JP3282754B2 - Camshaft manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a camshaft used for an automobile engine or the like. More specifically, the present invention relates to a camshaft manufacturing apparatus. The present invention relates to improvement of a device for sequentially press-fitting.

[0002]

2. Description of the Related Art An assembly camshaft manufacturing apparatus for sequentially assembling a plurality of assembly parts such as cam pieces arranged on a turntable on one camshaft is known from Japanese Patent Publication No. 58-54901. A camshaft manufacturing apparatus which raises an assembly part set position on the outer peripheral surface of a shaft and press-fits the assembly part into the position is known from Japanese Patent Application Laid-Open No. 3-168305.

A known device includes a chuck for gripping one end of a shaft, a clamp for holding a cam piece and sliding and rotating in the axial direction of the shaft, and a punch for forming a projection on the outer peripheral surface of the shaft. The apparatus firstly punches a first cam piece set position on the outer peripheral surface of the shaft to form a first protrusion of an annular ridge on the shaft, and then mounts the first cam piece on the clamp, and attaches the clamp to the first cam piece.
The cam piece is rotated to a predetermined angular position with respect to the shaft, and the clamp is further advanced axially toward the shaft to press-fit the first cam piece from the open end side of the shaft to the first cam piece set position. Then, the first cam piece of the clamp is opened, the clamp is retracted in the axial direction, and comes out of the open end of the shaft to finish press-fitting the first cam piece. Next, a second projection is formed at the second cam piece setting position on the outer peripheral surface of the shaft with a punch, the second cam piece is mounted on the clamp, and the second cam piece is connected to the second cam piece set on the shaft in the same manner as the first cam piece. Press into position. In this way, a predetermined number of cam pieces are pressed into one shaft.

[0004]

The above-mentioned device is a system in which a bulge is formed on the outer peripheral surface while the shaft is supported only at one end, and a cam piece is fitted into the shaft from the opposite open end. The shaft may be eccentric for supporting. Further, since the operator attaches / detaches the shaft to / from the chuck coaxially with a tool or assembling part for machining the outer peripheral surface of the shaft, there is a problem that the attachment / detachment of the shaft requires time and skill.

The present invention has been made in order to solve this problem, and an object of the present invention is to provide an apparatus which does not require the shaft to be eccentric and does not require any manual operation for attaching and detaching the shaft to and from the chuck. It is in.

[0006]

In order to achieve the above object, the present invention employs a turntable having a clamper for detachably holding a plurality of assembled parts, and an upper end of a vertical shaft. A chuck for detachably and rotatably gripping the chuck, processing means for radially entering and exiting the shaft gripped by the chuck to form an annular ridge on the outer peripheral surface of the shaft, and a shaft axially holding the chuck. A press-fitting means for press-fitting the annular ridge formed by the processing means into one of the assembled parts gripped by the clamp means, and moving the shaft held by the press-fitting means around its axis. A shaft rotating means for rotating is provided, and at least the lower end of the shaft on which an annular ridge is being machined on the outer peripheral surface is automatically centered and supported by the center means. Shaft receiving means for receiving a new shaft at the shaft supply / storage position, transporting the shaft to a position where the press-fitting means grips the upper end, receiving the assembled shaft from the press-fitting means, and transporting it to the shaft supply / storage position. It is in.

[0007]

The camshaft assembling operation according to the present invention is as follows. First, all the components to be mounted on one shaft are arranged in the circumferential direction on the clampers arranged at equal arc intervals on the turntable. Then, in the shaft supply unit, the shaft delivery means is caused to grip the lower end of the shaft, the shaft delivery means is half-turned and moved to a position coaxial with the chuck. Swing the means to the standby position. Next, the chuck is lowered to set the first assembly component setting position of the shaft to the position of the processing means. Next, the lower end of the shaft is self-centered by raising the center means, and is pressed and supported. An annular ridge such as a knurl is formed at the first assembly component setting position by the processing means. Then, the center means is lowered, and the turntable is turned to arrange the first assembly component attached to the clamper coaxially with the shaft. After rotating the chuck holder to adjust the angular position of the shaft to the first assembly part, the chuck and the center means are lowered to press-fit the annular ridge formed at the first assembly part setting position into the first assembly part. . After the press-fitting, the chuck is raised and the press-fitted first assembled component is removed from the clamper.

