DE202021103232U1 - Duplex bevel planetary gear transmission mechanism and hand mixer applied with this mechanism - Google Patents

Abstract

A duplex bevel planetary gear transmission mechanism (2) comprising:
an active bevel gear (25) which is driven directly or indirectly by a motor (1);
an internal bevel gear (28), in a non-rotatable fixed setting;
a bevel pinion mount (27) rotatably mounted within the inner bevel gear (28); and
at least two duplex bevel planetary gears (26) which are evenly spaced along a circumference mounted on the bevel planetary gear holder (27); an upper bevel gear (261) of each of the duplex bevel planetary gears (26) engaging the active bevel gear (25) and a lower bevel gear (262) of each of the duplex bevel planetary gears (26) engaging the inner bevel gear (28); wherein one of the duplex bevel planetary gears (26) is an output gear for connection to a mixing attachment (4); an axial intersection angle α, which is formed between the axis of the duplex bevel planetary gear (26) as the output gear and the axis of the active bevel gear (25), is acute.

Description

Technical area

The present utility model relates to a transmission mechanism, particularly a mechanism for reduction gears with a large gear ratio, and a hand mixer to which this transmission mechanism is applied.

State of the art

At present, a variety of small household appliances for food processing are becoming more common in everyday life of ordinary people because of their convenience, and hand mixers are a very widespread device.

In general, a hand mixer comprises a mixing attachment (such as a beater cage, a mixing hook, a mixing rod, etc.) for mixing and chopping food and a drive device for driving the attachment. A drive motor in the drive device drives the mixing attachment via a transmission mechanism and sets the attachment in a rotary movement for mixing and chopping the food.

However, the transmission mechanism in the current common hand mixer (whether the planetary gear holder as the output for the rotation, or the fixed shaft wheel as the output for the rotation (i.e., the mixing parts rotate on a fixed shaft)) have one thing in common The transmission mechanism can only rotate the attachment quickly in the flat area. That is, the attachment has a two-dimensional movement path, and the food is stirred in this flat area, the mixing effect and the mixing efficiency being relatively low.

Therefore, an earlier application by the present applicant solves "Transmission Mechanism for Three-Dimensional Mixing" (Disclosure Number: CN206746430U ) as an answer to the above mentioned status quo this technical problem effectively. An output spindle of the transmission mechanism drives a mixing shaft via a bevel planetary gear. The axis of the mixing shaft and the axis of the output spindle form an acute axial angle of intersection. In this way, the bevel planetary gear drives the mixing shaft to rotate in the cone bus (self-rotation), and the mixing shaft follows the bevel planetary gear holder in order to rotate in the plane (revolution). Due to the inclined rotation and the revolution in the plane, the mixing attachment can form a three-dimensional path. In this way, the transmission mechanism can achieve a three-dimensional mixing, compared to the traditional mixing attachment, mixing can only be carried out in the flat area, the mixing effect and efficiency are greatly improved.

The hand mixer when the attachment speed is low, the user is more convenient to use, and the safety is also good. And this transmission mechanism is more restricted in its reduction ratio due to its structural limitation. In order to increase the gear ratio, the number of teeth of the internal bevel gear and the bevel planetary gear must be increased, which is inevitably achieved by increasing the radial size of the wheel under the condition of ensuring the strength of the wheel. This increases the volume and does not correspond to the trend towards miniaturization, portability and personalization of handheld devices for the food industry.

Therefore, the existing transmission mechanism used in hand mixers can be further improved.

Content of the utility model

The first technical problem to be solved by the present utility model is to provide a compact and large-sized duplex bevel planetary gear transmission mechanism with which three-dimensional mixing can be achieved while reducing the mixing speed of the attachment and reducing product vibration.

The second technical problem to be solved by the present utility model is to provide a hand mixer with the above-mentioned transmission mechanism, which is easy and convenient to operate and has good security.

