JP2014102177A - Running torque inspection device and phase management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of determining a reference phase in rotation of a cam shaft.SOLUTION: A running torque inspection device 1 includes: a head 11 that can be coupled to a cam shaft 3 so as not to rotate relatively; a motor 15 that rotates the head 11; an output torque detection unit 14 that detects output torque of the motor 15; a motor control unit 21 that controls movement of the motor 15; a pulse counter 22 that stores phase information corresponding to a phase of the head 11; a rotation restraint unit 8 that restrains rotation of the head 11 when the head 11 is in a predetermined phase; and a counter control unit 23 that, when the output torque of the motor 15 increases because the rotation restraint unit 8 restrains rotation of the head 11 when the head 11 is in the predetermined phase, stores phase information at the time of the increase in the pulse counter 22.

Description

  The present invention relates to a rotational torque inspection device and a phase management method.

  As this type of technology, Patent Document 1 discloses a valve system inspection device that inspects these valve systems in a state where a valve and a camshaft are assembled to a cylinder head of an engine. This inspection device detects an abnormal rotation of the cam by detecting a rotational torque when the cam is rotated by a motor.

Japanese Patent Laid-Open No. 11-281532

  In the configuration of Patent Document 1, the reference point for rotation of the camshaft is uncertain. That is, a reference phase (also referred to as a rotation phase, a rotation angle, or a rotation angle position) in rotation of the camshaft is not determined. Therefore, the inspection device has a problem that it is difficult to adjust the phase of the camshaft after the rotation of the camshaft.

  An object of the present invention is to provide a technique capable of determining a reference phase in rotation of a camshaft.

According to a first aspect of the present invention, a coupling portion that can be coupled to a camshaft so as not to rotate relative to the camshaft, a rotating unit that rotates the coupling unit, and an output torque detecting unit that detects an output torque of the rotating unit. Rotation control means for controlling the operation of the rotation means, phase information storage means for storing phase information corresponding to the phase of the coupling section, and rotation of the coupling section when the coupling section reaches a predetermined phase. The rotation prohibiting means for prohibiting the rotation, and if the output torque of the rotating means increases as a result of the rotation of the coupling section being prohibited by the rotation prohibiting means due to the coupling portion being in the predetermined phase, the increase And a storage control means for storing the phase information at the time in the phase information storage means. According to the above configuration, the reference phase in the rotation of the camshaft can be determined.
An insertion groove that is opened in the radial direction is formed in the coupling portion, and the rotation prohibiting means is inserted into the insertion groove of the coupling portion when the coupling portion reaches the predetermined phase. It is comprised with the part. According to the above configuration, the rotation prohibiting unit can be realized with a simple configuration.
The rotation prohibiting means further includes a pressing elastic means for pressing the inserted portion toward the coupling portion. According to the above configuration, the inserted portion is automatically inserted into the insertion groove of the coupling portion when the coupling portion reaches the predetermined phase.
According to a second aspect of the present invention, a coupling portion that can be coupled to the camshaft so as not to rotate relative to the camshaft, a rotating unit that rotates the coupling unit, and an output torque detecting unit that detects an output torque of the rotating unit. And a phase management method for a rotational torque inspection device, the first step of prohibiting the rotation of the coupling portion when the coupling portion reaches a predetermined phase, and the rotation of the coupling portion prohibited. As a result, when the output torque of the rotating means increases, a second step of storing phase information corresponding to the phase of the coupling portion at the time of the increase is included. According to the above method, the reference phase in the rotation of the camshaft can be determined.

  According to the present invention, the reference phase in the rotation of the camshaft can be determined. Accordingly, the phase of the camshaft can be easily adjusted in the process after the camshaft rotates.

