Straddle type vehicle with variable valve lift mechanism

Abstract

The utility model relates to a straddle type vehicle with a variable valve lift mechanism. The straddle type vehicle comprises a straddle type vehicle frame and an engine. The engine set is arranged on the straddle type frame and comprises a cylinder head, an oil control valve assembly, a control unit and at least one temperature sensing unit. The oil control valve assembly comprises an oil control valve shell, an oil control valve and an electromagnetic unit. The temperature sensing unit is electrically connected with the control unit and transmits temperature information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the temperature information. Therefore, the time for sending the control instruction can be adjusted by detecting the working temperature of the engine, so that the oil pressure can be established or released at a proper crankshaft angle, the synchronous piston can smoothly slide in the first rocker arm and the second rocker arm, and the action of connecting or separating the first rocker arm and the second rocker arm is completed.

Description

Technical Field

[0001] The utility model relates to a straddle-type vehicle with a variable valve lift mechanism, in particular to a straddle-type vehicle with a variable valve lift mechanism suitable for a two-wheeled motorcycle. Background Art

[0002] See also Figures 1 to 6 , which are respectively a side view of an existing engine with a variable valve lift mechanism, a stereoscopic view of an existing cylinder head, a partial cross-sectional view of an existing cylinder head, a cross-sectional view of an existing intake rocker arm group and a connecting mechanism, a schematic diagram of an oil supply circuit of an existing engine with a variable valve lift mechanism, and a schematic diagram of an oil return circuit of an existing engine with a variable valve lift mechanism. The prior art is an engine 91 with a variable valve lift mechanism as announced in Taiwan Utility Patent Publication No. M628935, which includes a cylinder head 92, an oil control valve assembly 93, and a control unit (not shown). The cylinder head 92 includes a cylinder head body 921 and a camshaft assembly 922, an intake rocker arm group 923, and a valve group 924 contained in a housing space 920 of the cylinder head body 921. The cylinder head body 921 is provided with an oil supply passage 9211, a rocker arm oil passage 9212, and an oil return passage 9213. The intake rocker arm assembly 923 includes a first rocker arm 9231, a second rocker arm 9232 and a connecting mechanism 9233. The rocker arm oil passage 9212 is connected to the connecting mechanism 9233 to connect or separate the first rocker arm 9231 and the second rocker arm 9232. The oil control valve assembly 93 includes an oil control valve housing 931, an oil control valve 932 and an electromagnetic unit 933. When opened, oil can be supplied to the rocker arm oil passage 9212, and when closed, oil can be returned from the rocker arm oil passage 9212 to the cylinder head 92. The control unit is electrically connected to the electromagnetic unit 933 to control the electromagnetic unit 933 to drive the oil control valve 932 to open or close, so that the oil supply passage 9211 is connected or not connected to the rocker arm oil passage 9212, thereby causing the connecting mechanism 9233 to connect or separate the first rocker arm 9231 and the second rocker arm 9232.

[0003] like Figure 4 As shown, the existing connecting mechanism 9233 includes a synchronous piston 9234, a stop piston 9235 and a return spring 9236. The stop piston 9235 can slide in the second rocker arm 9232. The return spring 9236 presses against the stop piston 9235 and the second rocker arm 9232. The rocker arm oil channel 9212 is connected to the synchronous piston 9234. The synchronous piston 9234 is driven by the oil pressure of the rocker arm oil channel 9212 and the stop piston 9235 and can slide in the first rocker arm 9231 and the second rocker arm 9232 to connect or separate the first rocker arm 9231 and the second rocker arm 9232.

