TWM619812U - Wide heating value gas stove - Google Patents

Abstract

A wide-calorific value gas stove, comprising a furnace body, a furnace head, a gas regulating valve, and a gas mixing adjustment device, wherein the furnace head includes a gas inlet pipe, and the gas inlet pipe has a gas inlet. The gas regulating valve is provided with a nozzle. The nozzle is used to output gas into the air inlet pipe, and introduce the air outside the air inlet into the air inlet pipe to form primary air for combustion. The air mixing adjusting device includes an adjusting member that can be manipulated to switch between a first state and a second state to change the flow of gas from the nozzle into the air inlet pipe or change the flow of primary air entering the air pipe, Among them, the first state corresponds to the first natural gas, and the second state corresponds to the second natural gas. In this way, the user can adjust the adjusting element according to whether the gas is the first natural gas or the second natural gas, so as to achieve a good combustion efficiency.

Description

Wide calorific value gas stove

This creation is related to gas stoves; in particular, it refers to a gas stove with a wide heating value that uses natural gas.

Figure 1 shows a conventional gas stove 100 using natural gas, which includes a furnace body 10, a furnace head 12, and a gas regulating valve 14. The furnace head 12 is disposed inside the furnace body 10. The furnace head 12 includes a head 122 and an air inlet tube 124. The head 122 has a plurality of flame holes 122 a, and the air inlet tube 124 has an air inlet 124 a. The gas regulating valve 14 has an inlet end 142 and an outlet end 144, the inlet end 142 is connected to a gas supply pipe 16, and the outlet end 144 is provided with a nozzle 18. The nozzle 18 faces the inside of the air inlet pipe 124. The gas regulating valve 14 is connected to a knob 20. When the user turns the knob 20, the gas passing through the gas regulating valve 14 can be adjusted. After the gas is output from the nozzle 18, it is injected into the air inlet pipe 124, and at the same time, the primary air outside the air inlet 124a is introduced.

The natural gas used in the gas furnace 100 is delivered by the gas company to the user via a pipeline. The calorific value of natural gas varies from place to place. In order to avoid the difference in calorific value from affecting the combustion efficiency and safety of the gas stove 100 on the user side, the gas company usually only supplies natural gas with the same calorific value to the user side on the same transmission pipeline.

When the calorific value of the natural gas purchased by the gas company changes, for example, when the natural gas with low calorific value is purchased instead of natural gas with high calorific value, if the high calorific value natural gas is directly injected into the transmission pipeline, the nozzle 18 of the gas furnace 100 The aperture is fixed, which will cause the user In the case of incomplete combustion of the gas in the gas stove 100, there is a danger of excessive carbon monoxide. On the contrary, if the natural gas with high calorific value is directly injected into the transmission pipeline, the combustion efficiency of the user's gas stove 100 will be poor.

In view of this, the purpose of this creation is to provide a wide heating value gas stove, which can adjust the ratio of the gas flow from the nozzle into the air inlet pipe to the primary air flow, so as to be suitable for natural gas with different heating values.

In order to achieve the above-mentioned purpose, this creation provides a wide-calorific value gas stove, which is used to connect a gas supply pipe, the gas supply pipe is used to input gas, and the gas is one of a first natural gas and a second natural gas, and The first natural gas and the second natural gas have different heating values; the wide heating value gas furnace includes a furnace body, a furnace head, a gas regulating valve, and a gas mixing adjustment device, wherein the furnace head is arranged on the furnace body It also includes a head and an air inlet tube, wherein the head has a plurality of flame holes, the air inlet tube communicates with the head and has an air inlet; the gas regulating valve is controlled to regulate the flow of gas passing through; the The gas regulating valve has an inlet end and an outlet end, the inlet end is connected with the gas supply pipe; the outlet end is provided with a nozzle, the nozzle corresponds to the gas inlet of the gas pipe and outputs gas to the gas pipe, and the inlet The air outside the air port is introduced into the air inlet pipe to form primary air for combustion; the air mixing adjusting device includes an adjusting member located at the air inlet, and the adjusting member can be manipulated to switch between a first state and a second state, To change the flow of gas entering the air inlet pipe from the nozzle or to change the flow rate of the primary air entering the air inlet pipe, wherein the first state corresponds to the first natural gas and the second state corresponds to the second natural gas.

