JP4848655B2 - Thick plate press gear - Google Patents

Description

  The present invention relates to a gear formed by press-molding a plate, and more particularly, to a thick-plate press gear in which plate press gears formed by press-molding a plate having a thickness that is easy to press-mold are laminated.

Press gears are widely used in various directions because they are inexpensive and can be mass-produced. In particular, a press gear having a spur gear on the outside has an advantage that the width of the tooth surface can be automatically determined by selecting the thickness of the metal plate because the width of the tooth surface is determined by the plate thickness.
It is attempted to use a press gear having many advantages as described above for a vehicle reclining mechanism.

  The reclining mechanism uses a worm wheel to change the direction of the axis of rotation and combine spur gears with different numbers of teeth to obtain low rotation and high torque, and then this torque is passed through the internal and external gear sets. The structure is transmitted to the seat back frame. Since the spur gear used in this mechanism receives a high torque, the tool steel is produced by cutting gears using a cutting machine such as a forming press.

JP-A-2-225141 JP-A-4-64244

As described above, since the spur gear used in the speed reduction mechanism of the reclining mechanism is manufactured using a cutting (machine) machine, it is not necessarily suitable for mass production and is expensive.
On the other hand, the production of spur gears by press molding has been put into practical use, which enables mass production of spur gears and is advantageous in terms of cost.

  However, the production of a spur gear by press forming is limited to a steel plate having a thickness of about 5 mm, so that the width of the tooth surface is restricted, which is not suitable for the production of a spur gear with high torque transmission.

  Therefore, this invention makes it the subject which should be solved to eliminate the malfunction of the prior art mentioned above.

  The present invention basically uses technical means for forming a press gear having a necessary tooth surface width by forming a press-formed gear on a plate that can be easily press-formed and superposing at least two of them.

According to the present invention, a plate press gear having a spur gear on the outer side and serrations or teeth on the inner side, forming a circular half punched portion concentric with the center thereof, and forming a convex outer peripheral surface of the half punched portion. part provided key shapes protruding in the radial direction of the semi-punched portion, and corresponds to the key-shaped portions projecting in the radial direction of the semi-punched portion in a part of the inner peripheral surface of the concave side of the half blanking portion There is provided a thick plate press gear characterized in that a groove portion is formed and the same plate press gear is laminated to increase the tooth thickness .

  Preferably, the inner serrations or teeth engage the shaft supported by the seat back frame and transmit the reduced rotation to the shaft.

  According to the present invention, since a necessary tooth surface width is obtained by stacking a plurality of thin gears that can be easily formed by pressing, high torque can be transmitted. Further, the spur gear on the outer side of the overlapped gear and the inner serration or tooth misalignment can be prevented by the engagement between the key-shaped portion and the groove portion.

  Since a thick plate gear having a desired tooth width can be easily obtained simply by laminating the same press-formed gear, a gear capable of transmitting high torque at low cost can be provided.

The electric motor mechanism 2 using the thick plate press gear 1 according to the present invention will be described with reference to FIGS. 1 and 2 prior to the description of the configuration of the thick plate press gear 1 (FIGS. 3 to 5).
The electric motor mechanism 2 is fixed to a seat back frame, for example, and its output torque is transmitted to the seat reclining mechanism and used to adjust the inclination of the seat back. The use of the thick plate press gear 1 can be used for a gear train that transmits high torque without being specified in this example.

The electric motor mechanism 2 includes a synthetic resin housing 3, a first wheel 6 that meshes with a worm wheel 5 (see FIG. 2) of an output shaft of the electric motor 4 (not shown in the main body), a metal cover 13 that covers the housing 3, Has a gear train in the housing. The gear train will be described below. A second wheel 7 having a small diameter concentric with the first wheel 6 meshes with a third wheel 9 rotatably supported by another shaft 8, and rotational torque from the electric motor is applied to the fourth wheel 10 having a small diameter concentric. It is transmitted via wheels 6, 7, 9 .
The fourth wheel 10 meshes with the thick plate press gear 1 and the center serration 11 meshes with a shaft 12 of a reclining mechanism (not shown). Thus, the high speed rotation of the electric motor 4 is changed to the low speed rotation, and the high output torque is transmitted to the reclining mechanism. Thus, the seat back inclination can be adjusted by operating the electric motor.

