CN113623340B

CN113623340B - Anti-braking force control mechanism on reinforced hydraulic retarder

Info

Publication number: CN113623340B
Application number: CN202110930834.2A
Authority: CN
Inventors: 沈燕红
Original assignee: Shandong Taixin Automobile Technology Co ltd
Current assignee: Shandong Taixin Automobile Technology Co ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-12-13
Anticipated expiration: 2041-08-13
Also published as: CN113623340A

Abstract

The invention relates to a reverse braking force control mechanism on a reinforced hydraulic retarder, and belongs to the technical field of vehicle accessories. The back braking force control mechanism comprises a gear oil pump and an oil path control valve, the gear oil pump comprises an oil pump seat, an oil pump outer ring, an oil pump inner ring and a central positioning shaft, the outer diameter of the oil pump inner ring is smaller than the inner diameter of the oil pump outer ring, the oil pump outer ring and the oil pump outer ring are meshed with each other, the oil path control valve comprises a valve body, a valve core and an air cylinder, the middle of the valve body is a central through hole, the front side end of the valve body is butted with the gear oil pump, the valve core is located in the central through hole and can slide along the axis of the valve core, the front side and the rear side of the outer peripheral surface of the valve body are respectively connected with a rear fixed turbine fixing seat and a rear shell cover of a hydraulic retarder through bolts to form a high-pressure oil chamber and a normal-pressure oil chamber, oil paths for entering and exiting the high-pressure oil chamber and the normal-pressure oil chamber are arranged in the valve body, and the opening and the closing of each oil path are controlled through the movement of the valve core. The anti-braking force control mechanism on the enhanced hydraulic retarder designed by the invention has the advantages of high control precision, safety, reliability and strong applicability.

Description

Anti-braking force control mechanism on reinforced hydraulic retarder

Technical Field

The invention relates to the technical field of vehicle accessories, in particular to a reverse braking force control mechanism on a reinforced hydraulic retarder.

Background

At present, the hydraulic retarder which is marketed and reported publicly in China has the following defects: 1. the oil way control valve only controls the flow direction and the flow of oil, and can not accurately control the volume of oil inlet and oil outlet in the working cavity of the turbine. 2. The counter braking force generated when the retarder works can not be quantitatively controlled. 3. After the retarder is out of operation, much oil still remains in the turbine working cavity, and the retarder still has certain reverse braking power in a non-operating state, so that energy loss is generated for external devices. 4. At the moment when the retarder stops working, the flow speed and the flow of cooling circulating oil are suddenly reduced, the cooling of the internal hot oil is influenced, when the temperature is too high, the high-temperature protection stopping time is too long, and the retarder can not be normally used when the retarder is in a downhill state for a truck provided with the retarder.

Disclosure of Invention

In order to solve the problems in the prior art, the invention designs a control mechanism for enhancing the reverse braking force on the hydraulic retarder, which can accurately control an oil way and control the reverse braking force of the retarder more finely.

