Driving motor for electric shutter

Abstract

The invention discloses a driving motor for an electric shutter, and relates to the technical field of motors. The motor comprises a first stator shell, a hollow annular frame and a second stator shell which are coaxially connected in series, double permanent magnet rotors and windings are arranged in the shells, ceramic connecting discs in the centers of the rotors drive air suction paddles to supply air into the shells, exhaust turbines at the two ends discharge heat synchronously, and a through type heat dissipation air channel is formed; the main rotating shaft drives an output support disc through a center gear, a revolution gear and a gear ring in the cone-shaped body, and the output support disc is connected with an output rotating shaft. The adjusting shell and the rolling limiting wheel-spring-hollow screw rod mechanism form a friction adjustable unit, so that stepless speed change and resistance self-protection are realized; the whole body is quickly assembled through the end panel and the tensioning screw rod, so that the coaxiality is ensured and the maintenance is convenient; the motor has the reliability of high power density, efficient heat dissipation, no electronic speed regulation and the flexibility of adjustable speed, and is suitable for driving electric shutters of multiple specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a driving motor for electric blinds. Background Art

[0002] To achieve a slim appearance, existing electric blind drive systems often use a single-rotor permanent magnet motor with a long axial direction and narrow radial direction, directly connected to an external reduction mechanism. Although this type of design can be easily embedded in the narrow cavity above the curtain, it has the following prominent shortcomings: the rotor's rearward length is too large, and the winding and magnetic circuit are concentrated in a small cavity, which limits the heat dissipation path. Frequent starts and stops can quickly accumulate temperature, easily triggering thermal protection or even burning. To compensate for the insufficient output torque of the single rotor, the winding current is often increased or an electronic PWM speed control unit is added, resulting in a complex control circuit, increased fault points, and significant harmonic noise. It is difficult for users to flexibly adjust the lifting and lowering speed according to the size of the curtain and the load. The motor and reducer are usually installed separately, and the heat dissipation holes or fans are often located at the rear of the motor. The air supply path is single and short, and effective airflow cannot be formed deep in the long-axis coil, resulting in low heat dissipation efficiency. Summary of the Invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: a driving motor for an electric blind, comprising a first stator housing and a second stator housing arranged coaxially, a hollow annular frame being fixedly installed between the first stator housing and the second stator housing by overhead clamping, a first permanent magnet rotor and a second permanent magnet rotor being rotatably installed on the inner axis positions of the first stator housing and the second stator housing, the first permanent magnet rotor and the second permanent magnet rotor being coaxially fixed on the main rotating shaft, a rotating shaft end face support disk being fixedly installed at both ends of the first stator housing and the second stator housing, wherein the main rotating shaft is rotatably installed at the axial center position of the two rotating shaft end face support disks; wherein the edge positions of the two rotating shaft end face support disks are provided with equal Air vents are arranged in a circular array, and the air vents allow the air inside and outside the first stator shell and the second stator shell to communicate; the first stator shell and the second stator shell are tightened and fixed together by a tightening screw; exhaust turbines fixedly matched with the main shaft are rotatably installed in the two shaft end support plates, and the two exhaust turbines are used to drive the air inside the first stator shell and the second stator shell to flow outward, and a ceramic connecting plate is fixedly installed between the first permanent magnet rotor and the second permanent magnet rotor. The circumferential surface of the ceramic connecting plate is fixedly installed with suction blades in an equidistant circular array through suction blade brackets, and the suction blades are used to send external air into the first stator shell and the second stator shell through the hollow annular frame.

[0004] Preferably, grooves and protrusions that can be engaged with each other are provided on the contact surfaces of the hollow annular frame and the first stator housing and the second stator housing to ensure that the first stator housing, the hollow annular frame and the second stator housing are coaxial, and the second end panel and the first end panel are fixedly mounted on the first stator housing and the second stator housing respectively. The first end panel and the second end panel are tightened and fixed by four tightening screws, so that the first stator housing, the hollow annular frame and the second stator housing are clamped between the first end panel and the second end panel.

