A door latch mechanism for a manned centrifuge

Abstract

This invention discloses a door latching mechanism for a manned centrifuge, comprising a No. 1 latch mechanism, two pull rods, a No. 2 latch mechanism, and a handle mechanism. Both the No. 1 and No. 2 latch mechanisms include a first hinge seat, a first connecting rod, a second connecting rod, a latch, a latch seat, and a linear proximity sensor. The handle mechanism includes an inner handle, a spindle, a handle mounting seat, a rocker arm, and an outer handle. This invention employs a double-over-dead-point self-locking design for both the latch and handle mechanisms, ensuring that even under overload or vibration conditions, external forces will not easily open the latch, and unlocking is convenient and quick. A linear proximity sensor is used to directly monitor the latch status, ensuring a reliable and accurate locking signal. A parallel design with two latches is employed, and the status of each latch is monitored to ensure secure locking.

Description

Technical Field

[0001] This invention relates to the field of manned centrifuge technology, and more particularly to a door latch mechanism for a manned centrifuge. Background Technology

[0002] The sustained acceleration generated by the maneuvering of modern high-performance fighter jets can easily cause pilots to experience G-induced loss of consciousness (G-LOC), reducing combat capability and threatening flight safety. Using manned centrifuges for flight simulation training allows pilots to practice and master anti-G maneuvering skills, experience the physiological effects of acceleration loads, and enhance their awareness of high-G protection. It is the safest and most economical way to improve pilots' G-endurance, and this training method is unaffected by weather conditions, allowing for all-weather operation. It has been widely adopted by various countries and has achieved excellent training results.

[0003] The cockpit, as the core component of the manned centrifuge, provides pilots with simulated flight and G-force environments. During flight training, the cockpit is constantly under G-force conditions; therefore, the cockpit door latch must always be securely locked, with its status monitorable and signals reliable to ensure pilot safety. Furthermore, considering that fainting sometimes occurs among subjects during endurance training using the manned centrifuge, the latch mechanism must also be able to unlock quickly.

[0004] The disadvantages of the latching mechanism in the prior art are:

[0005] (1) Traditional latching mechanisms or those without self-locking function, such as padlocks, are not suitable for quick unlocking in emergency rescue, or the self-locking mechanism is not safe and reliable enough to be used in overload environments.

[0006] (2) Traditional latching mechanisms are not designed with a pin locking status monitoring function, or only monitor the opening and closing status of the door, which is not reliable enough, and there are cases where the door is closed but not locked.

[0007] (3) Traditional latching mechanisms are generally not designed with an adjustment mechanism, and installation deviations may lead to a decrease in the locking effect.

[0008] (4) Traditional latching mechanisms generally only have one pin mechanism, which is not reliable enough.

[0009] Causes:

[0010] (1) Traditional latching mechanisms may not take into account the need for quick unlocking in emergency rescue, so a padlock may be used to ensure the locked state, or the use requirements under overload conditions may not be considered, so a latch lock may be used to ensure quick unlocking. However, neither padlocks nor latch locks can guarantee that the hatch can be quickly unlocked in an emergency and can be used safely and reliably under overload conditions.

[0011] (2) In daily life and industrial production, where the security requirements of the gate are not very high, the locking status of the gate is generally not monitored. In situations where the security status of the gate is strictly required, the opening and closing status of the gate is often monitored, such as by using a proximity switch. This can lead to situations where the gate is closed but not locked, and the sensor will give an incorrect signal.

[0012] (3) Traditional latching mechanisms are not designed with an installation adjustment mechanism. Due to manufacturing errors in the latching mechanism or mounting plate, the installation accuracy will be affected, resulting in the latch not being inserted tightly or not locking securely.

[0013] (4) Traditional latching mechanisms usually only have one bolt mechanism, such as common padlocks, latch locks, and snap locks, which means that a failure of one bolt mechanism will lead to the failure of the latching mechanism.

[0014] Therefore, it is necessary to develop a door latching mechanism for manned centrifuges to solve the above problems. Summary of the Invention

[0015] The purpose of this invention is to design a door latch mechanism for a manned centrifuge in order to solve the above-mentioned problems.

[0016] The present invention achieves the above objectives through the following technical solutions:

[0017] A door latching mechanism for a manned centrifuge includes:

[0018] No. 1 latch mechanism;

[0019] Two pull rods;

[0020] The No. 2 pin mechanism has the same structure as the No. 1 pin mechanism, including a first hinge seat, a first connecting rod, a second connecting rod, a pin, a pin seat, and a linear proximity sensor. The first end of the first hinge seat is fixedly installed. The first end of the first connecting rod is hinged to the second end of the first hinge seat. The second end of the first connecting rod is hinged to the first end of a pull rod and the first end of the second connecting rod. The second end of the second connecting rod is hinged to the first end of the pin. The pin seat is fixedly installed and has a socket. The pin is inserted from the first end of the socket to form a locking engagement with the pin seat. The linear proximity sensor is installed near the second end of the socket.

[0021] Handle Mechanism; The handle mechanism is located between the No. 1 and No. 2 pin mechanisms. The handle mechanism includes an inner handle, a spindle, a handle mounting base, a rocker arm, and an outer handle. The inner and outer handles are arranged parallel to each other. The spindle is rotatably mounted on the handle mounting base, with the bottom of the handle mounting base fixed in place. The rocker arm is triangular in shape. One end of the inner handle, the first end of the rocker arm, and one end of the outer handle are respectively mounted on the first, middle, and second ends of the spindle. Two limiting blocks are radially mounted on the side wall of the spindle, and corresponding stops are provided on the handle mounting base. The limiting blocks and stops are axially aligned on the spindle. At the specified position, the second and third ends of the rocker arm are hinged to the second ends of the two pull rods, respectively. When the No. 1 and No. 2 pin mechanisms are locked, the first linkage structure consisting of the first hinge seat, the first connecting rod, the second connecting rod, the pin, and the pull rod, as well as the second linkage structure consisting of the pull rod and the handle mechanism, are all at dead points. At this time, a limit block contacts the first end of the stop block. When the No. 1 and No. 2 pin mechanisms are unlocked, the rocker arm is rotated, and both the first and second linkage structures pass through the dead points. Finally, another limit block contacts the second end of the stop block, and the No. 1 and No. 2 pin mechanisms are unlocked.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. It adopts a double dead-point self-locking design with both a pin mechanism and a handle mechanism to ensure that it is not easily opened by external force even in overload or vibration environments, and that unlocking is convenient and quick;

[0024] 2. A linear proximity sensor is used to directly monitor the status of the latch, ensuring that the locking status signal is authentic and reliable;

[0025] 3. A dual-pin parallel design is adopted, and the status of each pin is monitored to ensure safe locking. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this application;

[0027] Figure 2 This is a partial structural diagram of the handle mechanism in this application. Figure 1 ;

[0028] Figure 3 This is a partial structural diagram of the handle mechanism in this application. Figure 2 ;

[0029] Figure 4 This is a partial structural diagram of the pin mechanism in this application;

[0030] Figure 5 This is a schematic diagram of the tie rod in this application.

[0031] Legend:

[0032] 1—Pin mechanism No. 1; 2—Pull rod No. 1; 3—Handle mechanism; 4—Pull rod No. 2; 5—Pin mechanism No. 2; 6—Inner handle; 7—Mandrel; 8—Handle mounting seat; 81—Stop; 9—Limit block; 10—Outer handle; 11—Rock arm; 111—First connecting hole; 112—Second connecting hole; 113—Third connecting hole; 12—Linear proximity sensor; 13—Sensor mounting seat; 14—Pin seat; 15—Pin; 16—Bushing; 17—Pin mounting seat; 18—Pin adjusting rod; 19—Pin locking nut; 20—Connecting joint No. 1; 21—Locking nut for joint No. 1; 22—Hollow connecting rod; 23—Locking nut for joint No. 2; 24—Connecting joint No. 2; 25—First hinge seat; 26—First connecting rod; 27—Second connecting rod; 28—Second hinge seat; 29—Spring rod. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0040] like Figure 1-4 As shown, a door latching mechanism for a manned centrifuge includes:

[0041] No. 1 latch mechanism 1;

[0042] Pull rod #1 (2), pull rod #2 (4);

[0043] The No. 2 pin mechanism 5; the No. 1 pin mechanism 1 and the No. 2 pin mechanism 5 have the same structure, both including a first hinge seat 25, a first connecting rod 26, a second connecting rod 27, a pin 15, a pin seat 14, and a linear proximity sensor 12; the first end of the first hinge seat 25 is fixedly installed, the first end of the first connecting rod 26 is hinged to the second end of the first hinge seat 25, the second end of the first connecting rod 26 is respectively hinged to the first end of a pull rod (pull rod 2 or pull rod 4) and the first end of the second connecting rod 27, the second end of the second connecting rod 27 is hinged to the first end of the pin 15, the pin seat 14 is fixedly set, the pin seat 14 is provided with a socket, the pin 15 is used to be inserted from the first end of the socket to form a locking engagement with the pin seat 14, and the linear proximity sensor 12 is installed near the second end of the socket.

[0044] Handle mechanism 3; Handle mechanism 3 is located between pin mechanism 1 (1) and pin mechanism 5 (2). Handle mechanism 3 includes an inner handle 6, a spindle 7, a handle mounting base 8, a rocker arm 11, and an outer handle 10. The inner handle 6 and the outer handle 10 are arranged parallel to each other. The spindle 7 is rotatably mounted on the handle mounting base 8, and the bottom of the handle mounting base 8 is fixedly mounted. The rocker arm 11 is triangular in shape, and one end of the inner handle 6, the first end of the rocker arm 11, and one end of the outer handle 10 are respectively mounted on the first end of the spindle 7. On the middle and second ends, two limiting blocks 9 are radially installed on the side wall of the spindle 7, and correspondingly, a stop block 81 is provided on the handle mounting seat 8. The limiting blocks 9 and the stop block 81 are positioned at the same length in the axial direction of the spindle 7. The second and third ends of the rocker arm 11 are respectively hinged to the second ends of two tie rods (tilt rod 2, tie rod 4). (In essence, a first connecting hole 111 is provided on the second end of the rocker arm 11; a third connecting hole 113 is provided on the third end, and the hinge is respectively...) (It functions with the first connecting hole 111 and the third connecting hole 113); when the first pin mechanism 1 and the second pin mechanism 5 are in the locked state (the pin 15 is inserted into the insertion hole a certain distance), the first hinge seat 25, the first connecting rod 26, the second connecting rod 27, the pin 15, and the pull rod form the first connecting rod 26 structure (the pull rod 2 and the pull rod 4 form two sets of first connecting rod 26 structures with the two sets of first hinge seats 25, first connecting rod 26, second connecting rod 27, and pin 15 respectively), and the pull rod and the hand The second link 27 structure composed of the handle mechanism 3 (the first pull rod 2 and the second pull rod 4 respectively form two sets of second link 27 structures with the handle mechanism 3) are both at the dead point. At this time, a limit block 9 is in contact with the first end of the stop block 81. When the first pin mechanism 1 and the second pin mechanism 5 are unlocked, the rocker arm 11 is rotated, and the first link 26 structure and the second link 27 structure both pass the dead point. Finally, the other limit block 9 is in contact with the second end of the stop block 81, and the first pin mechanism 1 and the second pin mechanism 5 are unlocked.

[0045] In some embodiments, such as Figure 1-3 As shown, the handle mechanism 3 also includes a second hinge seat 28 and a spring rod 29. The second hinge seat 28 is positioned above the rocker arm 11, with its top fixed. The upper end of the spring rod 29 is hinged to the second hinge seat 28. A connecting part is provided between the second and third ends of the rocker arm 11, and the lower end of the spring rod 29 is hinged to the connecting part (in essence, a second connecting hole 112 is provided between the first connecting hole 111 and the third connecting hole 113, and the hinge here interacts with the second connecting hole 112). The spring rod 29 is always in a compressed state. The purpose of the spring rod 29 is to press the rocker arm 11 firmly in both the unlocked and unlocked states of the hatch door latch mechanism by the thrust of the spring rod 29, thus stabilizing the rocker arm 11 and ensuring the stability of the hatch door latch mechanism in both unlocked and unlocked states.

[0046] In some embodiments, such as Figure 4 As shown, both the No. 1 pin mechanism 1 and the No. 2 pin mechanism 5 also include a pin mounting seat 17. The pin mounting seat 17 and the pin seat 14 are spaced apart. The pin mounting seat 17 is fixed in position. The pin mounting seat 17 is provided with a mounting hole. The mounting hole is coaxial with the insertion hole. The pin 15 is guided and moved to be placed in the mounting hole.

[0047] In some embodiments, such as Figure 4 As shown, both pin mechanism 1 (No. 1) and pin mechanism 5 (No. 2) also include a bushing 16. The bushing 16 is formed into a cylindrical ring structure and is installed in the mounting hole. The pin 15 is guided and moved within the bushing 16. The bushing 16 is designed between the pin 15 and the pin mounting seat 17, which can effectively reduce the wear of the pin 15. Future maintenance will mainly be carried out by replacing the bushing 16, which ensures that the locking effect is not reduced and facilitates subsequent maintenance.

[0048] In some embodiments, such as Figure 4 As shown, both the No. 1 pin mechanism 1 and the No. 2 pin mechanism 5 also include a sensor mounting base 13. The sensor mounting base 13 is installed below the pin base 14, and the linear proximity sensor 12 is fixedly installed on the sensor mounting base 13.

[0049] In some embodiments, such as Figure 4 As shown, both the No. 1 pin mechanism 1 and the No. 2 pin mechanism 5 also include a pin adjusting rod 18 and a pin locking nut 19. One end of the pin 15 is first provided with an internal threaded hole, and the outer side wall of the pin adjusting rod is provided with an external thread. The pin locking nut 19 and the pin 15 are both threadedly engaged with the pin adjusting rod 18. One end face of the pin locking nut 19 is in contact with the end face of the pin 15. The end of the pin adjusting rod 18 away from the pin 15 is hinged to the second end of the second connecting rod 27.

[0050] In some embodiments, such as Figure 5 As shown, the tie rod includes a No. 1 connecting joint 20, a No. 1 connecting joint locking nut 21, a hollow connecting rod 22, a No. 2 connecting joint locking nut 23, and a No. 2 connecting joint 24. The hollow connecting rod 22 has an axially threaded through hole. Both the outer walls of the No. 1 connecting joint 20 and the No. 2 connecting joint 24 have external threads. The first end of the threaded through hole of the No. 1 connecting joint locking nut 21 and the hollow connecting rod 22 is threaded into the No. 1 connecting joint 20. The second end of the threaded through hole of the No. 2 connecting joint locking nut 23 and the hollow connecting rod 22 is threaded into the No. 2 connecting joint 24. One end face of the No. 1 connecting joint locking nut 21 contacts the first end face of the hollow connecting rod 22, and one end face of the No. 2 connecting nut 23 contacts the second end face of the hollow connecting rod 22.

[0051] When the manned centrifuge cabin door latch mechanism is in the locked state, the pin 15 is in place, and then the limit block 9 on the handle mechanism 3 contacts the handle mounting seat 8, preventing the pin 15 from moving forward further, thus ensuring a tight lock. Figure 2 and 3 As shown.

