JP2794699B2 - Automatic transmission hydraulic control valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control valve for an automatic transmission, and particularly to whether or not a switching position of a switching valve is at an appropriate position when assembly of all parts to a valve body is completed. The present invention relates to a hydraulic control valve for an automatic transmission, which can easily and promptly confirm from outside. [Background Art] In order to run smoothly using the horsepower generated by an internal combustion engine of a vehicle, the engine is rotated at a certain rotation speed or more, and the rotation speed of a drive shaft is changed according to running conditions. It is necessary to adjust. The engine is operated at a rotational speed at which the engine output is maximized in all running states, and a transmission is provided to effectively utilize the maximum output. As this transmission, an automatic transmission that is simple in driving operation, that can smoothly start, accelerate, and decelerate, and that can automatically operate in accordance with running conditions and that can smoothly operate is used. This automatic transmission is a combination of a fluid coupling or a torque converter, an auxiliary transmission, and a shift control device. The operation of these devices is controlled by a hydraulic control valve which is a hydraulic control mechanism having a valve body. FIG. 9 shows a valve body of a hydraulic control valve. That is, the valve body 20 of the hydraulic control valve 18 has a plurality of hydraulic passages and various built-in valves, and opens and closes each hydraulic passage at an appropriate time according to the traveling state of the vehicle, and performs servo and The hydraulic pressure is sent to clutches and the like to control the operation of these devices. The valve body 20 operates the detent lever 30 connected to an operating lever (not shown), and operates the manual valve 24 via the manual side rod 44,
A configuration for supplying and stopping hydraulic pressure to a clutch (not shown) and for supplying hydraulic pressure to the servo valve 26, and moving the servo valve 26 right and left in FIG. The switching between the reverse gear 40 and the forward gear 42 is performed by the shift fork 38 locked by 36. As the structure of the hydraulic control valve, for example,
No. 43854. This publication discloses a fork shaft, a speed change lever, and the like for fitting a sliding fork to a transmission that covers an internal space in which an engagement end of a spool with the sliding fork in a housing forming a hydraulic control valve is to be located. A shift lever shaft for mounting and supporting the gear is provided, simplifying the structure, reducing the number of parts and reducing the number of assembly steps, and assembling the fork shaft and the shift lever shaft integrally with the shift cover to achieve high-precision assembly In addition, inspection and maintenance can be easily performed only by removing the fixing bolts. [Problems to be Solved by the Invention] However, conventionally, when a switching valve or the like is assembled to the valve body 20, the position of the manual valve 24, which is the switching valve connected to the select lever, is set to the hydraulic passage of the valve body 20. On the other hand, since it is not clear what the state is, a check was performed before the cover 54 was attached. For this reason, there is an inconvenience that it is difficult to confirm the switching position of the manual valve 20. Further, the planar portion of the valve body 20 to which the cover 54 is attached requires high accuracy, but has a disadvantage that it is damaged at the time of measurement or the like. Further, due to the miniaturization and layout of the servo valve 26, when the manual rod 44 is positioned above the cover 54, when attaching the cover 54 after adjustment, once the manual rod 44 is pulled out, the cover 54 is attached. And
Thereafter, the manual rod 44 has to be re-attached, and there has been a disadvantage that the working efficiency is reduced. Furthermore, the position of the manual valve 24 and the position of the valve body 20 require an accurate correlation at each shift position. However, due to the variation of parts (the manual side rod 44, the detent lever 30, etc.), the assembly is simply performed. Therefore, it was not accurate, and therefore, it was necessary to increase the accuracy of each part as much as possible. [Object of the Invention] Therefore, an object of the present invention is to eliminate the above-mentioned inconvenience by providing a sight window through which the position of the land of the switching valve can be visually confirmed from the outside of the valve body, so that all parts of the valve body can be removed. After the assembly, the switching position of the switching valve can be checked, the switching valve position can be easily checked, the parts can be easily assembled, and the surface of the valve body that requires high precision is damaged. Another object of the present invention is to provide a hydraulic control valve for an automatic transmission that can prevent the transmission from being performed. [Means for Solving the Problems] In order to achieve this object, the present invention relates to a hydraulic control valve for an automatic transmission which automatically changes a gear ratio according to a running state of a vehicle. The valve body is provided with a switching valve for switching at least between a neutral position, a drive position, and a reverse position, and is provided with an atmosphere-opening passage portion, which is located at a substantially central portion of the atmosphere-opening passage portion at the neutral position and one at the drive position. The switching valve is provided with a land whose end face coincides with one side surface of the atmosphere-opening passage portion and whose other end surface coincides with the other side surface of the atmosphere-opening passage at the reverse position. A viewing window through which the position of the valve land can be visually checked from the outside is provided together with the cover in the atmosphere opening passage portion. [Operation] According to the configuration of the present invention, when the assembly of all parts to the valve body is completed, the position of the land of the switching valve is confirmed from the viewing window, and it is easily determined whether or not the switching position of the switching valve is correct. In addition, it is possible to quickly cope with the failure of the switching position, so that the working efficiency is improved, and it is possible to prevent the surface of the valve body that requires high precision at the time of confirmation from being damaged. Embodiment An embodiment of the present invention will be described below in detail and specifically with reference to the drawings. 1 to 8 show an embodiment of the present invention.