The technical scheme adopted by the invention is as follows: the reverse braking force control mechanism comprises a gear oil pump and an oil circuit control valve, the gear oil pump comprises an oil pump seat, an oil pump outer ring, an oil pump inner ring and a central positioning shaft, the outer diameter of the oil pump inner ring is smaller than the inner diameter of the oil pump outer ring, the oil pump inner ring is positioned in the inner ring of the oil pump outer ring, the oil pump inner ring is an external tooth gear ring, the oil pump outer ring is an internal tooth gear ring, the tooth profiles of the oil pump outer ring and the oil pump inner ring are involute tooth profiles which are mutually meshed and are arranged in a pump cavity of the oil pump seat, the oil pump seat is in threaded connection with a rear fixed turbine fixing seat of a hydraulic retarder, the oil circuit control valve comprises a valve body, a valve core and an air cylinder, the middle of the valve body is a central through hole, the valve core is positioned in the central through hole and can slide along the axis of the valve core, the valve core is a piston of the air cylinder, the valve core is pushed to move by the air cylinder, the rear shell covers of the rear fixed turbine fixing seat and the hydraulic retarder are connected to the front side and the rear side of the outer peripheral surface of the valve body through bolts respectively, the rear side end of the air cylinder is connected to the middle of the rear shell cover, the front side end of the air cylinder is connected with the valve body, a high-pressure oil cavity is formed between the front side of the valve body and the rear fixed turbine fixing seat, the middle of the rear fixed turbine fixing seat is provided with an oil flowing hole communicated with the high-pressure oil cavity and a turbine cavity, a normal-pressure oil cavity is formed between the rear side of the valve body and the rear shell cover, an oil path of the high-pressure oil cavity and the normal-pressure oil cavity is arranged inside the valve body and communicated with the normal-pressure oil cavity and the high-pressure oil cavity, the opening and the closing of each oil path are controlled through the movement of the valve core, the front side end of the middle of the valve body is in butt joint with the gear oil pump, and the power is provided for the oil flowing in and out of the normal-pressure oil cavity and the high-pressure oil cavity through the gear oil pump.

Further, the outer fringe of the oil pump seat of gear oil pump is equipped with round thread fixing hole and decides turbine fixing base threaded connection after with, decides the turbine fixing base after and constitutes the front shroud of gear oil pump, the pump chamber comprises the posterior lateral plate of connecting in oil pump seat rear side, oil pump inner circle and oil pump outer lane set up in the pump chamber, the center department of oil pump inner circle is through the concentric cooperation of the centre bore of central positioning axle with the posterior lateral plate of oil pump seat, makes the oil pump inner circle rotatory around the central axis all the time, the center department of oil pump inner circle opens there is waist shape hole, the rotatory shifting head of gear integral key shaft rear end of retarber inserts the block in the waist shape hole of oil pump inner circle from the front side of gear oil pump, and it is rotatory to drive the oil pump inner circle by the rotation of gear integral key shaft, and the mutual meshing of tooth on oil pump inner circle and the oil pump outer lane drives oil pump outer circle and oil pump inner circle synchronous revolution, and the rotational speed of the two is different, the symmetrical division of the posterior lateral plate of pump chamber of gear oil pump chamber has oil inlet port and oil outlet, the trompil position corresponds to the negative pressure cavity region in the pump chamber and pressure chamber respectively.

Furthermore, the inside of the valve body of the oil way control valve is provided with oil ways for feeding and discharging the high-pressure oil cavity and the normal-pressure oil cavity, an oil inlet path and an oil outlet path of the gear oil pump, an oil inlet path and an oil outlet path for cooling circulating oil to flow in and out, and an oil way control valve oil way, the oil inlet path and the oil outlet path of the gear oil pump are respectively provided with openings on the front side end face of the valve body of the oil way control valve, and the oil inlet hole and the oil outlet hole of the gear oil pump are respectively butted with the openings on the front side end face of the valve body of the oil inlet path and the oil outlet path of the gear oil pump.

Furthermore, a valve core return spring is arranged in the oil way control valve, is a pressure spring and is fixed between the valve core and the cylinder, and is made of spring steel.

Furthermore, be provided with oil filter in the ordinary pressure oil pocket, oil filter's filter core main part is the filtration wall that is formed by the compound fibre fold of medium density, and fixed and sealed through the metal cover at both ends forms the oil filter cavity at middle part, it has the internal thread hole to open on the metal cover of oil filter one end, utilizes the screw hole to fix whole filter core on the oil circuit control valve body in the ordinary pressure oil pocket, and gear oil pump during operation, the oil in the ordinary pressure oil pocket gets into inside cavity after the filtration wall filtration of oil filter is clean, later gets into gear oil pump through the inlet port.

Furthermore, a rear shell cover of the hydraulic retarder and a valve body of the oil way control valve are fixedly connected together through a peripheral flange by bolts, a gap at the joint is sealed with the outside by a sealing gasket, and the rear shell cover is formed by casting a metal alloy material.

