SE534223C2 - transmission arrangement - Google Patents

Abstract

SUMMARY The invention relates to a transmission device (|; ll) comprising a housing (10) in which a plurality of pairs of interlocking gears (16, 18) forming different gear stages of the transmission device are stored, and partly a direct gear between a input shaft and an output shaft the throttle transmission device, an oil sump (20) being arranged in a lower part of the housing (10), an area of the housing during operation of the gear unit of the transmission device (|; ll) being subjected to oil splashes in the oil (0) in the oil sump (20) immersed lower gears (18) of the gear steps, the oil level (L1, L2) in the oil sump (20) being arranged to be controlled by means of oil level regulating means (100; 200; 300) in the case of direct gear movement (27, 24; 22). . The invention also relates to a motor vehicle. by means of the shifting movement itself (Fig. 3)

Description

534 223 2 when operating with direct gear when the valve unit remains in the open position, or that lubrication and cooling of the loaded gears do not take place when returning from direct gear to switching gear stages due to the valve unit remaining in its closed position so that the oil level is not raised to normal level.

OBJECT OF THE INVENTION An object of the present invention is to provide a transmission device which enables control of the oil level in the oil sump thereof during various operating modes in a robust and reliable manner.

SUMMARY OF THE INVENTION These and other objects, which appear from the following description, are achieved by means of a transmission device and a motor vehicle of the kind initially indicated and further having the features set forth in the characterizing part of appended independent claims 1 and 11. Preferred embodiments of the transmission device are appended dependent claims 2-10.

According to the invention, the objects are achieved with a transmission device comprising a housing in which are stored a number of pairs of interlocking gears which form different gear stages of the transmission device, an oil sump being arranged in a lower part of the housing, an area of the housing the gear stage of the transmission device is subjected to oil splashes by lower gears of the gear stages immersed in the oil in the oil sump, the oil level in the oil sump being arranged to be regulated by means of oil level control means arranged to be formed by means of shift elements.

This enables control of the oil level in the oil sump of the transmission device during different operating modes in a robust and reliable manner. Thus, robust and reliable and without electrical influence the oil level during shifting to operation in different gears can be regulated so that, when operating at gears with low load on gears, the oil level is lower so that lower gears can rotate with less resistance and, where applicable, such as in direct gear operation can rotate substantially contactlessly, and at high load on gears the oil level is higher so that lower gears can splash oil for lubrication and cooling of the loaded gears.

Wd connection of the gear stages from, for example, direct gear or gear stages with low load on gears to gear stages with high load on the gears raises the oil level so that lubrication and cooling of the loaded gears can take place. According to an embodiment of the transmission device, said gear stage comprises a direct gear between an input shaft and an output shaft, said oil level regulating means being arranged to be trained in direct gear movement. As a result, the oil level can be lowered robustly and reliably and without electrical influence during gear shifting to direct gear drive so that during direct gear operation lower gears can rotate substantially contactlessly, and further when connecting the gear steps the oil level is raised so that lubrication and cooling of the loaded gears can take place.

According to an embodiment of the transmission device, said oil level control means comprises a first element arranged at a first shift element.

By arranging an element at a shift element which moves during shifting movement, it is possible to direct and / or collect oil during, for example, direct shift operation.

According to an embodiment of the transmission device, said oil level control means comprises a second element arranged to together with said first element form said oil level control means. As a result, the first and second elements in, for example, the direct gear movement can form a composite element which, in direct gear operation, directs and / or collects the oil, the oil level falling so that lower gears can rotate substantially contactlessly.

According to an embodiment of the transmission device, said second element is arranged at a second shift element. Hereby said oil level regulating means is provided by the shift elements and consequently the first and second elements both moving relative to each other during the shifting movement so that the oil level is lowered when direct gear is engaged. This entails simple training of routing elements of the two elements by utilizing shift elements which, for example in the direct-exchange movement for direct gear connection, move closer to each other.

According to an embodiment of the transmission device, said second element is fixedly arranged in the housing. Hereby said oil level regulating means is provided in that the element arranged at the shift element moves relative to the fixed element.

Hereby an element can for instance be arranged fixedly in the transmission housing, the first element connected to the shift element during, for example, direct gear movement to direct gear operation moving relative to the fixed element so that an oil level regulating means is formed for directing and / or collecting oil so that the oil level drops. In this case, fewer moving elements are obtained.