[0004] like Figure 5 Please refer to Figure 7 , which is a signal waveform diagram of the existing oil control valve voltage, rocker arm oil channel oil pressure and valve lift. When the control unit issues a control command to open the oil control valve 932, the hydraulic oil in the oil supply channel 9211 begins to be supplied from the oil control valve 932 to the connecting mechanism 9233 through the rocker arm oil channel 9212. At this time, the oil pressure in the rocker arm oil channel 9212 will rise within a build-up time (third time T3+fourth time T4) to a level sufficient to resist the force of the return spring 9236, and push the synchronization piston 9234 to connect the first rocker arm 9231 and the second rocker arm 9232. However, in order for the synchronous piston 9234 to slide smoothly inside the first rocker arm 9231 and the second rocker arm 9232, the control unit must estimate the time to build up the oil pressure when sending the control command so that the oil pressure can be built up at the appropriate crankshaft angle. However, due to changes in the engine operating temperature, the time to build up the oil pressure varies with the temperature and viscosity of the hydraulic oil, making the synchronous piston 9234 unable to slide smoothly inside the first rocker arm 9231 and the second rocker arm 9232 because the oil pressure is built up at an unexpected crankshaft angle.

[0005] like Figure 6 Please refer to Figure 7 , which is a signal waveform diagram of the existing oil control valve voltage, rocker arm oil channel oil pressure and valve lift. When the control unit issues a control command to close the oil control valve 932, the hydraulic oil in the rocker arm oil channel 9212 begins to return to the oil control valve 932, and returns to the cylinder head 92 through the return oil channel 9213. At this time, the oil pressure in the rocker arm oil channel 9212 will be released within a pressure relief time (fifth time T5+sixth time T6), and the return spring 9236 will push the synchronous piston 9234 through the stop piston 9235 to smoothly slide within the first rocker arm 9231 and the second rocker arm 9232. The control unit must estimate the pressure relief time of the oil pressure when sending the control command, so that the oil pressure can be released at the appropriate crankshaft angle. Similarly, due to the change in engine operating temperature, the pressure relief time varies with the temperature and viscosity of the hydraulic oil, causing the synchronous piston 9234 to be unable to slide smoothly in the first rocker arm 9231 and the second rocker arm 9232 due to pressure relief at an unexpected crankshaft angle.

[0006] The inventor, in view of this, based on the spirit of active invention, has been eager to think of a straddle-type vehicle with a variable valve lift mechanism that can solve the above-mentioned problems. After several studies and experiments, the present utility model was finally completed. Summary of the invention

[0007] The main purpose of the utility model is to provide a straddle-type vehicle with a variable valve lift mechanism. By detecting the engine operating temperature, when the control unit sends a control command to open the oil control valve, the time of sending the control command can be adjusted according to the temperature information, so that the oil pressure can be established at an appropriate crankshaft angle, ensuring that the synchronous piston can smoothly slide within the first rocker arm and the second rocker arm, and the action of connecting the first rocker arm and the second rocker arm can be completed. Similarly, when the control unit sends a control command to close the oil control valve, the time of sending the control command can be adjusted according to the temperature information, so that the oil pressure can be released at an appropriate crankshaft angle, ensuring that the synchronous piston can smoothly slide within the first rocker arm and the second rocker arm, and the action of separating the first rocker arm and the second rocker arm can be completed.

[0008] To achieve the above object, the utility model of a straddle-type vehicle with a variable valve lift mechanism includes a straddle-type frame and an engine. The engine assembly is arranged on the straddle-type frame and includes a cylinder head, an oil control valve assembly, a control unit and at least one temperature sensing unit. The cylinder head includes a cylinder head body and a camshaft assembly, an intake rocker arm group and a valve group accommodated in a accommodating space of the cylinder head body. The cylinder head body is provided with an oil supply passage, a rocker arm oil passage and an oil return passage. The intake rocker arm group includes a first rocker arm with a first piston hole, a second rocker arm with a second piston hole and a connecting mechanism. The connecting mechanism includes a synchronous piston, a stop piston and a return spring. The stop piston slides in the second piston hole, and the return spring presses against the stop piston and the second rocker arm. The rocker arm oil passage is connected to the first piston hole. The synchronous piston can slide in the first piston hole and the second piston hole under the oil pressure of the rocker arm oil passage and the drive of the stop piston. The connecting mechanism is used to connect or separate the first rocker arm and the second rocker arm. The oil control valve assembly includes an oil control valve housing, an oil control valve and an electromagnetic unit. The oil control valve housing has a chamber and is provided with an oil inlet hole, an oil outlet hole and an oil return hole. The oil control valve group is arranged in the chamber. The oil supply passage is connected to the oil control valve via the oil inlet hole, the oil outlet hole is connected to the connecting mechanism via the rocker oil passage, and the oil return hole is connected to the oil return passage. The control unit is electrically connected to the electromagnetic unit to control the electromagnetic unit to drive the oil control valve so that the oil supply passage is connected or not connected to the rocker oil passage, so as to cause the connecting mechanism to connect or separate the first rocker arm and the second rocker arm. At least one temperature sensing unit is electrically connected to and transmits a temperature information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the temperature information.

