Single-motor double-opening inner swing door

Abstract

A door leaf is driven by a driving assembly to swing through a connecting rod assembly and a swing rod assembly which are connected in sequence and is opened or closed at the same time, and the oppositely-close side edges of the door leaf are provided with a left finger protection rubber strip and a right finger protection rubber strip respectively. An outer sealing lip edge and an inner sealing lip edge with the curled front end are arranged at the two ends of the opposite front sides of the left finger protection rubber strip and the right finger protection rubber strip respectively, the projection length of the outer sealing lip edge of the left finger protection rubber strip is larger than that of the inner sealing lip edge, and the projection length of the outer sealing lip edge of the right finger protection rubber strip is smaller than that of the inner sealing lip edge. The front ends of the outer sealing lips of the left finger protection rubber strip and the right finger protection rubber strip are overlapped, and the front ends of the inner sealing lips abut against each other. According to the utility model, by arranging the asymmetric finger protection rubber strips, when the left door leaf and the right door leaf are opened or closed at the same time, the finger protection rubber strips are in lap joint and abut against each other, so that the sealing performance of the oppositely-opened door leaves is improved, the left door leaf and the right door leaf are sealed without differential motion, and the stability and the reliability of the door leaves are ensured.

Description

Technical Field

[0001] The utility model relates to an automatic door, in particular to a single-motor double-opening inward swing door. Background Art

[0002] In the field of passenger doors for buses, inward swing doors have the advantages of simple structure and low cost, and are widely used. At present, the inward swing door structures on the market can be divided into two types: electric and pneumatic. The locking method is mainly active locking, and additional pneumatic components or electrical components are required to achieve door locking. For example, the invention patent with patent number CN111794623A discloses a pneumatic inward swing door system for buses. In the prior art, this type of system achieves locking through continuous ventilation of the cylinder, and each time the door is opened or closed, the air needs to be turned on and off, which consumes a lot of energy. In addition, pneumatic inward swing doors mostly use cylinder pressure sensors or airbag rubber strips to achieve anti-pinch, and their anti-pinch sensitivity is poor, and the airbag rubber strips are easily broken and fail, and have a short service life.

[0003] Single-motor double-opening inward swing door products mostly use a connecting rod structure to realize the opening and closing movement of the left and right door leaves, but this structure also makes the left and right door leaves move synchronously and interrelated, resulting in difficulties in installation and debugging. For example, the two single-motor inward swing door drive mechanisms disclosed in the utility model patents CN210067792U and CN213359737U both add additional motion compensation devices to the right connecting rod assembly to achieve the differential movement of the left and right door leaves, but due to the installation of such compensation devices, the external force acting on the right door leaf can be transmitted to the compensation device and drive it to move, resulting in obvious looseness of the right door leaf. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a single-motor double-opening inward swing door with improved stability and sealing.

[0005] Technical solution: The utility model describes a single-motor double-opening inward swing door, wherein the door leaf is driven to swing by a driving assembly through a connecting rod assembly and a swing rod assembly connected in sequence, and is opened or closed at the same time, and the sides of the door leaf that are close to each other are respectively provided with a left finger guard strip and a right finger guard strip, and the opposite front ends of the left finger guard strip and the right finger guard strip are respectively provided with an outer sealing lip and an inner sealing lip with a curled front end, the projected length of the outer sealing lip of the left finger guard strip is greater than that of the inner sealing lip, and the projected length of the outer sealing lip of the right finger guard strip is less than that of the inner sealing lip, and when the door leaf is closed, the front ends of the outer sealing lips of the left finger guard strip and the right finger guard strip overlap and overlap, and the front ends of the inner sealing lips abut against each other.

[0006] In the utility model, by providing an asymmetric finger guard rubber strip, when the left and right door leaves are opened or closed at the same time, the finger guard rubber strip overlaps and abuts against each other, thereby improving the sealing of the double-leaf door leaves. There is no need to differentially seal the left and right door leaves, thereby ensuring the stability and reliability of the door leaves.

[0007] Preferably, in order to improve the sealing performance of the finger guard strip on the outer side of the door leaf and facilitate lapping, the outer sealing lip inclines towards the inner sealing lip.