In order to achieve the above purpose, the present utility model provides a duplex bevel planetary gear transmission mechanism comprising: an active bevel gear directly or indirectly driven by a motor; an internal bevel gear, in a non-rotatable fixed setting; a bevel pinion mount rotatably mounted within the internal bevel gear; and at least two duplex bevel planetary gears evenly spaced along a circumference mounted on the bevel planetary gear holder; wherein an upper bevel gear of each of the duplex bevel planetary gears engages the active bevel gear and a lower bevel gear of each of the duplex bevel planetary gears engages the internal bevel gear; wherein one of the duplex bevel planetary gears is an output gear for connection to a mixing attachment; an axial intersection angle a, which is between the axis of the duplex Bevel planetary gear is formed as the output gear and the axis of the active bevel gear is pointed.

If the number of teeth of the above active bevel gear is set to Z1, the number of teeth of the upper bevel gear of the duplex bevel planetary gear is set to Z2, the number of teeth of the lower bevel gear is set to Z3 and the number of teeth of the internal bevel gear is set to Z4, then the gear ratio is set of the above duplex bevel planetary gear mechanism i = 1 + (Z2 * Z4) / (Z1 * Z3), as in 8th shown; and the gear ratio of the single link bevel planetary gear is i = 1 + Z4 / Z1 (the number of teeth on the active bevel gear on Z1, the number of teeth on the bevel planetary gear on Z2, and the number of teeth on the internal bevel gear on Z4), as in 7th shown. Therefore, it can be seen from the gear ratio formula that changing the number of teeth Z2 and Z3 of the duplex bevel planetary gear can change the gear ratio in a wider range, and thus the mechanism has a large gear ratio but the radial dimension is small.

The axial cutting angle α can have an angular range between 8 ° and 35 °. This angular range ensures that the mixing attachment stirs in the correct range, with a moderate mixing range and good mixing results.

The bevel planetary gear holder and the internal bevel gear are provided with an iron ring as a bearing for the bevel planetary gear holder to enable it to rotate in the plane around its own axis within the internal bevel gear.

The active bevel gear is preferably driven indirectly by a motor and is connected between the motor and the active bevel gear by a transmission arrangement. In this way, the transmission mechanism of the present utility model can form a drive of the second stage, the transmission arrangement representing the drive of the first stage, which can use a duplex or single-link spur planetary gear mechanism, which in particular comprises: a sun gear connected to an output shaft the engine is attached; an internal spur gear, in a non-rotatable fixed setting; a spur planetary gear holder rotatably mounted within the internal gear; and a plurality of face planetary gears equally spaced along a circumference mounted on the face planetary gear mount; wherein each of the spur planetary gears is either a duplex spur planetary gear or a single link spur planetary gear; when the duplex spur planetary gear is used, an upper spur gear of each duplex spur planetary gear engages the sun gear and a lower spur gear engages the inner spur gear; when the single link spur planetary gear is used, each single link spur planetary gear meshes with both the sun gear and the internal spur gear; wherein the active bevel gear is arranged on the face planetary gear holder to rotate in synchronism with the face planetary gear holder; the active bevel gear drives the duplex bevel planetary gear mechanism of the second stage.

The face planetary gear holder consists of an upper holder and a lower holder; the sun gear and each of the planetary spur gears are clamped between the upper bracket and lower bracket; the active bevel gear is constructed in one piece with the lower bracket and is arranged on an underside of the lower bracket. As a result, the lower bracket at the output of the first stage and the active bevel gear at the input of the second stage are integrated, which leads to a very compact design.

To control the axial play of each of the duplex bevel planetary gears, the underside of the lower bracket is also provided with a shoulder surface.

The internal spur gear is integrally connected to the internal bevel gear at the top and bottom, so that the two-stage transmission mechanism is thus accommodated in the cavity formed by the internal gear and the internal bevel gear.

In order to achieve the above-mentioned purpose, the present utility model provides a hand mixer comprising: a housing, a mixing attachment, and the duplex bevel planetary gear transmission mechanism, the duplex bevel planetary gear transmission mechanism being arranged in the housing, the internal bevel gear being fixed with the housing is provided; wherein the mixing attachment is detachably connected to the duplex bevel planetary gear as an output gear; a combined effect of the duplex bevel planetary gear and the bevel planetary gear holder causes the mixing attachment to rotate in three dimensions. Therefore, no manual movements are required to adjust the mixing effect, and the low speed of the attachment makes it easy and convenient to operate.