[0009] The at least one temperature sensing unit may be an engine oil temperature sensor. The at least one temperature sensing unit may be an engine cylinder head temperature sensor. The at least one temperature sensing unit may be an engine water temperature sensor. The at least one temperature sensing unit may be an intake air temperature sensor. However, the present invention is not limited thereto, and the temperature sensing unit may be other temperature sensors for measuring other parts of the engine.

[0010] The at least one temperature sensing unit may include an engine water temperature sensor and an intake air temperature sensor, for measuring the engine water temperature and intake air temperature respectively. The at least one temperature sensing unit may include an engine cylinder head temperature sensor and an intake air temperature sensor, for measuring the engine cylinder head temperature and intake air temperature respectively. However, the present invention is not limited thereto, and the temperature sensing unit may include one or more of the above temperature sensors or other temperature sensors.

[0011] The straddle-type vehicle with the variable valve lift mechanism may further include a crank angle sensing unit, wherein the crank angle sensing unit may be electrically connected to and transmit crank angle information to the control unit, so that the control unit may send a control instruction to the electromagnetic unit according to the crank angle information.

[0012] The straddle-type vehicle with a variable valve lift mechanism may further include a crankshaft speed sensing unit, wherein the crankshaft speed sensing unit may be electrically connected to and transmit crankshaft speed information to the control unit, so that the control unit may send a control instruction to the electromagnetic unit according to the crankshaft speed information.

[0013] The straddle-type vehicle with a variable valve lift mechanism may further include a throttle opening sensing unit, wherein the throttle opening sensing unit may be electrically connected to and transmit throttle opening information to the control unit, so that the control unit may send a control instruction to the electromagnetic unit according to the throttle opening information.

[0014] Through the above design, the time when the control unit sends the control command can be adjusted according to the obtained temperature information and the viscosity information of the hydraulic oil that changes with it. The control command can be issued earlier when the engine's operating temperature is lower, or the control command can be issued after a delay when the engine's operating temperature is higher, thereby ensuring that the oil pressure can be established or released at a time point that matches the crankshaft angle. This is actually an optimized design.

[0015] More specifically, when the engine's operating temperature is low, the viscosity of the hydraulic oil is high, so the oil pressure build-up time or pressure relief time is long, and the control unit needs to send a control command early to build up the oil pressure or release the pressure at a time point that matches the crankshaft angle. On the contrary, when the engine's operating temperature is high, the viscosity of the hydraulic oil is low, so the oil pressure build-up time or pressure relief time is short, and the control unit needs to delay sending a control command to build up the oil pressure or release the pressure at a time point that matches the crankshaft angle.

[0016] The above summary and the following detailed description are exemplary in nature and are intended to further illustrate the scope of the patent application of the present utility model. Other purposes and advantages of the present utility model will be described in the subsequent specific implementation methods and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1The figure is a side view of a conventional engine with a variable valve lift mechanism.

[0018] Figure 2 It is a stereogram of an existing cylinder head.

[0019] Figure 3 It is a partial cross-sectional view of an existing cylinder head.

[0020] Figure 4 It is a cross-sectional view of the existing intake rocker arm assembly and connecting mechanism.

[0021] Figure 5 The diagram is a schematic diagram of an oil supply circuit of an existing engine with a variable valve lift mechanism.

[0022] Figure 6 The diagram is a schematic diagram of an oil return circuit of an existing engine with a variable valve lift mechanism.

[0023] Figure 7 It is a signal waveform diagram of the existing oil control valve voltage, rocker arm oil channel oil pressure and valve lift.