The effect of this creation is that the gas mixing adjustment device allows the user to adjust the gas flow rate or Change the flow rate of the primary air entering the air inlet pipe, and then change the ratio of the gas flow rate from the nozzle into the air inlet pipe to the flow rate of the primary air, so as to achieve good combustion efficiency.

[Traditional]

100: Gas stove

10: Furnace

12: burner

122: head

122a: flame hole

124: Into the trachea

124a: Inlet

14: Gas regulating valve

142: entry side

144: export end

16: Gas supply pipe

18: Nozzle

20: knob

[This creation]

1: Wide calorific value gas stove

22: Furnace

222: accommodating space

224: open

226: Stove

24: burner

26: head

262: Flame Hole

28: Into the trachea

282: air inlet

30: Gas regulating valve

302: Entry side

304: export end

32: Nozzle

32a: central axis

322: output hole

324: first connection part

324a: Ring flange

326: first stop

328: second stop

34: Spinning rod

36: Knob

38: Mixing adjustment device

40: Adjusting parts

40a: Center of rotation

402: first adjustment hole

404: second adjustment hole

406: second connection part

406a: socket hole

406b: ring groove

408: Stop

2: Wide calorific value gas stove

42: Controller

44: Toggle switch

46: Mixing adjustment device

48: drive module

482: Motor

482a: output shaft

484: drive disk

484a: second tooth

50: Adjusting parts

50a: Center of rotation

502: first tooth

504: The first adjustment hole

506: second adjustment hole

3: Wide calorific value gas stove

52: Nozzle

522: output hole

54: Into the trachea

542: air inlet

56: Adjusting parts

562: Baffle

562a: Perforation

4: Wide calorific value gas stove

58: Controller

60: Toggle switch

62: Mixing adjustment device

64: drive module

642: Motor

642a: output shaft

644: drive disk

644a: second tooth

66: Adjusting parts

662: gear

662a: first tooth

P: Gas supply pipe

P1: first position

P2: second position

Figure 1 is a schematic diagram of a conventional gas stove.

Fig. 2 is a schematic diagram of the wide heating value gas stove created in the first preferred embodiment.

Fig. 3 is a schematic diagram of the adjusting member in the first state of the first preferred embodiment of the creation.

Fig. 4 is a cross-sectional view of Fig. 3 in the direction of 4-4.

Fig. 5 is a schematic diagram of the adjustment member in the second state of the first preferred embodiment of the creation.

Fig. 6 is a cross-sectional view along the line 6-6 of Fig. 5;

Fig. 7 is a schematic diagram of the tile-width heating value gas stove of the second preferred embodiment of the creation.

Fig. 8 is a schematic diagram of the adjustment member in the first state of the creation of the second preferred embodiment.

Fig. 9 is a schematic diagram of the adjustment member in the second state of the creation of the second preferred embodiment.

Fig. 10 is a schematic diagram of the tile-width heating value gas stove of the third preferred embodiment of the creation.

Fig. 11 is a schematic diagram of the adjustment member in the first state of the third preferred embodiment of the creation.

Fig. 12 is a schematic diagram of the adjustment member in the second state of the third preferred embodiment of the creation.

Fig. 13 is a schematic diagram of the tile-width heating value gas stove of the fourth preferred embodiment of the creation.

In order to explain the creation more clearly, the preferred embodiments are described in detail in conjunction with the drawings as follows. Please refer to Figures 2 to 6, which are the first preferred embodiment of the creation of the wide heating value gas stove 1 which is used to connect to a gas supply pipe P which is used to input gas. The gas is natural gas and It is supplied by the gas company. Gas is one of a first natural gas and a second natural gas, and the first natural gas and the second natural gas have different heating values. In this embodiment, the heating value of the first natural gas is 8900Kcal/M ³ as an example. The calorific value of the second natural gas is 9700Kcal/M ³ as an example, but it is not limited to this. The wide heating value gas furnace 1 includes a furnace body 22, a furnace head 24, a gas regulating valve 30 and a gas mixing regulating device 38.

The furnace body 22 has an accommodating space 222 inside and an opening 224 at the top. A hob 226 is provided around the opening 224 for pots and pans to be placed.

The furnace head 24 is disposed in the accommodating space 222 of the furnace body 22. The furnace head 24 includes a head 26 and at least one gas inlet pipe 28. The head 26 has a plurality of flame holes 262. The gas inlet pipe 28 and the gas inlet pipe 28 The inside of the head 26 communicates with the flame hole 262 and has an air inlet 282. An igniter (not shown) can be provided beside the head 26 to ignite the gas output from the flame hole 262.

The gas regulating valve 30 is controlled to regulate the flow of gas passing through. The gas regulating valve 30 has an inlet end 302 and an outlet end 304, the inlet end 302 is connected to the gas supply pipe P; the outlet end 304 is provided with a nozzle 32 corresponding to the gas inlet of the gas inlet pipe 28 and output gas Into the air inlet pipe 28, and introduce the air outside the air inlet 282 into the air inlet pipe 28 to form primary air for combustion. The secondary air is supplied from around the flame hole 262 of the burner 24.

In this embodiment, the gas regulating valve 30 takes a manual regulating valve as an example. The internal passage of the gas regulating valve 30 is provided with a flow regulating member such as a closure (not shown) as an example, and the closure is connected to a rotating rod 34 A knob 36 is connected to one end of the rotating rod 34 and the other end of the rotating rod 34. When the user manually rotates the knob 36, the shutter can be driven to adjust the flow of gas passing through. In other embodiments, the gas regulating valve 30 may also be an electric gas regulating valve that uses a motor to drive a flow regulating member.

The air mixing adjusting device 38 includes an adjusting member 40 located at the air inlet 282. The adjusting member 40 can be manipulated to switch between a first state and a second state to change from the The gas flow rate from the nozzle into the gas inlet pipe 28, wherein the first state corresponds to the first natural gas, and the second state corresponds to the second natural gas.

In this embodiment, the nozzle 32 has an output hole 322. The adjusting member 40 is disposed on the nozzle 32 and has a first adjusting hole 402 and a second adjusting hole 404. The diameter of the first adjusting hole 402 is larger than that of the second adjusting hole 404. 2. Adjust the aperture of the hole 404. The adjusting member 40 switches between the first state and the second state in a rotatable manner, as shown in FIGS. 3 and 4, when the adjusting member 40 is switched to the first state, the first adjusting hole 402 Correspond to the output hole 322. As shown in FIGS. 5 and 6, when the adjusting member 40 is switched to the second state, the second adjusting hole 404 corresponds to the output hole 322. .

In more detail, the outer ring of the nozzle 32 has a first connecting portion 324. The first connecting portion 324 may include an annular flange 324a and protrude radially outward. The output hole 322 is located at the center of the nozzle 32. One side of axis 32a. The adjusting member 40 has a second connecting portion 406. The second connecting portion 406 may include a socket hole 406a and a ring groove 406b on the wall of the hole. The socket hole 406a is rotatably socketed on the first connecting portion 324 , And the annular flange 324a extends into the annular groove 406b, so that the adjusting member 40 can rotate relative to the nozzle 32. The first adjusting hole 402 and the second adjusting hole 404 are respectively located on one side of a rotation center 40 a of the adjusting member 40. In this embodiment, the distance from the center of the first adjusting hole 402 and the center of the second adjusting hole 404 to the rotation center 40a is equal. The central angle between the center of the first adjusting hole 402 and the center of the second adjusting hole 404 relative to the rotation center 40a is 180 degrees.

In addition, the outer ring surface of the nozzle 32 has a first stop portion 326 and a second stop portion 328 in two different radial directions, respectively. The adjusting member 40 has a stopper 408, and the stopper 408 can move between the first stopper 326 and the second stopper 328 as the adjuster 40 rotates. 3 and 4, when the adjusting member 40 is rotated so that the stopper 408 is against the first stop portion 326, that is, in the first state, the first adjusting hole 402 corresponds to the output hole 322; please cooperate with FIG. 5 and In FIG. 6, when the adjusting member 40 is rotated to make the stopper 408 abut against the second stopping portion 328, that is, in the second state, the second adjusting hole 404 corresponds to the output hole 322. In this way, the purpose of positioning can be achieved.

The user can rotate the adjusting member 40 because the gas input from the gas supply pipe P is the first natural gas or the second natural gas. For example, please refer to Figs. 3 and 4. When it is the first natural gas, the user can rotate the adjusting member to make the first adjusting hole 402 correspond to the output hole 322. When the gas is changed to a second natural gas with a higher calorific value, the user can rotate the adjusting member 40 so that the second adjusting hole 404 corresponds to the output hole 322, so that the gas flow rate becomes smaller. vice versa. In this way, the ratio of the gas flow entering the air inlet pipe from the nozzle 32 to the primary air flow can be changed by changing the gas flow to respond to natural gas with different calorific values.

Figures 7 to 9 show the wide-calorific value gas stove 2 of the second preferred embodiment of the creation, which has substantially the same structure as the first embodiment. The difference is that the wide-calorific value gas stove 2 further includes a The controller 42 and a switch 44 are electrically connected to the switch 44, and the switch 44 can be operated by the user to change the state, for example, between a first switching state and a second switching state Variety. The air mixing adjusting device 46 of this embodiment includes a driving module 48 connected to the controller 42 and the adjusting member 50; wherein, the driving module 48 includes a motor 482 and a driving disk 484, the motor 482 is electrically connected to the controller 42, and the drive plate 484 is connected to the output shaft 482 a of the motor 482. The outer ring of the adjusting member 50 has a first tooth 502, which is indicated by a dotted chain line in FIGS. 8 and 9. The outer ring of the drive plate 484 has a second tooth 484a, and the second tooth 484a is shown by a dotted chain line in FIGS. 9 and 9. The second tooth portion 484 a meshes with the first tooth portion 502, so that the driving disc 484 is coupled between the output shaft 482 a of the motor 482 and the adjusting member 50.

The controller 42 controls the motor 482 to drive the drive plate 484 to rotate according to the state of the switch 44, so that the drive plate 484 drives the adjusting member 50 to rotate forward or reverse. With a predetermined angle, one of the first adjustment hole 504 and the second adjustment hole 506 corresponds to the output hole 322.

For example, please refer to FIG. 8. If the gas input to the gas supply pipe P is the first natural gas, the user operates the switch 44 to enter the first switching state, and the controller 42 controls the motor 482 to drive the drive plate 484 By rotating, the adjusting member 50 is switched to the first state, and the first adjusting hole 504 corresponds to the output hole 322. Please cooperate with Figure 9, when the gas is changed to the second natural gas, use the switch 44 to switch to the second switching state, the controller 42 controls the motor 482 to drive the drive plate 484 to rotate the predetermined angle, such as 180 degrees, The adjusting member 50 is switched to the second state, and the second adjusting hole 506 corresponds to the output hole 322. The predetermined angle can be designed according to the central angle between the center of the first adjusting hole 504 and the center of the second adjusting hole 506 with respect to the rotation center 50a, and is not limited to 180 degrees.

Thereby, the gas flow rate can be changed according to the natural gas of different calorific value, and then the ratio of the gas flow rate entering the air inlet pipe from the nozzle 32 to the flow rate of the primary air can be changed.

Figures 10 to 12 show the wide heating value gas stove 3 of the third preferred embodiment of creation, which has a structure substantially the same as that of the first embodiment. The difference is that the nozzle 52 is not provided with an adjusting member. The outlet hole 522 of 52 directly injects gas into the air inlet pipe 54. The air inlet 542 of the air inlet tube 54 has a non-circular shape.

As shown in Figs. 11 and 12, the central part of the air inlet 542 has a small opening, and the two sides have large openings. The adjusting member 56 includes a baffle 562 disposed on the outside of the air inlet of the air inlet pipe 54 and abutting against the outside of the air inlet 542, and the baffle 562 can be switched between the first state and the second state. The area of the center part of the shape of the baffle 562 is small, and the area of the two sides is large. The baffle plate 562 has a perforation 562a in the center, and the perforation 562a allows the nozzle 52 to pass through. The baffle 562 switches between the first state and the second state in a rotating manner. Please refer to FIG. 11, when the baffle 562 is switched to the first state, it is located at a first position P1, and the air inlet 542 is affected by the The baffle 562 covers less area, so that the air inlet 542 has a first opening area. Please refer to FIG. 12, when the baffle 562 is switched to the second state, it is in a second position P2, and the air inlet 542 has a larger area covered by the baffle 562, so that the air inlet 542 has a second opening The area of the second opening is different from the area of the first opening to change the flow rate of the primary air entering the air inlet pipe 54. In this embodiment, the area of the second opening is larger than the area of the first opening.

The user can rotate the baffle 562 to the first position P1 in response to the first natural gas, or rotate the baffle 562 to the second position P2 in response to the second natural gas, whereby the primary air introduced into the air pipe 54 is reduced The flow rate can be changed according to the first natural gas or the second natural gas, thereby changing the ratio of the flow of gas from the nozzle 52 into the air inlet pipe 54 to the flow of primary air.

Figure 13 shows the wide-calorific value gas stove 4 of the fourth preferred embodiment of the creation, which has substantially the same structure as the third embodiment, except that the wide-calorific value gas stove 4 further includes a controller 58 With a switch 60, the controller 58 is electrically connected to the switch 60, and the switch 60 can be operated by a user to change its state, for example, it can be changed between a first switch state and a second switch state. The air mixing adjusting device 62 includes a driving module 64 which is connected to the controller 58 and an adjusting member 66. The driving module 64 includes a motor 642 and a driving disk 644. The motor 642 is electrically connected. The controller 58 is sexually connected, and the drive disc 644 is coupled between the output shaft 642 a of the motor 642 and the adjusting member 66. In more detail, the adjusting member 66 includes a gear 662 coupled to the baffle 562. The outer ring of the gear 662 has a first tooth 662a, and the outer ring of the drive disc 644 has a second tooth 644a. , The second tooth part 644a meshes with the first tooth part 662a.

The controller 58 controls the motor 642 to drive the drive plate 644 to rotate according to the state of the switch 60, so that the drive plate 644 drives the adjusting member 66 to rotate forward or reverse a predetermined angle (take 90 degrees as an example). The piece 66 is switched between the first state and the second state In other words, the baffle 562 is rotated between the first position P1 and the second position P2. Thereby, the flow rate of the primary air entering the air inlet pipe 54 can also be changed, and thus the ratio of the flow rate of the gas entering the air inlet pipe 54 from the nozzle 52 to the flow rate of the primary air can be changed.

The adjusting member in the above embodiments is switched between the first state and the second state in a rotating manner. In practice, the adjusting member can also be designed to move between the two positions, and in the first state and the second state. State switching.

In addition, the gas inlet pipe of the furnace head of the above embodiments is described as an example. In practice, due to the design of the inner ring portion and the outer ring portion on the head, the gas inlet pipe can also be two and connect the inner ring portion and the outer ring portion respectively. Ring Department. There are two adjusting parts and they are located at the air inlets corresponding to the air inlet pipes.

According to the above, the wide-calorific value gas stove of this creation, through the gas mixing adjustment device, allows the user to adjust the gas flow from the nozzle into the gas inlet pipe or change the gas flow into the gas inlet pipe according to whether the gas is the first natural gas or the second natural gas. The primary air flow rate changes the ratio of the gas flow entering the air inlet pipe to the primary air flow rate so as to achieve good combustion efficiency.

The above descriptions are only the preferred and feasible embodiments of this creation. Any equivalent changes made in the application of this creation specification and the scope of patent application should be included in the patent scope of this creation.

1: Wide calorific value gas stove

22: Furnace

222: accommodating space

224: open

226: Stove

24: burner

26: head

262: Flame Hole

28: Into the trachea

282: air inlet

30: Gas regulating valve

302: Entry side

304: export end

32: Nozzle

34: Spinning rod

36: Knob

38: Mixing adjustment device

40: Adjusting parts

P: Gas supply pipe

Claims (14)

A gas stove with a wide heating value is used to connect a gas supply pipe for inputting gas. The gas is one of a first natural gas and a second natural gas, and the first natural gas and the second natural gas The heating value is different; the wide heating value gas stove includes: a furnace body; a furnace head, arranged in the furnace body and including a head and an air inlet pipe, wherein the head has a plurality of flame holes, the air inlet pipe and The head communicates with an air inlet; a gas regulating valve is controlled to regulate the flow of gas passing through; the gas regulating valve has an inlet end and an outlet end, the inlet end is connected to the gas supply pipe; the outlet end A nozzle is provided that corresponds to the air inlet of the air inlet pipe and outputs gas to the air inlet pipe, and introduces the air outside the air inlet into the air inlet pipe to form primary air for combustion; and an air mixing adjusting device, including a The adjusting member is located at the air inlet, and the adjusting member can be manipulated to switch between a first state and a second state to change the gas flow rate from the nozzle into the air inlet pipe or to change the primary air entering the air inlet pipe , Where the first state corresponds to the first natural gas, and the second state corresponds to the second natural gas. The wide-calorific value gas stove of claim 1, wherein the nozzle has an output hole; the adjusting member is disposed on the nozzle and has a first adjusting hole and a second adjusting hole, and the diameter of the first adjusting hole is larger than The aperture of the second adjustment hole; when the adjustment member is switched to the first state, the first adjustment hole corresponds to the output hole, and when the adjustment member is switched to the second state, the second adjustment hole corresponds to the output hole, In order to change the gas flow from the nozzle into the air inlet pipe. The wide-calorific value gas stove according to claim 2, wherein the nozzle has a first connecting portion, and the output hole is located on one side of the center axis of the nozzle; the adjusting member has a second connecting portion, the second connecting portion Part is rotatably sleeved on the first connecting part, so that the adjusting part can rotate The method is switched between the first state and the second state, and the first adjusting hole and the second adjusting hole are respectively located on one side of a rotation center of the adjusting member. The wide calorific value gas stove of claim 3, wherein the outer ring of the nozzle has a first stopper and a second stopper; the adjusting member has a stopper; rotating the adjusting member makes the stopper When the block is against the first stop, the first adjustment hole corresponds to the output hole; when the adjustment member is rotated to make the stop block against the second stop, the second adjustment hole corresponds to the output hole. The wide calorific value gas stove according to claim 3, comprising a controller and a switch, the controller is electrically connected to the switch; the air mixing adjusting device includes a driving module, the driving module is connected to the control The controller and the adjusting member; the controller controls the drive module to drive the adjusting member to rotate according to the state of the switch, so that one of the first adjusting hole and the second adjusting hole corresponds to the output hole. The wide heating value gas stove of claim 5, wherein the drive module includes a motor and a drive plate, the motor is electrically connected to the controller, and the drive plate is coupled to the output shaft of the motor and the adjusting member Between; The controller controls the motor to drive the drive plate to rotate, so that the drive plate drives the adjustment member to rotate. The wide calorific value gas stove according to claim 6, wherein the outer ring surface of the adjusting member has a first tooth portion, the outer ring surface of the drive disc has a second tooth portion, and the second tooth portion is connected to the first tooth portion. One tooth meshes. The wide heating value gas stove according to claim 1, wherein the adjusting member includes a baffle; when the baffle is switched to the first state, it is located at a first position so that the air inlet has a first opening area; When the baffle is switched to the second state, it is in a second position, the air inlet has a second opening area, and the second opening area is different from the first opening area to change the primary air entering the air inlet pipe Of traffic. The wide heating value gas stove according to claim 8, comprising a controller and a switch, the controller is electrically connected to the switch; the air mixing adjusting device includes a driving module, the driving module is connected to the control According to the state of the switch; the controller controls the drive module to drive the baffle of the adjusting member to rotate between the first position and the second position, so that the air inlet has the first position One of an opening area and the second opening area. The wide heating value gas stove according to claim 9, wherein the drive module includes a motor and a drive plate, the motor is electrically connected to the controller, and the drive plate is coupled to the output shaft of the motor and the adjusting member Between; The controller controls the motor to drive the drive plate to rotate, so that the drive plate drives the adjustment member to rotate. The wide calorific value gas stove according to claim 10, wherein the adjusting member has a first tooth portion, the outer ring of the drive disc has a second tooth portion, and the second tooth portion meshes with the first tooth portion . The wide calorific value gas stove according to claim 1, comprising a controller and a switch, the controller is electrically connected to the switch; the air mixing adjusting device includes a driving module, the driving module is connected to the control The controller and the adjusting member; the controller controls the drive module to drive the adjusting member to switch between the first state and the second state according to the state of the switch. The wide heating value gas stove of claim 12, wherein the drive module includes a motor and a drive plate, the motor is electrically connected to the controller, and the drive plate is coupled to the output shaft of the motor and the adjusting member Between; the controller controls the motor to drive the drive plate to rotate, so that the drive plate drives the adjusting member to switch between the first state and the second state in a rotating manner. The wide calorific value gas stove according to claim 13, wherein the adjusting member has a first tooth portion, the outer ring of the drive disc has a second tooth portion, and the second tooth portion meshes with the first tooth portion .

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