[0008] Preferably, in order to improve the sealing performance of the finger guard strip on the outer side of the door leaf, a connecting part is provided between the inner side of the outer sealing lip of the right finger guard strip and the right finger guard strip body, and a middle mounting hole is provided on the connecting part. The connecting part is used to strengthen the supporting force of the outer sealing lip of the right finger guard strip and improve the sealing performance.

[0009] Preferably, door panel lips for connecting with the door leaf are provided on the back sides of the left finger guard strip and the right finger guard strip.

[0010] Preferably, in order to enable the door leaf to be opened or closed simultaneously, the driving assembly includes a motor, a mounting plate, and a gear assembly. The motor and the gear assembly are respectively arranged above and below the mounting plate. The gear assembly is rotationally connected to the mounting plate axially. Driving shafts are symmetrically arranged at the center of the bottom surface. The driving shafts are hinged to the connecting rod assembly. The motor meshes with the gear assembly to transmit driving force to the connecting rod assembly.

[0011] Preferably, for the convenience of unlocking, the driving assembly further includes a cylinder assembly. The motor is connected to the mounting plate through a motor mounting bracket. The motor mounting bracket can swing relative to the mounting plate. Two ends of the cylinder assembly are respectively hinged to the mounting plate and the motor mounting bracket. The piston rod of the cylinder assembly expands and contracts to push the motor mounting bracket to swing, so that the motor gear meshes with or disengages from the gear assembly.

[0012] Preferably, a slot for defining the rotation amplitude of the motor mounting bracket is provided on the motor mounting bracket, and a rotating shaft cooperating with the slot is provided on the mounting plate.

[0013] Preferably, an unlocking spring is sleeved on the piston rod of the cylinder assembly, and a joint is provided in the rod chamber.

[0014] Preferably, in order to achieve the anti-pinch function, a limiting shaft is eccentrically provided on the upper surface of the gear assembly. The mounting plate is provided with a limiting slot for the limiting shaft to pass through. A switch assembly cooperating with the limiting shaft is provided on the mounting plate at one end of the limiting slot. The motor is a reduction motor, and a Hall sensor is provided in the motor.

[0015] Preferably, taking the center line of the left connecting rod of the connecting rod assembly as the reference line, when the reference line passes through the rotation center of the gear assembly, it is the dead point reference line. The included angle between the connection line of the driving shaft center and the gear assembly center and the dead point reference line is 3° - 30°.

[0016] Advantages: Compared with the prior art, the present utility model has the following advantages: 1. Improve the sealing and stability of the door leaf: In view of the synchronous movement characteristics of the left and right door leaves, the outer sealing lip of the finger guard rubber strip adopts an asymmetric long and short design, thereby achieving the movement effect of synchronous movement and sequential lapping of the door leaves, without the need to set a special differential device, and thus forming a first sealing surface. The inner sealing lip of the rubber strip adopts a symmetric arc design, and forms an inner second sealing surface through mutual extrusion, and can effectively avoid disordered lapping during the extrusion process, effectively improving the aesthetics and sealing performance; 2. Cut-off gas unlocking: The cylinder assembly is connected to the vehicle's normal ventilation source and retracts during normal operation to keep the motor and the gear assembly engaged. In case of emergency, the gas source is disconnected, the cylinder assembly extends, and the motor and the gear assembly are engaged, and manual unlocking can be performed; 3. Improve the deceleration function and reduce energy consumption: The use of a connecting rod structure to achieve near dead points enables equivalent large reduction ratios to be obtained at both the fully closed and fully open positions, while maintaining a smaller value in the middle section, thereby reducing the starting torque of opening and closing the door and the impact of vehicle running vibration on the door pump locking device, effectively reducing the energy consumption of the door system, improving the force on the locking device, with high working efficiency, long service life, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the single-motor double-opening inward-swing door of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the door pump of the present utility model;

[0019] Figure 3 is a schematic structural diagram of the frame of the present utility model;

[0020] Figure 4 is a schematic structural diagram of the drive assembly of the present utility model;

[0021] Figure 5 is a schematic diagram of the upper mounting plate assembly of the present utility model;

[0022] Figure 6 is a schematic structural diagram of the motor mounting bracket of the present utility model;

[0023] Figure 7 is a schematic structural diagram of the motor of the present utility model;

