JPS61244926A - Clutch wear amount display device - Google Patents

Abstract

PURPOSE:To inform an operator of clutch wear amount through sense of sight by computing clutch wear amount based on a detecting signal from a half clutch detecting means and displaying the clutch wear amount. CONSTITUTION:When a CPU 12 judges presence of half clutching condition, half clutch stroke amount X of a rod 6a is computed based on a detecting signal from a stroke detecting sensor 7. And the CPU 12 outputs either one out of wear amount degree signals S1-S11 on an interface 9. And either one of clutch wear amount display units 16 radiates corresponding to wear amount degree signals S1-S11 output from the interface 9. Therefore, the degree of present wear of the clutch 2 can be confirmed by an operator by watching which luminous element radiates.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a vehicle such as a forklift truck equipped with a transmission with a clutch, and more specifically relates to a clutch wear amount display device that displays the amount of wear on the clutch. It is.

(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 turning on and off the clutch.

(Problems to be Solved by the Invention) However, if the clutch is used for a long period of time or the number of times it is turned on and off increases, wear of the clutch cannot be avoided. If the operator fails to notice such a worn state of the latch, there is a risk that the operation of the vehicle will be hindered, which is a concern from the viewpoint of safe driving. Therefore, it would be very useful and desirable from the perspective of predicting danger if the operator could visually confirm the degree of wear on the clutch.

The object of the present invention is to solve this problem and provide a clutch wear display device that informs the driver of the amount of clutch wear.

Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention provides a clutch driving means for actuating a clutch and controlling the connection state of the clutch, and the amount of movement of the clutch driving hand is increased. A movement amount detection means is provided for detecting the amount of movement.

Furthermore, a half-clutch detection means for detecting a half-clutch state, and a calculation means for calculating the amount of clutch wear based on the detection signals from the movement amount detection means and the half-clutch detection means are provided. Further, a display means for displaying the amount of clutch wear calculated by the calculation means is provided.

(Function) With the above configuration, the calculation means calculates the amount of clutch wear based on the detection signals from the movement amount detection means for detecting the movement ω of the clutch drive means and the half-clutch detection means for detecting the half-clutch state. The display means displays the amount of clutch wear based on the results.

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

Figure 1 shows the mechanism of the drive system of a forklift, in which the output of the engine 1 is transmitted through a dry single-plate clutch 2 to an automatic transmission 3.
The automatic transmission 3 drives the running drive wheels 5 forward and backward at a predetermined gear ratio via the differential gear mechanism 4. The dry single-plate clutch 2 that cuts the output of the engine 1 has its connection state adjusted relative to the stroke amount of the extending rod 6a based on the drive of a clutch control actuator 6 as a clutch drive means. Ru.

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

On the other hand, the automatic transmission 3 can be shifted between 1st speed (low speed) and 2nd speed (high speed) by driving a shift switching actuator (not shown), and can be shifted between 1st speed (low speed) and 2nd speed (high speed) by driving a forward/forward switching actuator (not shown). It is possible to switch between forward travel and reverse travel.

Next, clutch wear amount detection display 4! The electric circuit of the device will be explained with reference to FIG.

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

Engine rotation speed sensor 10 detects the rotation speed of the output shaft of engine 1 and outputs the detection signal to interface 9 . In addition, an input shaft rotation speed sensor 11 constitutes a half-clutch detection means together with CPtJ12 to be described later.
detects the rotational speed of the input shaft 3a of the automatic transmission 3 and outputs the detection signal to the interface 9.

Central processing unit t (hereinafter referred to as cPU) as a calculation means
12 is a read-only memory (hereinafter referred to as R) as a storage device.
It operates according to a control program stored in the OM (hereinafter referred to as OM) 13, and receives detection signals from each of the sensors through the input/output interface 9.

Also, CP (J12) is determined based on detection signals from a vehicle speed sensor (not shown) that detects the rotation speed of the output shaft of the automatic transmission 3 and an accelerator opening sensor (not shown) that detects the amount of opening of the accelerator pedal. Determine the optimal shift state for the driving condition.

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 determined speed change state to drive a drive mechanism (not shown) to change the speed of the automatic transmission R3. Switch the state to 1st or 2nd speed.