To enable quick assembly and disassembly of the mixing attachment, the duplex bevel planetary gear is also provided as an output gear with an axially downwardly extending connecting shaft section for connecting the mixing attachment, the connecting shaft section has a socket for the mixing attachment therein, and the socket is blind to to prevent the attachment from coming into contact with the wheel grease and to ensure food safety.

The connecting shaft section is provided with an annular slot in the outer circle of the end, and the slot is provided with a spring for quick assembly and disassembly of the mixer attachment.

The advantages of the present utility model compared to the prior art are.

1. Adopting a duplex bevel planetary gear mechanism, with a large gear ratio but small radial dimension, thereby reducing the speed of the attachment, reducing product vibration, convenient operation, good safety and no hand injury.

2. Adoption of a duplex bevel planetary gear mechanism, with the duplex bevel planetary gears and the bevel planetary gear holder acting as the output end at the same time, so that the movement of the mixing attachment is a three-dimensional planetary rotation caused by the oblique rotation of the duplex bevel planetary gear with simultaneous planar revolution of the Bevel planetary gear bracket is generated (the rotation axis of the duplex bevel planetary gear changes according to the cone), so the mixing efficiency and the effect are better.

3. With a second stage drive that can continue to make a large gear ratio and achieve a very large gear ratio.

4. The lower bracket of the spur planetary gear bracket of the first stage output is integrated with the active bevel gear of the second stage input, making the structure more compact.

Figure list

• 1 Fig. 3 is a structural schematic representation of an embodiment of the present utility model.
• 2 Figure 13 is a schematic representation of one form of embodiment of the present utility model.
• 3 is a schematic representation of a three-dimensional exploded drawing of a transmission mechanism (with egg-breaking cage) according to an embodiment of the present utility model.
• 4th is a schematic representation of a lower bracket of a face planetary gear, which is designed as an integral structure with an active bevel gear.
• 5 Figure 13 is a schematic section showing a second stage of a duplex bevel planetary gear mechanism.
• 6th Figure 3 is a three-dimensional schematic representation of a variety of mixing attachments.
• 7th Fig. 13 is a schematic diagram showing the driving principle of the single link bevel planetary gear mechanism.
• 8th Fig. 13 is a schematic diagram showing the driving principle of the duplex bevel planetary gear mechanism.

Detailed description of the embodiments

The present utility model is described in more detail below in conjunction with the accompanying drawings and exemplary embodiments.

As in the 1 until 8th As shown, a preferred embodiment of the present utility model is a hand mixer which is equipped with a plurality of mixing attachments. The hand mixer essentially comprises a housing 3 , one in the case 3 provided duplex bevel planetary gear transmission mechanism 2 , an engine 1 to drive the rotation of the transmission mechanism 2 , and a variety of mixing attachments 4th . The stirring attachments 4th include a conventionally designed impact cage 4c , a mixing hook 4a and a mixer 4b (as in 6th shown).

The duplex bevel planetary gear transmission mechanism 2 This embodiment is a two-stage drive, the first stage being a duplex spur planetary gear mechanism 2a and the second stage, a duplex bevel planetary gear mechanism 2 B is.

