JPH0756299B2 - Clutch wear indicator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle such as a forklift truck equipped with a transmission with a clutch, and more particularly to a clutch wear display device for displaying the wear amount of the clutch. is there.

(Prior Art) Conventionally, for example, in a forklift truck equipped with a transmission with a clutch, the output of the engine is controlled to be transmitted to the transmission by opening and closing the clutch.

(Problems to be Solved by the Invention) However, the wear of the clutch cannot be avoided if the clutch is used for a long period of time and the number of times the clutch is turned on and off increases. The operator may not be aware of such a clutch wear state, and even if he / she notices it, he often depends on his experience and intuition about the time to replace the clutch, and it is dangerous to continue using it as it is. Loss occurs,
Further, there is a problem that workability is deteriorated due to slippage.

The present invention solves this problem and provides a clutch wear display device for informing a driver of an abnormal state of the clutch.

Configuration of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention provides a clutch for turning on and off the output of the engine and transmitting the output to the transmission, and a clutch for operating the clutch. Clutch drive means for controlling the connection state, movement amount detection means for detecting the movement amount of the clutch drive means, notification means for notifying an abnormality of the clutch, and half-clutch state when the clutch is not worn Storage means for storing the amount of movement of the clutch drive means up to the initial value movement amount, and storing the maximum amount of clutch wear allowed as the limit clutch wear amount, and the initial value movement amount stored in the storage means. Calculation for calculating the relative wear amount of the clutch by calculating the difference between the actual movement amount of the clutch drive means detected by the movement amount detection means and the actual movement amount of the clutch drive means. And a determination means for determining whether or not the relative wear amount of the clutch calculated by the calculation means has reached the limit clutch wear amount stored in the storage means, and the determination means of the clutch. A notification drive unit is provided for driving the notification unit when it is determined that the relative wear amount has reached the limit clutch wear amount stored in the storage unit.

(Operation) With the above configuration, the relative wear amount of the clutch is calculated by calculating the difference between the initial value movement amount stored in the storage unit and the actual movement amount of the clutch drive unit detected by the movement amount detection unit. At the same time, it is determined whether or not the calculated relative wear amount of the clutch has reached the limit clutch wear amount stored in the storage means. Then, when the determination means determines that the relative wear amount of the clutch has reached the limit clutch wear amount, it notifies that the wear of the clutch has reached the limit.

(Embodiment) A preferred embodiment in which the present invention is embodied in a forklift will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows the mechanism of the drive system of a forklift, and the output of the engine 1 is transmitted via a dry single plate clutch 2 to an automatic transmission 3
The automatic transmission 3 drives the traveling drive wheels 5 forward and backward with a predetermined gear ratio via the differential gear mechanism 4. The dry single plate clutch 2 for turning on and off the output of the engine 1 is adjusted in connection state of the clutch 2 relative to the stroke amount of the rod 6a extending based on the drive of a clutch control actuator 6 as a clutch drive means. It

The engine 1 is also used as a drive source of a hydraulic pump that supplies hydraulic oil to a lift cylinder for raising and lowering a fork and a tilt cylinder for tilting a mast.

On the other hand, the automatic transmission 3 can shift to a first speed (low speed) and a second speed (high speed) by driving a shift switching actuator (not shown), and can be driven by a forward / backward switching actuator (not shown). It is possible to switch between forward traveling and backward traveling.

Next, the electric circuit of the clutch wear amount detection and display device will be described with reference to FIG.

The stroke detecting sensor 7 as a moving amount detecting means is composed of a potentiometer, detects the stroke of the rod 6a of the clutch controlling actuator 6, and the detection signal is converted into a digital signal by the A / D converter 8 and the interface 9 is used. Is output to.

The engine rotation speed sensor 10 detects the rotation speed of the output shaft of the engine 1 and outputs the detection signal to the interface 9. The input shaft rotation speed sensor 11 detects the rotation speed of the input shaft 3a of the automatic transmission 3 and outputs the detection signal to the interface 9.

A central processing unit (hereinafter referred to as CPU) 12 as a calculation unit, a determination unit, and a notification drive unit operates according to a control program stored in a read-only memory (hereinafter referred to as ROM) 13 as a storage unit, and the input / output interface 9 The detection signal from each of the sensors is input via.
The CPU 12 also travels at that time based on detection signals from a vehicle speed sensor (not shown) that detects the number of revolutions of the output shaft of the automatic transmission 3 and an accelerator opening sensor (not shown) that detects the opening amount of the accelerator pedal. Determining the optimum shift state in the state.

Then, the CPU 12 outputs a drive control signal to an automatic transmission drive circuit (not shown) via the input / output interface 9 based on the indexed shift state to drive a drive mechanism (not shown) to drive the automatic transmission 3. The speed change state is switched to the first speed or the second speed.