At the time of this switching, the CPLJ 12 outputs a drive signal to the actuator drive circuit 14 to drive the clutch control actuator 6 to disconnect the dry single plate clutch 2. Note that the speed change state for this running state is set in advance, and the speed change data is stored in the ROM 13.
is stored in

Further, the CPtJ 12 determines whether the clutch 2 has rotated based on the detection signal from the input shaft rotation speed sensor 11, and determines when the input shaft 3a of the automatic transmission 3 starts rotating as a half-clutch state. It is determined that Then, when it is determined that the CPL 112 is in a half-clutch state,
Based on the detection signal from the stroke detection sensor 7 input at that time, the clutch control actuator 6
The half-clutch stroke amount of the rod 6a x 1, that is,
The connection state (degree of connection) of the dry single plate clutch 2 is determined.

Furthermore, CPL112 Perform the calculation.

In addition, XO is the initial clutch stroke amount until the clutch is in a half-clutch state when the clutch 2 is not worn (that is, when the clutch is first used), and x 1 is the initial clutch stroke amount when the clutch 2 is not worn. The maximum allowable amount, that is, the limit clutch wear, and both data are equal to the R
It is stored in the OM 13 and read out when performing the calculation.

Then, the CPU 12 outputs wear amount signals 81 to S11 corresponding to the table below when the calculated value of A corresponds to one of the ranks in units of 10% between 0 and 100%.

(Unit: % of A) Note that readable and rewritable memory (hereinafter referred to as RA)
M) 15 is designed to temporarily store various calculation results of the CPU 12.

A clutch wear amount indicator 16 as a display means is provided in the driver's cab and is connected to the interface 9. This clutch wear amount indicator 16 includes a plurality of display elements (for example, light emitting diodes, indicator lamps, etc.) 17a.
, 17b are connected in series according to the degree of wear amount, and wear amount degree signals 81 to 8 are outputted from the interface 9.
11, one of them emits light.

In addition, the display element 17 corresponding to the wear level signal 81.82
b is configured to light up in red, and other display elements 17
a is configured to light up in green.

Next, the use of the forklift constructed as described above will be explained.

Now, when the accelerator pedal (not shown) is operated while driving, a vehicle speed sensor (not shown) detects the rotation speed of the output shaft of the automatic transmission 3 and an accelerator opening sensor (not shown) detects the opening amount of the accelerator pedal. Based on the detection signal from the vehicle (not shown), the CPU 12 determines the optimum speed change state for the current driving condition based on the speed change 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 12 based on the determined speed change state to drive a drive mechanism (not shown) to control the automatic transmission 3. Switch the gear change state to 1st or 2nd speed.

At the time of this switching, the CPU 12 outputs a drive signal to the actuator drive circuit 14 to drive the clutch control actuator 6 to disconnect the dry single plate clutch 2.
When the automatic gear shift 113 completes switching, the disconnected clutch 2 is driven in the connecting direction based on the drive of the clutch control actuator 6.

In this state where the clutch 2 is driven in the connecting direction, the CPU 12 determines whether 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 rotating, it is determined that the clutch is in a half-clutch state.

When the CPL 112 determines that the clutch is in a half-clutch state, the half-clutch stroke amount x1 of the rod 6a of the clutch control actuator 6, that is, the dry veneer The state of connection ai (degree of connection) of clutch 2 is determined.

Next, CPtJ12 is the initial value clutch stroke amount xO and the limit clutch wear amount X stored in the ROM13.
1 is read out, and calculation is performed based on both data and the half-clutch stroke amount X at that time.

Then, the CPU 12 outputs one of the wear amount degree signals 81 to S11 corresponding to the calculated magnitude of A to the interface 9. The Clara wear amount indicator 16 receives a wear amount signal 81 output from the interface 9.
- One of them emits light in response to S11.

Therefore, the operator can confirm the current level of wear of the clutch 2 by visually checking which light emitting element has emitted light. In particular, when the red display element 17b lights up, it is notified that there is a particularly dangerous situation.

