JPH0141467Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an improvement of a speed change mechanism used, for example, in a mixer for food processing.

``Prior Art'' To give an example of a food processing mixer, as shown in FIG. 4, a drive section 2 equipped with a speed change mechanism is disposed on the top of a main body 1, and a stirring bar is connected to the drive section 2. The speed change mechanism changes the rotational speed of the stirrer according to processing conditions, and the stirrer stirs, for example, bread dough placed in a bowl 3 provided on the side of the main body 1. .

Although not specifically shown in the drawings, the conventional transmission mechanism used in the drive unit 2 rotatably supports an idle shaft and an output shaft inside a gearbox, and also supports each of the idle shaft and output shaft mutually. The structure is such that a plurality of gears are provided in mesh with each other, and the drive shaft of the motor is protruded into the gear box, and the drive shaft of the motor is directly connected to the idle shaft via a gear mechanism. While the rotational force is directly transmitted from the drive shaft of the motor to each gear of the idle shaft via a gear mechanism, by switching the switching lever 4 provided outside the drive unit 2, the rotational force is transmitted directly to each gear on the idle shaft side. By engaging the corresponding gear on the output shaft side, the stirrer connected to the output shaft is rotated at a desired rotational speed.

``Problems to be solved by the invention'' However, in the conventional transmission mechanism mentioned above, in which the idle shaft and the drive shaft of the motor are directly connected via a gear mechanism, the entire transmission mechanism can be downsized, and the mixer If used in the drive section 2, the mixer itself can be made smaller, but on the other hand, the gear mechanism that directly connects the drive shaft of the motor and the idle shaft becomes a source of heat and gets very hot, so it is necessary to keep a large amount of lubricating oil inside the gear box. There are some issues that must be addressed.

Moreover, in this type of transmission mechanism, the temperature of the lubricating oil becomes extremely high, and the heat of the oil not only tends to damage the oil seal part of the gearbox, but also prevents oil leakage due to this damage. There are also some problems that may arise.

Therefore, it has been difficult to use the above-mentioned type of transmission mechanism in food processing mixers where oil leakage must be avoided at all costs.

``Means for Solving the Problems'' Therefore, the present invention was developed to effectively solve the problems of the conventional transmission mechanism described above. In addition to supporting the idle shaft and the output shaft, a plurality of gears that mesh with each other are provided, and a drive shaft of a motor is protruded into a gear box, and the drive shaft of the motor is directly connected to the idle shaft via a gear mechanism. Assuming that this is a transmission mechanism, we adopted a configuration in which the drive shaft of the motor that protrudes into the gearbox is provided with a vane that scatters the lubricating oil inside the gearbox.

``Operation'' Accordingly, in the present invention, the lubricating oil inside the gearbox can be scattered by the rotation of the impeller with the rotation of the drive shaft of the motor. Not only is it possible to reduce the amount of oil as much as possible, but it also reduces heat dissipation in the vicinity of the gear direct connection between the motor's drive shaft and idle shaft, which is a source of heat and gets very hot when the blade rotates. This makes it possible to effectively suppress the temperature rise of the oil.

Therefore, damage to the oil seal portion can be effectively prevented, and oil leakage due to damage to the oil seal portion can also be reliably prevented.

``Embodiment'' Hereinafter, the present invention will be described in detail based on an illustrative embodiment.As shown in FIG.
and an output shaft 7 are rotatably supported at a constant interval, and a first gear 8 and a second gear 9 having different numbers of teeth are fixedly installed on the idle shaft 6, and between each gear 8 and 9, as will be described later. A worm wheel 10 that engages with the worm gear is fixedly mounted, and a third gear 11 that engages with the first gear 8 and a fourth gear 12 that engages with the second gear 9 are rotatably supported on the output shaft 7, respectively. ,
A clutch 13 is movably provided between the third gear 11 and the fourth gear 12, and has engaging pawls 13a and 13a that alternately engage with the clutch pawls 11a and 12a of each gear 11 and 12.

The movement or switching of the clutch 13 is performed by switching a clutch switching lever provided outside the gearbox 5.

Further, the drive shaft 14a of the motor 14 is protruded into the gear box 5, and the drive shaft 14a of the motor 14 is
A worm gear 15 is provided in the worm gear 15.
and the motor 1 via the worm wheel 10.
The four drive shafts 14a are directly connected to the idle shaft 6.