[0008] Again, as in the case of the first assembly part, an annular ridge is formed at the second part setting position of the shaft, and it is pressed into the second assembly part. All the assembled parts thus arranged on the turntable are assembled on the shaft. Then, the shaft delivery means is again half-turned to the coaxial position with the chuck to grip the shaft, and after the shaft is released from the chuck, the shaft delivery means is half-turned to the shaft supply unit, and the assembled camshaft is removed from the shaft delivery means. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the embodiments shown in the drawings. As shown in FIGS. 1 and 2, a gate 22 is erected on the frame 10 and a lift 17 which is raised and lowered by hydraulic pressure is attached to the gate. Chuck holder 14 on lift 17
Is mounted so as to be pivotable, and the chuck 11 is mounted on the chuck holder 14. A center holder 13 that moves up and down by hydraulic pressure is erected on the frame 10, and the center 12 is attached to the center holder so as to be able to move up and down. Frame 10
The turntable 18 which is turned by hydraulic pressure is mounted on the turntable. A plurality of clampers 20 are arranged on the turntable 18 at equal arc intervals with respect to the rotation center. Each clamper 20
Holds the assembled component 2 upward and detachably.

The arm holder 16 is mounted on the fixed table 23 of the frame 10 so as to be able to turn horizontally by hydraulic pressure.
The fixed table 23 is provided with a center path 24 on which the center 12 moves up and down. The distal ends of two arm grippers 15 extending in the diameter direction from the arm holder 16 support the lower end of the shaft 1 detachably. The shaft 1 held by the arm gripper 15 when the arm holder 16 is at the position shown in FIG.
Is located at an assembly position coaxial with the chuck 11. Here, in order to smoothly transport the shaft 1 to the assembling position by the arm gripper 15 or transport the shaft 1 to the shaft supply unit 25, the arm gripper 15 is made extendable and contractible in the longitudinal direction.

A shaft supply unit 25 is provided behind the chuck 11 and the frame 10 for supplying a shaft before assembly and receiving the shaft after assembly. A new shaft is delivered to the arm gripper 15 from the shaft supply unit 25, or the assembled shaft is received from the arm gripper 15 and stored in the completed assembly storage unit. These are performed by a manual operation (not shown), but may be automatically operated.

As shown in FIG. 2, a new shaft is transferred from the shaft supply unit 25 to the arm gripper 15, and then the shaft 1 is turned by half a turn as shown by the arrow to convey the shaft 1 to the assembly position. Thus, as shown in FIG. 1, the shaft 1 is coaxial with the chuck 11 and the center 12, and the lift 17 descends as shown by the arrow, and the chuck 11 grips the upper end of the shaft 1. When the chuck 11 grips the shaft 1, the arm gripper 15 releases the shaft 1, and the arm holder 16 turns by 90 ° and stops at the standby position shown in FIG.

Next, as shown in FIG. 4 (a), the center 12 rises to automatically center the lower end of the shaft 1 and to press and support it. As shown in FIG.
When the center 12 presses and supports the lower end of the shaft 1, as shown by an arrow, the center 12 goes in and out of the shaft 1 to form a knurl as an annular ridge 3 on the outer peripheral surface of the shaft 1.

After forming the knurl, the processing means is changed to the shaft 1
, And the center 12 is lowered below the fixed table 23 as shown in FIG.
The first assembly part 2 is arranged coaxially with the shaft 1 by partially turning the turntable 18. Then, as shown by an arrow in FIG. 4D, the center 12 is raised again, passes through the shaft hole of the assembly component 2, and hits the lower end of the shaft 1. The angular position of the shaft 1 gripped by the chuck 11 is adjusted to the angular position of the first assembly component 2 gripped by the clamper 20 by rotating the chuck holder 14.

Next, as shown in FIG. 4 (e), the center 12 and the chuck 11 are both lowered to press the knurl 3 at the first assembly component setting position into the first assembly component 2. Then, as shown in FIG. 4 (f), the chuck 11 is raised, and the shaft 1 in which the first assembly component 2 has been fitted on the knurl 3 is removed from the clamper 20. Thus, the assembling process of the first assembling component 2 is completed.