Next, the second embodiment will be described. In the embodiment described above, the CPU 12 is configured to determine the half-clutch state when the input shaft 3a of the automatic transmission 3 starts rotating. Shaft rotation speed sensor 11
The half-clutch detection means is composed of the CPU 12 and the engine rotation speed sensor 10, the input shaft rotation speed sensor 11, and the CPU 12.
It consists of U12. That is, both sensors 10.
Based on the detection signal from the stroke detection sensor 7, the CPtJ12 determines when both rotational speeds are the same, that is, when the clutch 2 is fully connected, and based on the detection signal from the stroke detection sensor 7 at that time. The complete connection stroke amount Xp is determined.

The CPU 12 determines the half-clutch state by calculating the half-clutch stroke amount X using the calculation formula: X-Xp-ΔX. The CPtJ12 is different from the first embodiment in that it is configured to calculate the value of A based on this result in the same manner as in the first embodiment.

Note that ΔX is the difference between the full engagement stroke IXp and the half-clutch stroke amount X, and is obtained in advance from empirical rules, and this data is stored in the ROM 13 and read out at the time of the calculation.

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

Next, a third embodiment will be explained. In this embodiment, the second
As in the embodiment, the half-clutch detection means is the engine rotation speed sensor 10. Input shaft rotation speed sensor 11 and C
It is composed of PU12. Then, the CPU 12 determines 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, when it reaches within 90% of the engine rotation speed). The connection stroke IX+n is determined based on the detection signal from the stroke detection sensor 7 at that time.

The CPLJ 12 detects a half-clutch state by outputting a half-clutch stroke amount X@fit using the calculation formula: X=Xm-ΔX.

Then, based on this result, the CPU 12
This embodiment differs from the second embodiment in that the value of A is calculated in the same way as in the embodiment.

Next, a fourth embodiment will be described. This embodiment differs from the second embodiment in that the intermediate clutch detection means is composed of a stall detection sensor 7 and a CPU 12. That is, when the clutch 2 is fully connected, the rod 6a in the clutch control actuator 6
The stroke detection sensor 7 detects the stroke 5 at the end position (that is, the fully connected stroke amount XI),
The CPLJ 12 determines the complete connection stroke 1txp based on the detection signal from the stroke detection sensor 7.

The operation and effect are the same as in the second embodiment.

Note that the present invention is not limited to the above embodiments,
The invention may be modified and implemented as appropriate without departing from the spirit of the invention.

Effects of the Invention As described above, according to the present invention, it is possible to notify the operator of the wear state of the clutch caused by long-term use of the clutch or an increase in the number of times it is engaged and disengaged, and thereby it is possible to predict danger. At the same time, it is possible to predict when the clutch will be replaced, and as a result, there is no risk of interfering with the operation of the vehicle, and there is an excellent effect that there is no risk of interfering with the safe operation of the vehicle.

[Brief explanation of the drawing]

Fig. 1 is a mechanism and electrical block circuit diagram showing the mechanism of a forklift embodying the present invention, Fig. 2 is a front view of the clutch wear amount indicator, Fig. 3 is an explanatory diagram of the clutch stroke amount, and Fig. 4 is It is a flowchart. Engine 1, dry single-plate clutch 2, automatic transmission 3, clutch control actuator 6, rod 6a, stroke detection sensor 7, engine rotation speed detection sensor 10, input shaft rotation speed sensor 11, CPU 12, ROM 1
3. Actuator drive circuit 14, clutch wear amount indicator 16, display element 17゜Patent applicant: Toyota Industries Corporation Fuji
General Co., Ltd. Agent Patent Attorney On1) Hironobu'1X21!1 Figure 8Xt X4” ”” Figure 4

Claims (1)

[Claims] 1. A clutch that turns on and off the output of the engine and transmits the output to the transmission, a clutch drive means that operates the clutch and controls the connection state of the clutch, and a movement amount detector that detects the amount of movement of the clutch drive means. a half-clutch detection means for detecting a half-clutch state; a calculation means for calculating a clutch wear amount based on detection signals from the movement amount detection means and the half-clutch detection means; and a clutch calculated by the calculation means. A clutch wear amount display device comprising a display means for displaying the amount of wear.