[0024] Figure 8 is a schematic structural diagram of the cylinder assembly of the present utility model;

[0025] Figure 9 is a schematic structural diagram of the gear assembly of the present utility model;

[0026] Figure 10 is a schematic diagram of the dead point reference line, near dead point and included angle of the present utility model;

[0027] Figure 11Schematic diagram of large reduction ratio of the drive assembly of the present utility model;

[0028] Figure 12 Schematic diagram of the abutting state structure of the finger protection rubber strip of the present utility model;

[0029] Figure 13 Schematic diagram of the movement state result of the finger protection rubber strip of the present utility model. Specific implementation mode

[0030] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0031] Example: As Figure 1 shown, the single-motor double-opening inward swing door mainly consists of a door pump 1, a left column assembly 2, a right column assembly 3, an upper swing arm assembly 4, a door shaft fixing seat 5, a left door leaf 6, a right door leaf 7, and a guide wheel assembly 8. Among them, the left and right column assemblies 2 and 3 are arranged on both sides of the vehicle body door frame, and the two ends are respectively rotationally connected to the door pump 1 and the vehicle body through the door shaft fixing seat 5, and can rotate around their own axes. The tops and bottoms of the left and right column assemblies 2 and 3 are respectively connected to the inner sides of the left and right door leaves 6 and 7 through the upper swing arm assembly 4 and the lower swing arm assembly to support the left and right door leaves 6 and 7 and limit their up and down movements, but do not limit the rotational movement. One end of the guide assembly 8 is connected to the left and right door leaves 6 and 7, and the other end is connected to the slideway at the top of the vehicle body.

[0032] The door pump 1 is used to drive the left and right column assemblies 2 and 3 to rotate, so as to open or close the left and right door leaves 6 and 7. As Figure 2 、 Figure 3 shown, the door pump 1 includes a frame 9, a swing rod assembly 10, a left mounting bracket 11, a right mounting bracket 12, a left connecting rod assembly 13, a right connecting rod assembly 14, a drive assembly 15, a slideway 16 and a door controller. The guide assembly 8 is connected to the slideway 16.

[0033] The door pump 1 is fixedly connected to the top of the vehicle frame through the frame 9, the left mounting bracket 11 and the right mounting bracket 12, and both ends of the frame 9 are connected to the tops of the left and right column assemblies 2 and 3 through the door shaft fixing seat 5. The drive assembly 15 is arranged in the middle of the frame 9, and the left connecting rod assembly 13 (right connecting rod assembly 14), the swing rod assembly 10, and the left column assembly 2 (right column assembly 3) are connected in sequence. The left and right connecting rod assemblies 13, 14, and the swing rod assembly 10 transmit the driving force of the drive assembly 15 to the door leaf.

[0034] As Figure 4 shown, the drive assembly 15 mainly consists of an upper mounting plate 17, a motor mounting bracket 18, a motor 19, a cylinder assembly 20, a switch assembly 21, and a gear assembly 22.

[0035] As Figure 5As shown in the figure, the upper mounting plate 17 is fixedly mounted on the frame 9. The upper mounting plate 17 is provided with two mounting surfaces, high and low. Among them, the middle part of the high mounting surface is provided with a shaft hole and a limiting groove, and a fixed shaft 1703 is provided on one side. The two sides of the low mounting surface are respectively provided with a rotating shaft 1702 and a limiting pin shaft 1703.

[0036] As Figure 9 shown in the figure, the gear assembly 22 is the power output component of the motor 19, and is installed between the frame 9 and the upper mounting plate 17. It is connected to the shaft hole of the upper mounting plate 17 and the frame 9 through the main shaft 2201 up and down, and can rotate around its own axis. The bottom surface of the gear assembly 22 is symmetrically provided with two driving shafts 2203 at the center, and the limiting shaft 2202 is eccentrically arranged on the top surface. During assembly, the limiting shaft 2202 is located in the limiting groove of the upper mounting plate 17. The two driving shafts 2203 are respectively connected to the left and right connecting rod assemblies 13 and 14. The motor 19 transmits the driving force to the left and right connecting rod assemblies through the gear assembly 22.