[0005] Preferably, the first end panel and the second end panel are respectively provided with a first exhaust groove and a second exhaust groove, and the first exhaust groove and the second exhaust groove are used to connect the interior of the first stator housing and the second stator housing with the external air; wherein a cone is fixedly mounted on the second end panel, and the side of the cone facing the second exhaust groove is provided with an inclined cone surface to facilitate the circulation of air discharged from the second exhaust groove.

[0006] Preferably, a protective shell is fixedly mounted on the second end panel by means of snap fasteners for easy disassembly, and a plurality of exhaust rectangular holes are provided on the protective shell so that the air discharged from the second exhaust groove passes through the exhaust rectangular holes to the outside of the protective shell.

[0007] Preferably, two concentrically arranged central gears and gear rings are rotatably installed inside the cone, and the central gear and gear ring are meshed and transmitted through three revolving gears. The three revolving gears are all rotatably installed on the output bracket disk, wherein the output bracket disk is coaxially arranged with the central gear and gear ring, and the rotation axis of the revolving gear on the output bracket disk is parallel to and does not intersect with the axis of the central gear.

[0008] Preferably, an adjusting shell is rotatably sleeved on the outer side of the output bracket disc, an output shaft is fixedly mounted on the axis of the output bracket disc, the output shaft passes through the outer side of the adjusting shell, and the output shaft and the adjusting shell are rotatably matched.

[0009] Preferably, a sealing cover plate is fixedly mounted on the conical body, the sealing cover plate is rotatably matched with the adjusting shell, the output shaft is arranged through the sealing cover plate, and the output shaft is rotatably matched with the sealing cover plate; a radial groove is provided in the radial position of the circumferential surface of the conical body, a rolling limiting wheel bracket is slidably mounted on the inner wall of the radial groove, and a hollow screw bracket is also fixedly mounted on the inner wall of the radial groove.

[0010] Preferably, a rolling limiting wheel is rotatably mounted on the side of the rolling limiting wheel bracket facing the adjusting shell, and the rolling limiting wheel is in rolling friction engagement with the circumferential surface of the adjusting shell, wherein the adjusting shell is coaxially fixedly engaged with the gear ring, and the circumferential surfaces of the adjusting shell and the output shaft are flush with each other, and the adjusting shell is in rotational engagement with the cone.

[0011] Preferably, a sliding pin is fixedly installed on the rolling limiting wheel bracket, the axis of the sliding pin is perpendicular to and intersects with the axis of the adjusting shell, the sliding sleeve on the sliding pin is provided with a hollow screw rod, the hollow screw rod is threadedly matched with the hollow screw rod bracket, and the end of the hollow screw rod away from the rolling limiting wheel bracket is provided with a hexagon socket for easy twisting; a spring is provided on the outer surrounding sleeve of the sliding pin, and both ends of the spring are fixedly matched with the hollow screw rod and the rolling limiting wheel bracket.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adopts a "center air intake-two-end exhaust" circulation channel composed of a ceramic connecting disk and equidistant air intake blades, which can continuously supply air to both sides of the stator during the rotation of the rotor, and the hot air is forcibly extracted by the dual exhaust turbine to form a through-type axial air duct; the heat is quickly taken away along the air flow, and the coil temperature rise can be kept within a safe range by continuously raising and lowering the shutters for a long time, which significantly improves the durability and safety factor of the whole machine; (2) The present invention adds a mechanical friction adjustment mechanism composed of a rolling limit wheel-spring-hollow screw, and the clamping force of the rolling limit wheel on the adjustment shell can be adjusted by rotating the hollow screw, thereby changing the orbital speed of the orbiting gear around the axis, and realizing stepless fine-tuning of the output speed; without any complex electronic speed control circuit, the reliability is greatly improved, and electromagnetic noise and electromagnetic compatibility problems are also avoided. (3) The dual permanent magnet rotor of the present invention is designed as an integrated whole with the coaxial main shaft, which doubles the effective pole length while maintaining a thin outer diameter, and significantly improves the output torque; it can directly drive large-size or multi-link blinds without increasing the motor cross-section, and has both high power density and concealed appearance; (4) The hollow annular frame of the present invention adopts concave-convex matching limiters and is clamped into a whole with the first and second stator shells and the end panels at both ends through four tightening screws, which not only ensures the coaxiality of the multi-section shells, but also can be quickly disassembled and repaired; users can complete stator cleaning, lubrication or replacement of parts without disassembling the entire window, and maintenance costs and downtime are significantly reduced; (5) The friction limiter between the rolling limit wheel and the adjustment shell of the present invention can also provide adaptive slip protection when the curtain end encounters resistance, preventing the blinds from getting stuck and burning the motor, thereby improving the safety protection level of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a structural diagram of the second exhaust groove of the present invention.