FIG. 1 is an overall schematic diagram of a rotational torque inspection apparatus. FIG. 2 is an enlarged perspective view of the head and the restraining pin. FIG. 3 shows the flow of the engine production line. FIG. 4 is a flow of the rotational torque inspection method. FIG. 5 is an operation explanatory diagram of the rotational torque inspection apparatus. FIG. 6 is an operation explanatory diagram of the rotational torque inspection apparatus. FIG. 7 is an operation explanatory diagram of the rotational torque inspection apparatus. FIG. 8 is an operation explanatory diagram of the rotational torque inspection apparatus. FIG. 9 is an operation explanatory diagram of the rotational torque inspection apparatus.

  Hereinafter, the rotational torque inspection apparatus 1 will be described with reference to FIGS.

  A rotational torque inspection apparatus 1 shown in FIG. 1 is an apparatus that inspects the rotational torque of a camshaft 3 assembled to a cam housing 2 to confirm whether the rotation of the camshaft 3 is normal. As shown in FIG. 1, a cam housing 2 and a camshaft 3, a plurality of valves (not shown), and a cam housing sub 4 including a cam cap (not shown) are placed on a work table 5. A connecting pin 3 a that protrudes in the axial direction of the camshaft 3 is formed at the end of the camshaft 3.

  The rotational torque inspection apparatus 1 includes a nut runner 6, a control unit 7, a rotation prohibiting unit 8 (rotation prohibiting means), a lift actuator 9, and a base 10.

  The nut runner 6 is for rotating the camshaft 3. The nut runner 6 includes a head 11 (coupling portion), a transmission shaft 12, a head advance / retreat actuator 13, an output torque detection portion 14 (output torque detection means), and a motor 15 (rotation means).

  The controller 7 controls the operation of the rotational torque inspection device 1. The control unit 7 includes a CPU 16 (Central Processing Unit), a RAM 17 (Random Access Memory), and a ROM 18 (Read Only Memory). The ROM 18 stores a rotational torque inspection program. The rotational torque inspection program is read into the CPU 16 and executed on the CPU 16, so that the hardware such as the CPU 16 is transferred to the elevation control unit 20, motor control unit 21 (rotation control unit, phase adjustment unit), pulse counter 22 ( (Phase information storage unit), counter control unit 23 (storage control unit), head advance / retreat control unit 24, and rotational torque inspection unit 25.

  The rotation prohibiting unit 8 prohibits the rotation of the head 11 when the head 11 reaches a predetermined phase.

  The raising / lowering actuator 9 is an actuator which raises / lowers the nut runner 6 in the up-down direction.

  The base 10 suspends and supports the rotation prohibiting unit 8, the elevating actuator 9, and the nut runner 6.

(Nutrunner 6)
The head 11 is a portion that can be coupled to the camshaft 3 so as not to be relatively rotatable. As shown in FIG. 2, the head 11 is formed in a cylindrical shape. The head 11 has a cam side end surface 11a that can be opposed to the camshaft 3, and an outer peripheral surface 11b. An insertion groove 11 c is formed in the head 11. The insertion groove 11 c opens in the radial direction and the axial direction of the head 11. In other words, the insertion groove 11c is opened in the cam side end surface 11a and the outer peripheral surface 11b. Hereinafter, the term “axial direction” simply means the axial direction of the head 11.

  The transmission shaft 12 is a shaft that supports the head 11.

  The head advance / retreat actuator 13 is an actuator for advancing / retreating the head 11 and the transmission shaft 12 in the axial direction so that the head 11 is moved closer to the camshaft 3 and the head 11 is moved away from the camshaft 3. The head advance / retreat actuator 13 operates based on the advance / retreat signal output from the control unit 7.

  The output torque detector 14 is disposed between the transmission shaft 12 and the motor 15, detects the output torque of the motor 15, and generates an output torque signal. The output torque detection unit 14 outputs the generated output torque signal to the control unit 7.