[0037] As Figure 6 , the main body of the motor mounting bracket 18 is L-shaped. One side branch is provided with a mounting hole for sleeving on the rotating shaft 1701, the other side branch is provided with a slot hole 1801, and a driving rod is arranged at the corner. During assembly, the rotating shaft 1702 is located in the slot hole 1801. When the motor mounting bracket 18 swings around the rotating shaft 1701, the movement range is limited by the limiting pin shaft 1702 and the slot hole 1801.

[0038] As Figure 7 , the motor 19 is equipped with a built-in reduction device and is installed on the motor mounting bracket 18, and swings synchronously with the motor mounting bracket 18. During assembly, the motor gear 1901 meshes with the gear assembly 22.

[0039] As Figure 8 , the cylinder assembly 20 is a linear cylinder. A spring 2001 is sleeved on its piston rod, a joint is arranged in the rodless cavity, a ring for cooperating with the driving rod is arranged at the piston head, and a mounting hole for sleeving on the limiting pin shaft 1703 is arranged at the tail of the cylinder barrel. After assembly, the cylinder assembly 20 is used to push the motor mounting bracket 18 to swing around the rotating shaft 1701: when ventilated, the cylinder assembly 20 retracts, pulling the motor mounting seat bracket 18 to rotate counterclockwise. The limiting pin shaft 1702 contacts the left side of the slot hole 1801, and the motor gear 1901 meshes with the gear assembly 22, and the power of the driving assembly 15 is output, and the unlocking spring 2001 is compressed to store energy; when the air supply is cut off, the unlocking spring 2001 resets, the piston rod of the cylinder assembly 20 extends, the cylinder assembly 20 rotates around the fixed shaft 1703, pushing the motor mounting bracket 8 to swing clockwise, and the limiting pin shaft 1702 contacts the right side of the slot hole 1801, and the motor gear 1901 disengages from the gear assembly 22.

[0040] When the motor 19 meshes with the gear assembly 22 and drives it to rotate, the gear assembly 22 transmits the driving force to the swing rod assembly 10 through the left and right connecting rod assemblies 13 and 14, and then the swing rod assembly 10 transmits the driving force to the left and right column assemblies 2 and 3 to make them rotate around their own axes, completing the opening and closing movement of the door leaf.

[0041] Basic working principle:

[0042] Opening the door:

[0043] 1. The cylinder assembly 20 is ventilated and retracted, pulling the motor mounting bracket 18 to rotate around the rotating shaft 1701 until the swing limit pin shaft 1702 contacts the left side of the slot hole 1801 and stops. At this time, the motor gear 1901 meshes with the gear assembly 22;

[0044] 2. When the cylinder assembly 20 is ventilated and retracted, the unlocking compression spring 2001 is compressed and stores energy;

[0045] 3. The motor 19 executes the door opening command, and the motor gear 1901 drives the gear assembly 22 to rotate. Then, the driving force is transmitted to the pushing swing rod assembly 10 through the left and right connecting rod assemblies 13 and 14, making it drive the left and right column assemblies 2 and 3 to rotate around their own axes, thus realizing the door opening movement of the left and right door leaves 6 and 7.

[0046] Closing the door:

[0047] 1. The motor 19 executes the door closing command and drives the gear assembly 22 to rotate in the reverse direction;

[0048] 2. The driving force is transmitted to the pushing swing rod assembly 10 through the left and right connecting rod assemblies 13 and 14, making it drive the left and right column assemblies 2 and 3 to rotate around their own axes, thus realizing the door closing movement of the left and right door leaves 6 and 7;

[0049] 3. When the limit shaft 2202 approaches the closed position stop, it first triggers the switch assembly 21, and then after contacting the limit part, the motor stops rotating and the locking is completed.

[0050] Locking and large reduction ratio: The motor 19 is a reduction motor, and the self-locking characteristic of the motor reducer can be used to achieve full-course locking. Such as Figure 10 、 Figure 11As shown, taking the center line of the left connecting rod as the reference line, when the reference line passes through the rotation center of the gear assembly 22, the reference line is the "dead point reference line". When rotating clockwise, the reference line is above the rotation center of the gear assembly 22, that is, it has not passed the "dead point". A switch assembly 21 and a limit part are arranged at the closed position. The switch assembly 21 is used to identify the in-place situation, and the limit part is used to limit the final stop position of the limit shaft 2202 on the gear assembly 22, so that it does not pass the dead point but is close to the dead point. At this time, the included angle between the connection line of the center of the drive shaft 2203 and the center of the gear assembly 22 and the "dead point reference line" is 3° to 30°. This can make the force arm on the side of the gear assembly 22 of the connecting rod assembly small, while the force arm at the swing rod assembly 10 is large, realizing a large reduction ratio when closed, thereby reducing the starting torque of opening and closing the door and the impact of vehicle running vibration on the self-locking motor, as Figure 11 shown. The large reduction ratio when fully opened is similar to that when fully closed, and will not be described here.

