JPH07259972A - Abnormal sound preventing device for transmission - Google Patents

Abstract

PURPOSE:To prevent abnormal sound by actuating a brake so as to retard the speed of a driven side gear when the engine speed is idle while the temperature of lubrication oil in the transmission is higher than a predetermined value so that abnormal sound is likely to occur. CONSTITUTION:An oil temperature sensor 17 detects a temperature of lubrication oil in a transmission casing 11 and delivers the same to a controller 19. Further, an engine speed sensor 18 detects a speed of an engine and delivers the same to the controller 19. In view of these detection results, the controller 19 determines that the engine speed is idle while the temperature of the lubrication oil exceeds a predetermined value so that its viscosity lowers, and accordingly, noise is likely to occur. In this case, the controller 19 energizes a solenoid valve 16 so as to actuate an air cylinder 14, and accordingly, a brake shoe 13 abuts against a driven gear 10 so as to restrain the movement of the driven gear 14, thereby it is possible to restrain abnormal sound from being generated from the transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission noise suppression device.

[0002]

2. Description of the Related Art Various devices have been proposed for preventing abnormal noises such as rattling noises and rattling noises of a transmission due to fluctuations in engine rotation and torque.

As this conventional device, for example, there is a device in which a braking member is provided on the end surface of the counter shaft to give resistance to the counter shaft when the parking brake is activated to suppress the fluctuation thereof. Further, there is one in which the side surface of the gear is constantly pressed by an elastic member to suppress fine movement of the gear. Further, although it is a marine engine, there is one that suppresses the rotation fluctuation by providing a braking means on the output shaft of the gear (Actual No. 56-174749, 58-182020, 63-186).
No. 58, 63-196859, Actual Kaihei 1-441763
No. 1-43261, 1-133560, 4-42
No. 946, No. 4-128568, etc.).

On the other hand, the abnormal noise of this transmission is
It tends to occur during idling when there are large fluctuations in engine rotation and torque, and when the lubricating oil temperature of the transmission is low and the viscosity is high, abnormal noise does not occur because the movement of the gears is suppressed, but the viscosity of the lubricating oil When the temperature drops to a high temperature, abnormal noise is likely to occur.

[0005]

However, in the conventional example in which the braking member is provided on the end surface of the counter shaft, the generation of the abnormal noise can be prevented only when the parking brake is operated during idling.

Further, in the case where the side surface of the gear is constantly pressed by the elastic member, the loss power is increased by that amount and the wear is inevitable.

Further, if the braking means is provided on the output shaft of the gear like the marine engine, the abnormal noise of the gear of the mission cannot be prevented.

Therefore, in any of the conventional examples, the abnormal noise of the transmission cannot be accurately prevented.

The object of the present invention is to solve such a problem.

[0010]

According to the present invention, as shown in FIG. 1, a means 1 for detecting an engine speed, a means 2 for detecting a lubricating oil temperature of a transmission, and a driven gear of a transmission are braked. The brake means 3 and the drive device 4 for operating the brake means 3 when the engine speed is at the idling speed and the lubricating oil temperature of the transmission is equal to or higher than a predetermined value are provided.

[0011]

Therefore, when the engine speed is at the idling speed and the lubricating oil temperature of the transmission is likely to cause an abnormal noise above a predetermined value, the braking means is operated to brake the gear on the driven side of the transmission. As a result, abnormal noise is accurately prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, 10 is a driven gear of a transmission, and 11 is a transmission case. Brake means 12 is provided on the driven gear 10.

The brake means 12 is provided with an air cylinder 14 as an actuator in which a brake shoe 13 is attached to the tip of a rod, and is arranged on the outer peripheral portion of the driven gear 10 with the brake shoe 13 facing each other.

The air cylinder 14 is connected to an air pipe 15 for guiding air of a predetermined high pressure from an air reservoir (not shown) or the like, and a solenoid valve 16 is installed in the middle of the air pipe 15.

When the solenoid valve 16 is turned on, high pressure air is introduced into the air cylinder 14, the brake shoe 13 moves forward and contacts the driven gear 10, and the driven gear 10 is braked.

When the solenoid 16 is turned off, the air cylinder 14 is opened, the brake shoe 13 is retracted, and the braking of the driven gear 10 is released.

A vacuum cylinder may be used in place of the air cylinder 14 and operated by negative pressure. If the required braking force is small, a solenoid may be used as the actuator.

On the other hand, the transmission case 11 is provided with an oil temperature sensor 17 for detecting the lubricating oil temperature, which is stored in the transmission lubricating oil and is lubricated by pumping or forced lubrication.

A rotation speed sensor 18 for detecting the rotation speed of an engine (not shown) is also provided.

These oil temperature sensor 17 and rotation speed sensor 1
A controller 19 as a drive device based on the signal of 8
Thus, the solenoid valve 16 is controlled.

Next, the control contents of the controller 19 will be described with reference to the flowchart of FIG.

First, the lubricating oil temperature of the transmission is measured in step 1, and it is determined in step 2 whether the lubricating oil temperature is equal to or higher than a predetermined temperature (set according to the viscosity characteristic of the lubricating oil).

When the lubricating oil temperature is lower than the predetermined temperature, the solenoid valve 16 is turned off in step 6, and when the lubricating oil temperature is higher than the predetermined temperature, the process proceeds to step 3.

In step 3, the engine speed is measured,
In step 4, it is determined whether the engine speed is less than or equal to the idling speed.

When the engine speed is higher than the idling speed, the solenoid valve 16 is turned off in step 6, and when the engine speed is lower than the idling speed, the solenoid valve 16 is turned on in step 5.

That is, when the lubricating oil temperature of the transmission is above a predetermined temperature and the engine speed is below the idling speed, the solenoid valve 16 is turned on, the air cylinder 14 is driven, and the brake shoe 13 is driven. The gear 10 is brought into contact with the gear 10, and the driven gear 10 is braked.

As a result, the viscosity of the lubricating oil of the transmission is reduced, and the movement of the driven gear 10 is suppressed during operation in which the engine rotation fluctuation and torque fluctuation are large.
Generation of abnormal noise of the transmission is prevented.

Therefore, since the driven gear 10 is braked only when abnormal noise is likely to occur, the transmission is effectively prevented without causing a loss of power, an increase in gear shifting operation force, and an increase in wear of the brake shoes 13. The generation of abnormal noise is prevented.

By the way, the brake means 12 is provided at the most effective position for preventing abnormal noise depending on the structure and type of the transmission.

In the case of the transmission as shown in FIG. 4, the position A of the counter drive gear 21 that meshes with the main drive gear 20 (a part that may rotate integrally with the counter shaft 22), the position B of the main gear 24 of the main shaft 23, The reverse main gear 25 is provided at the position C, the reverse idler gear 26 is provided at the position D, etc., but the reverse idler gear 26 is most likely to generate rattling noise. it can.

The magnitude of the braking force is 20 to 200 kg in the case of a large vehicle transmission.

FIG. 5 shows another embodiment of the present invention in which a vehicle speed sensor (not shown) for detecting the vehicle speed is provided and the controller 1
The vehicle speed condition is added to the control by 9.

In this case, it is determined in step 10 whether or not the vehicle speed is less than or equal to a predetermined value. If the vehicle speed is less than or equal to the predetermined value, the flow similar to that in FIG. 3 is entered. The valve 16 is turned off.

With this arrangement, it is possible to prevent the brake from being applied when the engine speed drops below the idling speed during running.

[0035]

As described above, according to the present invention, means for detecting the engine speed, means for detecting the lubricating oil temperature of the transmission, braking means for braking the driven gear of the transmission, and engine speed. Is at the idling speed, and the drive device that operates the braking means when the lubricating oil temperature of the transmission is equal to or higher than the predetermined value is provided, so that power loss, increase in gear shifting operation force, and increase in brake wear are prevented. , It is possible to accurately prevent the transmission from generating abnormal noise.

[Brief description of drawings]

FIG. 1 is a block diagram of the invention.

FIG. 2 is a partial configuration cross-sectional view of an example.

FIG. 3 is a control flowchart.

FIG. 4 is an explanatory view showing an arrangement position of brake means.

FIG. 5 is a control flowchart of another embodiment.

[Explanation of symbols]

 10 Driven Gear 13 Brake Shoe 14 Air Cylinder 16 Solenoid Valve 17 Oil Temperature Sensor 18 Rotation Speed Sensor 19 Controller 21 Counter Drive Gear 24 Main Gear 24 25 Reverse Main Gear 26 Reverse Idler Gear

Claims (1)

[Claims] 1. A means for detecting an engine speed, a means for detecting a lubricating oil temperature of a transmission, and a braking means for braking a driven gear of the transmission.
A noise suppressing device for a transmission, comprising: a drive device that operates a brake means when the engine speed is at an idling speed and the lubricating oil temperature of the transmission is equal to or higher than a predetermined value.