Compared with the prior art, the improvement of the reverse braking force control mechanism on the reinforced hydraulic retarder is that: the gear oil pump is powered by a gear spline shaft of the connected hydrodynamic retarder, the gear spline shaft is connected with a power shaft gear of the vehicle, and no power mechanism is needed to be arranged additionally, so that energy loss is avoided; the control precision is high, the valve core is pushed by the air cylinder to accurately control the opening and closing of the oil way, the accurate control of the reverse braking force is realized, the generation process of the whole reverse braking force is controllable, and the working safety is high; the reaction torque applied by the product to an external device can reach 6000-8000N.m at most, the downhill speed of the downhill motion device can be effectively controlled, and the product is suitable for carrying tools with various specifications, and has strong applicability and wide application range.

Drawings

FIG. 1 is a schematic view of a tangential structure of a reverse braking force control mechanism on a reinforced hydrodynamic retarder

FIG. 2 is a schematic diagram of a rear view structure of a reverse braking force control mechanism on the enhanced hydrodynamic retarder

FIG. 3 is a schematic sectional view of a gear oil pump

FIG. 4 is a schematic view of a sectional structure of a gear oil pump

FIG. 5 is a schematic rear perspective view of a gear oil pump

FIG. 6 is a front perspective view of a gear oil pump

In the figure, 1 gear oil pump, 2 oil circuit control valve, 3 rear fixed turbine fixing seat, 4 rear shell cover, 5 high pressure oil cavity, 6 normal pressure oil cavity, 11 oil pump seat, 12 pump cavity, 13 oil pump inner ring, 14 oil pump outer ring, 15 center positioning shaft, 16 rear side plate, 17 oil inlet, 18 oil outlet, 21 valve body, 22 valve core, 23 cylinder, 24 valve core reset spring

Detailed Description

The invention is further described with reference to the following figures and specific embodiments. The technical solutions in the embodiments of the present invention are clearly and completely described, and the described embodiments are only some embodiments, but not all embodiments of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1 to 6, the present invention discloses an embodiment of a method for enhancing a control mechanism of a counter braking force on a hydraulic retarder, where the control mechanism of the counter braking force on the hydraulic retarder in this embodiment includes a gear oil pump 1 and an oil passage control valve 2.

The gear oil pump 1 comprises an oil pump seat 11, a pump cavity 12, an oil pump inner ring 13 and an oil pump outer ring 14. The outer edge of the oil pump seat 11 of the gear oil pump 1 is provided with a circle of thread fixing holes, the pump cavity 12 is formed by a rear side plate 16 connected to the rear side end of the oil pump seat 11, and the oil pump inner ring 13 and the oil pump outer ring 14 are arranged in the pump cavity 12. The outer diameter of the oil pump inner ring 13 is smaller than the inner diameter of the oil pump outer ring 14, and the oil pump inner ring 13 is located in the inner ring of the oil pump outer ring 14. The oil pump inner ring 13 is an external gear ring, the oil pump outer ring 14 is an internal gear ring, and the tooth profiles of the oil pump outer ring 13 and the oil pump inner ring 14 are involute tooth profiles which are mutually meshed. The center of the inner oil pump ring 13 is concentrically matched with the center hole of the rear side plate 16 of the pump cavity through a center positioning shaft 15, so that the inner oil pump ring 13 always rotates around the central axis.

The oil pump base 11 is fixedly connected with a rear fixed turbine fixing base 3 of the retarder through a threaded fixing hole in the outer edge of the oil pump base, and the rear fixed turbine fixing base 3 forms a front cover plate of the gear oil pump 1. The center of the rear fixed turbine fixing seat 3 is provided with a through hole which is coaxial with the middle part of the oil pump seat 11.

The center of the oil pump inner ring 13 is provided with a kidney-shaped hole, a rotary shifting head at the rear end of a gear spline shaft of the hydraulic retarder passes through the center through hole of the rear fixed turbine fixing seat 3 backwards and is inserted into and clamped in the kidney-shaped hole of the oil pump inner ring 13 from the front side of the gear oil pump 1, the oil pump inner ring 13 is driven to rotate by the rotation of the gear spline shaft, the teeth on the oil pump inner ring 13 and the oil pump outer ring 14 are meshed with each other to drive the oil pump outer ring 14 and the oil pump inner ring 13 to synchronously rotate, and the rotating speeds of the two are different. An oil inlet hole 17 and an oil outlet hole 18 are symmetrically formed in a rear side plate 16 of a pump cavity 12 of the gear oil pump 1, and the positions of the openings of the oil inlet hole 17 and the oil outlet hole 18 correspond to the circumference of a reference circle where an oil pump inner ring 13 and an oil pump outer ring 14 in the pump cavity 12 are meshed with each other.

The oil path control valve 2 comprises a valve body 21, a valve core 22 and a cylinder 23, wherein the middle part of the valve body 21 is a central through hole, the front side end of the central through hole is communicated with the gear oil pump 1, and the valve core 22 is positioned in the central through hole and can slide along the axis of the central through hole. The valve core 22 is a piston of the cylinder 23, the cylinder 23 pushes the valve core 22 to move, the front side end of the cylinder 23 is fixedly connected with the valve body 21 through a bolt, and the rear side end is connected to the middle of the rear housing cover 4 of the hydrodynamic retarder. The oil path control valve 2 is provided with a spool return spring 24, and the spool return spring 24 is a compression spring fixed between the spool 22 and the cylinder 23 and is made of spring steel. The front side and the rear side of the peripheral surface of the valve body 22 are respectively connected with the rear fixed turbine fixing seat 3 and the rear shell cover 4 of the hydrodynamic retarder through peripheral flanges by bolts, a gap at the joint is sealed with the outside by a sealing gasket, and the rear shell cover 4 and the rear fixed turbine fixing seat 3 are cast and formed by metal alloy materials.

A high-pressure oil cavity 5 is formed between the front side of the valve body 21 and the rear fixed turbine fixing seat 3, and an oil flow hole is formed in the middle of the rear fixed turbine fixing seat 3 and is communicated with the high-pressure oil cavity 5 and a turbine cavity of the hydraulic retarder. A normal pressure oil chamber 6 is formed between the rear side of the valve body 21 and the rear cover 4, oil passages for feeding and discharging the high pressure oil chamber 5 and the normal pressure oil chamber 6, an oil feeding passage and an oil discharging passage of the gear oil pump 1, an oil feeding passage and an oil discharging passage of cooling circulation oil, and an oil passage control valve oil passage are arranged in the valve body 21, and the opening and closing of each oil passage are controlled by the movement of the valve core 33. The front side end of the middle part of the valve body 21 is butted with the gear oil pump 1, the oil inlet path and the oil outlet path of the gear oil pump 1 are respectively provided with an opening on the front side end surface of the valve body 21 of the oil path control valve 2, the oil inlet hole 17 and the oil outlet hole 18 of the gear oil pump 1 are respectively butted with the openings on the front side end surface of the oil inlet path and the oil outlet path of the gear oil pump 1 of the valve body 21, and the gear oil pump 1 provides power for the oil inlet and the oil outlet of the normal-pressure oil chamber 6 and the high-pressure oil chamber 5.

In addition, an oil filter is arranged in the normal-pressure oil cavity 6, a filter element main body of the oil filter is a filter wall formed by folding medium-density composite fibers, the filter element main body is fixed and sealed through metal covers at two ends to form an oil filter cavity in the middle, an internal threaded hole is formed in the metal cover at one end of the oil filter, the whole filter element is fixed on a valve body 21 of the oil path control valve 2 in the normal-pressure oil cavity 6 through a threaded hole, and when the gear oil pump 1 works, oil in the normal-pressure oil cavity 6 enters the internal cavity after being filtered and cleaned through the filter wall of the oil filter and then enters the gear oil pump 1 through the oil inlet hole 17.