[0051] On the sides where the left and right door leaves 6 and 7 approach each other, left and right finger guard rubber strips 61 and 71 are respectively provided.

[0052] As Figure 12 shown, the left finger guard rubber strip 61 is integrally C-shaped, including a main body 6101, an outer sealing lip 6102, an inner sealing lip 6103, a door panel mounting hole 6104, and a door panel lip 6105.

[0053] The door panel lip 6105 on the back side of the main body 6101 of the left finger guard rubber strip 61 is used to connect with the door leaf. The outer sealing lip 6102 and the inner sealing lip 6103 are respectively arranged at both ends of the front side, and the door panel mounting hole 6104 is arranged in the middle. The front end of the inner sealing lip 6103 is curled back, and the projection length of the outer sealing lip 6102 is greater than that of the inner sealing lip 6103 and is inclined towards the inner sealing lip 6103.

[0054] The right finger guard rubber strip 71 includes a main body 7101, an outer sealing lip 7102, an inner sealing lip 7103, a door panel mounting hole 7104, and a door panel lip 7105; similar to the left finger guard rubber strip 61, the door panel lip 7105 on the back side of the main body 7101 of the right finger guard rubber strip 71 is used to connect with the door leaf. The outer sealing lip 7102 and the inner sealing lip 7103 are respectively arranged at both ends of the front side. The front end of the inner sealing lip 7103 is curled back. The length of the outer sealing lip 7102 is less than that of the inner sealing lip 7103, and the front end is inclined towards the inner sealing lip 7103. A trapezoidal connecting part connecting the outer sealing lip 7102 and the main body 7101 is provided inside the main body 7101 of the right finger guard rubber strip 71, and the door panel mounting hole 7104 is arranged on the connecting part.

[0055] When closing the door, the outer sealing lips 6102 and 7102 of the left and right finger guard rubber strips 61 and 71 overlap and lap in sequence to form a first sealing surface, and the inner sealing lips 6103 and 7103 are symmetrically extruded to form a second sealing surface, forming a double seal.

[0056] The outer sealing lips 6102 and 7102 of the left and right finger guard rubber strips 61 and 71 adopt an asymmetrical design of long and short lengths to meet the movement requirements of synchronous movement and successive lapping of the door leaf, as Figure 13 shown. The inner sealing lips 6103 and 7103 adopt a symmetrical arc design, and achieve inner sealing through mutual extrusion, and can effectively avoid disordered lapping during the extrusion process.

[0057] Both ends of the main bodies 6101 and 7101 extend towards the door panel to form door panel lips 6105 and 7105, which are used to cover the corner areas of the glass, avoiding the exposure of the glass corners and improving the aesthetics of the door leaf main body. The reserved door panel mounting holes 6104 and 7104 can meet the requirements of various anti-pinch functions of the door system.

[0058] Emergency unlocking in the closed door state: In an emergency state, the air cylinder assembly loses air, the unlocking compression spring 2001 releases energy, the air cylinder assembly 20 elongates, and pushes the motor mounting bracket 18 to rotate around the rotating shaft 1701; when the motor mounting bracket 18 rotates, the motor gear 1901 starts to disengage from the gear assembly 22, and stops after the swing limit pin shaft 1702 contacts the right side of the slot hole 1801, realizing emergency unlocking of the closed door. After that, the door can be opened manually.

[0059] Intelligent anti-pinch: A switch assembly 21 is provided on the upper mounting plate 17. When approaching the closed door in place state, the limit shaft 2202 on the gear assembly 22 will trigger the switch assembly 21. The motor 19 is a reduction motor, and a Hall sensor is provided inside. The Hall sensor can detect the number of rotations and rotational speed of the motor and transmit them to the door controller in real time, and then the movement position and state of the door leaf can be determined. When an obstacle is encountered during opening and closing the door, the current and rotational speed of the motor 19 will change, and the door controller will make a determination by comprehensively considering the motor rotational speed, current signal, switch signal and door leaf position, so as to realize the intelligent anti-pinch function.