Furthermore, a motor 14 protruding into the gearbox 5
, particularly preferably between the worm gear 15 and the motor 14 and between the worm gear 15 and the motor 14.
The lubricating oil O in the gearbox 5 is located near the
A blade body 16 is provided that scatters. Furthermore, as shown in FIGS. 2 and 3, the scattering blade body 16 is
A large number of blades 16b are provided obliquely at a certain angle on the base 16a, and have a substantially conical shape that can efficiently spray the oil O onto each gear of the idle shaft 6 and the output shaft 7.

Further, in the figure, 17a is an oil seal member provided on the output shaft 7 side, and 17b is an oil seal member provided on the drive shaft 14a side of the motor 14.

In this transmission mechanism, as described above, since the blade body 16 is provided on the drive shaft 14a of the motor 14 that protrudes into the gearbox 5, the blade body 16 is always attached to the drive shaft 14a during rotation of the drive shaft 14a. Since the body 16 rotates together and efficiently scatters the lubricating oil O retained in the gear box 5 to each gear side, a sufficient lubrication state can be obtained with a small amount of oil O.
As shown in FIG. 1, assuming that the conventional level is L ₁ , in this embodiment, the blade 1 of the blade body 16 is
Level L ₂ where the tip of 6b is immersed in oil O
This means that the amount of oil O can be reduced as much as possible.

In addition, the oil O scattered by the blade body 16 rotating near the worm gear 15 in the box 5 becomes a source of heat, causing the worm gear 1 to become extremely hot.
5, promotes dissipation of heat near the worm wheel 10 provided on the idle shaft 6, and reduces oil O.
temperature rise can be effectively suppressed. Experiments have shown that the oil temperature in conventional transmission mechanisms is approximately
While the temperature reached 90℃, it was confirmed that the speed change mechanism of the present invention stayed at about 60℃.

Therefore, there is no need to worry about damage to the oil seal portion due to high oil temperatures as in the prior art, and oil leakage caused by damage to the oil seal portion can be effectively prevented.

Furthermore, the rotation of the blade body 16 is controlled by the worm gear 15.
In addition to dissipating heat, the atmosphere on the back side of the blade body 16 is also made into a negative pressure state, so that the drive shaft 14 of the motor 14
There is also the advantage that no burden is placed on the oil seal member 17b on the a side.

"Effects of the Invention" As described above, the present invention is characterized in that the drive shaft of the motor that protrudes into the gearbox is provided with a vane that scatters the lubricating oil in the gearbox. Since the rotation of the blade body caused by the rotation of the blade body can scatter the lubricating oil in the gearbox, it is not only possible to reduce the amount of oil retained in the gearbox as much as possible compared to the conventional method, but also to reduce the amount of oil retained in the gearbox as much as possible. It can promote the dissipation of heat around the gear direct connection between the motor's drive shaft and idle shaft, which is a source of heat and gets very hot during rotation, and can effectively suppress the rise in oil temperature. Since it is said that damage to the oil can be effectively prevented, oil leakage can be reliably prevented, and in particular, it is possible to provide a fully satisfactory transmission mechanism for food processing mixers where oil leakage must be avoided at all costs. It became.

Furthermore, since the amount of oil can be reduced, the oil space within the gearbox can be reduced, which also allows the transmission mechanism itself to be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part showing an embodiment of a transmission mechanism according to the present invention, Fig. 2 is a plan view of a blade provided in the transmission mechanism, Fig. 3 is a side view of the same, and Fig. 4 is a FIG. 1 is an external view showing an example of a mixer for food processing. 5...Gearbox, 6...Idle axis, 7...
...Output shaft, 8...First gear, 9...Second gear, 1
0... Worm wheel, 11... Third gear, 1
2...Fourth gear, 14...Motor, 14a...Drive shaft, 15...Worm gear, 16...Blade body.

Claims (1)

[Scope of utility model registration request] An idle shaft and an output shaft are rotatably supported inside a gear box, and a plurality of gears are provided on each of the idle shaft and output shaft to engage with each other, and a drive shaft of a motor is protruded into the gear box to drive the motor. A transmission mechanism in which a shaft is directly connected to the idle shaft via a gear mechanism, characterized in that the drive shaft of the motor protruding into the gearbox is provided with a vane body for scattering lubricating oil in the gearbox.