[0015] Figure 3 It is a structural schematic diagram of the cone of the present invention.

[0016] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0017] Figure 5 This is a structural diagram of the output support disc of the present invention.

[0018] Figure 6 This is a schematic diagram of the permanent magnet rotor structure of the present invention.

[0019] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point B in the middle.

[0020] Figure 8 This is a schematic diagram of the structure of the shaft end support disk of the present invention.

[0021] Reference numerals: 101 - first end panel; 102 - tensioning screw; 103 - second end panel; 104 - protective housing; 105 - exhaust rectangular hole; 106 - first stator housing; 107 - hollow annular frame; 108 - second stator housing; 109 - first exhaust slot; 110 - second exhaust slot; 111 - cone; 112 - sealing cover; 113 - output shaft; 114 - adjustment housing; 115 - rolling limit wheel; 116 - rolling limit wheel bracket ;117-hollow screw;118-sliding pin;119-spring;120-hollow screw bracket;121-output bracket disk;122-center gear;123-revolution gear;124-radial groove;125-main shaft;126-shaft end face support disk;127-exhaust turbine;128-first permanent magnet rotor;129-second permanent magnet rotor;130-intake blade;131-intake blade bracket;132-ceramic connecting disk;133-gear ring. DETAILED DESCRIPTION

[0022] The following is combined with Figures 1-8 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0023] The present invention provides a driving motor for electric blinds, comprising a first stator housing 106 and a second stator housing 108 arranged coaxially, a hollow annular frame 107 being fixedly installed between the first stator housing 106 and the second stator housing 108 by overhead clamping, a first permanent magnet rotor 128 and a second permanent magnet rotor 129 being rotatably installed on the inner axis positions of the first stator housing 106 and the second stator housing 108 respectively, the first permanent magnet rotor 128 and the second permanent magnet rotor 129 being coaxially fixed on the main rotating shaft 125, a rotating shaft end face support disk 126 being fixedly installed at both ends of the first stator housing 106 and the second stator housing 108, wherein the main rotating shaft 125 is rotatably installed at the axial center position of the two rotating shaft end face support disks 126; wherein the edge positions of the two rotating shaft end face support disks 126 are provided with vent holes arranged in an equidistant circular array, for ventilation The hole allows the air inside and outside the first stator housing 106 and the second stator housing 108 to communicate; the first stator housing 106 and the second stator housing 108 are tightened and fixed together by the tightening screw 102; the two shaft end support plates 126 are both rotatably installed with exhaust turbines 127 fixedly matched with the main shaft 125, and the two exhaust turbines 127 are used to drive the air inside the first stator housing 106 and the second stator housing 108 to flow outward, and a ceramic connecting plate 132 is fixedly installed between the first permanent magnet rotor 128 and the second permanent magnet rotor 129. The circumferential surface of the ceramic connecting plate 132 is fixedly installed with suction blades 130 in an equidistant circular array through the suction blade bracket 131. The suction blades 130 are used to send external air into the first stator housing 106 and the second stator housing 108 through the hollow annular frame 107. Grooves and protrusions that can be engaged with each other are provided on the contact surfaces of the hollow annular frame 107 and the first stator housing 106 and the second stator housing 108 to ensure that the first stator housing 106, the hollow annular frame 107 and the second stator housing 108 are coaxial. The second end panel 103 and the first end panel 101 are fixedly mounted on the first stator housing 106 and the second stator housing 108 respectively. The first end panel 101 and the second end panel 103 are tightened and fixed by four tightening screws 102, so that the first stator housing 106, the hollow annular frame 107 and the second stator housing 108 are clamped between the first end panel 101 and the second end panel 103. A first exhaust groove 109 and a second exhaust groove 110 are respectively provided on the first end panel 101 and the second end panel 103. The first exhaust groove 109 and the second exhaust groove 110 are used to connect the interior of the first stator housing 106 and the second stator housing 108 with the external air; wherein a cone 111 is fixedly mounted on the second end panel 103, and the side of the cone 111 facing the second exhaust groove 110 is set with an inclined cone surface to facilitate the circulation of air discharged from the second exhaust