Claims

1. A single-motor double-opening inward swing door, comprising door leaves arranged symmetrically on both sides, characterized in that: The door leaf is driven to swing by a driving assembly (15) through a connecting rod assembly and a swing rod assembly (10) connected in sequence, and is opened or closed at the same time. The side edges of the door leaf that are close to each other are respectively provided with a left finger guard strip (61) and a right finger guard strip (71). The opposite front ends of the left finger guard strip (61) and the right finger guard strip (71) are respectively provided with an outer sealing lip and an inner sealing lip with a curled front end. The projected length of the outer sealing lip of the left finger guard strip (61) is greater than the inner sealing lip, and the projected length of the outer sealing lip of the right finger guard strip (71) is less than the inner sealing lip. When the door leaf is closed, the front ends of the outer sealing lips of the left finger guard strip and the right finger guard strip overlap and the front ends of the inner sealing lips abut.

2. The single motor double-opening inward swing door according to claim 1, characterized in that: The outer sealing lip is inclined toward the inner sealing lip.

3. The single motor double-opening inward swing door according to claim 1, characterized in that: A connecting portion is provided between the inner side of the outer sealing lip of the right finger protection rubber strip (71) and the body of the right finger protection rubber strip (71), and a middle mounting hole (7104) is provided on the connecting portion.

4. The single motor double-opening inward swing door according to claim 1, characterized in that: The back sides of the left finger protection rubber strip (61) and the right finger protection rubber strip (71) are provided with door panel lips for connecting with the door leaf.

5. The single motor double-opening inward swing door according to claim 1, characterized in that: The driving assembly (15) comprises a motor (19), a mounting plate (17), and a gear assembly (22). The motor (19) and the gear assembly (22) are respectively arranged on the upper and lower sides of the mounting plate (17). The gear assembly (22) is axially connected to the mounting plate (17) for rotation. A driving shaft (2203) is symmetrically arranged on the bottom surface. The driving shaft (2203) is hinged to the connecting rod assembly. The motor (19) and the gear assembly (22) are meshed to transmit driving force to the connecting rod assembly.

6. The single motor double-opening inward swing door according to claim 5, characterized in that: The driving assembly also includes a cylinder assembly (20), the motor (19) is connected to the mounting plate (17) through a motor mounting frame (18), the motor mounting frame (18) can swing relative to the mounting plate (17), the two ends of the cylinder assembly (20) are respectively hinged to the mounting plate (17) and the motor mounting frame (18), the piston rod of the cylinder assembly (20) is extended and retracted to push the motor mounting frame (18) to swing, so that the gear of the motor (19) is engaged or disengaged with the gear assembly (22).

7. The single motor double-opening inward swing door according to claim 6, characterized in that: The motor mounting frame (18) is provided with a slot hole (1801) for limiting the rotation range of the motor mounting frame (18), and the mounting plate (17) is provided with a rotating shaft (1702) that matches the slot hole.

8. The single motor double-opening inward swing door according to claim 6, characterized in that: An unlocking spring (2001) is sleeved on the piston rod of the cylinder assembly (20), and a joint is provided in the rod cavity.

9. The single motor double-opening inward swing door according to claim 5, characterized in that: A limit shaft (2202) is eccentrically provided on the upper surface of the gear assembly (22); the mounting plate (17) is provided with a limit groove for the limit shaft (2202) to pass through; a switch assembly (21) cooperating with the limit shaft (2202) is provided on the mounting plate (17) at one end of the limit groove; the motor (19) is a reduction motor, and a Hall sensor is provided inside the motor.

10. The single motor double-opening inward swing door according to claim 9, characterized in that: When the door leaf is closed, the center line of the left connecting rod of the connecting rod assembly is used as the reference line, and the dead point reference line is when the reference line passes through the rotation center of the gear assembly (22). The angle between the line connecting the center of the drive shaft (2203) and the center of the gear assembly (22) and the dead point reference line is 3° to 30°.

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