In FIG. 1, 2 is a vehicle, 4 is an internal combustion engine, 6 is a power transmission mechanism, 8 is an automatic transmission connected to the internal combustion engine 4, 10
Is a select lever. That is, the power of the internal combustion engine 4 is
The power is transmitted to the drive wheels 18 via the automatic transmission 8, the propulsion shaft 12, the differential 14, and the drive shaft 16. The automatic transmission 8 is configured by combining a fluid coupling or a torque converter 8a, an auxiliary transmission and a shift control device 8b, and is operated by a hydraulic control valve 18 which is a hydraulic control mechanism shown in FIGS. Controlled. The hydraulic control valve 18 has a plurality of hydraulic passages such as hydraulic passages L1 to L7 and a valve body 20 in which various valves are incorporated. , And sends hydraulic pressure to the clutch 22 and the like of the transmission control device 8b to operate them. That is, as shown in FIGS. 2 to 4, a manual valve which is a switching valve as various valves is provided in the valve body 20.
24 and a servo valve 26 are provided. The manual valve 24 is operated by a detent lever 30 connected to an operating lever 28 connected to the select lever 10, and also supplies and stops hydraulic pressure to the clutch 22 and supplies hydraulic pressure to the servo valve 26. A piston 34 that reciprocates in the cylinder portion 32 is attached to one end 26a of the servo valve 26. The hydraulic passages L1 to L7 are opened and closed by moving the piston 34 right and left in FIG. 2, whereby the servo valve 26 is operated left and right to move the other end of the servo valve 26 to the other end.
In this configuration, switching between the reverse gear 40 and the forward gear 42 is performed via a shift fork 38 locked to the fitting pin 36 at the fitting 26b. The detent lever 30 and the manual valve 24,
They are connected by a manual rod 44. The moderation of the detent lever 30 is maintained by the plunger 46 and the spring 48. Reference numeral 50 denotes a rod component parking guide, and the rod component parking guide 50 is used when the select lever 10 is at the parking position. In the valve body 20, when the switching position is in the neutral position (N), the reverse position (R), or the driving position (D), a part of the manual valve 24, which is the switching valve, can be seen from the outside. A viewing window 56 is provided in the open-to-atmosphere passage portion 52 of one of the hydraulic passages as a check portion that can be visually checked together with the cover 54. That is, the viewing window 56 allows the one-side face 24C-1 of the land 24a of the manual valve 24 and the completion of assembling of all parts such as the manual valve 24 and the servo valve 26 which are switching valves of the parts to be assembled to the valve body 20. By measuring the distance between the other end surface 24C-2 and the one side surface 52C-1 and the other side surface 52C-2 of the atmosphere opening passage portion 52, it is determined from the outside whether or not the switching position of the manual valve 24 is at an appropriate position. It is possible to make a determination. Next, the operation of this embodiment will be described. Each part to the valve body 20, that is, the manual valve 24
When the servo valve 26 and the like are assembled and completed,
As shown in FIG. 6, when the select lever 10 is set to the neutral position (N), the land 24a of the manual valve 24 is located substantially at the center of the air release passage portion 52. When viewed from the cover 54 and the viewing window 56, one end surface 24C-1 of the land 24a of the manual valve 24 and one side surface 52 of the atmosphere opening passage portion 52 are provided.
The distance S1 between C-1 and the distance S2 between the other end surface 24C-2 of the land 24a of the manual valve 24 and the other side surface 52C-2 of the air release passage 52 are measured. And these distances S1, S2 are, for example,
2. Judge whether it is within the standard value of 96 ± 5mm. Then, when the select lever 10 is set to the drive position (D) as shown in FIG. 7, the other end surface 24C-2, which is one end surface of the land 24a of the manual valve 24, and one side surface 52C of the atmosphere opening passage portion 52. It is determined whether or not -1 matches. At this time, when the other end surface 24C-2 of the land 24a of the manual valve 24 and the one side surface 52C-1 of the air release passage portion 52 match or are within the standard value, it is determined that the manual valve 24 is at an appropriate position. I do. When the select lever 10 is set to the reverse position (R) as shown in FIG. 8, one end face 24C-1, which is the other end face of the land 24a of the manual valve 24, and the atmosphere opening passage 52 are connected to the other side face 52C. It is determined whether or not -2 matches.