The duplex planetary gear mechanism 2a the first stage includes a sun gear 21 , three duplex planetary gears 22nd , a spur planetary gear holder 23 and an internal spur gear 24 . The planetary gear holder 23 is made by combining upper and lower brackets 23a , 23b educated. The top and bottom brackets 23a , 23b are in the shape of circular studs and are provided with connecting posts and connecting holes for interconnection. The sun gear 21 and three duplex planetary gears evenly distributed over the circumference 22nd are between the upper and lower brackets 23a , 23b clamped, with three wheel shafts protruding upwards in the lower bracket 23b . The three duplex planetary gears 22nd are mounted on the wheel shafts, and the centrally arranged sun gear 21 on an output shaft of the engine 1 is attached. In the middle of the top bracket 23a is a circular one hole 231 provided through which the output shaft of the engine 1 is passed through so that the upper and lower brackets 23a , 23b when connected to each other as an integrated module in the internal spur gear 24 can be used. This internal spur gear 24 has a collar shape relative to the housing 3 is fixed, ie the internal spur gear 24 cannot be rotated. An upper spur gear engages after assembly 221 each duplex planetary gear 22nd in the sun gear 21 and a lower spur gear 222 in the internal spur gear 24 a (as a reduction mechanism, the upper spur gear 221 of the duplex spur planetary gear has a larger outer diameter than the lower spur gear 222 , ie the upper spur gear 221 has more teeth than the lower spur gear 222 ).

When the engine is switched on 1 the output shaft of the motor rotate 1 and the sun gear on it 21 . Because the top spur gear 221 each duplex planetary gear 22nd in the sun gear 21 and the lower spur gear 222 in the internal spur gear 24 engages, drives the sun gear 21 via the duplex planetary gear 22nd the planetary gear holder 23 for planar rotation (each duplex face planetary gear 22nd rotates with the spur planetary gear holder 23 and at the same time about yourself). The planetary gear holder 23 is used as the output end of the first stage drive and also as the input end of the second stage drive. An active bevel gear 25th in the duplex bevel planetary gear mechanism 2 B the second stage is integral to the bottom of the lower bracket 23b formed so that the lower bracket 23b at the output end of the first stage in one piece with the active bevel gear 25th at the entrance end of the second stage is established what the entire transmission mechanism 2 makes it very compact and thus the mixers are made more compact. And to prevent any duplex bevel planetary gear 26th the second stage running axially is also a shoulder surface 232 on the underside of the lower bracket 23b intended. The shoulder surface 232 can be a circular table surface at the bottom of the lower bracket 23b being.

The duplex planetary gear mechanism 2 B the second stage comprises the active bevel gear described above 25th , three duplex bevel planetary gears 26th , a bevel planetary gear holder 27 and an internal bevel gear 28 .

The internal bevel gear 28 has a non-straight collar shape with unequal upper and lower outer diameters, the upper outer diameter being larger than the lower outer diameter and conical teeth on the inner wall at the transition between the upper and lower part. In addition, the internal bevel gear is 28 with an annular step 281 near the lower connection, which is used to hold an iron ring 29 can be used. The internal bevel gear 28 is just like the internal spur gear 24 relative to the housing 3 fixed and cannot be rotated, its upper connection is the lower connection of the internal spur gear 24 facing, and the two are connected as a unit, so that the gears and brackets of the two-stage transmission mechanism are thus in place by the internal spur gear 24 and the internal bevel gear 28 formed cavity are housed.

The bevel planetary gear holder 27 is located inside the internal bevel gear 28 and is at its base by the iron ring 29 worn, which acts as a bearing bracket, so that the bevel planetary gear holder 27 smoothly inside the internal bevel gear 28 can turn. This iron ring 29 gets to the ring-shaped step 281 of the internal bevel gear 28 put on.