groove 110.The second end panel 103 is fixedly mounted with a protective housing 104 by means of a snap fastener for easy disassembly. The protective housing 104 is provided with a plurality of rectangular exhaust holes 105, so that the air exhausted from the second exhaust slot 110 passes through the rectangular exhaust holes 105 to the outside of the protective housing 104. Two concentrically arranged central gears 122 and a gear ring 133 are rotatably mounted inside the cone 111. The central gear 122 and the gear ring 133 are meshed and driven by three revolving gears 123. The three revolving gears 123 are all rotatably mounted on the output support disc 121, wherein the output support disc 121 is coaxially arranged with the central gear 122 and the gear ring 133. The rotation axis of the revolving gear 123 on the output support disc 121 is parallel to and does not intersect with the axis of the central gear 122. An adjustment housing 114 is rotatably sleeved on the outer side of the output support disc 121. An output shaft 113 is fixedly mounted on the axis of the output support disc 121. The output shaft 113 extends to the outer side of the adjustment housing 114 and rotates in conjunction with the adjustment housing 114. A sealing cover plate 112 is fixedly mounted on the cone 111 and rotates in conjunction with the adjustment housing 114. The output shaft 113 extends through the sealing cover plate 112 and rotates in conjunction with the sealing cover plate 112. A radial groove 124 is radially defined on the circumferential surface of the cone 111. A rolling limiting wheel bracket 116 is slidably mounted on the inner wall of the radial groove 124. A hollow screw bracket 120 is also fixedly mounted on the inner wall of the radial groove 124. A rolling limiting wheel bracket 116 is rotatably mounted on the side facing the adjustment housing 114. Rolling limiting wheel 115 engages in rolling friction with the circumferential surface of adjustment housing 114. Adjustment housing 114 is coaxially fixedly engaged with gear ring 133, and the circumferential surfaces of adjustment housing 114 and output shaft 113 are flushly arranged. Adjustment housing 114 engages in rotational engagement with cone 111. A sliding pin 118 is fixedly mounted on rolling limiting wheel bracket 116. The axis of sliding pin 118 is perpendicular to and intersects the axis of adjustment housing 114. A hollow screw 117 is slidably sleeved on sliding pin 118. Hollow screw 117 engages with hollow screw bracket 120 in a threaded transmission. The end of hollow screw 117, away from rolling limiting wheel bracket 116, is provided with a hexagon socket for easy rotation. A spring 119 is sheathed around the outside of sliding pin 118. Both ends of spring 119 engage with hollow screw 117 and rolling limiting wheel bracket 116.

[0024] The working principle of the drive motor for electric Venetian blinds disclosed in the present invention is as follows: the motor is installed as a whole at the top of the Venetian blind and can be used to drive the blind to rise and fall, swing the blades, or perform other functions. The output shaft 113 is fixedly connected to the shaft of the driven component. When in use, the winding coils inside the first stator housing 106 and the second stator housing 108 (the first stator housing 106 and the second stator housing 108 are both provided with winding coils for driving the first permanent magnet rotor 128 and the second permanent magnet rotor 129 to rotate) are driven by electromagnetic force. The rotation of the first permanent magnet rotor 128 and the second permanent magnet rotor 129 drives the main shaft 125 and the ceramic connection plate 132 fixed thereto. The air intake blades 130 and the two exhaust turbines 127 rotate to discharge air from the first and second stator housings 106, 108. The rotation of the air intake blades 130 draws external air through the hollow annular frame 107 and into the first and second stator housings 106, 108, allowing air to flow through the first and second stator housings 106, 108. This effectively solves the overheating problem caused by prolonged operation of the coil windings on the first and second stator housings 106, 108. Due to size limitations, conventional motors at the top of electric Venetian blinds are often designed to be longer in the axial direction and smaller in the circumference, while ensuring power. This allows for better integration into the top drive housing of the blinds without affecting their appearance. However, this results in an excessively long rearward length of the motor rotor, which facilitates internal heat accumulation. After repeated operation of the blinds, the motor can easily overheat. Air is taken in from the middle ceramic connecting plate 132 and then directed to both ends, which can effectively solve the heat dissipation problem of the long-axis motor.