  The motor 15 rotates the head 11 and the transmission shaft 12. The motor 15 operates based on the rotation command signal output from the control unit 7. Examples of the rotation command signal include a signal that specifies a phase change amount and a signal that specifies a rotation speed. The motor 15 has an incremental resolver 15a. The rotational torque inspection apparatus 1 includes a resolver 15 a as an incremental type phase information acquisition unit for acquiring phase information corresponding to the phase of the head 11. The resolver 15 a of the motor 15 outputs a pulse signal generated with the rotation of the head 11 and the transmission shaft 12 to the control unit 7.

(Rotation prohibition unit 8)
The rotation prohibiting unit 8 shown in FIG. 2 prohibits the rotation of the head 11 when the head 11 reaches a predetermined phase. The rotation prohibiting unit 8 includes a restraining pin 30 (inserted portion), a compression spring 31 (pressing elastic means), and a holding cylinder portion 32. The restraining pin 30 is a pin whose tip is formed in a conical shape. The restraining pin 30 is held by the holding cylinder portion 32 so as to be movable forward and backward. The compression spring 31 is accommodated in the holding cylinder part 32. The compression spring 31 presses the restraining pin 30 toward the outer peripheral surface 11 b of the head 11.

(Elevating actuator 9)
As shown in FIG. 1, the lift actuator 9 operates based on a lift command signal output from the control unit 7.

(Control unit 7)
The lift control unit 20 controls the lift operation of the lift actuator 9 by outputting a lift command signal to the lift actuator 9.

  The motor control unit 21 controls the rotation operation of the motor 15 by outputting a rotation command signal to the motor 15.

  The pulse counter 22 stores phase information corresponding to the phase of the head 11. Specifically, the phase information corresponding to the current phases of the head 11 and the transmission shaft 12 is held by counting the pulse signals output from the resolver 15 a of the motor 15.

  The counter control unit 23 constantly monitors the output torque signal output from the output torque detection unit 14, and as a result of the rotation of the head 11 being prohibited by the rotation inhibition unit 8 due to the head 11 being in a predetermined phase, the motor When the output torque of 15 increases, the phase information at the time of the increase is stored in the pulse counter 22. Specifically, the counter control unit 23 resets the count of the pulse counter 22 at the time of the increase, and causes the pulse counter 22 to store the phase information at the time of the increase.

  The head advance / retreat controller 24 controls the advance / retreat operation of the head advance / retreat controller 24 by outputting an advance / retreat signal to the head advance / retreat actuator 13.

  The rotational torque inspection unit 25 inspects whether there is an abnormality in the rotation of the camshaft 3 based on the output torque signal output from the output torque detection unit 14.

(Operation 1)
Next, the flow of the engine production line will be described with reference to FIG. As shown in FIG. 3, the worker first assembles the camshaft 3 and a plurality of valves (not shown) into the cam housing 2 (S200). Next, an operator completes the cam housing sub 4 by tightening a cam cap (not shown) on the cam housing 2 (S210). Next, the cam housing sub 4 is transported to the rotational torque inspection apparatus 1 by the transport belt. The rotational torque inspection apparatus 1 performs the rotational torque inspection of the camshaft 3 and the subsequent phase adjustment (S220). Thereafter, the cam housing sub 4 is mounted on the cylinder head in the main assembly line (S230).

  The component assembling step (S200), the cap tightening step (S210), the rotational torque inspection step, and the phase adjustment step (S220) are performed at different locations. In the present embodiment, since the rotational torque inspection process and the phase adjustment process are automatically performed by the rotational torque inspection apparatus 1, workers in charge of the component assembly process (S200) and the cap tightening process (S210) walk around. The range is small. Therefore, engine production efficiency is high.

(Operation 2)
Next, with reference to FIGS. 4-9, operation | movement of the rotational torque test | inspection apparatus 1 is demonstrated. FIG. 1 shows a state where the head 11 does not chuck the camshaft 3 and the head 11 faces the camshaft 3 in the axial direction.