According to an embodiment of the transmission device, said oil level regulating means is arranged to form a collecting device. This does not require a separate collection tank to which the oil is led, which enables a more compact solution in that the trained collection container is located in the transmission housing. 534 223 4 According to an embodiment of the transmission device, said oil level regulating means is arranged to form a routing device. In this way, the oil can be routed away during direct gear operation, for example, so that the oil level drops during the transition to direct gear operation.

According to an embodiment of the transmission device, an oil collection tank is connected to the housing, which tank has an upper oil intake at the area of the housing which during operation of the transmission device gear stage is exposed to oil splashes of lower gears immersed in the oil in the oil sump and a lower outlet for return of oil collected in the tank to the oil sump, said oil level regulating means being arranged to direct the oil to said upper oil intake.

This enables an efficient way to divert the oil during direct gear operation.

According to an embodiment of the transmission device, said oil inlet, outlet and oil level regulating means are adapted so that the output capacity of the oil through the outlet in direct gear operation is lower than the input capacity of the oil through the oil intake. As a result, no openable closure of the outlet such as a valve or the like is required.

DESCRIPTION OF THE DRAWINGS The present invention will be better understood with reference to the following detailed description read in conjunction with the accompanying drawings, in which like reference numerals refer to like parts throughout the many views, and in which: Fig. 1 schematically shows a side view of a motor vehicle; F ig. 2 schematically shows a cross-sectional view through a transmission device according to an embodiment of the invention in a static rest position; Fig. 3 schematically shows the transmission device in fi g. 2 at just engaged direct transmission; Fig. 4 schematically shows the transmission device in fi g. 2 in a subsequent operating mode, when the oil level is lowered in the oil sump of the transmission device.

Fig. 5 schematically shows a cross-sectional view through a transmission device according to an embodiment of the present invention.

Fig. 6a schematically shows a plan view of an oil level control means of the transmission device according to the embodiments in fi g. 2-4 in an inactive position and fi g. 6b is a section A-A of the oil level regulator in fi g. Ga; Fig. 7a schematically shows a plan view of the oil level control means in fi g. 6a-b in an active position and fi g. 7b is a section A-A of the oil level regulator in fi g. 7a; Fig. 8a schematically shows a plan view of an oil level control means of the transmission device according to the embodiments in fi g. 5 in an inactive position and fi g. 8b shows a section B-B of the oil level regulator in fi g. 8a; Fig. 9a schematically shows a plan view of the oil level control means in fi g. 8a-b in an active position and fi g. 9b shows a section B-B of the oil level regulator in fi g. 9a; Fig. 10a schematically shows a plan view of an oil level control means according to an embodiment of the present invention in an inactive position and fi g. 10b is a section C-C of the oil level regulator in fi g. 10a; and Fig. 11a schematically shows a plan view of the oil level control means in fi g. 10a-b in an active position and fi g. 11b is a section C-C of the oil level regulator in fi g. 11a.

DESCRIPTION OF EMBODIMENTS Referring to Figure 1, a side view of a motor vehicle 1 is shown. The exemplary vehicle 1 consists of a tractor 2 and a trailer 3. The vehicle may be a heavy vehicle, such as a truck or a bus. The vehicle can alternatively be a car.

The vehicle 1 comprises a transmission device according to one of the embodiments below.

Figs. 2-4 schematically show a cross-sectional view through a transmission device 1 in different positions according to a first embodiment of the present invention and fi g. 5 schematically shows a cross-sectional view through a transmission device 11 according to a second embodiment of the present invention.

Fig. 2 schematically shows the transmission device I in a static rest position, fi g. 3 at just engaged direct gear and fi g. 4 in a subsequent direct gear operating mode, when the oil level is lowered in the oil sump of the transmission device 1.

The transmission device 1; 11 according to the present invention comprises a housing 10 in which two parallel gear bearing shafts 12, 14, an upper main shaft 12 and a lower side shaft 14, are rotatably mounted. The main shaft 12 is interconnectable with input and output shafts (not shown) at the transmission device I; ll ends. A number of gears for different gear stages of the transmission device are mounted on the main shaft, of which one gear 16 is shown, which is arranged to engage with associated gear gears mounted on the side shaft 14, of which one gear 18 is shown. The pair of gears 16, 18 shown in Figures 2-5 form one of several gear stages of the transmission device I; ll. 534 223 6 Transmission device I; 11 comprises an oil sump 20 arranged in the bottom part of the housing 10, the lower gears 18 being arranged to be kept immersed a few centimeters in oil 0 in the oil sump in order to lubricate and cool the gears of all gear stages during operation.