Then, although not shown, the center and the chuck, that is, the lift are moved up and down relatively, and the lower end of the shaft is automatically centered and pressed and supported by the center again. Then, a knurled annular ridge is formed at the second assembly part setting position of the shaft. Next, after descending the center, the turntable is partially rotated and the clamper holding the second assembly component is arranged coaxially with the shaft. Then, the annular ridge is press-fitted into the second assembly part, and after the press-fitting, the shaft is removed from the clamper that grips the second assembly part. Thus, the camshaft is assembled by press-fitting all the assembled parts into the shaft.

When the assembly is completed, the arm gripper 15 waiting at the standby position shown in FIG. Therefore, the chuck 11
When the arm gripper 15 rises by releasing the upper end of the shaft 1, the arm gripper 15 makes a 180 ° half-turn as shown by an arrow in FIG. Therefore, hand over the assembled shaft and receive a new shaft. Arm gripper 15 receiving new shaft
Again makes a half turn and transports the new shaft to an assembly position coaxial with the chuck 11 shown in FIG. In this manner, the cam shaft can be efficiently assembled only by sequentially delivering a new shaft to the arm gripper 15 and receiving the assembled cam shaft in the shaft supply unit.

[0018]

As described above, the apparatus of the present invention processes the outer peripheral surface of the shaft by supporting both ends of the shaft, unlike the conventional apparatus in which the outer peripheral surface of the shaft is processed with the shaft cantilevered. Because of the system, eccentricity of the shaft is prevented, it is possible to smoothly and accurately press-fit the assembled parts into the shaft, and the shaft delivery means provided with the arm gripper is provided between the shaft supply housing and the assembly position. Is turned half a turn to automatically deliver a new shaft to the chuck of the press-fitting means, and the assembled shaft is automatically received from the chuck, so that there is an excellent effect that the work of attaching and detaching the shaft is automated.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention;

FIG. 2 is a plan view of the apparatus of FIG. 1, showing a state in which an arm gripper has carried a shaft to an assembly position.

FIG. 3 is a view corresponding to FIG. 2, showing a state in which the arm gripper has stopped at a standby position.

FIGS. 4A and 4B are diagrams showing a process of assembling parts to be assembled to a shaft by the device of FIG. 1, wherein FIG. 4A shows a process of holding a shaft by a chuck and supporting by a center, and FIG. The state where an annular ridge is formed at one assembly part setting position is as follows:
(C) shows a step in which the apparatus of FIG. 1 arranges one of the first assembled parts at an assembling position, (d) shows a step in which the apparatus in FIG. 1 shows the step of press-fitting the annular ridge formed at the first assembly part setting position of the shaft into the first assembly part, and (f) clamping the first assembly part pressed into the shaft by the apparatus of FIG. The steps of extracting from the above are shown.

[Description of Signs] 1: Shaft, 2: Assembled part, 3: Annular protuberance, 10: Frame, 11: Chuck, 12: Center, 13: Center holder, 14: Chak holder, 15: Arm gripper, 16: Arm holder , 17: lift, 18: turntable, 19: turntable holder, 20: clamper, 21: processing means, 23: fixed table

Continuation of the front page (56) References JP-A-54-41266 (JP, A) JP-A-3-168305 (JP, A) JP-A-2-116433 (JP, A) JP-A-7-237049 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23P 19/00-21/00 B21D 17/02 F01L 1/04

Claims (1)

(57) [Claims] 1. A turntable (18) provided with a number of clampers (20) corresponding to the number of parts (2) to be assembled to a camshaft, and a shaft (1) holding an upper end thereof are placed on the turntable. A camshaft comprising: press-fit means (17) for elevating and lowering along one central axis of the clamper; and processing means (21) for forming an annular ridge (3) on the outer peripheral surface of the shaft gripped by the press-fit means. A manufacturing apparatus, comprising: a shaft rotating means (14) for rotating the shaft gripped by the press-fitting means around an axis thereof; and a center means (1) for automatically centering and supporting a lower end of the shaft.
2) and a shaft delivery in which a new shaft is transported from the shaft supply storage position to a position where the press-fitting means can grip the upper end of the shaft, and the assembled shaft is received from the press-fitting means and transported to the shaft supply storage position. Means (15, 16) , said processing means
(21) is provided in the radial direction with respect to the shaft (1).
To form a knurl on the outer peripheral surface of the shaft (1)
An apparatus for manufacturing a camshaft, comprising: