CN217161786U - Transmission shaft and cooking device - Google Patents

Abstract

The utility model provides a transmission shaft and culinary art device relates to cooking utensil technical field. The transmission shaft is a flexible body and axially extends from one end for connecting with a driving part to the other end for connecting with a driven part; wherein, the transmission shaft has along the recess of axial distribution. The utility model discloses a transmission shaft and culinary art device have effectively reduced the installation degree of difficulty of transmission shaft.

Description

Transmission shaft and cooking device

Technical Field

The utility model belongs to the technical field of the cooking utensil, more specifically relates to a transmission shaft and culinary art device.

Background

Cooking devices are devices that convert electrical energy or other energy sources into heat energy to heat food, and include all types of baking machines, pancake machines, electric baking pans, electric pressure cookers, electric rice cookers, stewpots, and the like. The related cooking device comprises a control button, a transmission shaft and a temperature control part, wherein the control button is mechanically transmitted through the transmission shaft to adjust the temperature control part, so that the temperature of the cooking device is controlled. But the related cooking device has a transmission shaft with a great difficulty in installing the control knob and the temperature control member.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a transmission shaft and culinary art device to solve the technical problem who how to reduce the transmission shaft installation degree of difficulty.

The technical scheme of the utility model is realized like this:

the embodiment of the utility model provides a transmission shaft, the transmission shaft is a flexible body, axially extends from one end for connecting a driving part to the other end for connecting a driven part; wherein the transmission shaft is provided with grooves distributed along the axial direction.

Further, the transmission shaft includes end walls provided at the one end and the other end and a side wall connecting the two end walls; wherein the groove is formed in the outer surface of the side wall.

Further, the number of the grooves is multiple, and the grooves are distributed at intervals in the axial direction; each groove extends at least partially along the circumferential direction.

Further, each of the grooves includes: two first grooves extending along the circumferential direction, wherein the two first grooves are distributed at intervals in the axial direction; and two opposite ends of the second groove are correspondingly connected with one ends of the two first grooves respectively.

Further, each groove encircles the surface of lateral wall end to end.

Further, the ratio of the depth of the groove to the diameter of the transmission shaft is greater than a first preset value.

Further, the length direction of the groove extends along the axial direction.

Further, the grooves are multiple and are distributed at intervals in the circumferential direction.

Further, the groove extends continuously from one end of the drive shaft in the axial direction to the other end of the drive shaft opposite to the one end.

Further, a plurality of grooves are provided at intervals in the axial direction from one end of the transmission shaft in the axial direction to the other end of the transmission shaft opposite to the transmission shaft.

Further, the groove extends spirally along the outer surface of the side wall around the axial direction.

Further, the groove is provided inside the transmission shaft so that the transmission shaft is formed into a hollow cylinder.

Further, the groove is coaxial with the transmission shaft.

Further, the groove is plural.

Further, the cross-section of the groove comprises at least one of the following shapes: circular, rectangular, regular polygonal.

Further, the transmission shaft includes: the groove is formed in the rotating shaft; the two connecting parts are respectively and correspondingly fixedly connected to the two opposite ends of the rotating shaft along the axial direction of the rotating shaft; the connecting part is provided with a positioning groove or a positioning bulge.

Further, the propeller shaft includes: the groove is formed in the rotating shaft; and the protective sleeve is sleeved on the rotating shaft and is fixedly connected with the rotating shaft.

Further, the propeller shaft includes: the two rotating shafts are arranged at intervals along the axial direction, and both the two rotating shafts are provided with the grooves; and the elastic element is arranged between the two rotating shafts in the axial direction and is fixedly connected with the two rotating shafts.

The utility model also provides a cooking device, include: a drive shaft, the drive shaft being any one of the drive shafts described above; the control button is the driving piece and is fixedly connected with one end of the transmission shaft; the temperature control part is the driven part and is fixedly connected with the other end of the transmission shaft; the control button is used for adjusting the temperature control piece.

The utility model discloses the transmission shaft is the flexible body, from the one end axial extension that is used for connecting the driving piece to being used for connecting the other end of driven piece to the transmission shaft has the recess that distributes along the axial. The utility model discloses a flexible body transmission shaft is through setting up the recess and adopting the flexible body that can buckle along axial direction to reduce the transmission shaft along axial direction's mass distribution, thereby reduce with the size of axial direction vertically moment, and then make the transmission shaft buckle more easily and/or distort with the driving piece and by the self-adaptation in-process that the driving piece was installed and is connected, effectively reduced the installation degree of difficulty of transmission shaft.

Drawings

Fig. 1 is a perspective view of a related cooking apparatus;

FIG. 2 is a schematic diagram of the working principle of a temperature control element of the cooking device;

fig. 3 is a schematic perspective view of a transmission shaft according to an embodiment of the present invention;

fig. 4 is a partial schematic view of a cooking device according to an embodiment of the present invention;

fig. 5a is a schematic structural diagram of a transmission shaft according to an embodiment of the present invention;

fig. 5b is a schematic structural view of another transmission shaft according to an embodiment of the present invention;

fig. 5c is a schematic structural view of another transmission shaft according to an embodiment of the present invention;

fig. 5d is a schematic structural diagram of another transmission shaft according to an embodiment of the present invention;

fig. 5e is a schematic structural diagram of another transmission shaft according to an embodiment of the present invention;

fig. 6a is a schematic structural view of a groove of a transmission shaft according to an embodiment of the present invention;

fig. 6b is a schematic structural view of another groove of the transmission shaft according to the embodiment of the present invention;

fig. 6c is a schematic structural view of another groove of the transmission shaft according to the embodiment of the present invention;

FIG. 6d is an enlarged partial schematic view of FIG. 6c at A;

fig. 7a is a schematic structural view of another groove of a transmission shaft according to an embodiment of the present invention;

fig. 7b is a schematic structural view of another groove of the transmission shaft according to the embodiment of the present invention;

fig. 8 is a schematic structural view of another groove of the transmission shaft according to the embodiment of the present invention;

fig. 9 is a sectional view of another groove of a drive shaft according to an embodiment of the present invention;

fig. 10a is a schematic structural view of a cross section of a transmission shaft according to an embodiment of the present invention;

fig. 10b is another schematic structural view of a cross section of a transmission shaft according to an embodiment of the present invention;

fig. 10c is another schematic cross-sectional view of a transmission shaft according to an embodiment of the present invention;

fig. 10d is another structural schematic diagram of a cross section of a transmission shaft according to the embodiment of the present invention;

FIG. 11 is a front view of the shaft and the sheath according to an embodiment of the present invention;

fig. 12 is a front view of the hinge and the elastic member according to the embodiment of the present invention.

Description of reference numerals:

10-baking tray component, 20-control button, 30-temperature control component, 31-temperature adjusting screw, 32-insulating support, 33-elastic metal sheet, 331-upper contact, 34-double metal sheet, 341-lower contact, 35-heating device, 40-transmission shaft, 40A-rotating shaft, 40B-protective sleeve, 40C-elastic element, 41-groove, 42-end wall, 43-side wall, 44-positioning groove, D-depth of groove, diameter of D-transmission shaft

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various combinations of the specific features of the present invention are not described separately.

In the following description, the term "first \ second \ … …" is referred to merely to distinguish different objects and does not indicate that there is identity or relationship between the objects. It should be understood that the description of the "upper", "lower", "outer" and "inner" directions as related to the orientation in the normal use state, and the "left" and "right" directions indicate the left and right directions indicated in the corresponding schematic drawings, and may or may not be the left and right directions in the normal use state.

It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "coupled", where not otherwise specified, includes both direct and indirect connections.

The utility model provides a transmission shaft and culinary art device can be applied to among cooking devices such as frying and baking machine, cake machine, electric cake clang, electric pressure cooker, electric rice cooker, saucepan to carry out temperature control to cooking device's temperature control subassembly. It should be noted that the application scenario type of the present invention is not limited to the transmission shaft of the present invention.

The following description will be made for the purpose of illustrating the driving shaft of the frying and baking machine. As shown in FIG. 1, the frying and baking machine may include a grill pan assembly 10, a control knob 20, a temperature control 30, and a drive shaft 40. The bakeware assembly 10 includes a heating device disposed in the base accommodating cavity and a bakeware disposed above the heating device, and the heating device can generate heat in the power-on state to heat the bakeware. The temperature control member 30 is electrically connected to the heating device to adjust the temperature, time, etc. of the heating device. One end of the transmission shaft 40 is fixedly connected with the control button 20, and the other end is fixedly connected with the temperature control member 30, and the control button 20 can be arranged outside the baking tray assembly 10, so as to facilitate the operation of a user. The control knob 20 is rotated to drive the transmission shaft 40 to rotate, and the transmission shaft 40 transmits torque to the temperature control member 30, so that the temperature control member 30 acts, and the temperature control member 30 is controlled. For ease of understanding and explanation, the control knob 20, the temperature control member 30 and the transmission shaft 40 will be described in general terms with reference to the schematic diagram of fig. 2.

As shown in fig. 2, the temperature control element 30 may include an elastic metal plate 33 and a bimetal plate 34 which are arranged at intervals and are fixedly connected to the insulating support 32. It should be noted that the bimetal is a composite material composed of two metal materials. The bimetallic strip is also called as a thermal bimetallic strip, and because the thermal expansion coefficients of all component layers are different, when the temperature changes, the deformation of the active layer is larger than that of the passive layer, so that the whole bimetallic strip can bend towards one side of the passive layer, and the curvature of the composite material changes to generate deformation. The lower surface of the elastic metal sheet 33 is provided with an upper contact 331, the upper surface of the bimetal sheet 34 is provided with a lower contact 341, the upper contact 331 is contacted with the lower contact 341, the circuit is connected, the heating device 35 starts to heat, the generated heat can be conducted to the bimetal sheet 34, when the temperature is too high, the bimetal sheet is heated and bent downwards, and the lower contact 341 is driven to move downwards, so that the lower contact 341 is separated from the upper contact 331, the power supply is cut off, and the heating device 35 stops heating. When the temperature drops to the lower limit of the set temperature, the bimetallic strip 34 restores to the original state, the lower contact 341 contacts with the upper contact 331, the circuit is connected, the heating device 35 starts to heat, and the circulation is carried out to play the role of automatically controlling the temperature.

As shown in fig. 2, a temperature adjusting screw 31 is further disposed on the insulating support 32 and is in threaded connection with the insulating support 32, a lower end of the temperature adjusting screw 31 can contact with the elastic metal sheet 33, one end of the transmission shaft 40 is fixedly connected with the control button 20, and the other end of the transmission shaft 40 is fixedly connected with an upper end of the temperature adjusting screw 31. By rotating the control knob 20, the temperature-adjusting screw 31 can be moved up and down to change the amount of deformation of the elastic metal sheet 33, thereby changing the degree of difficulty in contacting the lower contact 341 with the upper contact 331 on the elastic metal sheet 33. For example, when the temperature adjusting screw 31 moves downward, the elastic metal piece 33 can be pushed to move downward and deform, so that the lower contact 341 on the bimetal 34 can more easily contact the upper contact 331 on the elastic metal piece 33. That is, in the process of gradually returning to the original position after the temperature of the bimetal 34 is reduced, the lower contact 341 of the bimetal 34 can contact the upper contact 331 of the elastic metal piece 33 without returning to the completely flat state, and the circuit is turned on again, so that the heating device continues to heat. In this way, the cooking temperature of the frying and baking machine can be always kept within a small variation range, i.e., the temperature-connecting range of the bimetal 34 can be controlled more precisely. The different deformation of elastic metal sheet 33 corresponds the disconnection temperature value of setting of different gears to make cooking device can carry out accurate control to the temperature of a certain gear, make food heat in the temperature range that this gear corresponds.

In the embodiment of the present invention, as shown in fig. 3, the transmission shaft 40 is a flexible body. Specifically, the flexible body has better deformability than the rigid body, the deformation of the rigid body under the action of an external force is very small or negligible, the flexible body can be easily deformed but cannot be damaged under the action of the external force, and the flexible body can be restored to the original state after the external force is cancelled. And due to its good deformability, the transmission shaft 40 is highly adaptable as a component for achieving mechanical motion transmission. For example, the mounting surfaces of two components connecting the opposite ends of the transmission shaft 40 are not on the same plane, and the relative positions of the two components are not adjustable, and the transmission shaft 40 extending linearly cannot be mounted and connected with the two components, so that the transmission shaft 40 can be bent or twisted at a certain angle, the structure and shape of the transmission shaft 40 itself are changed, the opposite ends of the transmission shaft 40 can be respectively correspondingly connected with the two components in a matching manner, thereby mounting and connecting the transmission shaft 40 with the two components, and further realizing the mechanical motion transmission from one component to another component through the transmission shaft 40. For another example, the mounting surfaces of the two members connecting the opposite ends of the transmission shaft 40 are relatively close to each other, the relative positions of the two members are not adjustable, and the length of the transmission shaft 40 is too long, so that the two members cannot be mounted and connected, the transmission shaft can be bent to reduce the linear distance between the opposite ends of the transmission shaft 40 until the distance can be matched with the distance between the mounting surfaces of the two members, so that the transmission shaft 40 can be mounted and connected with the two members, and the transmission of mechanical motion from one member to the other member can be realized through the transmission shaft 40. The flexible body transmission shaft has a wide application range so as to be suitable for products with different structure types, has good universality, does not need to be individually customized so as to be suitable for a product with a certain structure, and can save the design cost.

As shown in fig. 4, the drive shaft 40 extends axially from one end for connection to a driver to the other end for connection to a driven member. Specifically, the driving member may be the control knob 20, and the driven member may be the temperature control member 30. The heating device of the frying and baking machine can be arranged at the bottom of the baking tray assembly 10, and the temperature control part 30 can also be arranged at the bottom of the baking tray assembly 10 and adjacent to the heating device, so that the temperature control part 30 can detect and control the temperature of the heating device. Control knob 20 may be located on the upper portion of grill plate assembly 10 or other location that is convenient for the user to operate or that does not detract from the aesthetics of the grill. One end of the transmission shaft 40 is directly and fixedly connected with the control knob 20, for example, the transmission shaft 40 can be directly connected with a temperature adjusting screw or a temperature adjusting nut of the temperature control member 30, and the other end of the transmission shaft 40 is directly and fixedly connected with the temperature control member 30. The fixed connection mode can be clamping connection, insertion connection, clamping connection, mortise and tenon connection or bonding connection and the like. The axial extension direction of the transmission shaft 40 depends on the positions of the mounting surface of the control knob 20 and the mounting surface of the temperature control element 30, that is, the transmission shaft 40 can flexibly adjust the axial extension direction thereof according to the positions of the control knob 20 and the temperature control element 30. In other words, the flexible transmission shaft 40 has a strong adaptability and can be flexibly adjusted, thereby improving the flexibility of the setting position of the control button 20 of the frying and baking machine. And both ends of the transmission shaft 40 can be directly and correspondingly connected with the temperature control part 30 and the control button 20 respectively, and a switching part or a universal shaft is not required to be arranged between the transmission shaft 40 and the temperature control part 30 and/or between the transmission shaft 40 and the control button 20, so that the cost is effectively saved.

The control button 20 can rotate a preset angle relative to the grill plate assembly 10, and different angle ranges correspond to different temperature gears, for example, the temperature corresponding to each gear gradually increases along the clockwise direction, so that the cooking temperature of the grill can be increased by rotating the control button 20 clockwise, and accordingly, the cooking temperature of the grill can be decreased by rotating the control button 20 counterclockwise. The control button 20 can drive the transmission shaft 40 to rotate in the rotating process, and under the action of torque, the transmission shaft 40 further drives the temperature adjusting screw 31 of the temperature control member 30 to rotate, so that the temperature adjusting screw 31 can move up and down relative to the insulating support 32, and the temperature control of the temperature control member 30 on the heating device is further realized.

As shown in fig. 3, the drive shaft 40 has axially distributed grooves 41. The axial direction refers to a direction in which the length of the drive shaft 40 extends. The grooves 41 are distributed in the axial direction, and the grooves 41 are provided in a range extending from one end to the other end in the axial direction. Specifically, the number of the grooves 41 is arbitrary, and may be one or multiple, the structure and the shape of the grooves 41 are arbitrary, and may be set according to actual needs, and in an exemplary embodiment, the transmission shaft 40 may be an axisymmetric structure, and the axis of symmetry is a central axis. The drive shaft 40 may be of cylindrical construction, for example, it may be of generally cylindrical or prismatic construction. The length-diameter ratio of the transmission shaft 40 can be set according to actual requirements, and it should be noted that the length-diameter ratio refers to the ratio of the length dimension of the transmission shaft to the radial dimension. For example, the aspect ratio may range from 8 to 10.