At this time, one end face 24C of the land 24a of the manual valve 24
If -1 and the other side surface 52C-2 of the atmosphere opening passage portion 52 match or are within the standard values, it is determined that the manual valve 24 is at the appropriate position. Check the switching position of the manual valve 24 as described above, and if each measured value does not satisfy the standard value, it is determined that the mounting position of the manual valve 24 is defective. The position of the manual valve 24 is adjusted by bending the side rod 44. If there is a deviation between each hydraulic passage of the valve body 20 and the manual valve 24 as described above, the hydraulic pressure is likely to leak,
The supply of the line pressure cannot be performed as expected, and not only can the operation of the servo valve 26 not be performed quickly, but also the hydraulic pressure supplied to the clutch 22 decreases. Therefore, according to this embodiment, the switching position of the manual valve 24 can be easily confirmed at the completion of assembly of all parts to the valve main body 20, so that it is possible to quickly confirm the quality of the assembled state of each part. In addition, it is possible to quickly cope with the failure of the switching position, and it is possible to improve the efficiency of the assembling work. When checking the switching position of the manual valve 24, the cover 54 is already attached to the flat portion of the valve main body 24, so that the flat portion is prevented from being damaged, and the flat surface of the valve main body 20 requiring high precision is prevented. There is no danger of impairing the accuracy of the part. Further, since the position of the manual valve 24 is checked after all the parts are assembled to the valve body 20, the layout is less restricted and the parts can be reduced in size. Furthermore, according to this embodiment, it is not necessary to make the accuracy of each part so high. If the switching position of the manual valve 24 is shifted at the time of confirmation, the manual valve 24 is bent by bending the manual rod 44 or the like. The position can be easily adjusted, which is practically advantageous. [Effects of the Invention] As is apparent from the detailed description above, according to the present invention, the valve body of the hydraulic control valve is provided with at least a switching valve that switches between a neutral position, a drive position, and a reverse position, and an air opening passage. The neutral position is located substantially at the center of the open-to-atmosphere passage, one end face of the drive position corresponds to one side of the open-to-atmosphere path, and the other end face is located at the reverse position at the other end of the open-to-atmosphere path. A land corresponding to the side surface is provided on the switching valve,
The valve body is equipped with a cover in the open-to-atmosphere passage that allows the position of the land of the switching valve to be visually confirmed from the outside when the assembly is completed, so the position of the land of the switching valve can be confirmed from the outside. The switching position of the switching valve can be confirmed easily and quickly, and the failure of the switching position can be dealt with promptly, improving the assembly work efficiency. In addition, a cover is attached to the flat part of the valve body at the time of confirmation. Therefore, it is possible to prevent damage to a flat portion of the valve body that requires high precision, and to reduce the size of components without any layout restrictions. Further, even if the precision of each part of the valve body is not so high, it is only necessary to finally adjust the connecting rod at the viewing window by bending the connecting rod or the like, so that the adjustment can be performed easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 8 show an embodiment of the present invention, FIG. 1 is a schematic view of a vehicle, FIG. 2 is a partial longitudinal sectional view of a valve body of a hydraulic control valve, FIG. Is a partial cross-sectional view of the valve body of the hydraulic control valve,
Fig. 4 is a hydraulic circuit diagram of the valve body, Figs. 5 and 6 are schematic diagrams showing the position of the manual valve when the select lever is in the neutral position, and Fig. 7 is a manual valve when the select lever is in the drive position. FIG. 8 is a schematic diagram showing the position of the manual valve when the select lever is set to the reverse position. FIG. 9 is a partial longitudinal sectional view of a valve body of a conventional hydraulic control valve. In the figure, 2 is a vehicle, 4 is an internal combustion engine, 8 is an automatic transmission, 10 is a select lever, 18 is a hydraulic control valve, 20 is a valve body, 22 is a clutch, 24 is a manual valve, 26 is a servo valve, and 38 is a servo valve. Shift fork, 40 is reverse gear, 42
Is a forward gear, 44 is a manual side rod, 52 is an atmosphere opening passage, 54 is a cover, and 56 is a viewing window as a confirmation unit.

Claims (1)

(57) [Claims] In a hydraulic control valve of an automatic transmission for automatically changing a gear ratio according to a traveling state of a vehicle, a valve body of the hydraulic control valve is provided with a switching valve that switches at least between a neutral position, a drive position, and a reverse position. At the neutral position, one end face coincides with one side face of the atmosphere-opening passage portion at the drive position, and the other end surface is located at a substantially central portion of the atmosphere-opening passage portion at the neutral position. A land corresponding to the other side surface of the atmosphere-opening passage portion is provided on the switching valve, and a view window through which the position of the land of the switching valve can be visually confirmed from the outside when the assembly is completed is provided in the valve-opening passage portion on the valve body. A hydraulic control valve for an automatic transmission, which is provided together with a cover.