The transmission device also comprises shift elements such as shift forks, of which a shift element 22 is shown. Shift gears of shift elements are arranged to move coupling sleeves (not shown) back and forth during a shifting movement so that different gears are engaged. The shift elements 22 are consequently arranged to engage gears for the requested shifting step in engagement with each other, when a shifting movement is performed. When coupling and uncoupling the direct gear, a direct gear movement takes place, whereby shift elements 22 are arranged to move coupling sleeves back and forth so that the input shaft and main shaft 12 of the transmission device are coupled and disengaged.

By shifting element here is meant any part of the transmission device which moves with the shifting movement at different gearing stages such as direct gearing stages. Shift elements consequently include shift fork / shift fork, control shaft which is connected to shift gears which are arranged to actuate the shift fork, shift pins, etc.

In order to significantly reduce the splashing losses that occur even when the immersed gears rotate in direct gear operation when the power is transmitted directly between the input and output shafts with a gear ratio of 1: 1 and the rotating gears in the gear stages are consequently not loaded, thus lubrication and cooling are required. , the transmission device according to the present invention comprises oil level control means 100; 200; 300, see for example fi g. 2-5, 6a-1 1 b.

The oil level of the oil sump 20 is arranged to be controlled by said oil level regulating means 100 during direct gear movement; 200; 300 arranged to be formed by means of shift elements 22 moving in the direct gear movement so that, when the direct gear is engaged, the normal level L1 of the oil in the oil sump 20 is lowered to a level L2 at which the lower side shaft gears 18 can rotate substantially contactless with the oil in the sump. the oil level is reset to the normal level L2 as soon as one of the gear stages is engaged.

The transmission device I according to the embodiment in fi g. 2-4 comprise an oil collection tank 30 connected to the transmission housing 10, which tank has partly an upper oil inlet 32 at the area of the housing which during operation of the transmission stage 1 is exposed to oil splashes by the oil 0 oil sump 20 immersed lower gears 18 of the gear stages and partly a lower outlet 34 for returning the oil 0 collected to the tank to the oil sump 20, said oil level regulating means 100 being arranged to direct the oil 0 to said upper oil inlet 32 during direct gear operation. Figs. 6a and 6b schematically show a plan view and a section A-A, respectively, of the oil level control means 100 of the transmission device I according to the first embodiment in fi g. 2-4 where the direct gear is disengaged and fi g. 7a and 7b schematically show a plan view and a section A-A, respectively, of the oil level control means in fi g. 6a-b in direct gear operation, ie. with the direct gear engaged so that the input shaft and main shaft 12 are connected.

The oil level control means 100 of the transmission device according to the first embodiment comprises a first element 110 arranged at a first shift element 22 and a second element 112 arranged at a second shift element 24.

The second element 112 is arranged to together with said first element 110 form said oil level regulating means 100. The first element 110 is connected to the first shift element 22 via a joint 110a and the second element 112 is connected to the second shift element 24 via a joint and the elements are arranged so that in the event of a direct gear movement, i.e. during connection of direct gear, by means of the movement of the shaft elements they move towards each other so that they form a routing device 120 arranged relative to the upper oil intake so that oil is routed through the oil intake into the oil collection tank.

The lower gears 18 are used here as impellers to surface oil 0 from the oil sump 20 up to the adjacent oil collection tank 30, the oil inlet opening 32 of which is located on the wall 11 which is most exposed to the oil splash during the rotation of the gears 18 in it. 3 showed the direction. Respective elements are preferably designed with such a curvature that when they are brought together in direct gear operation, the routing of the oil 0 into the oil collection tank is significantly improved.

Said oil inlet 32, outlet 34 and first and second elements 110, 112 for directing the oil in direct gear operation are adapted so that in direct gear operation, when the first and second elements 110, 112 form a directing device 120, the output capacity of the oil through the outlet 34 being lower than in fl the capacity of the oil through the oil inlet 32 so that the oil level in the oil sump drops to the level where the lower gears can rotate substantially non-contact.

As soon as any of the shifting steps are engaged, the first element 110 is arranged together with the second element 112 so that they move by means of the movement of the shift elements 22, 24 away from each other so that a space is formed between them so that the oil is not directed into the oil collection tank 30. that the output capacity through the outlet 34 is higher than the input capacity of the oil O through the oil inlet 32 so that the oil level in the oil sump 20 rises to the level L2 where the lower gears 18 upon rotation can produce oil splashes for lubrication and cooling of the loaded gears. Fig. 5 schematically shows a cross-sectional view through a transmission device 11 according to a second embodiment of the invention. The transmission device according to the second embodiment differs from the embodiment according to the first embodiment, inter alia in that it does not have an adjacent oil collection tank.

Figs. 8a and 8b schematically show a plan view and a section B-B, respectively, of the oil level control means 200 of the transmission device 11 according to the second embodiment in fi g. 5 where the direct gear is disengaged and fi g. 9a and 9b schematically show a plan view and a section B-B, respectively, of the oil level control means 200 in fi g. 8a-b in direct gear operation, ie. with the direct gear engaged so that the input shaft and main shaft 12 are connected.

The oil level control means 200 of the transmission device 11 according to the second embodiment illustrated in fi g. 5 and 8a-b, 9a-b, comprises a first element 210 arranged at a first shift element 22 and a second element arranged 212 at a second shift element 24.

The second element 212 is arranged to together with said first element 210 form said oil level regulating means 200. The first element 210 is connected to the first slide element 22 via a joint 210a and the second element 212 is connected to the second shift element 24 via a joint 212a and the elements 21, 212 are arranged so that in a direct shifting movement, i.e. during the engagement of the direct gear, by means of the movement of the shift elements 22, 24 they move towards each other so that they form a collecting device 220 arranged so that oil which splashes on rotation is collected in the formed collecting device 220.

As soon as any of the shifting steps is engaged, the first element 210 is arranged together with the second element 212 so that they move by means of the movement of the shift elements 22, 24 away from each other, a space being formed between them so that the oil 0 collected by the elements 210, 212 flows back down the oil sump 20 and so that no oil is collected by the elements 210, 212 so that so that the oil O flows back into the oil sump 20 so that the oil level in the oil sump rises to the level L2 where the lower gears upon rotation can produce oil splashes for lubrication and cooling of the oil sump. loaded gears.

Figs. 10a and 10b schematically show a plan view and a section C-C, respectively, of the oil level control means 300 of the transmission device according to a third embodiment of the present invention where the direct gear is disengaged and fi g. 11a and 11b schematically show a plan view and a section C-C, respectively, of the oil level control means 300 in fi g. 10a-b in direct gear operation, ie. with the direct gear engaged so that the input shaft and main shaft 12 are connected.

The oil level control means 300 of the transmission device according to the third embodiment illustrated in fi g. 10a-b, 11a-b, comprises a first element 310 534 223 9 arranged at a first shift element 22 and a second element 312 fixedly arranged in the transmission housing 10, for example at the wall or other fixed part of the transmission housing 10.

The second element 312 is arranged to together with said first element 310 form said oil level regulating means 300. The first element 310 is connected to the first shift element 22 via a joint 310a and the second element 312 is fixedly connected in the housing via a joint 312a so that it the first element 310 in the case of a direct gear movement, i.e. during engagement of direct gear, by means of the movement of the first shift element 22 moves towards the fixed second element 312 so that together they form a routing device 320 arranged so that oil is routed. According to a variant, the oil is arranged to be directed by oil intake into an oil collection tank, for example according to fi g. 2-4.

Alternatively, in a direct gear movement, the first element 310 together with the fixed second element 312 would be configured to form a collection device arranged to collect oil, in accordance with the function described with reference to fi g. 5, 8a-b, 9a-b.

As soon as any of the shifting steps are engaged, the oil level in the oil sump rises to level L2 where the lower gears upon rotation can produce oil splashes for lubrication and cooling of the loaded gears in accordance with either the embodiment according to fi g. 2-4, 6a-b, 7a-b, i.e. the routing device, or in accordance with the embodiment of Figs. 5, 8a-b, 9a-b.

The above has various embodiments of oil level regulators 100; 200; 300 described.

The very idea of invention is to regulate the oil level in the oil sump during direct change movement by means of oil level control means which are arranged to be trained by means of shift elements moving during the changeover movement. Accordingly, any suitable oil level control means where the shifting motion is utilized can be used.

According to a variant, a single element could be arranged on a shift element so that during direct gear movement to direct gear operation they are actuated so that it forms a routing device arranged to direct the oil, for example into a collection tank or so that it forms a collection device which collects the oil. This can be achieved, for example, by the element rotating during said shifting movement between an oil-directing / oil-collecting position during direct gear operation and a passive position during other operation.

According to another variant, the first and second elements could form a collecting device during gear operation, in which oil is thus filled at all times when the lower gears rotate and thus overflows so that the oil level is maintained so that lubrication and cooling of the loaded gears takes place. The first and second elements would further be arranged so that during direct exchange movement they are actuated so as to form a routing device by forming an opening in the collecting device during the exchange movement through which opening the oil is led away via for instance a channel to e.g. a separate collection tank according to fi g. 2-4, so that oil filled in the collecting device is continuously diverted so that the oil level drops so that the lower unloaded gears can rotate substantially contactlessly.

The oil level control means according to embodiments of the present invention may be connected to shift elements in any suitable manner and be spatially arranged at any suitable location in the housing of the transmission device according to embodiments of the present invention.

The transmission device with direct gear has been described above in connection with fi gures.

However, any transmission device can be used to control the oil level in the oil sump based on the shifting movement, the oil level regulating means being arranged to be trained in the shifting motion.

According to an embodiment of the present invention, the oil level regulating means is arranged at a shift element such that collection and / or directing of the oil takes place based on gear steps so that the oil level is regulated based on the load on the gears.

Consequently, in gear stages where the load on the gears is low, the oil level regulator is arranged to be trained during the gear movement so that the oil level is significantly reduced so that only the oil required for lubrication and cooling of the slightly loaded gears is splashed by lower gears. In gear stages where the load on the gears is high, the oil level regulator is arranged to be trained during the gear movement so that the oil level is substantially maintained so that the required oil for lubrication and cooling of the heavily loaded gears is splashed by means of lower gears. In the transmission device with direct gear stages, as described above, the oil level regulating means is arranged to be trained during the gear movement so that the oil level is reduced so that substantially no oil for lubrication and cooling of the substantially unloaded gears is splashed by means of lower gears.

In this case, the oil level regulating means may comprise anslut your elements arranged in connection with different shift elements to be affected differently by shifting movements for coupling different gear stages so that the oil level regulator is based on the shifting motion so that gear stages with high load on gears cause low gear oil level.

The above description of the preferred embodiments of the present invention has been provided for illustrative and descriptive purposes. It is not intended to be exhaustive or to limit the scope to the variants described. Obviously, many modifications and variations will occur to those skilled in the art.

The embodiments have been selected and described to best explain the principles of the invention and its practical applications, thereby enabling one skilled in the art to understand the invention for various embodiments and with the various modifications suitable for the intended use.

Claims (11)

534 223 lay. PATENT REQUIREMENTS A transmission device (|; 11) comprising a housing (10) in which a plurality of pairs of interlocking gears (16, 18) are formed which form different gear stages of the transmission device, an oil sump (20) being arranged in a lower part of the housing (10), wherein an area of the housing during operation of the transmission stage of the transmission device (|; ll) is subjected to oil splashes by lower gears (18) of the gear stages immersed in the oil (0) in the oil sump (20), characterized in that the oil level (L1 , L2) in the oil sump (20) is arranged to be controlled during shifting by means of oil level regulating means (100; 200; 300) which oil level regulating means is arranged at a shift element (22, 24; 22) which moves during shifting movement and thereby directs and / or collects oil . The transmission device according to claim 1, wherein said gear step comprises a direct gear between an input shaft and an output shaft, said oil level regulating means (100; 200; 300) being arranged to be trained in direct gear movement. A transmission device according to claim 1 or 2, wherein said oil level control means (100; 200; 300) comprises a first element (110; 210; 310) arranged at a first shift element (22). The transmission device according to claim 3, wherein said oil level control means (100; 200; 300) comprises a second element (112; 212; 312) arranged to together with said first element (100; 200; 300) form said oil level control means (100; 200; 300). The transmission device according to claim 4, wherein said second element (112; 212) is arranged at the second shift element (24). Transmission device according to claim 4, wherein said second element (312) is fixedly arranged in the housing (10). A transmission device according to any one of the preceding claims, wherein said oil level control means (200) is arranged to form an oil collection device (220). A transmission device according to any one of the preceding claims, wherein said oil level control means (100; 300) is arranged to form an oil routing device (120; 320). Transmission device according to one of the preceding claims, wherein an oil collection tank (30) is connected to the housing (10), which tank has an upper oil inlet (32) at the area of the housing which during operation of the transmission device gear stage is exposed to oil splashes in the oil. (O) immersed in the oil sump (20) lower gears (18) of the gear steps and on the other hand a lower outlet (34) for returning oil (O) collected in the tank to the oil sump (20), said oil level regulating means (100; 300) being arranged directing the oil to said upper oil inlet (32). 534 223 15 Transmission device according to claim 9, wherein said oil inlet (32), outlet (34) and oil level regulating means (100; 300) are adapted so that in direct gear operation the outflow capacity of the oil (0) through the outlet (34) is lower than the inlet capacity of the oil (0). ) through the oil intake (32). Motor vehicle comprising a transmission device according to any one of the preceding claims.