Specifically, as shown in fig. 5a, the drive shaft 40 may be of a constant diameter configuration from one end to the other; as shown in fig. 5b, the diameter of the connecting portion near the two ends of the transmission shaft 40 may be larger, and the diameter of the main structure in the middle is smaller, so that the strength and rigidity of the connection between the connecting portions at the two ends and the control button 20 and the temperature control element 30 can be effectively improved, and the firmness of the connection can be improved. In an exemplary embodiment, the drive shaft 40 may adopt a configuration as shown in fig. 5b for further explanation.

Specifically, the connection manner between the two ends of the transmission shaft 40 and the control knob 20 and the temperature control element 30 is flexible and various, for example, as shown in fig. 5b, a half-moon-shaped positioning slot 44 is formed at the end of the transmission shaft 40 to prevent the components connected to the transmission shaft 40 from rotating relative to the transmission shaft 40. The positioning groove 44 may also be configured as a T-shaped positioning groove structure as shown in FIG. 5c, or a flower-shaped positioning groove structure as shown in FIG. 5 d. The ends of the drive shaft 40 may also be provided with different detent 44 configurations. Of course, the end of the transmission shaft 40 can be provided with a convex structure as shown in fig. 5e, and the convex structure can be fixedly connected with the control knob 20 and the temperature control member 30, and the convex shape and structure can be any, such as half-moon shape or waist shape. In an exemplary embodiment, both ends of the driving shaft 40 can be further explained by using a structure of a half-moon-shaped positioning groove 44 as shown in fig. 5b, which is reliable and simple in manufacturing process.

As shown in fig. 3, the grooves 41 are distributed in the axial direction as a whole. It is understood that the transmission shaft 40 capable of realizing mechanical transmission has certain rigidity, the higher the rigidity is, the more difficult the transmission shaft 40 is to bend or twist in the process of adapting to the connecting structure, i.e. the more difficult the adapting to the connecting structure is, when the rigidity reaches a certain threshold upper limit, the transmission shaft 40 is a rigid body, i.e. the transmission shaft cannot be bent or twisted without destroying the transmission shaft structure. On the contrary, the smaller the rigidity is, the easier the transmission shaft 40 can be bent or twisted, so that the connection structure can be adapted more easily, that is, the connection and installation of the transmission shaft 40 and the connection structure are simpler and more convenient, when the rigidity reaches a certain threshold, the transmission shaft 40 is soft, after the external force acts on the transmission shaft 40 to deform, because the rigidity is too small, after the external force is cancelled, the restoring force for restoring the transmission shaft 40 to the original state cannot be generated, and obviously, the transmission shaft 40 with the soft structure cannot realize mechanical transmission. That is, the rigidity of the flexible transmission shaft 40 is between the rigidity of a soft body and the rigidity of a rigid body, so that the flexible transmission shaft can be easily deformed under the action of an external force and can be restored to the original shape after the external force is removed. In the process of the self-adaptive connection of the transmission shaft 40, the two opposite ends are respectively and correspondingly fixedly connected with the connection structure, and the moment (bending moment or torque) generated by the deformation (bending or twisting) of the transmission shaft 40 is perpendicular to the axial extension direction of the transmission shaft 40. The grooves 41 are formed in the axial direction of the transmission shaft 40, so that the mass distribution of the transmission shaft 40 in the axial direction can be reduced, the rigidity of the transmission shaft 40 in the axial direction can be effectively reduced, the torque of the rotating shaft 40 can be effectively reduced under the condition that the same deformation quantity occurs, and the transmission shaft 40 is easier to bend or twist.

It should be noted that the difficulty of bending the flexible transmission shaft 40 is opposite to the synchronization and timeliness of the transmission of the flexible transmission shaft 40, that is, the easier the transmission shaft 40 is bent, the worse the synchronization and timeliness of the transmission shaft 40 is. The bending ability of the flexible transmission shaft 40 and the synchronization and timeliness of the transmission need to be balanced as much as possible. On the basis of meeting the transmission effect, the rigidity of the transmission shaft 40 is reduced, so that the transmission shaft 40 is easier to bend and easier to install and match with a connecting structure.

The utility model discloses the transmission shaft is the flexible body, from the one end axial extension that is used for connecting the driving piece to being used for connecting the other end of driven piece to the transmission shaft has the recess that distributes along the axial. The utility model discloses a flexible body transmission shaft is through setting up the recess and adopting the flexible body that can buckle along axial direction to reduce the transmission shaft along axial direction's mass distribution, thereby reduce with the size of axial direction vertically moment, and then make the transmission shaft buckle more easily and/or distort with the driving piece and by the self-adaptation in-process that the driving piece was installed and is connected, effectively reduced the installation degree of difficulty of transmission shaft.

In some embodiments, as shown in fig. 3, the drive shaft 40 includes end walls 42 disposed at one end and the other end and a side wall 43 connecting the two end walls 42. Specifically, the transmission shaft 40 may be a solid cylinder structure, or may be a hollow cylinder. The drive shaft 40 extends in a straight direction without external forces, and has two oppositely disposed end walls 42 and a side wall 43 connecting the two end walls 42. The outer surface of the side wall 43 is provided with a recess 41. In particular, the grooves 41 may be disposed on the outer surface of the sidewall 43 of the transmission shaft 40 and distributed along the length extension direction of the sidewall 43. The structure, shape and number of the grooves 41 are arbitrary, and can be specifically set according to actual needs. The grooves 41 are formed along the side wall 42 of the transmission shaft 40, so that the mass of the side wall 42 can be effectively reduced, the rigidity of the side wall 42 is reduced, the magnitude of moment when the side wall 42 deforms is reduced, and the transmission shaft 40 is easier to bend. The groove is formed in the outer surface of the side wall of the transmission shaft, so that the transmission shaft is easier to bend, and the groove is formed in the outer surface, so that the process is simpler and the processing and forming are easy.

In some embodiments, as shown in fig. 6a to 6c, there are a plurality of grooves 41, the plurality of grooves 41 are spaced apart in the axial direction (the up-down direction shown in fig. 6a to 6 c), and each groove 41 extends at least partially in the circumferential direction. Specifically, as shown in fig. 6a, each groove 41 is only a circumferentially extending portion, and is not formed to surround one turn, forming a row of grooves 41 of the drive shaft 40. The term "open-ended" as used herein means that the groove 41 is open to extend in the circumferential direction in the longitudinal direction. The grooves 41 in adjacent rows are spaced apart so that the drive rod 40 forms a multi-row groove 41 structure. The structure and shape of each groove 41 can be the same to simplify the manufacturing process, and can also be different to satisfy the requirement of differentiation of deformation amount of each part of the transmission shaft 40 in the axial direction. Each row of grooves 41 may have only one groove, or may include a plurality of circumferentially spaced sub-grooves. The adjacent rows of grooves 41 may be maintained in end-to-end alignment or may be staggered out of alignment. As shown in fig. 6b, the upper portion and the lower portion of each groove 41 extend along the circumferential direction, and the extending directions are substantially parallel, and the remaining grooves 41 extend from the tail end of the upper portion to the head end of the lower portion, so as to form a zigzag groove 41 structure, and adjacent zigzag grooves 41 are arranged at intervals. As shown in fig. 6c, each groove 41 extends circumferentially one turn to form a row of circumferentially continuous annular grooves 41, with adjacent rows of annular grooves 41 being spaced apart.

As shown in fig. 6D, the ratio between the diameter D of the transmission shaft 40 and the depth D of the groove 41 is a preset value. Specifically, the preset value belongs to a preset value range, that is, the preset value is not too large or too small because the ratio is too large, which may result in a large rigidity of the transmission shaft 40 and a difficult bending, and the ratio is too small, which may result in a weak rigidity of the transmission shaft 40, making the transmission shaft 40 softer, and although the bending is easy, the transmission effect is affected.

The grooves extending along the circumferential direction are formed in the outer surface of the side wall of the transmission shaft, and the grooves are arranged at intervals along the axial direction, so that the quality of the transmission shaft distributed along the axial direction and the circumferential direction can be effectively reduced, the rigidity of the transmission shaft is reduced, and the transmission shaft is easier to bend.

In other embodiments, as shown in fig. 7a and 7b, the length direction of the groove 41 (up and down direction as shown in fig. 7a and 7 b) extends in the axial direction. Specifically, the number of the grooves 41 is arbitrary, and may be one or more, and for a plurality of grooves 41, the plurality of grooves 41 may be provided at intervals in the circumferential direction. The length extension of the groove 41 is substantially parallel to the axial direction of the drive shaft 40. As shown in fig. 7a, the groove 41 may be axially and continuously extended; as shown in fig. 7b, the grooves 41 may be intermittently arranged in the axial direction. The outer surface of the side wall of the transmission shaft is provided with the groove extending along the axial direction, so that the quality of the transmission shaft distributed along the axial direction can be effectively reduced, the rigidity of the transmission shaft is reduced, and the transmission shaft is easier to bend.

In other embodiments, as shown in FIG. 8, the groove 41 extends helically around the axial direction along the outer surface of the sidewall 43. Specifically, the method comprises the following steps. The groove 41 is a spiral structure, and is formed around the circumferential direction of the transmission shaft 40 and extends in the axial direction. The spiral groove 41 not only can better reduce the bending moment of the transmission shaft 40, but also can effectively reduce the torque of the transmission shaft 40. The spiral groove is formed in the outer surface of the side wall of the transmission shaft, so that the flexibility and the diversity of the periphery of the groove of the transmission shaft are improved.

In other embodiments, the groove 41 may be disposed on the outer surface of the sidewall of the shaft 40. As shown in fig. 9, a groove 41 is provided inside the drive shaft 40 so that the drive shaft 40 is formed as a hollow cylinder. In particular, the transmission shaft 40 has a through hole, i.e. the groove 41, to form a hollow cylindrical structure. The groove 41 may communicate with a positioning groove 44 at the end of the drive shaft 40. The recess 41 may be coaxial with the drive shaft 40 or may be eccentric. The groove 41 may be an axisymmetric structure or a non-axisymmetric structure, and in an exemplary embodiment, the groove 41 is an axisymmetric structure, which facilitates manufacturing. The specific structure of the groove 41 is various, for example, as shown in fig. 10a, the cross-sectional shape of the groove 41 may be a circle, and the cross-section refers to a plane perpendicular to the axial direction; as shown in fig. 10b, the cross-sectional shape of the groove 41 may also be rectangular; as shown in fig. 10c, the cross-sectional shape of the groove 41 may also be polygonal; the cross-sectional shape of the groove 41 may also be flower-shaped, as shown in fig. 10 d. Through the inside recess that forms at the transmission shaft, make the transmission shaft buckle more easily to with the recess setting in inside, avoided offering the recess in outside not pleasing to the eye and the recess problem of accumulating the dirt easily.

In other embodiments, as shown in FIG. 9, the recess 41 is disposed coaxially with the drive shaft 40. Specifically, the groove 41 and the transmission shaft 40 are coaxially arranged, so that the stress of each part of the transmission shaft is more uniform in the bending process, and the service life of the transmission shaft is prolonged.

In some embodiments, as shown in fig. 11, the drive shaft 40 includes a shaft 40A and a protective sleeve 40B. The groove 41 is disposed on the rotating shaft 40A, and the protecting sleeve 40B is sleeved on the rotating shaft 40A and is fixedly connected with the rotating shaft 40A. It should be noted that, the specific structure of the rotating shaft 40A and the arrangement of the groove on the rotating shaft 40A may adopt the specific structure of the transmission shaft and the arrangement of the groove as shown in fig. 3-10 d; that is, the rotating shaft 40A illustrated in fig. 11 can be understood as employing a specific structure of the propeller shaft as in fig. 3 to 10d, and the rotating shaft 40A illustrated in fig. 11 corresponds to the propeller shaft as in fig. 3 to 10 d. Specifically, the transmission shaft 40 may contact or scrape other parts of the frying and baking machine during use, the transmission shaft 40 may be configured as a structure of a rotating shaft 40A and a protective sleeve 40B, and the protective sleeve 40B may be a metal spring or a rubber sleeve or other parts with wear resistance, so as to effectively protect the rotating shaft 40A from being worn and improve the service life of the rotating shaft.

In some embodiments, as shown in fig. 12, the drive shaft 40 includes two shafts 40A and an elastic member 40C. It should be noted that, the specific structure of the two rotating shafts 40A and the arrangement of the grooves on the two rotating shafts 40A may adopt the specific structure of the transmission shaft and the arrangement of the grooves as shown in fig. 3-10 d; that is, the rotating shaft 40A shown in fig. 12 can be understood as adopting a specific structure of the propeller shaft as shown in fig. 3 to 10 d. The shaft 40A shown in fig. 12 corresponds to the drive shaft as in fig. 3-10 d. Two pivot 40A along axial interval setting, two pivot 40A all have recess 41, elastic element 40C along axial setting between two pivot 40A and with two pivot 40A all fixed connection. Specifically, in the rotating process of the flexible body rotating shaft 40, due to its own properties, the rigidity is weak, and there is a certain rotation virtual position, that is, in the process that the control button rotates a certain angle to a corresponding gear at one end of the driving rotating shaft, the angle at which the other end of the rotating shaft connected with the temperature control element can rotate is too small or insufficient, that is, the other end of the rotating shaft does not rotate in place, thereby causing the temperature control of the frying and baking machine to be inaccurate. An elastic element 40C may be disposed between the two rotating shafts 40A, and the elastic element 40C may be compressive elastic, which has better rigidity performance and better bending and twisting capability. Therefore, the transmission shaft is guaranteed to be easy to bend, and meanwhile, the transmission shaft has good rigidity, so that the two ends of the transmission shaft can rotate more accurately, the rotation virtual position is effectively avoided, and the temperature control accuracy of the frying and baking machine is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (18)

1. A transmission shaft for a cooking device, wherein the transmission shaft is a flexible body and extends axially from one end for connecting with a driving part to the other end for connecting with a driven part; wherein the transmission shaft is provided with grooves distributed along the axial direction;

wherein the groove is arranged on the outer surface of the transmission shaft;

and/or the presence of a gas in the gas,

the groove is arranged in the transmission shaft, so that the transmission shaft is formed into a hollow cylinder.

2. The propeller shaft of claim 1, wherein the propeller shaft includes end walls disposed at the one end and the other end and side walls connecting the two end walls; wherein, under the condition that the groove is arranged on the outer surface of the transmission shaft, the groove is arranged on the outer surface of the side wall.

3. The propeller shaft of claim 2 wherein said plurality of grooves are spaced apart in said axial direction; each groove extends at least partially along the circumferential direction.

4. The propeller shaft of claim 3 wherein each of said grooves comprises:

two first grooves extending along the circumferential direction, wherein the two first grooves are distributed at intervals in the axial direction;

and two opposite ends of the second groove are correspondingly connected with one ends of the two first grooves respectively.

5. A propeller shaft as defined in claim 3, wherein each of said grooves is disposed around the outer surface of said side wall in end-to-end relationship.

6. The propeller shaft of claim 1 wherein the ratio of the depth of the groove to the diameter of the propeller shaft is greater than a first predetermined value.

7. A propeller shaft according to claim 2, wherein the length of the groove extends in the axial direction.

8. The propeller shaft of claim 7 wherein said plurality of grooves is circumferentially spaced.

9. A propeller shaft as claimed in claim 7 or claim 8, wherein the recess extends continuously from one end of the propeller shaft in the axial direction to the opposite end of the propeller shaft.

10. A propeller shaft according to claim 7 or claim 8 wherein a plurality of grooves are provided at intervals in the axial direction from one end of the propeller shaft in the axial direction to the other end of the propeller shaft opposite to the one end.

11. A propeller shaft as defined in claim 2, wherein said groove extends helically around said axial direction along an outer surface of said side wall.

12. A propeller shaft as claimed in claim 1, wherein the recess is disposed coaxially with the propeller shaft, with the recess being disposed internally of the propeller shaft.

13. A propeller shaft as defined in claim 10, wherein said recess is provided in plurality.

14. The propeller shaft of claim 1, wherein a cross-section of the groove comprises at least one of the following shapes: circular, rectangular, regular polygonal.

15. The propeller shaft of claim 1, wherein the propeller shaft comprises:

the groove is formed in the rotating shaft;

the two connecting parts are respectively and correspondingly fixedly connected to the two opposite ends of the rotating shaft along the axial direction of the rotating shaft; the connecting part is provided with a positioning groove or a positioning bulge.

16. The propeller shaft of claim 1, wherein the propeller shaft comprises:

the groove is formed in the rotating shaft;

and the protective sleeve is sleeved on the rotating shaft and fixedly connected with the rotating shaft.

17. The driveshaft according to claim 1, wherein the driveshaft includes:

the two rotating shafts are arranged at intervals along the axial direction, and both the two rotating shafts are provided with the grooves;

and the elastic element is arranged between the two rotating shafts in the axial direction and is fixedly connected with the two rotating shafts.

18. A cooking device, comprising:

a drive shaft according to any one of claims 1 to 17;

the control button is the driving piece and is fixedly connected with one end of the transmission shaft;

the temperature control part is the driven part and is fixedly connected with the other end of the transmission shaft; the control button is used for adjusting the temperature control piece.

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