[0052] according to Figure 2 and Figure 3 In the indicated direction, rotate the inner handle 6 or outer handle 10 of the handle mechanism 3. Unlocking occurs when the other limiting block 9 contacts the other end of the stop block 81 of the handle mounting seat 8. During unlocking, both pin mechanisms 1 and 5 must pass the dead point, and the linkage mechanism formed by the pull rod 2 and handle mechanism 3 must also pass the dead point. This constitutes a double-dead-point self-locking design for both pin mechanisms and handle mechanism 3. This design ensures that pin 15 is not easily opened by external disturbances, making it suitable for use in overload environments and ensuring pilot training safety in the cockpit. Furthermore, as can be seen from the unlocking process, unlocking only requires rotating the inner handle 6 or outer handle 10 of the handle mechanism 3, without any extra actions, making it convenient and quick. The two limiting blocks 9 are symmetrically distributed relative to the axis of the spindle 7. The two limiting blocks 9 are set on the same axis. When one limiting block 9 contacts one end of the stop block 81 (blocks), the other limiting block 9 and the other end of the stop block 81 form a 60° angle relative to the axis of the spindle 7.

[0053] In this application, the linear proximity sensor, sensor mounting base, and latch are placed as one set on the movable or fixed part of the door, while the remaining components are placed as another set on the opposite fixed or movable part of the door. The inner handle and outer handle are placed on the inner and outer sides of the cabin, respectively.

[0054] This application monitors the state of the latch 15 using a linear proximity sensor 12 and outputs a switching signal. Once the latch 15 has entered the latch seat 14 a certain distance, it is determined to be locked. This application can solve the risk of false alarms in traditional solutions and ensure the safety of pilots training in the manned centrifuge cockpit. Furthermore, this application sets monitoring points for both latch mechanism 1 (No. 1) and latch mechanism 5 (No. 2) as a safety redundancy design consideration.

[0055] The pin 15 is designed with a length adjustment structure. When adjusting, if it needs to be lengthened, the pin adjusting rod 18 should be unscrewed and then the pin locking nut 19 should be tightened. If it needs to be shortened, the pin locking nut 19 should be unscrewed first, then the pin adjusting rod 18 should be screwed into the internal thread hole of the pin 15, and then the pin locking nut 19 should be tightened. The pin locking nut 19 is used to lock the position of the pin adjusting rod 18 and the pin 15.