  First, the lift control unit 20 outputs a lift command signal to the lift actuator 9 so that the state shown in FIG. Then, the lifting / lowering actuator 9 raises the nut runner 6 until the nut runner 6 reaches the original position (S300). Here, “the original position of the nut runner 6” is a relationship in which the tip of the restraining pin 30 of the rotation prohibiting unit 8 shown in FIG. 2 is pressed against the outer peripheral surface 11 b of the head 11 by the spring restoring force of the compression spring 31. Means the position of the nut runner 6.

  Next, in the state of FIG. 5, the motor control unit 21 outputs a rotation command signal to the motor 15 so that the head 11 rotates at a low speed (S310). Then, the restraining pin 30 of the rotation prohibiting unit 8 slides on the outer peripheral surface 11b of the head 11, and when the head 11 reaches a predetermined phase, as shown in FIGS. 2 and 6, the insertion groove 11c of the head 11 is inserted. (S320), the rotation of the head 11 is inhibited by the rotation inhibition unit 8. On the other hand, since the motor control unit 21 continues to try to rotate the head 11 at a low speed, the output torque of the motor 15 increases stepwise (S330). The counter control unit 23 constantly monitors the output torque signal output from the output torque detection unit 14 to detect that the output torque of the motor 15 has increased stepwise (S340), and in response to this, The pulse counter 22 is reset (S350). The reset of the pulse counter 22 by the counter control unit 23 is as follows: “If the output torque of the motor 15 increases as a result of the rotation of the head 11 being prohibited by the rotation prohibition unit 8 because the head 11 has reached a predetermined phase, the increase The phase information corresponding to the phase of the head 11 at the time is stored in the pulse counter 22 ”. That is, the pulse counter 22 stores a phase that is a reference for the rotation of the head 11. Thereby, a reference phase in rotation of the camshaft 3 can be determined. As a result, the phase of the camshaft 3 can be easily adjusted to a desired phase after the rotation inspection by the rotational torque inspection unit 25 described later.

  Next, the lift control unit 20 outputs a lift command signal to the lift actuator 9 so that the state of FIG. Then, the lifting / lowering actuator 9 lowers the nut runner 6 so that the head 11 of the nut runner 6 faces the camshaft 3 in the axial direction. When the lifting / lowering actuator 9 lowers the nut runner 6, the restraining pin 30 of the rotation prohibiting unit 8 comes out of the insertion groove 11 c of the head 11 almost without resistance.

  Next, the head advance / retreat control unit 24 outputs an advance / retreat signal to the head advance / retreat actuator 13 so as to change from the state of FIG. 1 to the state of FIG. Then, the head advancing / retreating actuator 13 advances the head 11 so that the head 11 approaches the camshaft 3, and as a result, the coupling pin 3a of the camshaft 3 shown in FIG. 1 becomes the cam side end face 11a of the head 11 shown in FIG. (S360). In this state, the motor control unit 21 outputs a rotation command signal to the motor 15 so that the head 11 rotates at a low speed. Then, after the coupling pin 3a of the camshaft 3 slides on the cam-side end surface 11a of the head 11, as shown in FIGS. 2 and 8, the head 11 is inserted into the insertion groove 11c of the head 11. 3 is coupled so as not to be relatively rotatable (S370).

  Next, the rotational torque inspection unit 25 outputs a rotation command signal to the motor 15 so that the head 11 rotates at a predetermined rotational torque inspection speed (S380). Then, the rotational torque inspection unit 25 monitors the output torque signal output from the output torque detection unit 14 to inspect whether there is an abnormality in the rotation of the camshaft 3 (S390). If the output torque signal output from the output torque detector 14 is within a predetermined allowable range, the rotational torque inspection unit 25 determines that the rotation of the camshaft 3 is normal. On the other hand, if the output torque signal output from the output torque detection unit 14 is out of the predetermined allowable range, the rotational torque inspection unit 25 determines that the rotation of the camshaft 3 is abnormal and sounds an alarm alarm, for example. A predetermined process such as is performed. When the rotational torque inspection (S390) is completed, the rotational torque inspection unit 25 outputs a rotation command signal to the motor 15 to stop the rotation of the head 11 (S400).

  Next, the motor control unit 21 as the phase adjusting means refers to the current pulse value of the pulse counter 22 so that the phase of the camshaft 3 becomes a desired phase, and sends a rotation command signal for increment control to the motor 15. Is output (S410). In other words, the motor control unit 21 as the phase adjusting unit adjusts the phase of the camshaft 3 based on the phase information stored in the pulse counter 22 (S410). In other words, the motor control unit 21 adjusts the phase of the camshaft 3 with reference to the phase information stored in the pulse counter 22. At this time, the phase at the time of resetting the pulse counter 22 (reference phase) and the number of pulses required for the head 11 to make one rotation are known. For this reason, the motor control unit 21 refers to the current pulse value of the pulse counter 22 to calculate the number of additional pulses necessary for the phase of the camshaft 3 to be a desired phase. Then, the motor control unit 21 outputs a rotation command signal corresponding to the calculated number of pulses to the motor 15 and controls the motor 15 to be incremented (S410). In other words, the rotational torque inspection apparatus 1 contacts and chucks the target (camshaft 3) whose phase is to be adjusted, and then rotates the head 11 with an increment control to a predetermined phase, thereby moving the target phase to an arbitrary position. Can be adjusted. As a result, the motor 15 rotates the head 11 by a predetermined amount, and the phase of the camshaft 3 becomes a desired phase.

  If there is a variation in the phase of the camshaft 3, the valve of the camshaft 3 may interfere with the rocker arm of the cylinder head when the cam housing sub 4 is attached to the cylinder head in the subsequent process shown in FIG. 3 (S230). There is. In order to avoid this interference, the phase of the camshaft 3 must be manually adjusted in a subsequent process. Therefore, the efficiency of attachment work falls. On the other hand, according to the phase adjustment (S410), the phase of the camshaft 3 becomes a desired phase, so that the efficiency of the mounting operation is increased. Further, since the phase adjustment (S410) is automatically performed, the efficiency of the engine production line is also improved.

  Finally, the head advance / retreat control unit 24 outputs an advance / retreat signal to the head advance / retreat actuator 13 so as to change from the state of FIG. 8 to the state of FIG. Then, the head advance / retreat actuator 13 retracts the head 11 so as to move the head 11 away from the camshaft 3, and as a result, the coupled state of the head 11 to the camshaft 3 is released (S420). And the control part 7 returns a process to S300.

  Although the preferred embodiment of the present invention has been described above, the above embodiment has the following features.

(1) The rotational torque inspection apparatus 1 includes a head 11 (coupling portion) that can be coupled to the camshaft 3 so as not to be relatively rotatable, a motor 15 (rotating means) that rotates the head 11, and an output torque of the motor 15. An output torque detection unit 14 (output torque detection unit) for detecting, a motor control unit 21 (rotation control unit) for controlling the operation of the motor 15, and a pulse counter 22 (phase for storing phase information corresponding to the phase of the head 11) Information storage means) and when the head 11 reaches a predetermined phase, the rotation prohibiting unit 8 (rotation prohibiting means) for prohibiting the rotation of the head 11 and the rotation of the head 11 when the head 11 reaches the predetermined phase. If the output torque of the motor 15 increases as a result of the prohibition by the rotation prohibiting unit 8, the phase information at the time of the increase is stored in the pulse counter 22. Unter control unit 23 (storage control unit), and a. According to the above configuration, the reference phase in the rotation of the camshaft 3 can be determined. Then, by referring to the phase information stored in the counter control unit 23, it is possible to automatically adjust the phase of the camshaft 3 to be a desired phase after the rotational torque inspection of the camshaft 3. Become.