In the example shown in FIG. 1, the boss portion of the first wheel 6 is in the housing 3, the boss portion of the second wheel 7 is in the metal cover 13 via the bearing or bush 14, and the shaft 8 is in the bearing or bush 15. A boss portion of the fourth wheel 10 integrated with the shaft 8 is pivotally supported on the housing 3 via a bearing or bush 16 on the metal cover 13.
The shaft 12 that integrally supports the thick plate press gear 1 is supported by the metal cover 13 and the housing 3 via bearings or bushes 16 ′ and 17.

In order to reinforce the housing 3, a reinforcing plate 18 is provided on the inner wall surface of the housing 3, and bearings or bushes 16 and 17 are supported by the reinforcing plate 18 and the housing 3. Thereby, even if a high torque acts on the thick plate press gear 1, the housing 3 is not deformed.
The metal cover 13 and the bearings or bushes 14, 15, 16 ′ are joined by forming an outwardly bulging portion 19 in the metal cover 13 and increasing the surface contact area between the two by the height of the metal cover 13. The stress distribution to 13 is made possible. The height of the bulging portion 19 helps to increase the rigidity of the metal cover 13.

The press gear 24 constituting the thick plate press gear 1 of a metal plate will be described with reference to FIGS. The press gear 24 formed by press-molding a metal plate uses a metal plate of 5 mm or less that is easy to press-form because the plate thickness is limited to a conceptual thickness of 5 mm.
A spur gear 20 is formed outside the press gear 24, and an involute serration 11 is formed inside.

  The press gear 24 has a circular half punched portion 21 concentric with the spur gear 20 and the serration 11. The half punched portion 21 includes a convex portion 22 and a concave portion 23. The diameter and the protruding amount of the half punched portion 21 are such that when at least two press gears 24 are overlapped to form the thick plate press gear 1, at least two press gears 24 are integrated.

A key-shaped portion 25 is provided at one location on the outer peripheral surface of the convex portion 22 and preferably at two locations facing each other, and a groove portion 26 having a shape corresponding to the key-shaped portion 25 is provided at the same corresponding position on the inner peripheral surface of the concave portion 23. Provide. The width and height (or depth) in the circumferential direction of the key shape portion 25 and the groove portion 26 are appropriately determined.
The thick plate press gear 1 takes out at least two press gears 24 continuously press-formed in the same shape and the same size and the same process, and the key shape portion of the convex portion 22 of one press gear 24 is the groove portion of the concave portion 23 of the other press gear 24. It can be easily made by engaging with 26, that is, by inserting the convex portion 22 into the concave portion 23.
Thereby, there is no tooth misalignment of the spur gear 20 of both press gears 24, 24 and the serration 11, and torque transmission of the thick plate press gear 1 using both press gears 24, 24 is made smoothly.

It is sectional drawing which shows the electric motor mechanism using the thick plate press gear of an example of this invention. It is a top view of the example of FIG. It is a top view of a press gear. It is a bottom view of a press gear. It is sectional drawing seen from the arrow VV of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thick board press gear 2 Electric motor mechanism 3 Housing 4 Electric motor 6, 7, 9, 10 Wheel 11 Serration 12 Shaft 13 Metal cover 18 Reinforcement plate 20 Spur gear 21 Half-punch part 22 Convex part 23 Concave part 24 Press gear 25 Key shape Part 26 Groove

Claims (1)

A plate material Puresugiya having serrations or teeth on spur gear and the inside to the outside, to form a half blanking portion of the circular center thereof concentric, semi punching on a part of the outer peripheral surface of the convex side of the half blanking portion Providing a key-shaped part protruding in the radial direction of the part, and forming a groove part corresponding to the key-shaped part protruding in the radial direction of the half-cut part on a part of the inner peripheral surface on the concave side of the half-cut part; A thick plate press gear characterized in that a plate press gear is laminated to increase the tooth thickness.

Images