[0024] Figure 8 It is a side view of a straddle-type vehicle with a variable valve lift mechanism according to an embodiment of the present invention.

[0025] Fig. 9 The figure is a side view of an engine of a straddle-type vehicle with a variable valve lift mechanism according to an embodiment of the present invention.

[0026] Description of main component symbols:

[0027] 1 Engine

[0028] 2 cylinder head

[0029] 3 Oil control valve assembly

[0030] 4 Temperature sensing unit

[0031] 41Engine water temperature sensor

[0032] 42 Intake air temperature sensor

[0033] 5Throttle opening sensing unit

[0034] 6Control Unit

[0035] 91 Engine

[0036] 92 Cylinder head

[0037] 920 storage space

[0038] 921 cylinder head body

[0039] 9211 oil supply channel

[0040] 9212 rocker oil passage

[0041] 9213 return oil channel

[0042] 922 camshaft assembly

[0043] 923 intake rocker arm assembly

[0044] 9231 first rocker arm

[0045] 9232 second rocker arm

[0046] 9233 connection mechanism

[0047] 9234 Synchronous Piston

[0048] 9235 stop piston

[0049] 9236 return spring

[0050] 924 valve group

[0051] 93 oil control valve assembly

[0052] 931 oil control valve housing

[0053] 932 Oil Control Valve

[0054] 933 electromagnetic unit

[0055] 10 straddle-type vehicles with variable valve lift mechanisms

[0056] T3 Third Time

[0057] T4 Fourth Time

[0058] T5 Fifth Time

[0059] T6 Sixth Time DETAILED DESCRIPTION

[0060] See also Figures 8 to 9 , are a side view of a straddle-type vehicle with a variable valve lift mechanism and a side view of its engine, respectively, according to an embodiment of the present invention. The figure shows a straddle-type vehicle 10 with a variable valve lift mechanism, including a straddle-type frame (not shown) and an engine 1. The engine 1 is assembled on the straddle-type frame and includes a cylinder head 2, an oil control valve assembly 3, a control unit 6, and two temperature sensing units 4. The cylinder head 2, the oil control valve assembly 3, and the control unit 6 are respectively connected to the engine 10. Figures 1 to 6The cylinder head 92, the oil control valve assembly 93 and the control unit of the conventional engine 9 with a variable valve lift mechanism are similar, so their features and functions are not described in detail here. The only difference is that the engine 1 of this embodiment also includes two temperature sensing units 4, namely an engine water temperature sensor 41 and an intake air temperature sensor 42, which are used to measure the engine water temperature and intake air temperature respectively, and are electrically connected to and transmit a temperature information to the control unit 6 respectively, so that the control unit 6 can send a control instruction to the electromagnetic unit according to the temperature information (see Figure 5 933). The temperature sensing unit 4 is not limited to the engine water temperature sensor 41 and the intake air temperature sensor 42 of the present embodiment, and may also be an engine oil temperature sensor (not shown), an engine cylinder head temperature sensor (not shown), at least one of the engine water temperature sensor 41 and the intake air temperature sensor 42. Alternatively, the temperature sensing unit may be other temperature sensors for measuring other parts of the engine. In addition, the straddle-type vehicle 10 with a variable valve lift mechanism of the present embodiment further includes a throttle opening sensing unit 5, wherein the throttle opening sensing unit 5 is electrically connected to and transmits a throttle opening information to the control unit 6, so that the control unit 6 can send a control instruction to the electromagnetic unit according to the throttle opening information.

[0061] Through the above design, the time for the control unit 6 to send the control command can be adjusted according to the obtained water temperature and intake temperature of the engine 1 and the viscosity information of the hydraulic oil that changes therewith. The control command can be issued earlier when the working temperature of the engine 1 is lower, or the control command can be issued after a delay when the working temperature of the engine 1 is higher, thereby ensuring that the oil pressure can be established or released at a time point that matches the crankshaft angle. This is actually an optimized design.