The three duplex bevel planetary gears 26th , one of which as an output wheel for connection to the mixer attachment 4th serves and the other two as differential gears, which balance the forces on the output gear. This arrangement reduces the vibrations of the mixer and further improves the ease of use. The three duplex bevel planetary gears 26th are all on the bevel planetary gear holder 27 mounted and evenly arranged at a circumferential distance of 120 °. In particular, the bevel planetary gear holder 27 two wheel shafts 271 that extend obliquely upwards, and a perforation 272 which is sloping downwards and through the bottom of the bevel planetary gear holder 27 extends therethrough. The two compensating duplex bevel planetary gears 26a on the wheel shafts 271 are rotatably mounted, while the other duplex bevel planetary gear 26b , the one with the mixing attachment 4th is connected, with its lower connecting shaft portion 263 on the perforation 272 is stored. The intersection angle α between the axis of this connecting shaft section 263 and the axis of the active bevel gear 25th is acute, and the acute angle can be selected between 8 ° and 35 °. This angular range ensures that the mixing attachment 4th is stirred in a suitable room, with a moderate mixing amplitude and a good mixing effect. Therefore, the structure of the duplex bevel planetary gear differs 26b as the output end of that of the other two duplex bevel planetary gears 26a , in addition to the upper part with integrated upper and lower bevel gears 261 , 262 it is also axially downward with the connecting shaft section 263 extended by the perforation 272 can pass through, and the connecting shaft portion 263 has a socket 264 for the mixer attachment 4th . And to prevent the essay 4th comes into contact with the wheel grease, and to ensure food safety, the bushing is 264 blind. A annular slot 265 is also in the outer circle of the end of the connecting shaft section 263 provided and a spring 5 is in the slot 265 provided to a clamp 41 on the essay 4th to keep. This enables quick assembly and disassembly just by pulling or pushing the mixer attachment 4th and utilizing the elastic expansion and the elastic retraction of the spring 5 so that the essay 4th can be pulled out or inserted.

After assembly, the upper bevel gear engages 261 of the three duplex bevel planetary gears 26th into the active bevel gear 25th and the lower bevel gear 262 into the internal bevel gear 28 a (also called a reduction gear is the outer diameter of the upper bevel gear 261 larger than the outer diameter of the lower bevel gear 262 the duplex bevel planetary gears 26th , ie the number of teeth on the upper bevel gear 261 is greater than the number of teeth on the lower bevel gear 262 ). This is how the active bevel gear drives 25th that is synchronized with the planetary gear holder 23 the first stage rotates each of the duplex bevel planetary gears 26th for rotation, in turn via the internal bevel gear 28 the bevel planetary gear holder 27 rotates so that each of the duplex bevel planetary gears 26th rotates obliquely by itself, while it is metric with the bevel planetary gear holder 27 rotates.

In combination with 8th if the duplex bevel planetary gear 26b as the exit end is the bevel planetary gear bracket 27 also as the output end (A in the figure denotes the input, B the output of the single link bevel planetary gear mechanism, B1 the output of the mounting end of the duplex bevel planetary gear mechanism and B2 the output of the wheel end of the duplex bevel planetary gear mechanism), so that the Movement of the attachment 4th is a three-dimensional planetary rotation caused by the oblique rotation of the duplex bevel planetary gear 26b with a simultaneous planar revolution of the bevel planetary gear holder 27 is produced. Hence, the food mixing process makes three-dimensional mixing, and the speed of the attachment 4th is low (can reduce the speed of existing products by more than 35%) and the vibration is low, so there is no need to adjust the mixing effect by manual movement, and the mixing quality is good, and the operation is easy and convenient and secure.

The above described is only a preferred embodiment of the present utility model, but it should be clearly understood that various adaptations and variations of the present invention are possible for those skilled in the art. Every modification, every equivalent replacement, every improvement, etc. that is made within the scope of the spirit and principles of this utility model falls within the scope of protection of this utility model. For example, the duplex bevel planetary gear mechanism of the first stage can also be a single link spur planetary gear mechanism. When a single link spur planetary gear mechanism is used, each single link spur planetary gear mechanism engages both the sun gear and the inner spur gear, and drives the sun gear of the spur planetary gear mount for planar rotation through the single link spur planetary gear, which is also used in The active bevel gear integrated in the lower bracket of the spur planetary gear bracket rotates. It is also possible to mount the active bevel gear directly on the motor output shaft and to drive it directly by the motor without the drive of the first stage, which can also achieve the purpose of the present utility model. The number of duplex bevel planetary gears in the second stage drive can be two, one of which is used as the gear for balance and the other as the gear for output. In short, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of this utility model falls within the scope of this utility model.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CN 206746430 U [0005]

Claims (10)