At the time of this switching, the CPU 12 controls the actuator drive circuit 1
Drive signal is output to 4 and clutch control actuator 6
Is driven to disconnect the dry single plate clutch 2.

The speed change state for this running state is preset and the speed change data is stored in the ROM 13.
Further, the CPU 12 is the input shaft rotation speed sensor 1
Based on the detection signal from 1, it is determined whether or not the clutch 2 has rotated, and when the input shaft 3a of the automatic transmission 3 has started to rotate, it is determined as a half-clutch state.

When the CPU 12 determines that it is in the half-clutch state,
The clutch control actuator 6 is based on the detection signal from the stroke detection sensor 7 input at that time.
The half clutch stroke amount X of the rod 6a, that is, the connection state (connection degree) of the dry single plate clutch 2 is determined.

Furthermore, the CPU12 Is calculated.

It should be noted that X0 is the initial value clutch stroke amount until the clutch 2 is in the half-clutch state when the clutch 2 is not worn (that is, when the clutch is first used), and X1 is allowed to wear the clutch 2. Which is the maximum amount of wear, that is, the limit clutch wear amount, both data are stored in the ROM 13 and are read out at the time of the calculation (see FIG. 3).

Then, the CPU 12 outputs the display signal S corresponding to the level in units of 10% based on the calculated value of A. Further, when the preset limit clutch wear amount X1 is reached, that is, when the above A becomes 0%, a notification drive signal is output.

A readable and rewritable memory (hereinafter referred to as RAM
15) is for temporarily storing various calculation results of the CPU 12.

A clutch wear amount indicator 16 as a notification means is provided on the driver's cab and is connected to the interface 9. The clutch wear amount indicator 16 has a plurality of display elements (for example, a light emitting diode, a display lamp, etc.) 17a that light up in green and a display element 17b that lights up in red, and these display elements 17a, 17b is adapted to be turned on appropriately according to the degree of clutch wear.

Then, one of the display elements 17a emits light in response to the display signal S output from the interface 9, and the level of the wear amount is displayed stepwise. Further, the display element 17b emits light based on the notification signal output from the interface 9.

A warning buzzer 18 forming a notification means together with the clutch wear amount display 16 is provided on the driver's cab and is connected to the interface 9. And a warning buzzer
18 outputs a warning sound based on a notification signal output from the interface 9.

Next, the operation of the forklift configured as above will be described.

When an accelerator pedal (not shown) is operated during traveling, a vehicle speed sensor (not shown) that detects the number of revolutions of the output shaft of the automatic transmission 3 and an accelerator opening sensor (that detects the opening amount of the accelerator pedal) Based on the detection signal from (not shown), the CPU 12 determines the optimum shift state in the running state at that time based on the shift data stored in the ROM 13. Then, the CPU 12 outputs a drive control signal to an automatic transmission drive circuit (not shown) via the input / output interface 9 based on the indexed shift state to drive a drive mechanism (not shown) to drive the automatic transmission 3. The speed change state is switched to the first speed or the second speed.

At the time of this switching, the CPU 12 controls the actuator drive circuit 1
Drive signal is output to 4 and clutch control actuator 6
When the dry single plate clutch 2 is disengaged and the switching of the automatic transmission 3 is completed, the disengaged clutch 2 is driven in the connecting direction based on the drive of the clutch control actuator 6. .

Then, in this state in which the clutch 2 is driven in the connecting direction, the CPU 12 determines whether or not the input shaft 3a of the automatic transmission 3 has rotated based on the detection signal output from the input shaft rotation speed sensor 11. , When the input shaft 3a of the automatic transmission 3 starts to rotate is determined to be in the half-clutch state.

When the CPU 12 determines that the clutch is in the half-clutch state, the CPU 12 determines the half-clutch stroke amount X of the rod 6a of the clutch control actuator 6, that is, the dry single plate clutch 2 based on the detection signal input from the stroke detection sensor 7 at that time. Determine the connection status (degree of connection) of.

Subsequently, the CPU 12 reads the initial value clutch stroke amount X0 and the limit clutch wear amount X1 stored in the ROM 13, and based on both data and the half clutch stroke amount X at that time. Is calculated.

Then, the CPU 12 outputs to the display signal S interface 9 corresponding to the calculated size of A. In the clutch wear amount indicator 16, any one of the display elements 17a emits light in response to the wear amount signal S output from the interface 9.

Further, when wear of the clutch 2 progresses and the clutch stroke amount at the time of half-clutch reaches a preset X1, that is, when A calculated by the CPU 12 becomes 0%, the CPU 12 outputs a notification signal to the interface 9. . The clutch wear amount indicator 16 as an informing means causes the display element 17b to emit light in response to the informing signal output from the interface 9,
Further, the warning buzzer 18 as a notification means also emits a warning sound.

Therefore, the driver can visually confirm which display element 17a is turned on to confirm at which stage the current degree of wear of the clutch 2 is. further,
When the display element 17b lights up in red and the warning buzzer 18 emits a warning sound, the driver can determine that there is a particularly dangerous state.

