valve in the valve body 7, the oil passage 3
Supply pressure is also sent to a predetermined accumulator through 9°26, and the predetermined F! Engage the J friction engagement element.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 3, the automatic transmission 1 for an F-F engine vehicle includes a torque converter section 2, an automatic transmission section 3, and a differential section 5, and includes a case body 6a, an axle housing 6b, a cover 6c, etc. The valve body 7 is housed in a transaxle case 6 having a divided structure, and a valve body 7 is installed above the case 6.

The L-lux converter unit 5 is composed of a torque converter 10 equipped with a lock-up clutch 9, and the rotation of the input member 11 is inputted directly to the automatic transmission unit 3 via the oil flow of the torque converter 10 or by the lock-up clutch 9. The signal is transmitted to the shaft 12. The automatic transmission section 3 also includes a front planetary gear unit 1-13, a rear planetary gear unit 14, and an underdrive (U/D) planetary gear unit 15, and a forward clutch C1 and a direct clutch to control each planetary gear unit. C2, 2nd: +-strike brake B1.2n
d brake B, 1st & Rev brake B3, U/D direct clutch C3, U/D brake B4, one-way clutch F2. F2. F is installed.

Then, these clutches, brakes, and one-way clutches are controlled as appropriate, and the rotation of the input shaft 12 is adjusted to four forward speeds, four forward speeds, and one-way clutches.
The speed is changed to reverse first speed and transmitted to the differential drive pinion 17. In addition, the differential section 5
has a ring gear 20 that meshes with the drive pinion 17 and is fixed to the differential case 19;
0 rotation is transmitted to the left and right front axle shafts 22j' and 22r via the differential gear 21.

Further, the valve body 7 is equipped with a large number of valves including a throttle valve 24, a lock-up solenoid valve, and two speed change solenoid valves.
Also, a large number of oil passages are formed which communicate these valves as appropriate and communicate with the clutches and brakes of the automatic transmission section 3 as well as an accumulator which will be described later.

As shown in FIGS. 1 and 2, an accumulator assembly 23 according to the present invention is disposed at the upper part of one side of the transaxle case 6. The accumulator assembly 23 has an accumulator cover 25, and the cover 25 has a number of oil grooves 2 as shown in detail in FIG.
6a... are formed, and are fixed to the joint surface 6e of the case 6 with bolts 27... via a gasket 29a. Further, an accumulator plate 30 is fixed to the accumulator cover 25 with bolts 31 via a gasket I-29b, and an accumulator housing 32 is fixed with bolts 33 so as to sandwich the plate 30 and gasket I-29c. ing. Further, the accumulator housing 32 includes clutches C, ,C.
, , C, and brake B2. A total of 5 accumulators 32a for B4.

32 b, 32 c, 32 d, and 32 e are formed, and a spring 34 is compressed between each of these accumulators and the bottom surface thereof, and an accumulator piston 35 is fitted in an oil-tight manner. An accumulator chamber 36 is formed between the plate 30 and the C2 accumulator 32b.

A back pressure chamber 37 is formed in the C3 7 acumulator 32c and the 82 acumulator 32d. In addition, in FIG. 1, 6' is a partition wall of the case 6 that supports the input shaft 12 portion;
6d is the valve body joint surface on the upper surface of the case 6. Further, 39 is an oil passage formed in the case 6, and 40 is the oil passage 39.
A rubber gasket 41 sealing the opening 39a of the plate 30 and the hole 30a of the plate 30 is an O-ring.

The present accumulator assembly 23 is assembled as follows.