A duplex bevel planetary gear transmission mechanism (2) comprising: an active bevel gear (25) which is driven directly or indirectly by a motor (1); an internal bevel gear (28), in a non-rotatable fixed setting; a bevel pinion mount (27) rotatably mounted within the inner bevel gear (28); and at least two duplex bevel planetary gears (26) which are evenly spaced along a circumference mounted on the bevel planetary gear holder (27); an upper bevel gear (261) of each of the duplex bevel planetary gears (26) engaging the active bevel gear (25) and a lower bevel gear (262) of each of the duplex bevel planetary gears (26) engaging the inner bevel gear (28); wherein one of the duplex bevel planetary gears (26) is an output gear for connection to a mixing attachment (4); an axial intersection angle α, which is formed between the axis of the duplex bevel planetary gear (26) as the output gear and the axis of the active bevel gear (25), is acute. Duplex bevel planetary gear transmission mechanism (2) according to Claim 1 wherein the active bevel gear (25) is indirectly driven in front of the motor (1) via a transmission arrangement using a planetary gear mechanism and comprising: a sun gear (21) attached to an output shaft of the motor (1); an internal spur gear (24), in a non-rotatable fixed setting; a spur planetary gear holder (23) rotatably mounted within the internal spur gear (24); and a plurality of spur planetary gears evenly spaced along a circumference mounted on the spur planetary gear holder (23); wherein each of the spur planetary gears is either a duplex spur planetary gear or a single link spur planetary gear; when the duplex spur planetary gear (22) is used, an upper spur gear (221) of each duplex spur planetary gear (22) engages the sun gear (21) and a lower spur gear (222) engages the internal spur gear (24); when the single link spur planetary gear is used, each single link spur planetary gear meshes with both the sun gear (21) and the internal spur gear (24); wherein the active bevel gear (25) is arranged on the spur planetary gear holder (23) to rotate synchronously with the spur planetary gear holder (23). Duplex bevel planetary gear transmission mechanism (2) according to Claim 2 , wherein the spur planetary gear holder (23) consists of an upper holder (23a) and a lower holder (23b); the sun gear (21) and each of the spur planetary gears are clamped between the upper bracket (23a) and lower bracket (23b); the active bevel gear (25) is constructed in one piece with the lower bracket (23b) and is arranged on an underside of the lower bracket (23b). Duplex bevel planetary gear transmission mechanism (2) according to Claim 3 , wherein the underside of the lower bracket is provided with a shoulder surface (232) to control the axial concentricity of the duplex bevel planetary gears (26). Duplex bevel planetary gear transmission mechanism (2) according to Claim 2 , wherein the internal spur gear (24) is integrally connected to the internal bevel gear (28) at the top and bottom. Duplex bevel planetary gear transmission mechanism (2) according to one of the Claims 1 - 5 , wherein the axial angle of intersection α has an angular range between 8 ° and 35 °. Duplex bevel planetary gear transmission mechanism (2) according to Claim 6 , wherein the bevel planetary gear holder (27) and the inner bevel gear (28) are provided with an iron ring (29) which acts as a bearing carrier. A hand mixer, comprising a housing (3), a mixing attachment (4), and a duplex bevel planetary gear transmission mechanism (2) according to one of the Claims 1 until 7th wherein the duplex bevel planetary gear transmission mechanism (2) is arranged in the housing (3), the inner bevel gear (28) being fixedly provided with the housing (3); wherein the mixing attachment (4) is detachably connected to the duplex bevel planetary gear (26) as an output gear; a combined effect of the duplex bevel planetary gear (26) and the bevel planetary gear holder (27) causes the mixing attachment (4) to rotate in three dimensions. Hand mixer after Claim 8 , wherein the duplex bevel planetary gear (26) is also provided as an output gear with an axially downwardly extending connecting shaft section (263) for connecting the mixing attachment (4), the connecting shaft section (263) has a socket (264) therein for the mixing attachment (4) and the socket (264) is blind. Hand mixer after Claim 9 wherein the connecting shaft section (263) is provided with an annular slot (265) in the outer circle of the end, and the slot (265) is provided with a spring (5) for quick assembly and disassembly of the mixing attachment (4).

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