Next, the second embodiment will be described. In the above embodiment, the CPU 12 determines that the half-clutch state is when the input shaft 3a of the automatic transmission 3 starts to rotate, but instead, the half-clutch is used. The detection means is an engine speed sensor 10,
It is composed of an input shaft rotation speed sensor 11 and a CPU 12. That is, when both rotation speeds of the CPU 12 become the same rotation speed based on the detection signals from the both sensors 10 and 11,
That is, when the clutch 2 is in the completely connected state is determined, and the fully connected stroke amount Xp is calculated based on the detection signal from the stroke detection sensor 7 at that time.

Then, the CPU 12 determines the half-clutch state by calculating the half-clutch stroke amount X by the calculation formula of X = Xp-ΔX. The CPU 12 is different from the first embodiment in that the CPU 12 is configured to calculate the value of A based on this result, as in the first embodiment.

It should be noted that ΔX is a difference between the fully connected stroke amount Xp and the half-clutch stroke amount X, which is obtained in advance from an empirical rule, and this data is stored in the ROM 13 and read at the time of the above calculation.

Other operational effects of this embodiment are similar to those of the first embodiment.

Next, a third embodiment will be described. In this embodiment, the second
Similar to the embodiment, the half-clutch detecting means is composed of an engine speed sensor 10, an input shaft speed sensor 11 and a CPU 12. When the rotation speed of the input shaft 3a of the automatic transmission 3 reaches a rotation speed within a predetermined tolerance with respect to the engine rotation speed (for example, with respect to the engine rotation speed).
When it reaches 90%), the connected stroke amount Xm based on the detection signal from the stroke detection sensor 7 at that time.
Is designed to be indexed.

Then, the CPU 12 detects the half-clutch state by calculating the half-clutch stroke amount X by the calculation formula of X = Xm-ΔX. The CPU 12 is different from the second embodiment in that the CPU 12 is configured to calculate the value of A based on this result in the same manner as in the first embodiment.

Next, a fourth embodiment will be described. This embodiment is different in that the middle half clutch detecting means of the second embodiment is composed of the stroke detection sensor 7 and the CPU 12.
That is, when the clutch 2 is completely engaged, the stroke detection sensor 7 detects the stroke amount at the end position of the rod 6a in the clutch control actuator 6 (that is, the completely connected stroke amount Xp), and the stroke detection sensor 7 detects the stroke amount. The CPU 12 is adapted to calculate the complete connection stroke amount Xp based on the detection signal.

The function and effect are similar to those of the second embodiment.

The present invention is not limited to the above embodiment,
For example, one of the warning buzzer 18 and the clutch wear amount indicator 16 in the configuration of the first embodiment may be omitted, and various modifications may be made without departing from the spirit of the present invention.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to accurately detect the wear state of the clutch caused by the long-term use of the clutch and the increase in the number of times of on / off, regardless of the clutch assembly error and the machine-to-machine error. In addition to being able to reliably notify the wearer of the clutch's wear state, it is possible to predict the danger and predict the time to replace the clutch, and as a result, to drive the vehicle. There is an excellent effect that the vehicle can be safely operated without any fear of trouble.

[Brief description of drawings]

FIG. 1 is a mechanism and electric block circuit diagram showing a mechanism of a forklift embodying the present invention, FIG. 2 is a front view of a clutch wear amount indicator, FIG. 3 is an explanatory diagram of a clutch stroke amount, and FIG. It is a flowchart. Engine 1, dry type single plate clutch 2, automatic transmission 3, clutch control actuator 6, rod 6a, stroke detection sensor 7, engine speed detection sensor 10, input shaft speed sensor 11, central processing unit (CPU) 12, Read-only memory (ROM) 13, actuator drive circuit 1
4, clutch wear amount indicator 16, display element 17, warning buzzer 1
8.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sumi Kitagawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Seiichi Hata, 1015, Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited (56) References: 60-177333 (JP, U)

Claims (1)

[Claims] 1. A clutch for turning on and off the output of an engine and transmitting the output to a transmission, a clutch drive means for operating the clutch to control a connection state of the clutch, and a movement amount of the clutch drive means. A moving amount detecting means for detecting, an informing means for informing an abnormality of the clutch, and a moving amount of the clutch driving means until the half-clutch state is reached when the clutch is not worn, and is stored as an initial value moving amount, Storage means for storing the maximum amount of clutch wear permitted as the limit clutch wear amount, initial value movement amount stored in the storage means, and actual movement amount of the clutch drive means detected by the movement amount detection means. And a calculation means for calculating the relative wear amount of the clutch by calculating the difference between Determination means for determining whether or not the limit clutch wear amount stored in the storage means has been reached, and the relative wear amount of the clutch in the determination means has reached the limit clutch wear amount stored in the storage means And a notification drive means for driving the notification means.