[0056] The length adjustment of pull rods 1 and 2 works on the same principle as the length adjustment of pin 15. When adjusting, if a longer adjustment is needed, unscrew connector 1 (20) and connector 24 (24), then tighten the locking nut 21 (21) and locking nut 23 (23). If a shorter adjustment is needed, unscrew the locking nut 21 (21) and locking nut 23 (23), then screw connector 1 (20) and connector 24 (24) into the threaded hole of the hollow connecting rod 22, then tighten the locking nut 21 (21) and locking nut 23 (23). The locking nut 21 (21) and locking nut 23 (23) are used to lock the position of connector 1 (20) and connector 24 (24) with the hollow connecting rod 22. By adjusting the length of the pull rods and pin 15, the connection requirements of the first connecting rod 26 and the second connecting rod 27 can be ensured.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A door latching mechanism for a manned centrifuge, characterized in that, include: No. 1 latch mechanism; Two pull rods; The No. 2 pin mechanism has the same structure as the No. 1 pin mechanism, including a first hinge seat, a first connecting rod, a second connecting rod, a pin, a pin seat, and a linear proximity sensor. The first end of the first hinge seat is fixedly installed. The first end of the first connecting rod is hinged to the second end of the first hinge seat. The second end of the first connecting rod is hinged to the first end of a pull rod and the first end of the second connecting rod. The second end of the second connecting rod is hinged to the first end of the pin. The pin seat is fixedly set and has a socket. The pin is inserted from the first end of the socket to form a locking engagement with the pin seat. The linear proximity sensor is installed near the second end of the socket. Handle Mechanism; The handle mechanism is located between the No. 1 and No. 2 pin mechanisms. The handle mechanism includes an inner handle, a spindle, a handle mounting base, a rocker arm, and an outer handle. The inner and outer handles are arranged parallel to each other. The spindle is rotatably mounted on the handle mounting base, with the bottom of the handle mounting base fixed in place. The rocker arm is triangular in shape. One end of the inner handle, the first end of the rocker arm, and one end of the outer handle are respectively mounted on the first, middle, and second ends of the spindle. Two limiting blocks are radially mounted on the side wall of the spindle, and corresponding stops are provided on the handle mounting base. The limiting blocks and stops are axially aligned on the spindle. At the specified position, the second and third ends of the rocker arm are hinged to the second ends of the two pull rods, respectively. When the No. 1 and No. 2 pin mechanisms are locked, the first linkage structure consisting of the first hinge seat, the first connecting rod, the second connecting rod, the pin, and the pull rod, as well as the second linkage structure consisting of the pull rod and the handle mechanism, are all at dead points. At this time, a limit block contacts the first end of the stop block. When the No. 1 and No. 2 pin mechanisms are unlocked, the rocker arm is rotated, and both the first and second linkage structures pass through the dead points. Finally, another limit block contacts the second end of the stop block, and the No. 1 and No. 2 pin mechanisms are unlocked.

2. The door latching mechanism for a manned centrifuge according to claim 1, characterized in that, The handle mechanism also includes a second hinge seat and a spring rod. The second hinge seat is located above the rocker arm and its top is fixedly positioned. The upper end of the spring rod is hinged to the second hinge seat. A connecting part is provided between the second and third ends of the rocker arm. The lower end of the spring rod is hinged to the connecting part. The spring rod is always in a compressed state.

3. The door latching mechanism for a manned centrifuge according to claim 1, characterized in that, Both the No. 1 and No. 2 pin mechanisms also include pin mounting seats. The pin mounting seats and pin seats are spaced apart. The pin mounting seats are fixed in position. The pin mounting seats are provided with mounting holes. The mounting holes are coaxial with the insertion holes. The pins are guided and moved into the mounting holes.

4. A door latching mechanism for a manned centrifuge according to claim 3, characterized in that, Both the No. 1 and No. 2 pin mechanisms also include bushings. The bushings are formed into a circular cylindrical structure and are installed in the mounting hole. The pins are guided and moved within the bushings.

5. A door latching mechanism for a manned centrifuge according to claim 1, characterized in that, Both the No. 1 and No. 2 pin mechanisms also include a pin adjusting rod and a pin locking nut. One end of the pin is first provided with an internal threaded hole, and the outer side wall of the pin adjusting rod is provided with an external thread. The pin locking nut and the pin are both threadedly engaged with the pin adjusting rod. One end face of the pin locking nut is in contact with the end face of the pin. The end of the pin adjusting rod away from the pin is hinged to the second end of the second connecting rod.

6. The door latching mechanism for a manned centrifuge according to claim 1, characterized in that, The tie rod includes a No. 1 connecting joint, a No. 1 locking nut, a hollow connecting rod, a No. 2 locking nut, and a No. 2 connecting joint. The hollow connecting rod has an axially threaded through hole. Both the No. 1 and No. 2 connecting joints have external threads on their outer side walls. The first end of the threaded through hole of the No. 1 locking nut and the hollow connecting rod is threaded into the No. 1 connecting joint. The second end of the threaded through hole of the No. 2 locking nut and the hollow connecting rod is threaded into the No. 2 connecting joint. One end face of the No. 1 locking nut contacts the first end face of the hollow connecting rod, and one end face of the No. 2 locking nut contacts the second end face of the hollow connecting rod.

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