[0062] More specifically, when the operating temperature of the engine 1 is low, the viscosity of the hydraulic oil is high, so the oil pressure build-up time or pressure relief time is long, and the control unit 6 needs to send a control command in advance to build up the oil pressure or release the pressure at a time point that matches the crankshaft angle. On the contrary, when the operating temperature of the engine 1 is high, the viscosity of the hydraulic oil is low, so the oil pressure build-up time or pressure relief time is short, and the control unit 6 needs to delay sending a control command to build up the oil pressure or release the pressure at a time point that matches the crankshaft angle.

[0063] In another embodiment (not shown), the straddle-type vehicle with a variable valve lift mechanism may further include a crankshaft angle sensing unit, wherein the crankshaft angle sensing unit may be electrically connected and transmit crankshaft angle information to the control unit, so that the control unit may send control instructions to the electromagnetic unit based on the crankshaft angle information.

[0064] In another embodiment (not shown), the straddle-type vehicle with a variable valve lift mechanism may also include a crankshaft speed sensing unit, wherein the crankshaft speed sensing unit can be electrically connected and transmit crankshaft speed information to the control unit, so that the control unit can send control instructions to the electromagnetic unit based on the crankshaft speed information.

[0065] The above embodiments are merely examples for the convenience of explanation. The scope of rights claimed by the present utility model shall be based on the scope of protection required by the patent application documents, and is not limited to the above embodiments.

Claims

1. A straddle-type vehicle with a variable valve lift mechanism, characterized in that: The invention comprises a straddle-type frame and an engine, wherein: The engine assembly is mounted on the straddle-type frame and includes: A cylinder head, the cylinder head comprising a cylinder head body and a camshaft assembly, an intake rocker arm group and a valve group accommodated in an accommodation space of the cylinder head body, the cylinder head body is provided with an oil supply passage, a rocker arm oil passage and an oil return passage, the intake rocker arm group comprises a first rocker arm with a first piston hole, a second rocker arm with a second piston hole and a connecting mechanism, the connecting mechanism comprises a synchronous piston, a stop piston and a return spring, the stop piston slides in the second piston hole, the return spring abuts against the stop piston and the second rocker arm, the rocker arm oil passage is connected to the first piston hole, the synchronous piston is driven by the oil pressure of the rocker arm oil passage and the stop piston to slide in the first piston hole and the second piston hole, and the connecting mechanism is used to connect or separate the first rocker arm and the second rocker arm; An oil control valve assembly, comprising an oil control valve housing, an oil control valve and an electromagnetic unit, wherein the oil control valve housing has a chamber and is provided with an oil inlet hole, an oil outlet hole and an oil return hole, the oil control valve assembly is arranged in the chamber, the oil supply passage is connected to the oil control valve via the oil inlet hole, the oil outlet hole is connected to the connecting mechanism via the rocker arm oil passage, and the oil return hole is connected to the oil return passage; a control unit, electrically connected to the electromagnetic unit, for controlling the electromagnetic unit to drive the oil control valve to connect or disconnect the oil supply passage to the rocker arm oil passage, thereby causing the connecting mechanism to connect or disconnect the first rocker arm and the second rocker arm; and At least one temperature sensing unit is electrically connected to and transmits temperature information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the temperature information.

2. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit is an engine oil temperature sensor.

3. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit is an engine cylinder head temperature sensor.

4. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit is an engine water temperature sensor.

5. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit is an intake air temperature sensor.

6. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit includes an engine water temperature sensor and an intake air temperature sensor.

7. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: The at least one temperature sensing unit includes an engine cylinder head temperature sensor and an intake air temperature sensor.

8. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: It also includes a crankshaft angle sensing unit, wherein the crankshaft angle sensing unit is electrically connected to and transmits crankshaft angle information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the crankshaft angle information.

9. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: It also includes a crankshaft speed sensing unit, wherein the crankshaft speed sensing unit is electrically connected to and transmits crankshaft speed information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the crankshaft speed information.

10. The straddle-type vehicle with a variable valve lift mechanism according to claim 1, characterized in that: It also includes a throttle opening sensing unit, wherein the throttle opening sensing unit is electrically connected to and transmits throttle opening information to the control unit, so that the control unit can send a control instruction to the electromagnetic unit according to the throttle opening information.

Images