First, attach the accumulator plate 30 to the gasket 29b
The oil passage 26 is formed by sandwiching and fixing to the accumulator cover 25 with bolts 31 and closing the oil groove 26a with the plate 30. On the other hand, clutches or brakes C1 to C3, B, B4 corresponding to each of the accumulators 32a to 32e of the accumulator housing 32, respectively.
The piston 35 is fitted through a spring 33 that matches the engagement characteristics of the plate 30 in advance.
The housing 32 is fixed to the cover 25 to which the gasket 29c is fixed. As a result, each oil #526
-... communicates with the seven storage chambers 36 of each of the accumulators 32a to 32e through holes 30b formed in the housing 30, and through holes 30c, holes 32f formed in the housing 32, and oil passages 32g. Back pressure chamber 3 as appropriate
A circuit communicating with 7 is constructed. Furthermore, in the state B, the housing 32 and the plate 30 are integrated so that each hole 30a of the plate 30 fits into the opening 39a of each oil passage 39 formed in the case 6. The cover 25 is fixed to the side surface of the case 6 using the gasket I' 29a and the port 1-27. This results in
The accumulator assembly 23 is assembled to the automatic transmission 1.

Based on the control of a predetermined valve in the valve body 7, when a predetermined clutch or brake is engaged, the hydraulic pressure supplied to the predetermined clutch or brake is oil@39, hole 30a,
The oil is sent to the accumulator chamber 36 of a predetermined accumulator via the oil passage 2G and the hole 30b, and further to the hole 3 in some cases.
The pressure is sent to the back pressure chamber 37 through the 0c1 hole 32f and the oil path 32f, and each clutch or brake is engaged with an appropriate accumulator pressure corresponding to the engagement characteristics (and load torque in some cases) of each clutch or brake. do.

In the above embodiment, the accumulators 32a to 32e are integrally formed in the accumulator housing 32, but this is divided into a plurality of groups, and each accumulator is further divided and attached to the cover 25. It may be configured as follows.

Moreover, although the oil groove 26a is formed in the cover 25 to constitute the oil passage 26, the oil passage may be constituted by forming an oil groove in the plate 30.

(g) As described in detail, according to the present invention, the accumulator assembly 23 is made separate from the axle case 6 for the accumulator assembly 6.
Even if the automatic transmission unit 3 is changed, for example from 3 forward speeds to 4 forward speeds, the accumulator assembly 23 can be changed without causing any installation problems without significantly changing the entire lance axle. It is enough to assemble it into
Even in an F-F automatic transmission that requires downsizing, an accumulator can be easily installed in correspondence with a frictional engagement element that requires an accumulator. Furthermore, without changing the case 6 of the accumulator assembly 23,
Since its inner diameter and spring biasing force etc. can be easily changed, a wide variety of accumulators can be prepared to suit various engine characteristics, and transmission shock tuning can be optimized at low cost. . Furthermore, even if there is a defect in the inner diameter of the accumulator, there is no need to replace the entire transaxle case 6, and it is sufficient to simply replace the accumulator assembly 23, reducing costs. Therefore, the accumulator and valve body 7 can be easily assembled to the transaxle case 6, and maintenance and serviceability can also be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the line II in FIG. 2 showing an accumulator device according to the present invention, and FIG. 2 is a front view thereof. FIG. 3 is an overall sectional view showing an automatic transmission to which the present invention can be applied. 1. Automatic transmission, 2. Torque converter section, 3
...Automatic transmission section, 5..Differential section, 6..Transaxle case, 6e.
・Joint surface, 13-15...planetary gear 1, , c1-c3. B,~B4・Frictional engagement element (clutch, brake), 23・Accumulator assembly, 25・Plate, 26 Oil path,
3o... play +-, 30a p30b, 30c hole, 32, accumulator housing, 328
~32e...Accumulator, 36...Accumulator chamber, 37 Back pressure chamber, 39 Oil passage, 39
a...Opening.

Claims (2)

[Claims] (1) It has a transaxle case housing an automatic transmission section consisting of a planetary gear unit controlled by each frictional engagement element, and a valve body having a large number of valves is coupled to the case. In an automatic transmission, an accumulator housing comprising a predetermined number of accumulators, a plate and a cover that form an oil passage when joined together, and the housing is integrated with the cover by sandwiching the plate. An accumulator device for an automatic transmission, comprising: a joint surface having an opening for an oil passage extending from the valve body; and a joint surface having an opening for an oil passage extending from the valve body, and the accumulator assembly is coupled to the joint surface. (2) The accumulator device for an automatic transmission according to claim 1, wherein the valve body is coupled to an upper portion of the transaxle case.