[0025] The rotation of the main shaft 125 will drive the central gear 122 inside the cone 111 to rotate. The rotation of the central gear 122 will drive the gear ring 133 to rotate through the revolving gear 123. The rotation of the gear ring 133 will drive the revolving gear 123 to rotate around the axis of the output shaft 113 through the regulating shell 114 in the restricted state. Then all the revolving gears 123 will drive the output bracket disk 121 to rotate accordingly. The rotation of the output bracket disk 121 will drive the output shaft 113 to rotate, thereby driving the blinds to perform specified actions. In the initial default state, the hollow screw 117 rotates to the position closest to the adjustment housing 114, that is, the spring 119 is in the extreme compression state. At this time, the elastic force of the spring 119 will press on the rolling limit wheel 115 through the rolling limit wheel bracket 116, which will cause the friction between the rolling limit wheel 115 and the adjustment housing 114 to be the largest. At this time, the rotation of the adjustment housing 114 is most restricted. At this time, the rotation speed of the revolving gear 123 around the axis of the output shaft 113 is the largest (the speeds of the first permanent magnet rotor 128 and the second permanent magnet rotor 129 are not adjustable). Then, when the hollow screw 117 is rotated to When moving away from the adjustment housing 114, the compression of the spring 119 decreases, thereby reducing the rolling friction between the rolling restriction wheel 115 and the adjustment housing 114 and reducing the degree of rotational restriction on the adjustment housing 114. At this time, the reaction force of the revolving gear 123 on the gear ring 133 caused by the revolution of the revolving gear 123 around the output shaft 113 is more easily released to the adjustment housing 114 (the gear ring 133 and the adjustment housing 114 are fixed). As a result, the speed of the revolving gear 123 rotating around the axis of the output shaft 113 decreases. In other words, the speed of the Venetian blind can be adjusted by rotating the hollow screw 117. This can be achieved without a complex electronic control system, reducing the overall complexity and improving the stability of the motor.

Claims

1. A drive motor for an electric blind, characterized by: The invention comprises two coaxially arranged first stator shells (106) and second stator shells (108), a hollow annular frame (107) is fixedly installed between the first stator shell (106) and the second stator shell (108), a first permanent magnet rotor (128) and a second permanent magnet rotor (129) are respectively rotatably installed on the inner axis positions of the first stator shell (106) and the second stator shell (108), the first permanent magnet rotor (128) and the second permanent magnet rotor (129) are coaxially fixed on the main rotating shaft (125), and the first stator shell (106) and Both ends of the second stator housing (108) are fixedly mounted with shaft end face support disks (126), wherein the main shaft (125) is rotatably mounted at the axis center position of the two shaft end face support disks (126); wherein the edges of the two shaft end face support disks (126) are provided with vent holes arranged in an equidistant circular array, and the vent holes allow the air inside and outside of the first stator housing (106) and the second stator housing (108) to communicate; the first stator housing (106) and the second stator housing (108) are tightened and fixed together by a tightening screw (102); An exhaust turbine (127) fixedly matched with the main rotating shaft (125) is rotatably mounted in each of the two rotating shaft end surface support plates (126). The two exhaust turbines (127) are used to drive the air inside the first stator housing (106) and the second stator housing (108) to flow outward.

2. The driving motor for electric blinds according to claim 1, characterized in that: A ceramic connection disk (132) is fixedly mounted between the first permanent magnet rotor (128) and the second permanent magnet rotor (129), and suction blades (130) are fixedly mounted on the circumferential surface of the ceramic connection disk (132) in an equidistant circular array via suction blade brackets (131), and the suction blades (130) are used to send external air into the first stator housing (106) and the second stator housing (108) through the hollow annular frame (107); Grooves and protrusions capable of being engaged with each other are provided on the contact surfaces of the hollow annular frame (107) and the first stator housing (106) and the second stator housing (108), thereby ensuring that the first stator housing (106), the hollow annular frame (107) and the second stator housing (108) are coaxial. The first stator housing (106) and the second stator housing (108) are respectively fixedly sleeved with a second end panel (103) and a first end panel (101). The first end panel (101) and the second end panel (103) are tightened and fixed by four tightening screws (102), so that the first stator housing (106), the hollow annular frame (107) and the second stator housing (108) are clamped between the first end panel (101) and the second end panel (103).

3. The driving motor for electric blinds according to claim 2, characterized in that: A first exhaust groove (109) and a second exhaust groove (110) are respectively provided on the first end panel (101) and the second end panel (103), and the first exhaust groove (109) and the second exhaust groove (110) are used to connect the interior of the first stator housing (106) and the second stator housing (108) with the external air; wherein a cone (111) is fixedly mounted on the second end panel (103), and a side of the cone (111) facing the second exhaust groove (110) is provided with an inclined cone surface, so as to facilitate the circulation of air discharged from the second exhaust groove (110).

4. The driving motor for electric blinds according to claim 3, characterized in that: A protective shell (104) is fixedly mounted on the second end panel (103) by means of a snap fastener for easy disassembly. The protective shell (104) is provided with a plurality of exhaust rectangular holes (105), so that air exhausted from the second exhaust slot (110) passes through the exhaust rectangular holes (105) to the outside of the protective shell (104).

5. The driving motor for electric blinds according to claim 4, characterized in that: Two concentrically arranged central gears (122) and a gear ring (133) are rotatably mounted inside the cone (111). The central gear (122) and the gear ring (133) are meshed and driven by three revolving gears (123). The three revolving gears (123) are all rotatably mounted on an output support disc (121). The output support disc (121) is coaxially arranged with the central gear (122) and the gear ring (133). The rotation axis of the revolving gear (123) on the output support disc (121) is parallel to and does not intersect with the axis of the central gear (122).

6. The driving motor for electric blinds according to claim 5, characterized in that: An adjusting shell (114) is provided on the outer rotation sleeve of the output bracket disc (121), an output rotating shaft (113) is fixedly installed at the axis position of the output bracket disc (121), the output rotating shaft (113) penetrates the outer side of the adjusting shell (114), and the output rotating shaft (113) and the adjusting shell (114) are rotationally matched.

7. The driving motor for electric blinds according to claim 6, characterized in that: A sealing cover plate (112) is fixedly mounted on the conical body (111), the sealing cover plate (112) and the regulating shell (114) are rotatably matched, the output shaft (113) is arranged to pass through the sealing cover plate (112), and the output shaft (113) and the sealing cover plate (112) are rotatably matched; a radial groove (124) is provided at a radial position on the circumferential surface of the conical body (111), a rolling limiting wheel bracket (116) is slidably mounted on the inner wall of the radial groove (124), and a hollow screw bracket (120) is also fixedly mounted on the inner wall of the radial groove (124).

8. The driving motor for electric blinds according to claim 7, characterized in that: A rolling limiting wheel bracket (116) is rotatably mounted on a side of the adjusting housing (114), and the rolling limiting wheel (115) is in rolling friction engagement with the circumferential surface of the adjusting housing (114). The adjusting housing (114) is coaxially fixedly engaged with the gear ring (133), and the circumferential surfaces of the adjusting housing (114) and the output shaft (113) are flush with each other. The adjusting housing (114) is in rotational engagement with the conical body (111).

9. The driving motor for electric blinds according to claim 8, characterized in that: A sliding pin (118) is fixedly mounted on the rolling limiting wheel bracket (116), the axis of the sliding pin (118) is perpendicular to and intersects the axis of the adjustment shell (114), a sliding sleeve on the sliding pin (118) is provided with a hollow screw rod (117), the hollow screw rod (117) is threadedly matched with the hollow screw rod bracket (120), and an inner hexagonal socket for easy twisting is provided at one end of the hollow screw rod (117) away from the rolling limiting wheel bracket (116); a spring (119) is provided around the outer side of the sliding pin (118), and both ends of the spring (119) are fixedly matched with the hollow screw rod (117) and the rolling limiting wheel bracket (116).

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