After the retarder starts to work, compressed gas is introduced into the air cylinder, the air cylinder works to push the valve core to move forwards to a certain position, the oil path switch entering the high-pressure oil cavity is partially or completely opened, and meanwhile, the oil path switch entering the normal-pressure oil cavity is partially or completely closed. At the moment, the gear oil pump pumps the oil in the normal pressure oil chamber into the oil path control valve through the oil filter, the oil enters the high pressure oil chamber through a channel which is partially or completely opened by the oil path control valve, and meanwhile, the oil which flows back after being cooled by the cooling system also enters the high pressure oil chamber through a channel which is partially or completely opened by the oil path control valve. Under the action of pressure difference, oil entering a high-pressure oil cavity sequentially passes through a long hole in a rear fixed turbine fixing seat and a round hole in the middle of a rear fixed turbine and a middle movable turbine, instantly enters and fills the turbine cavity, the middle turbine in the turbine cavity rotates under the action of external force and relatively rotates with the front fixed turbine and the rear fixed turbine, so that the oil is driven to rotate together and generate reaction power, the reaction power is mainly related to the quantity of the oil entering the turbine cavity, the quantity of the oil entering the turbine cavity is more, the pressure of the oil in the cavity is higher, and the reverse braking force generated and borne by the middle turbine during rotation is higher; conversely, the smaller the amount of oil entering the turbine chamber, the lower the pressure of the oil in the chamber, and the smaller the counter braking force generated and sustained by the intermediate turbine during rotation, until finally eliminated. Therefore, the control of the magnitude of the reverse braking force generated by the intermediate turbine and borne by the intermediate turbine is realized by controlling the amount of oil entering the turbine cavity, namely the high-pressure oil cavity, and the amount is realized by the amount of valve element displacement of the oil way control valve, namely the amount of cylinder piston displacement, and finally the pressure of compressed gas introduced into the cylinder. As long as the pressure of the compressed gas introduced into the cylinder is changed, the counter-braking force applied to the outside and generated by the counter-braking force generating mechanism of the retarder can be changed. After the retarder is released, the air cylinder exhausts air, the valve core resets under the pushing of the valve core reset spring, all oil passages entering the high-pressure oil cavity are closed, all oil passages entering the normal-pressure oil cavity are opened, and simultaneously, the gear oil pump starts to pump oil in the high-pressure oil cavity into the normal-pressure oil cavity, so that only a small part of oil is left in the turbine cavity, and reverse braking force generated by the rotation of the middle turbine disappears.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is defined by the appended claims and the description of the invention.

Claims

1. The anti-braking force control mechanism on the reinforced hydraulic retarder is characterized by comprising a gear oil pump and an oil path control valve, wherein the gear oil pump comprises an oil pump seat, an oil pump outer ring, an oil pump inner ring and a central positioning shaft, the outer diameter of the oil pump inner ring is smaller than the inner diameter of the oil pump outer ring, the oil pump inner ring is positioned in the inner ring of the oil pump outer ring, the oil pump inner ring is an outer tooth gear ring, the oil pump outer ring is an inner tooth gear ring, the tooth profiles of the oil pump outer ring and the oil pump inner ring are involute tooth profiles which are mutually meshed and arranged in a pump cavity of the oil pump seat, and the oil pump seat is in threaded connection with a rear fixed turbine fixing seat of the hydraulic retarder; the oil way control valve comprises a valve body, a valve core and an air cylinder, wherein the middle part of the valve body is a central through hole, the valve core is positioned in the central through hole and can slide along the axis of the valve core, the valve core is a piston of the air cylinder, the air cylinder pushes the valve core to move, the front side and the rear side of the outer peripheral surface of the valve body are respectively connected with a rear fixed turbine fixing seat and a rear shell cover of a hydraulic retarder through bolts, the rear side end of the air cylinder is connected with the middle part of the rear shell cover, the front side end of the valve body is connected with the valve body, a high-pressure oil cavity is formed between the front side of the valve body and the rear fixed turbine fixing seat, an oil flow hole is formed in the middle part of the rear fixed turbine fixing seat and is communicated with a high-pressure oil cavity and a turbine cavity, a normal-pressure oil cavity is formed between the rear side of the valve body and the rear shell cover, oil ways for communicating the normal-pressure oil cavity with the high-pressure oil cavity and the normal-pressure oil cavity are arranged in the valve body, the opening and closing of each oil way are controlled through the movement of the valve core, the gear oil pump, and the gear oil pump provides power for the oil inlet and the normal-outlet of the normal-pressure oil cavity;

the outer fringe of the oil pump seat of gear oil pump is equipped with round thread fixing hole and decides turbine fixing base threaded connection after with, decides the front shroud that the turbine fixing base constitutes the gear oil pump after, the pump chamber comprises the posterior lateral plate of connecting in oil pump seat rear side, oil pump inner circle and oil pump outer lane set up in the pump chamber, the center department of oil pump inner circle is through the concentric cooperation of the centre bore of the posterior lateral plate of central positioning axle with the oil pump seat, makes the oil pump inner circle rotatory around the central axis all the time, the center department of oil pump inner circle opens waist shape hole, the rotatory shifting head of gear spline shaft rear end of hydraulic retarber inserts the block in the waist shape hole of oil pump inner circle from the front side of gear oil pump, and it is rotatory to drive the oil pump inner circle by the rotation of gear spline shaft, and the mutual meshing of the tooth on oil pump inner circle and the oil pump outer circle drives oil pump outer circle and oil pump inner circle synchronous revolution, and the rotational speed of the two is different, the division of symmetry has oil inlet port and oil outlet on the posterior lateral plate of pump chamber of gear oil pump chamber, the trompil position of oil port corresponds to the negative pressure cavity in the pump chamber and pressure boost chamber region respectively.

2. A control mechanism for enhancing the reverse braking force on a hydrodynamic retarder according to claim 1, wherein the oil control valve has an oil passage inside the valve body for entering and exiting the high-pressure oil chamber and the normal-pressure oil chamber, an oil inlet passage and an oil outlet passage of the gear oil pump, an oil inlet passage and an oil outlet passage of the cooling circulation oil inlet and outlet passages, and an oil control valve oil passage, the oil inlet passage and the oil outlet passage of the gear oil pump have openings on the front end face of the valve body of the oil control valve, and the oil inlet hole and the oil outlet hole of the gear oil pump are respectively abutted to the openings on the front end face of the valve body of the oil pump.

3. The mechanism of claim 2, wherein a spool return spring is disposed in the oil control valve, the spool return spring is a compression spring fixed between the spool and the cylinder, and the spool return spring is made of spring steel.

4. A mechanism as claimed in claim 3, wherein the oil filter is disposed in the normal pressure oil chamber, the main body of the filter element of the oil filter is a filter wall formed by folding composite fiber with medium density, and is fixed and sealed by metal covers at both ends to form an oil filter chamber at the middle part, the metal cover at one end of the oil filter is provided with an internal threaded hole, the whole filter element is fixed on the oil path control valve body in the normal pressure oil chamber by the threaded hole, when the gear oil pump works, the oil in the normal pressure oil chamber is filtered and cleaned by the filter wall of the oil filter, and then enters the internal cavity, and then enters the gear oil pump through the oil inlet.

5. A control mechanism for enhancing the reverse braking force on a hydrodynamic retarder according to claim 4, wherein the rear cover of the hydrodynamic retarder is fixed to the valve body of the oil control valve through a peripheral flange by bolts, a gap at the joint is sealed with the outside by a sealing gasket, and the rear cover is cast and molded by a metal alloy material.