(2) The head 11 is formed with an insertion groove 11c opened in the radial direction. The rotation prohibiting unit 8 includes a restraining pin 30 (inserted portion) that is inserted into the insertion groove 11c of the head 11 when the head 11 reaches a predetermined phase. According to the above configuration, the rotation prohibiting unit 8 can be realized with a simple configuration.

(3) The rotation prohibiting unit 8 further includes a compression spring 31 (pressing elastic means) that presses the restraining pin 30 toward the head 11. According to the above configuration, the restraining pin 30 is automatically inserted into the insertion groove 11c of the head 11 when the head 11 reaches a predetermined phase.

(4) Rotational torque inspection including a head 11 that can be coupled to the camshaft 3 so as not to be relatively rotatable, a motor 15 that rotates the head 11, and an output torque detector 14 that detects an output torque of the motor 15. The phase management method in the apparatus 1 is as follows. (A) When the head 11 reaches a predetermined phase, the first step (S320) for prohibiting the rotation of the head 11 and the rotation of the head 11 are prohibited. When the output torque increases, a second step (S350) for storing phase information corresponding to the phase of the head 11 at the time of the increase is included. According to the above method, by referring to the stored phase information, the phase of the camshaft 3 can be automatically adjusted to a desired phase after the rotational torque inspection of the camshaft 3.

  In the above-described embodiment, the resolver 15a of the motor 15 is an incremental type, but an absolute type resolver may be used instead. However, absolute resolvers are very expensive and cannot be chosen cost-effectively.

DESCRIPTION OF SYMBOLS 1 Rotation torque inspection apparatus 2 Cam housing 3 Cam shaft 3a Connecting pin 4 Cam housing sub 5 Work place base 6 Nut runner 7 Control part 8 Rotation prohibition unit 9 Lifting actuator 10 Base 11 Head 11a Cam side end surface 11b Outer peripheral surface 11c Insertion groove 12 Transmission Shaft 13 Head advance / retreat actuator 14 Output torque detection unit 15 Motor 15a Resolver 20 Elevation control unit 21 Motor control unit 22 Pulse counter 23 Counter control unit 24 Head advance / retreat control unit 25 Rotational torque inspection unit 30 Restraint pin 31 Compression spring 32 Holding cylinder

Claims (4)

A coupling part that can be coupled to the camshaft so as not to rotate relative to the camshaft;
Rotating means for rotating the coupling part;
Output torque detection means for detecting output torque of the rotation means;
Rotation control means for controlling the operation of the rotation means;
Phase information storage means for storing phase information corresponding to the phase of the coupling unit;
Rotation prohibiting means for prohibiting rotation of the coupling portion when the coupling portion is in a predetermined phase;
If the output torque of the rotating means rises as a result of the rotation of the connecting part being prohibited by the rotation prohibiting means due to the joining part being in the predetermined phase, the phase information at the time of the increase is displayed as the phase information. Storage control means for storing in the information storage means;
Rotating torque inspection device with The rotational torque inspection device according to claim 1,
An insertion groove that is opened in the radial direction is formed in the coupling portion,
The rotation prohibiting means includes an inserted portion that is inserted into the insertion groove of the coupling portion when the coupling portion is in the predetermined phase.
Rotational torque inspection device. The rotational torque inspection device according to claim 2,
The rotation prohibiting means further includes pressing elastic means for pressing the inserted portion toward the coupling portion.
Rotational torque inspection device. A coupling portion that can be coupled to the camshaft so as not to rotate relative to the camshaft; a rotation unit that rotates the coupling unit; and an output torque detection unit that detects an output torque of the rotation unit;
A phase management method in a rotational torque inspection apparatus comprising:
A first step of prohibiting rotation of the coupling portion when the coupling portion is in a predetermined phase;
If the output torque of the rotating means increases as a result of the rotation of the coupling portion being prohibited, a second step of storing phase information corresponding to the phase of the coupling portion at the time of the increase;
including,
Phase management method.

Images